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May 1999
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CA3088E
AM Receiver Subsystem and General-Purpose Amplifier Array
[ /Title (CA30 88E) /Subject (AM Receiv er Subsystem and GeneralPurpose Amplifier Array) /Autho r () /Keywords () /Creator () /DOCI NFO pdfmark [ /PageMode /UseOutlines /DOCVIEW pdfmark
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-Band Amplifier * 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
Description
The CA3088E, a monolithic integrated circuit, is an AM subsystem that provides the converter, IF amplifier, detector, and audio preamplifier stages for an AM receiver. The CA3088E also provides internal AGC for the first IF amplifier stage, delayed AGC for an optional external RF amplifier, a buffer stage to drive a tuning meter, and terminals facilitating the optional use of a tone control. Figure 2 is a functional diagram of the CA3088E. The signal from the low-noise converter is applied to the first IF amplifier and is then coupled to the second IF amplifier. This IF signal is then detected and externally filtered. The resultant audio signal is applied to an audio preamplifier. Optionally, a tone control circuit may be connected at the junction of the detector circuit and the audio preamplifier. The gain of the first IF amplifier stage is controlled by an internal AGC circuit. The CA3088E supplies a delayed AGC signal output for use with an external RF amplifier. A buffered output signal is also available for driving a tuning meter. A DC voltage, internally regulated by a Zener diode, supplies the second IF amplifier, the AGC and tuning meter circuits and may also be used with any other stage. The CA3088E features four independent transistor amplifiers, each incorporating internal biasing for temperature tracking. These amplifiers are particularly useful in generalpurpose amplifier, oscillator, and detector applications in a wide variety of equipment designs.
Part Number Information
PART NUMBER CA3088E TEMP. RANGE (oC) -40 to 85 PACKAGE 16 Ld PDIP PKG. NO. E16.3
Pinout
CA3088E (PDIP) TOP VIEW
CONV. BYPASS 1 CONV. IN 2 CONV. OUT 3 1ST IF IN 4 GND 5 1ST IF OUT 6 2ND IF FB 7 2ND IF IN 8
16 AUDIO V+ 15 AUDIO OUT 14 AUDIO IN 13 RF AGC 12 TUNING METER 11 AGC FILTER 10 2ND IF V+ 9 DET. OUT
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. Copyright
(c) Harris Corporation 1999
File Number
560.2
8-23
CA3088E
Absolute Maximum Ratings
TA = 25oC
Thermal Information
Thermal Resistance (Typical, Note 1) JA (oC/W) PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 Maximum Junction Temperature (Plastic Package) . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC
Supply Voltage (Across Term. 5 and Terms. 3, 6, 13, 16, Respectively) . . . . . 16V Output Current Terminals 3, 6, 13, 16, (Respectively). . . . . . . . . . . . . . . . . 10mA Terminal 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE: 1. JA is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
PARAMETER DC CHARACTERISTICS Voltage (Figure 1)
TA = 25oC, V+ = 12V SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
V1, V4, V9, V11 V2, V7, V8 V10 V12 V15
Terminals 1, 4, 9, 11 Terminals 2, 7, 8 Terminal 10 Terminal 12 Terminal 15 Terminal 3 Terminal 6 Terminal 10 Terminal 13 Terminal 16
-
0.7 1.4 5.6 0 3.5 0.35 1.0 20 0 1.2
-
V V V V V mA mA mA mA mA
Current (Figure 1)
I3 I6 I10 I13 I16
DYNAMIC CHARACTERISTICS Detector Output (Figure 2) Audio Amplifier Gain (Figure 2) Audio Distortion (Figure 2) Sensitivity (fIN = 1MHz, Signal-to-Noise Ratio (S/N) = 20dB)) Total Harmonic Distortion (Figure 2) Input Resistance (No AGC, fIN = 1MHz) Input Capacitance (No AGC, fIN = 1MHz) Feedback Capacitance (No AGC, fIN = 1MHz) THD RIN AAF 30% Modulation f = 1kHz VOUT = 100mV At Converter Stage Input (Figure 2) At RF Stage Input (Figure 2) 30% Modulation At Transistor Q1 At Transistor Q5 CIN At Transistor Q1 At Transistor Q5 CFB At Transistor Q1 At Transistor Q5 75 30 0.2 200 100 1.0 3500 2000 17 12 1.5 1.5 mVRMS dB % V/m V/m % pF pF pF pF
8-24
CA3088E
V+ = 12V
0.1F
1
2
3
4
5
6
7
8
0.1F
CA3088E
16 15 14 13 12 11 10 330 5k 5k
9
2k
1k
FIGURE 1. TEST CIRCUIT FOR DC CHARACTERISTICS
200 0.05F 0.05F
100
150 V+ = 9V
OSC. TUNING 3 GANG 2 0.05 CONVERTER TO RF STAGE OF ANTENNA
130pF 0.039 4 6 7 8 0.05 10
0.02
2000
0.01
10K
9 IF AMPLIFIER 2ND IF AMPL. AND DET. TO DETECTOR FILTER AND AUDIO (OPTIONAL TONE CONTROL MAY BE SHUNTED FROM TERMINAL 9 TO GROUND) 25
CA3088E METER OUTPUT 1 0.01 AGC TO RF AMPLIFIER 13 RF AGC IF AGC AUDIO PREAMPLIFIER
TO TUNING 12 METER
14
FROM DETECTOR FILTER 5600
AUDIO 15 OUTPUT
25 6800 5 SUBSTRATE 50 11 16 V+ = 9V 10 1500
NOTE: Resistance values are in . Capacitance values in F, except as noted. FIGURE 2. FUNCTIONAL BLOCK DIAGRAM OF THE CA3088E
8-25
CA3088E
CONVERTER INPUT BYPASS CONVERTER 3 1 OUTPUT CONVERTER INPUT 2 Q1 Q5 Q7 Q9 R2 2K R8 4K R13 5K R16 5K R14 5K
1ST IF AMPLIFIER 4 INPUT 6 OUTPUT
2ND IF AMPLIFIER 8 INPUT R15 5K Q10
V+ 10
200
Q12 9 7 DETECTOR OUTPUT SECOND IF FEEDBACK
5.6V R1 6.8K R3 4K Q2 D1 D2 Q6 Z1 R12 4.7K 200 R19 Q14 6.8K R21 5.6K Q4 D3 D4 Q3 R7 1.5K R11 2.2K R6 2K R9 1K R10 220 D5 R17 200 Q8 Q11 Q13 R20 1.2K R18 6K 200
16 V+
AUDIO 15 OUTPUT
R4 700
R5 5.5K
ALL RESISTANCE VALUES ARE IN OHMS
5
SUBSTRATE
13 AGC OUTPUT 11 FOR OPTIONAL RF STAGE
12
AGC FILTER
TO TUNING METER
14
AUDIO INPUT FROM DETECTOR FILTER
FIGURE 3. SCHEMATIC DIAGRAM OF THE CA3088E
8-26

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