1

LT1352/LT1353

13523fa

TYPICAL APPLICATIO

U

APPLICATIO SU

DESCRIPTIO

U

FEATURES

Dual and Quad250µA, 3MHz, 200V/µs

Operational Amplifiers

3MHz Gain Bandwidth 200V/µs Slew Rate 250µA Supply Current per Amplifier C-LoadTM Op Amp Drives All Capacitive Loads Unity-Gain Stable Maximum Input Offset Voltage: 600µV Maximum Input Bias Current: 50nA Maximum Input Offset Current: 15nA Minimum DC Gain, RL = 2k: 30V/mV Input Noise Voltage: 14nV/√Hz Settling Time to 0.1%, 10V Step: 700ns Settling Time to 0.01%, 10V Step: 1.25µs Minimum Output Swing into 1k: ±13V Minimum Output Swing into 500Ω: ±3.4V Specified at ±2.5V, ±5V and ±15V

Battery-Powered Systems Wideband Amplifiers Buffers Active Filters Data Acquisition Systems Photodiode Amplifiers

The LT®1352/LT1353 are dual and quad, very low power,high speed operational amplifiers with outstanding ACand DC performance. The amplifiers feature much lowersupply current and higher slew rate than devices withcomparable bandwidth. The circuit combines the slewingperformance of a current feedback amplifier in a trueoperational amplifier with matched high impedanceinputs. The high slew rate ensures that the large-signalbandwidth is not degraded. Each output is capable ofdriving a 1kΩ load to ±13V with ±15V supplies and a 500Ωload to ±3.4V on ±5V supplies.

The LT1352/LT1353 are members of a family of fast, highperformance amplifiers using this unique topology andemploying Linear Technology Corporation’s advancedcomplementary bipolar processing. For higher bandwidthdevices with higher supply current see the LT1354 throughLT1365 data sheets. Bandwidths of 12MHz, 25MHz, 50MHzand 70MHz are available with 1mA, 2mA, 4mA and 6mA ofsupply current per amplifier. Singles, duals and quads ofeach amplifier are available. The LT1352 is available in an8-lead SO package. The LT1353 is offered in a 14-leadnarrow surface mount package.

C-Load is a trademark of Linear Technology Corporation., LTC and LT are registered trademarks of Linear Technology Corporation.

Instrumentation Amplifier Large-Signal Response

AV = –1 1352/53 TA02

+

–

GAIN = [R4/R3][1 + (1/2)(R2/R1 + R3/R4) + (R2 + R3)/R5] = 102TRIM R5 FOR GAINTRIM R1 FOR COMMON MODE REJECTIONBW = 30kHz

–

+

1/2LT1352 –

+

1/2LT1352

R150k

R25k

R51.1k

R35k

R450k

VIN

VOUT

1352/53 TA01

Available in SO-8 Package LT1353 in Narrow Surface Mount Package

2

LT1352/LT1353

13523fa

Consult LTC Marketing for parts specified with wider operating temperature ranges.

SYMBOL PARAMETER CONDITIONS VSUPPLY MIN TYP MAX UNITS

VOS Input Offset Voltage ±15V 0.2 0.6 mV±5V 0.2 0.6 mV

±2.5V 0.3 0.8 mV

IOS Input Offset Current ±2.5V to ±15V 5 15 nA

IB Input Bias Current ±2.5V to ±15V 20 50 nA

en Input Noise Voltage f = 10kHz ±2.5V to ±15V 14 nV/√Hz

in Input Noise Current f = 10kHz ±2.5V to ±15V 0.5 pA/√Hz

RIN Input Resistance VCM = ±12V ±15V 300 600 MΩDifferential ±15V 20 MΩ

CIN Input Capacitance ±15V 3 pF

Positive Input Voltage Range ±15V 12.0 13.5 V±5V 2.5 3.5 V

±2.5V 0.5 1.0 V

Negative Input Voltage Range ±15V –13.5 –12.0 V±5V –3.5 – 2.5 V

±2.5V –1.0 – 0.5 V

CMRR Common Mode Rejection Ratio VCM = ±12V ±15V 80 94 dBVCM = ±2.5V ±5V 78 86 dBVCM = ±0.5V ±2.5V 68 77 dB

PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V 90 106 dB

ABSOLUTE MAXIMUM RATINGS

W WW U

Total Supply Voltage (V + to V –) .............................. 36VDifferential Input Voltage (Transient Only, Note 2) ±10VInput Voltage .......................................................... ±VSOutput Short-Circuit Duration (Note 3) ........... IndefiniteOperating Temperature Range ................ –40°C to 85°C

