CXA1002 | DigiCamel IC Datasheet

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CXA1002 SONY | Alldatasheet

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Technical content

SONY. CXA1002M/N Low Power FM IF Amplifier Description Package Outline Unit: mm CXA1002M/N is an FM IF amplifier most suitable = for cellular and FM radios. CXA1002M _ 16 pin SOP (Plastic) Features asttt sasilfs © Includes all the functions needed for cellular radios f such as FM detecting circuit, RSSI, IF amplifier RARRAARA and others. Tar] | 2s « Wide operating voltage range 4.5 to 9.5 V and | 3 8 low current consumption. a (During Vec=5 V, Icc=2.5 mA Typ.) epee eee t 5 © Built-in audio output buffer circuit reduces external asta 427 onal parts to a minimum. * Wide range RSSI and excellent temperature characteristics. « Compact 16 pin SOP and 16 pin VSOP package. a a Functions eee) * IF amplifier and limiter * RSSI (Recelved Signal Strength Indicator) $0P-16P-L01 * FM detecting circuit CXA1002N 16 pin VSOP (Plastic) Structure Bipolar silicon monolithic IC sot pa ” Lge) Absolute Maximum Ratings (Ta=25°C) : 7 A * Supply voltage Vee 17 Vv lo | 5 | * Operating temperature Tstg -95 to +85 °C 5 ® * Storage temperature Topr -§5 to +150 °C be | ‘ot * Allowable power dissipation Po 500 mW oath 2 cust Recommended Operating Condition att © Supply voltage Vec 45 to 95 V a] Al tio Note) The size marked * does not Include the remaining resin. VSOP-16P-LO1 80518-YA M™ 8382383 O005bb9 564 MM -27-

a SONY CXA1002M/N SON Ye Block Diagram and Pin Configuration (Top View) Lm vece@) Ax ous in Lmoecs @) (e)Rssi out mount F0Ec: @) Q)ono Pin Description and Equivalent circuit a [eof ve [soy —*d Sin RSSI OUT ve ‘The current output corresponds to the input signal level to IF and LIM amplifiers. AUDIO 25V 1 FM detected signal is output. OUT 33V ve % Input pin of quadrature detecting - circuit. Fox —_— MB 8382383 0005670 cob 2g -

SONY. CXA1002M/N eS [No] symoo | ais | Equivalent Circuit Description . UM OUT 17V ve Output pin of Iimiter. ay bn | 35K t tq is UMDEC2 | 1.7V ia t * Input and decoupling pin of ry Not Wy re limiter. Connect pins 10 and 12 to . © a GND by means of a capacitor Pe] (0.01 to 0.047 pF). © ae Fi Choon \\F OUT 1.6V egy ‘Output pin of IF amplifier. fn fog IE Dec2 | 16Vv = “ Input and decoupling pin of IF iF Bec: | 18¥ ca aro. me 3 | Ty] tev e ite Connect pins 14 and 16 to GND al ia SK by means of a capacitor (0.01 to i % * Oa 0.047 uF). t "

Electrical Characteristics

SONY. CxA1002M/N Electrical Characteristics Test Circuit come owt 00 oo cone eel O—-D—-O—O-) nad Y wa 1 | g po OT an T° Mont are rT 29 § hm LE ar oo Operation Signals passing through the fllter and input through pin 15, amplified at IF amplifier and output through pin 13. IF amplifier output is subjected again to band limitation, to amplitude limitation at the limiter amplifier and output through pin 8. The limiter amplifier output is phase shifted at the LC resonance circult and after undergoing quadrature detection, audio signals are output from pin 6. For RSSI, at IF and limiter amplifiers stages, a current corresponding to the Input levels is obtained, added up and output from pin 5. RSS! voltage output Is obtained by connecting a sultable | to V conversion circuit (resister and capacitor parallel circult) to pin 5. Application Circuit wxdrt | oo coy ois as OOOO i ard | gp rad “ “SF Son SSS M@™ 8382383 O00Sb72 O59 we _30-

