8-23

May 1999

CA3088EAM Receiver Subsystem and

General-Purpose Amplifier Array

Features• Excellent Overload Characteristics

• AGC for IF Amplifier

• Buffered Output Signal for Tuning Meter

• Internal Zener Diode Provides Voltage Regulation

• Two IF Amplifier Stages

• Low-Noise Converter and First IF Amplifier

• Low Harmonic Distortion (THD)

• Delayed AGC for RF Amplifier

• Terminals for Optional Inclusion of Tone Control

• Operates from Wide Range of Power Supplies:V+ = 6V to 16V

• Optional AC and/or DC Feedback on Wide-BandAmplifier

• Array of Amplifiers for General-Purpose Applications

• Suitable for Use With Optional External RF Stage,Either MOS or Bipolar

• Related at:- Refer to AN6022 for Application Note Information

DescriptionThe CA3088E, a monolithic integrated circuit, is an AM sub-system that provides the converter, IF amplifier, detector,and audio preamplifier stages for an AM receiver.

The CA3088E also provides internal AGC for the first IFamplifier stage, delayed AGC for an optional external RFamplifier, a buffer stage to drive a tuning meter, and termi-nals facilitating the optional use of a tone control.

Figure 2 is a functional diagram of the CA3088E. The signalfrom the low-noise converter is applied to the first IF ampli-fier and is then coupled to the second IF amplifier. This IFsignal is then detected and externally filtered. The resultantaudio signal is applied to an audio preamplifier. Optionally, atone control circuit may be connected at the junction of thedetector circuit and the audio preamplifier. The gain of thefirst IF amplifier stage is controlled by an internal AGC cir-cuit. The CA3088E supplies a delayed AGC signal output foruse with an external RF amplifier. A buffered output signal isalso available for driving a tuning meter. A DC voltage, inter-nally regulated by a Zener diode, supplies the second IFamplifier, the AGC and tuning meter circuits and may also beused with any other stage.

The CA3088E features four independent transistor amplifi-ers, each incorporating internal biasing for temperaturetracking. These amplifiers are particularly useful in general-purpose amplifier, oscillator, and detector applications in awide variety of equipment designs.

PinoutCA3088E

(PDIP)TOP VIEW

Part Number Information

PART NUMBERTEMP.

RANGE (oC) PACKAGEPKG.NO.

CA3088E -40 to 85 16 Ld PDIP E16.3

14

15

16

9

13

12

11

10

1

2

3

4

5

7

6

8

CONV. BYPASS

CONV. IN

CONV. OUT

1ST IF IN

GND

1ST IF OUT

2ND IF IN

2ND IF FB

AUDIO V+

AUDIO IN

RF AGC

TUNING METER

AGC FILTER

2ND IF V+

DET. OUT

AUDIO OUT

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.

Copyright © Harris Corporation 1999File Number 560.2

[ /Title(CA3088E)/Sub-ject(AMReceiver Sub-sys-temandGen-eral-Pur-poseAmpli-fierArray)/Author ()/Key-words()/Cre-ator ()/DOCINFOpdf-mark

[/Page-Mode/Use-Out-lines/DOC-VIEWpdf-mark

OBSOLETE PRODUCT

NO RECOMMENDED REPLACEMENT

Call Central Applications 1-800-442-7747

or email: centapp@harris.com

8-24

Absolute Maximum Ratings TA = 25oC Thermal InformationSupply Voltage

(Across Term. 5 and Terms. 3, 6, 13, 16, Respectively) . . . . . 16VOutput Current

Terminals 3, 6, 13, 16, (Respectively). . . . . . . . . . . . . . . . . 10mATerminal 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA

Operating ConditionsTemperature Range . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC

Thermal Resistance (Typical, Note 1) θJA (oC/W)

PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110Maximum Junction Temperature (Plastic Package) . . . . . . . 150oCMaximum Storage Temperature Range . . . . . . . . . -65oC to 150oCMaximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operationof the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTE:

1. θJA is measured with the component mounted on an evaluation PC board in free air.