Specified Temperature Range (Note 7) .. –40°C to 85°CMaximum Junction Temperature (See Below)

Plastic Package ............................................... 150°CStorage Temperature Range ................. –65°C to 150°CLead Temperature (Soldering, 10 sec).................. 300°C

ELECTRICAL CHARACTERISTICS TA = 25°C, VCM = 0V unless otherwise noted

PACKAGE/ORDER INFORMATION

W UU

ORDER PARTNUMBER

ORDER PARTNUMBER

LT1352CN8LT1352CS8LT1352IN8LT1352IS8

LT1353CS

TOP VIEW

S PACKAGE14-LEAD PLASTIC SO

1

2

3

4

5

6

7

14

13

12

11

10

9

8

OUT A

–IN A

+IN A

V+

+IN B

–IN B

OUT B

OUT D

–IN D

+IN D

V–

+IN C

–IN C

OUT C

CB

DA

TJMAX = 150°C, θJA = 150°C/ W

S8 PART MARKING

13521352I

1

2

3

4

8

7

6

5

TOP VIEW

OUT A

–IN A

+IN A

V–

V+

OUT B

–IN B

+IN B

N8 PACKAGE8-LEAD PDIP

S8 PACKAGE8-LEAD PLASTIC SO

B

A

TJMAX = 150°C, θJA = 130°C/ W (N8)TJMAX = 150°C, θJA = 190°C/ W (S8)

(Note 1)

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LT1352/LT1353

13523fa

SYMBOL PARAMETER CONDITIONS VSUPPLY MIN TYP MAX UNITS

AVOL Large-Signal Voltage Gain VOUT = ±12V, RL = 5k ±15V 40 80 V/mVVOUT = ±10V, RL = 2k ±15V 30 60 V/mVVOUT = ±10V, RL = 1k ±15V 20 40 V/mVVOUT = ±2.5V, RL = 5k ±5V 30 60 V/mVVOUT = ±2 .5V, RL = 2k ±5V 25 50 V/mVVOUT = ±2.5V, RL = 1k ±5V 15 30 V/mVVOUT = ±1V, RL = 5k ±2.5V 20 40 V/mV

VOUT Output Swing RL = 5k, VIN = ±10mV ±15V 13.5 14.0 ±VRL = 2k, VIN = ±10mV ±15V 13.4 13.8 ±VRL = 1k, VIN = ±10mV ±15V 13.0 13.4 ±VRL = 1k, VIN = ±10mV ±5V 3.5 4.0 ±VRL= 500Ω, VIN = ±10mV ±5V 3.4 3.8 ±VRL = 5k, VIN = ±10mV ±2.5V 1.3 1.7 ±V

IOUT Output Current VOUT = ±13V ±15V 13.0 13.4 mAVOUT = ±3.4V ±5V 6.8 7.6 mA

ISC Short-Circuit Current VOUT = 0V, VIN = ±3V ±15V 30 45 mA

SR Slew Rate AV = –1, RL = 5k (Note 4) ±15V 120 200 V/µs±5V 30 50 V/µs

Full-Power Bandwidth 10V Peak (Note 5) ±15V 3.2 MHz3V Peak (Note 5) ±5V 2.6 MHz

GBW Gain Bandwidth f = 200kHz, RL = 10k ±15V 2.0 3.0 MHz± 5V 1.8 2.7 MHz

± 2.5V 2.5 MHz

tr, tf Rise Time, Fall Time AV = 1, 10% to 90%, 0.1V ±15V 46 ns±5V 53 ns

Overshoot AV = 1, 0.1V ±15V 13 %±5V 16 %

Propagation Delay 50% VIN to 50% VOUT, 0.1V ±15V 41 ns±5V 52 ns

ts Settling Time 10V Step, 0.1%, AV = –1 ±15V 700 ns10V Step, 0.01%, AV = –1 ±15V 1250 ns5V Step, 0.1%, AV = –1 ±5V 950 ns5V Step, 0.01%, AV = –1 ±5V 1400 ns

RO Output Resistance AV = 1, f = 20kHz ±15V 1.5 ΩChannel Separation VOUT = ±10V, RL = 2k ±15V 101 120 dB

IS Supply Current Each Amplifier ±15V 250 320 µAEach Amplifier ±5V 230 300 µA

ELECTRICAL CHARACTERISTICS TA = 25°C, VCM = 0V unless otherwise noted

SYMBOL PARAMETER CONDITIONS VSUPPLY MIN TYP MAX UNITS

VOS Input Offset Voltage ±15V 0.8 mV±5V 0.8 mV

±2.5V 1.0 mV

Input VOS Drift (Note 6) ±2.5V to ±15V 3 8 µV/°C

IOS Input Offset Current ±2.5V to ±15V 20 nA

IB Input Bias Current ±2.5V to ±15V 75 nA

0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted

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LT1352/LT1353

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0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted

SYMBOL PARAMETER CONDITIONS VSUPPLY MIN TYP MAX UNITS

CMRR Common Mode Rejection Ratio VCM = ±12V ±15V 78 dBVCM = ±2.5V ±5V 77 dBVCM = ±0.5V ±2.5V 67 dB

PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V 89 dB

AVOL Large-Signal Voltage Gain VOUT = ±12V, RL = 5k ±15V 25 V/mVVOUT = ±10V, RL = 2k ±15V 20 V/mVVOUT = ±2.5V, RL = 5k ±5V 20 V/mVVOUT = ±2 .5V, RL = 2k ±5V 15 V/mVVOUT = ±2.5V, RL = 1k ±5V 10 V/mVVOUT = ±1V, RL = 5k ±2.5V 15 V/mV

VOUT Output Swing RL = 5k, VIN = ±10mV ±15V 13.4 ±VRL = 2k, VIN = ±10mV ±15V 13.3 ±VRL = 1k, VIN = ±10mV ±15V 12.0 ±VRL = 1k, VIN = ±10mV ±5V 3.4 ±VRL= 500Ω, VIN = ±10mV ±5V 3.3 ±VRL = 5k, VIN = ±10mV ±2.5V 1.2 ±V

IOUT Output Current VOUT = ±12V ±15V 12.0 mAVOUT = ±3.3V ±5V 6.6 mA

ISC Short-Circuit Current VOUT = 0V, VIN = ±3V ±15V 24 mA

SR Slew Rate AV = –1, RL = 5k (Note 4) ±15V 100 V/µs±5V 21 V/µs

GBW Gain Bandwidth f = 200kHz, RL = 10k ±15V 1.8 MHz± 5V 1.6 MHz

Channel Separation VOUT = ±10V, RL = 2k ±15V 100 dB

IS Supply Current Each Amplifier ±15V 350 µAEach Amplifier ±5V 330 µA

ELECTRICAL CHARACTERISTICS

–40°C ≤ TA ≤ 85°C, VCM = 0V unless otherwise noted (Note 7)

SYMBOL PARAMETER CONDITIONS VSUPPLY MIN TYP MAX UNITS

VOS Input Offset Voltage ±15V 1.0 mV±5V 1.0 mV

±2.5V 1.2 mV

Input VOS Drift (Note 6) ±2.5V to ±15V 3 8 µV/°C

IOS Input Offset Current ±2.5V to ±15V 50 nA

IB Input Bias Current ±2.5V to ±15V 100 nA

CMRR Common Mode Rejection Ratio VCM = ±12V ±15V 76 dBVCM = ±2.5V ±5V 76 dBVCM = ±0.5V ±2.5V 66 dB

PSRR Power Supply Rejection Ratio VS = ±2.5V to ±15V 87 dB

AVOL Large-Signal Voltage Gain VOUT = ±12V, RL = 5k ±15V 20 V/mVVOUT = ±10V, RL = 2k ±15V 15 V/mVVOUT = ±2.5V, RL = 5k ±5V 15 V/mVVOUT = ±2 .5V, RL = 2k ±5V 10 V/mVVOUT = ±2.5V, RL = 1k ±5V 8 V/mVVOUT = ±1V, RL = 5k ±2.5V 10 V/mV

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LT1352/LT1353

13523fa

ELECTRICAL CHARACTERISTICS – 40°C ≤ TA ≤ 85°C, VCM = 0V unless otherwise noted (Note 7)

SYMBOL PARAMETER CONDITIONS VSUPPLY MIN TYP MAX UNITS

VOUT Output Swing RL = 5k, VIN = ±10mV ±15V 13.3 ±VRL = 2k, VIN = ±10mV ±15V 13.2 ±VRL = 1k, VIN = ±10mV ±15V 10.0 ±VRL = 1k, VIN = ±10mV ±5V 3.3 ±VRL= 500Ω, VIN = ±10mV ±5V 3.2 ±VRL = 5k, VIN = ±10mV ±2.5V 1.1 ±V