Electrical Specifications TA = 25oC, V+ = 12V

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS

DC CHARACTERISTICS

Voltage (Figure 1) V1, V4, V9, V11 Terminals 1, 4, 9, 11 - 0.7 - V

V2, V7, V8 Terminals 2, 7, 8 - 1.4 - V

V10 Terminal 10 - 5.6 - V

V12 Terminal 12 - 0 - V

V15 Terminal 15 - 3.5 - V

Current (Figure 1) I3 Terminal 3 - 0.35 - mA

I6 Terminal 6 - 1.0 - mA

I10 Terminal 10 - 20 - mA

I13 Terminal 13 - 0 - mA

I16 Terminal 16 - 1.2 - mA

DYNAMIC CHARACTERISTICS

Detector Output (Figure 2) 30% Modulation - 75 - mVRMS

Audio Amplifier Gain (Figure 2) AAF f = 1kHz - 30 - dB

Audio Distortion (Figure 2) VOUT = 100mV - 0.2 - %

Sensitivity(fIN = 1MHz, Signal-to-Noise Ratio(S/N) = 20dB))

At Converter Stage Input (Figure 2) - 200 - µV/m

At RF Stage Input (Figure 2) - 100 - µV/m

Total Harmonic Distortion (Figure 2) THD 30% Modulation - 1.0 - %

Input Resistance(No AGC, fIN = 1MHz)

RIN At Transistor Q1 - 3500 - Ω

At Transistor Q5 - 2000 - Ω

Input Capacitance(No AGC, fIN = 1MHz)

CIN At Transistor Q1 - 17 - pF

At Transistor Q5 - 12 - pF

Feedback Capacitance(No AGC, fIN = 1MHz)

CFB At Transistor Q1 - 1.5 - pF

At Transistor Q5 - 1.5 - pF

CA3088E

8-25

141516 913 12 11 10

1 2 3 4 5 76 8

CA3088E

V+ = 12V

0.1µF 0.1µF

5kΩ 5kΩ

1kΩ

330Ω

2kΩ

FIGURE 1. TEST CIRCUIT FOR DC CHARACTERISTICS

CA3088E

IFCONVERTER

RF IF AGC

SUBSTRATE

AUDIOPREAMPLIFIER

METEROUTPUT

2NDIF AMPL.AND DET.

AGCTO RF

AMPLIFIER

TO RF STAGEOF ANTENNA

OSC.TUNING

0.05µFV+ = 9V

TO DETECTORFILTER AND AUDIO(OPTIONAL TONECONTROL MAY BE

TERMINAL 9

TO TUNINGMETER

FROM

FILTER

AUDIO

V+ = 9V

3

9

11

14

15

16

0.05µF

GANG

200

2

4 6 7 8

10

12

5

1

13

NOTE: Resistance values are in Ω. Capacitance values in µF, except as noted.

FIGURE 2. FUNCTIONAL BLOCK DIAGRAM OF THE CA3088E

100 150

AMPLIFIER

TO GROUND)

SHUNTED FROM

0.02

DETECTOR

0.05

50

0.01

0.01 10K

25

10 1500

OUTPUT 5600

680025

0.05

AGC

130pF

0.039

2000

CA3088E

8-26

1213

9

7

16

2

CONVERTERINPUT

CONVERTEROUTPUT

CONVERTERINPUT BYPASS

R34K

Q2

R4700

D1

D2

D3

D4

SUBSTRATE AGC OUTPUTFOR OPTIONALRF STAGE

R5

5.5K

Q3

R11

2.2K

AGCFILTER

TOTUNINGMETER

AUDIO INPUTFROM DETECTOR FILTER

D5R10220

R91K

Q8

Z1

5.6V

R124.7K

200

R19

6.8K

R201.2K

R215.6K

R186K

Q13

R17200

AUDIO

V+

R145K

R165K

R135K

Q7 Q10

200

Q12

OUTPUT

R62K

R71.5K

Q11

R155K

V+1ST IF AMPLIFIER

INPUT OUTPUT

2ND IFAMPLIFIERINPUT

Q5

200

Q14

Q4

DETECTOR

SECOND IFFEEDBACK

OUTPUT

Q6

Q9

Q1

ALL RESISTANCEVALUES ARE INOHMS

R22K

R16.8K

5

R84K

10

FIGURE 3. SCHEMATIC DIAGRAM OF THE CA3088E

15

1411

86413

CA3088E

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