IOUT Output Current VOUT = ±10V ±15V 10.0 mAVOUT = ±3.2V ±5V 6.4 mA

ISC Short-Circuit Current VOUT = 0V, VIN = ±3V ±15V 20 mA

SR Slew Rate AV = –1, RL = 5k (Note 4) ±15V 50 V/µs±5V 15 V/µs

GBW Gain Bandwidth f = 200kHz, RL = 10k ±15V 1.6 MHz± 5V 1.4 MHz

Channel Separation VOUT = ±10V, RL = 2k ±15V 99 dB

IS Supply Current Each Amplifier ±15V 380 µAEach Amplifier ±5V 350 µA

Note 1: Absolute Maximum Ratings are those values beyond which the lifeof a device may be impaired.Note 2: Differential inputs of ±10V are appropriate for transient operationonly, such as during slewing. Large, sustained differential inputs will causeexcessive power dissipation and may damage the part. See InputConsiderations in the Applications Information section of this data sheetfor more details.Note 3: A heat sink may be required to keep the junction temperaturebelow absolute maximum when the output is shorted indefinitely.Note 4: Slew rate is measured between ±8V on the output with ±12V

input for ±15V supplies and ±2V on the output with ±3V input for ±5Vsupplies.Note 5: Full-power bandwidth is calculated from the slew ratemeasurement: FPBW = (Slew Rate)/2πVP.Note 6: This parameter is not 100% tested.Note 7: The LT1352C/LT1353C are guaranteed to meet specifiedperformance from 0°C to 70°C. The LT1352C/LT1353C are designed,characterized and expected to meet specified performance from–40°C to 85°C but are not tested or QA sampled at these temperatures.The LT1352I/LT1353I are guaranteed to meet specified performancefrom –40°C to 85°C.

TYPICAL PERFORMANCE CHARACTERISTICS

UW

SUPPLY VOLTAGE (±V)0

SUPP

LY C

URRE

NT P

ER A

MPL

IFIE

R (µ

A)

200

250

125°C

25°C

–55°C

20

1352/53 G01

150

1005 10 15

350

300

Supply Current vs Supply Voltageand Temperature

SUPPLY VOLTAGE (±V)0

V–

COM

MON

MOD

E RA

NGE

(V)

0.5

1.5

2.0

V+

–1.5

10 20

1352/53 G02

1.0

–1.0

–0.5

–2.0

5 15

TA = 25°C∆VOS = 1mV

Input Common Mode Rangevs Supply Voltage

INPUT COMMON MODE VOLTAGE (V)–15

–20

INPU

T BI

AS C

URRE

NT (n

A)

–10

0

10

20

30

–10 –5 0 5

1352/53 G03

10 15

TA = 25°CVS = ±15V

IB =IB

+ + IB–

2

Input Bias Currentvs Input Common Mode Voltage

6

LT1352/LT1353

13523fa

TYPICAL PERFORMANCE CHARACTERISTICS

UW

Input Bias Current vs Temperature Open-Loop Gain vs Resistive LoadInput Noise Spectral Density

TEMPERATURE (°C)–50

0

INPU

T BI

AS C

URRE

NT (n

A)

4

12

16

20

40

28

0 50 75

1352/53 G04

8

32

36

24

–25 25 100 125

VS = ±15V

IB =IB

+ + IB–

2

LOAD RESISTANCE (Ω)

1060

OPEN

-LOO

P GA

IN (d

B)

90

100

110

100 1k 10k

1352/53 G06

80

70

TA = 25°C

VS = ±5V

VS = ±15V

FREQUENCY (Hz)

1

10

en

100

0.1

1

10

10 100

1352/53 G05

INPU

T VO

LTAG

E NO

ISE

(nV/

√Hz)

INPUT CURRENT NOISE (pA/√Hz)

1 1k 10k

in

TA = 25°CVS = ±15VAV = 101RS = 100k

Output Voltage Swingvs Load Current

Output Voltage Swingvs Supply VoltageOpen-Loop Gain vs Temperature

TEMPERATURE (°C)–50

OPEN

-LOO

P GA

IN (d

B)

98

99

100

25 75

1352/53 G07

97

96

–25 0 50 100 125

95

94

VS = ±15VVO = ±12VRL = 5k

OUTPUT CURRENT (mA)–20

V–

OUTP

UT V

OLTA

GE S

WIN

G (V

)

0.5

1.5

2.0

V+

25°C

25°C–1.5

–10 0 5

1352/53 G09

1.0

–1.0

–0.5

–2.0

–15 –5 10 15 20

VS = ±5VVIN = 10mV 85°C

85°C

–40°C

–40°C

–40°C –40°C

85°C

85°C

25°C

25°C

SUPPLY VOLTAGE (V)0

–3

–2

V+

15

1352/53 G08

3

2

5 10 20

1

V–

–1

OUTP

UT V

OLTA

GE S

WIN

G (V

)

TA = 25°CVIN = ±10mV

RL = 2k

RL = 2k

RL = 1k

RL = 1k

Settling Time vs Output Step(Inverting)

Settling Time vs Output Step(Noninverting)

Output Short-Circuit Currentvs Temperature

TEMPERATURE (°C)–50

45

50

60

SINK

25 75

1352/53 G10

40

35

–25 0 50 100 125

30

25

55

OUTP

UT S

HORT

-CIR

CUIT

CUR

RENT

(mA)

SOURCE

VS = ±15V

SETTLING TIME (µs)0.7

–10

OUTP

UT S

TEP

(V)

–8

–4

–2

0

10

4

0.9 1.1 1.2 1.6

1352/53 G11

–6

6

8

2

0.8 1 1.3 1.4 1.5

VS = ±15VAV = 1OUTPUTFILTER:1.6MHzLPF

10mV

10mV 1mV

1mV

SETTLING TIME (µs)0.5

OUTP

UT S

TEP

(V)

2

6

10

1.3

1352/53 G12

–2

–6

0

4

8

–4

–8

–100.7 0.9 1.10.6 1.40.8 1.0 1.2 1.5

VS = ±15VAV = –1RG = RF = 2kCF = 5pFRL = 2k

10mV 1mV

1mV10mV

7

LT1352/LT1353

13523fa

TYPICAL PERFORMANCE CHARACTERISTICS

UW

TEMPERATURE (°C)–50

2.00

GAIN

BAN

DWID

TH (M

Hz) PHASE M

ARGIN (DEG)

2.25

2.75

3.00

3.25

4.50

3.75

0 50 75

1352/53 G16

2.50

4.00

4.25

3.50

30

32

36

38

40

50

44

34

46

48

42

–25 25 100 125

VS = ±15V

VS = ±5V

VS = ±15V

VS = ±5V

PHASE MARGIN

GAIN BANDWIDTH

Gain Bandwidth and Phase Marginvs Temperature

Frequency Responsevs Supply Voltage (AV = –1)

FREQUENCY (Hz)10k

–1GAIN

(dB)

0

1

2

3

100k 1M 10M

1352/53 G18

–2

–3

–4

–5

4

5TA = 25°CAV = –1RF = RG = 5k

±15V±5V

±2.5V

Frequency Responsevs Capacitive Load

FREQUENCY (Hz)10k

–2GAIN

(dB)

0

2

4

6

100k 1M 10M

1352/53 G15

–4

–6

–8

–10

8

10TA = 25°CVS = ±15VAV = –1RFB = RG = 5k

C = 500pFC = 100pF

C = 5000pF

C = 1000pF

C = 10pF

Output Impedance vs Frequency

FREQUENCY (Hz)

0.1

OUTP

UT IM

PEDA

NCE

(Ω)

1

10

100

1000

1k 100k 1M 10M

1352/53 G14

0.0110k

TA = 25°CVS = ±15V

AV = 100AV = 10 AV = 1

Gain and Phase vs Frequency

FREQUENCY (Hz)

10

GAIN

(dB)

PHASE (DEG)20

40

60

70

1k 100k 1M 100M

1352/53 G13

0

10k 10M

50

30

–10

0

20

60

100

120

–20

80

40

–40

PHASE

GAIN

VS = ±15V

TA = 25°CAV = –1RF = RG = 5k

VS = ±15V

VS = ±5VVS = ±5V

FREQUENCY (Hz)10k

–1GAIN

(dB)

0

1

2

3

100k 1M 10M

1352/53 G17

–2

–3

–4

–5

4

5TA = 25°CAV = 1RL = 5k

±15V±5V

±2.5V

Frequency Responsevs Supply Voltage (AV = 1)

FREQUENCY (Hz)10

0

POW

ER S

UPPL

Y RE

JECT

ION

RATI

O (d

B)

20

40

60

80

120

100 1k 10k 100k

1352/53 G20

1M 10M

100

TA = 25°CVS = ±15V

–PSRR = +PSRR

SUPPLY VOLTAGE (±V)0

2.00

GAIN

BAN

DWID

TH (M

Hz) PHASE M

ARGIN (DEG)

2.25

2.75

3.00

4.50

3.75

10 20

1352/53 G19

2.50

4.00

4.25

3.50

3.25

30

32

36

38

50

44

34

46

48

42

40

5 15

TA = 25°C

PHASE MARGIN

GAIN BANDWIDTH

Gain Bandwidth and Phase Marginvs Supply Voltage

Power Supply Rejection Ratiovs Frequency

Common Mode Rejection Ratiovs Frequency

FREQUENCY (Hz)100

0

COM

MON

MOD

E RE

JECT

ION

RATI

O (d

B)

20

40

60

80

100

120

1k 10k 100k 1M

1352/53 G21

10M

TA = 25°CVS = ±15V

8

LT1352/LT1353

13523fa

TYPICAL PERFORMANCE CHARACTERISTICS

UW

SUPPLY VOLTAGE (±V)0

0

SLEW

RAT

E (V

/µs)

50

100

150

200

5 10

1352/53 G22

15

TA = 25°CAV = –1RF = RG = 5kSR = (SR+ + SR–)/2

Slew Rate vs Supply Voltage

INPUT LEVEL (VP-P)0

SLEW

RAT

E (V

/µs)

75

100

125

12 20

1352/53 G24

50

25

04 8 16

150

175

200

24

TA = 25°CVS = ±15VAV = –1RFB = RG = 5kSR = (SR+ + SR–)/2

TEMPERATURE (°C)–50 –25

0

SLEW

RAT

E (V

/µs)

100

250

0 50 75

1352/53 G23

50

200

150

25 100 125

AV = –1RF = RG = RL = 5kSR = (SR+ + SR–)/2

VS = ±15V

VS = ±5V

Slew Rate vs Temperature Slew Rate vs Input Level

Total Harmonic Distortionvs Frequency

FREQUENCY (Hz)10

TOTA

L HA

RMON

IC D

ISTO

RTIO

N (%

)

0.01

0.1

1

100 1k 10k 100k

1352/53 G25

0.001

TA = 25°CVS = ±15VRL = 5kVO = 2VP-P

AV = –1

AV = 1

Undistorted Output Swingvs Frequency (±15V)

FREQUENCY (Hz)10k

0

OUTP

UT V

OLTA

GE (V

P-P)

5

10

15

20

30

100k 1M

1352/53 G26

25

VS = ±15VRL = 5kTHD = 1%

AV = –1

AV = 1

Undistorted Output Swingvs Frequency (±5V)

FREQUENCY (Hz)10k

0

OUTP

UT V

OLTA

GE (V

P-P)

2

4

6

8

1

3

5

7

9

100k 1M

1352/53 G27

10

VS = ±5VRL = 5kTHD = 1%

AV = 1

AV = –1

2nd and 3rd Harmonic Distortionvs Frequency Capacitive Load Handling

FREQUENCY (Hz)100k

HARM

ONIC

DIS

TORT

ION

(dB)

–30

–40

–50

–60

–70

–80

–901M

1352/53 G28

3RD HARMONIC

2ND HARMONIC

VS = ±15VAV = 1RL = 5kVO = 2VP-P

FREQUENCY (Hz)

–100

CROS

STAL

K (d

B)

–90

–70

–50

– 40

100 10k 100k 10M

1352/53 G29

–110

1k 1M

–60

–80

–120

TA = 25°CAV = 1RL = 1kVIN = 15dBm

CAPACITIVE LOAD (F)10p

40

OVER

SHOO

T (%

)

50

60

70

80

100p 1n 10n 0.1µ 1µ

1352/53 G30

30

20

10

0

90

100TA = 25°CVS = ±15VRL = 5k

AV = 1

AV = –1

Crosstalk vs Frequency

9

LT1352/LT1353

13523fa

TYPICAL PERFORMANCE CHARACTERISTICS

UW

Small-Signal Transient(AV = 1)

Small-Signal Transient(AV = –1)

Small-Signal Transient(AV = –1, CL = 1000pF)

1352/53 G331352/53 G321352/53 G31

Large-Signal Transient(AV = 1)

Large-Signal Transient(AV = –1)

Large-Signal Transient(AV = 1, CL = 10,000pF)

1352/53 G361352/53 G351352/53 G34

APPLICATIONS INFORMATION

WU UU

Layout and Passive Components

The LT1352/LT1353 amplifiers are easy to use and toler-ant of less than ideal layouts. For maximum performance(for example, fast 0.01% settling) use a ground plane,short lead lengths and RF-quality bypass capacitors (0.01µFto 0.1µF). For high drive current applications use low ESRbypass capacitors (1µF to 10µF tantalum).

The parallel combination of the feedback resistor andgain setting resistor on the inverting input can combinewith the input capacitance to form a pole which can causepeaking or even oscillations. If feedback resistors greaterthan 10k are used, a parallel capacitor of value, CF >(RG)(CIN/RF), should be used to cancel the input pole andoptimize dynamic performance. For applications wherethe DC noise gain is one and a large feedback resistor isused, CF should be greater than or equal to CIN. Anexample would be an I-to-V converter as shown in theTypical Applications section.

Capacitive Loading

The LT1352/LT1353 are stable with any capacitive load.As the capacitive load increases, both the bandwidth andphase margin decrease so there will be peaking in thefrequency domain and in the transient response. Graphsof Frequency Response vs Capacitive Load, CapacitiveLoad Handling and the transient response photos clearlyshow these effects.

Input Considerations

Each of the LT1352/LT1353 inputs is the base of an NPNand a PNP transistor whose base currents are of oppositepolarity and provide first-order bias current cancellation.Because of variation in the matching of NPN and PNP beta,the polarity of the input bias current can be positive ornegative. The offset current does not depend on NPN/PNPbeta matching and is well controlled. The use of balancedsource resistance at each input is recommended for

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LT1352/LT1353

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APPLICATIONS INFORMATION

WU UU

applications where DC accuracy must be maximized. Theinputs can withstand transient differential input voltagesup to 10V without damage and need no clamping or sourceresistance for protection. Differential inputs, however,generate large supply currents (tens of mA) as required forhigh slew rates. If the device is used with sustaineddifferential inputs, the average supply current will in-crease, excessive power dissipation will result and the partmay be damaged. The part should not be used as acomparator, peak detector or other open-loop applica-tion with large, sustained differential inputs. Undernormal, closed-loop operation, an increase of power dis-sipation is only noticeable in applications with large slewingoutputs and is proportional to the magnitude of thedifferential input voltage and the percent of time that theinputs are apart. Measure the average supply current forthe application in order to calculate the power dissipation.

Circuit Operation

The LT1352/LT1353 circuit topology is a true voltagefeedback amplifier that has the slewing behavior of acurrent feedback amplifier. The operation of the circuit canbe understood by referring to the Simplified Schematic.

The inputs are buffered by complementary NPN and PNPemitter followers which drive R1, a 1k resistor. The inputvoltage appears across the resistor generating currentswhich are mirrored into the high impedance node andcompensation capacitor CT. Complementary followersform an output stage which buffers the gain node from theload. The output devices Q19 and Q22 are connected toform a composite PNP and a composite NPN.

The bandwidth is set by the input resistor and the capaci-tance on the high impedance node. The slew rate isdetermined by the current available to charge the highimpedance node capacitance. This current is the differen-tial input voltage divided by R1, so the slew rate isproportional to the input. Highest slew rates are thereforeseen in the lowest gain configurations. For example, a 10Voutput step in a gain of 10 has only a 1V input step whereasthe same output step in unity gain has a 10 times greater

input step. The graph Slew Rate vs Input Level illustratesthis relationship. In higher gain configurations the large-signal performance and the small-signal performanceboth look like a single pole response.

Capacitive load compensation is provided by the RC, CCnetwork which is bootstrapped across the output stage.When the amplifier is driving a light load the network hasno effect. When driving a capacitive load (or a low valueresistive load) the network is incompletely bootstrappedand adds to the compensation at the high impedancenode. The added capacitance slows down the amplifierand a zero is created by the RC combination, both of whichimprove the phase margin. The design ensures that evenfor very large load capacitances, the total phase lag cannever exceed 180 degrees (zero phase margin) and theamplifier remains stable.

Power Dissipation

The LT1352/LT1353 combine high speed and large outputdrive in small packages. Because of the wide supplyvoltage range, it is possible to exceed the maximumjunction temperature of 150°C under certain conditions.Maximum junction temperature TJ is calculated from theambient temperature TA and power dissipation PD asfollows:

LT1352CN8: TJ = TA + (PD)(130°C/W)LT1352CS8: TJ = TA + (PD)(190°C/W)LT1353CS: TJ = TA + (PD)(150°C/W)

Worst-case power dissipation occurs at the maximumsupply current and when the output voltage is at 1/2 ofeither supply voltage (or the maximum swing if less than1/2 supply voltage). For each amplifier PD(MAX) is:

PD(MAX) = (V+ – V–)(IS(MAX)) + (V+/2)2/RL or(V+ – V –)(IS(MAX)) + (V+ – VMAX)(IMAX)

Example: LT1353 in S14 at 85°C, VS = ±15V, RL = 500Ω,VOUT = ±5V (±10mA)

PD(MAX) = (30V)(380µA) + (15V – 5V)(10mA) = 111mWTJ = 85°C + (4)(111mW)(150°C/W) = 152°C

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LT1352/LT1353

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SI PLIFIED SCHE ATIC

W W

R3

R6

R7

RC

R2

R5R4

Q21

OUTPUT

1352/53 SS

Q22Q13

Q15

Q18

+IN–IN

V+

V–

Q12Q11

Q9

Q17

Q16

Q10

Q14 Q23

C1

C2

CC

CT

Q1Q2

Q4

Q3R11k

Q8

Q7

Q6Q5

Q19

Q20

Q24

12

LT1352/LT1353

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TYPICAL APPLICATIONS

U

–

+

1/2LT1352

1.5k 10k

10k

1N5712

BPV22NF VOUT

1352/53 TA05

10nF

10k

10nF

–

+

1/2LT1352

DAC I-to-V Converter

400kHz Photodiode Preamp with 10kHz Highpass Loop

–

+

1/2LT1352565A TYPE

12DAC

INPUTS

5k

5k

10pF

VOUT

1352/53 TA03VOS + IOS (5kΩ) + < 0.5LSB

VOUTAVOL

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LT1352/LT1353

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N8 Package8-Lead PDIP (Narrow .300 Inch)(Reference LTC DWG # 05-08-1510)

PACKAGE DESCRIPTION

U

N8 1002

.065(1.651)

TYP

.045 – .065(1.143 – 1.651)

.130 ± .005(3.302 ± 0.127)

.020(0.508)

MIN.018 ± .003(0.457 ± 0.076)

.120(3.048)

MIN

1 2 3 4

8 7 6 5

.255 ± .015*(6.477 ± 0.381)

.400*(10.160)

MAX

.008 – .015(0.203 – 0.381)

.300 – .325(7.620 – 8.255)

.325+.035–.015+0.889–0.3818.255( )

NOTE:1. DIMENSIONS ARE

INCHESMILLIMETERS

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)

.100(2.54)BSC

14

LT1352/LT1353

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.016 – .050(0.406 – 1.270)

.010 – .020(0.254 – 0.508)

× 45°

0°– 8° TYP.008 – .010

(0.203 – 0.254)

SO8 0303

.053 – .069(1.346 – 1.752)

.014 – .019(0.355 – 0.483)

TYP

.004 – .010(0.101 – 0.254)

.050(1.270)

BSC

1 2 3 4

.150 – .157(3.810 – 3.988)

NOTE 3

8 7 6 5

.189 – .197(4.801 – 5.004)

NOTE 3

.228 – .244(5.791 – 6.197)

.245MIN .160 ±.005

RECOMMENDED SOLDER PAD LAYOUT

.045 ±.005 .050 BSC

.030 ±.005 TYP

INCHES(MILLIMETERS)

NOTE:1. DIMENSIONS IN

2. DRAWING NOT TO SCALE3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)

S8 Package8-Lead Plastic Small Outline (Narrow .150 Inch)

(Reference LTC DWG # 05-08-1610)

PACKAGE DESCRIPTION

U

15

LT1352/LT1353

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Information furnished by Linear Technology Corporation is believed to be accurate and reliable.However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

S Package14-Lead Plastic Small Outline (Narrow .150 Inch)

(Reference LTC DWG # 05-08-1610)

1

N

2 3 4

.150 – .157(3.810 – 3.988)

NOTE 3

14 13

.337 – .344(8.560 – 8.738)

NOTE 3

.228 – .244(5.791 – 6.197)

12 11 10 9

5 6 7

N/2

8

.016 – .050(0.406 – 1.270)

.010 – .020(0.254 – 0.508)

× 45°

0° – 8° TYP.008 – .010

(0.203 – 0.254)

S14 0502

.053 – .069(1.346 – 1.752)

.014 – .019(0.355 – 0.483)

TYP

.004 – .010(0.101 – 0.254)

.050(1.270)

BSC

.245MIN

N

1 2 3 N/2

.160 ±.005

RECOMMENDED SOLDER PAD LAYOUT

.045 ±.005 .050 BSC

.030 ±.005 TYP

INCHES(MILLIMETERS)

NOTE:1. DIMENSIONS IN

2. DRAWING NOT TO SCALE3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)

PACKAGE DESCRIPTION

U

16

LT1352/LT1353

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–

+

1/2LT1352

11.3k5.49k

13.3k4.64k

4.64k

5.49k

220pF

VOUT

VIN

1352/53 TA04

470pF

2200pF

4700pF

–

+

1/2LT1352

20kHz, 4th Order Butterworth Filter

TYPICAL APPLICATIONS

U

LINEAR TECHNOLOGY CORPORATION 1996

LT/TP 0603 1K REV A • PRINTED IN USA

RELATED PARTSPART NUMBER DESCRIPTION COMMENTSLT1351 250µA, 3MHz, 200V/µs Op Amp Good DC Precision, C-Load Stable, Power Saving ShutdownLT1354/55/56 Single/Dual/Quad 1mA, 12MHz, 400V/µs Op Amp Good DC Precision, Stable with All Capacitive Loads

Linear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417(408) 432-1900 FAX: (408) 434-0507 www.linear.com