———. Se SONY. ‘CxAT002M/N Notes on Usage Voltage gain of IF amplifier in CXA1002M/N Is about 36 dB. Voltage gain of the limiter amplifier is rather high at 72 dB. Please take the following precautions: 1. Decouple pin 4 (Vcc) with L and C as near to the pins as possible. 2. Be sure to ground pins 2, 3 and 9 (NC). 3. Separate input line from the output line as far as possible, and make the wiring short. 4. Decoupling capacitors of IF amplifier (pins 14, 16) and limer amplifier (pins 10, 12) should be grounded as close to the respective pins as possible. 5. Work out the GND pattern to obtain an impedance as low as possible. 6. Electrostatic separation of the limiter amplifier input and output parts by setting up and shield plate gives better efficiency. (Mark use of pin 1 GND and pin 9 NC) Application Note 1) Supply With the built-in voltage regulator, CXA1002M/N has wide operating power supply voltage range from +45 to 95 V (Typ. 5.0 V). Within the above supply voltage range, there are almost no changes in the characteristics. Decouple pin 4 (Vcc) with L and C. (See Fig. below) O01 T “ Decoupling 2) Filter The most suitable band pass filter to be connected between pins 13 and 11 of CXA1002M/N should have the following specifications. * 1/0 impedance 1 1.5 kK £10% * Insertion loss (center frequency): <6 dB 3) Phase shifter To execute quadrature FM detection, the limiter output (pin 8) phase Is shifted 90° by means of the RLC parallel resonance circuit or the discriminator and Input through pin 7. The Fig. below show the phase shifter made up by the RLC parallel resonance circuit. In this case set L, C value so that the 2nd IF signal frequency and the parallel resonance frequency become similar. As R value sets the audio output level, select this value so as to obtain the required output. LIMOUT QUAD IN act REC I us RLC Phase Shifter SSeS BS 8342383 0005673 795 Ms, ec

SONY. CxAI002M/N SONS 4) Audio output FM modulated audio and data signals are demodulated at the previous stage and output from pin 6 (Audio out). 5) RSSI RSSI is function that detects the magnitude of the input signal level. In CXA1002M/N, it is output with current, and increases almost uniformly within the range of IF input level -100 to 0 dBm (2.24 4 to 224 mVrms). It is almost free from the supply voltage and temperature Influence. However the output current Is distributed within a range of +20% by means of the resistance inside the IC. When voltage output is required, it performs | to V conversion by means of a resistance. The value of that resistance Is determined by RSSI's maximum output current and the maximum allowable voltage of pin 5. With RSSI's maximum output current at about 60 4A (Typ. 45 yA) and the allow- able maximum voltage (performance guaranteed maximum voltage) at Vcc —1.8 V, select the resis- tance according to the supply voltage and the required output voltage. When an output voltage of Vcc -1.8 V and above is required use the function after amplifying by means of an operational amplifier. When the RSS! output voltage is required at AMPS which is the cellular radio standard. A uniform increase from 0 V is defined. However, for CXA1002M/N as there is an offset of about 0.3 to 0.5 V (Vcc=5 V, Ri=51 kf), arrange to start from 0 V by using an offset compensation circuit. rst VRssi c i Re RSSI | to V circuit v Vv H i Hf ' > ' H Compensation ' { ' ° { H ° t Input level Input level RSSI output voltage offset compensation M@ 4342383 0005674 92] a -32- ——E mk aaa ena nr

SONY. CXA1002M/N SONY Ca IF amplifier voltage gain frequency characteristics Limiter amplifier voltage gain frequency characteristics a RF level = -50dBm sg if RF ni -90dBm 2 = sf Han eee LM Es Et HH }- 1 reiieeeeats g Set I INET 8 ITP TTT TTI eH MICHACH HEHE TH € - oe io Bx m om Frequency (Hz) a Frequency (Hz) Audio demodulation characterises oF ae oun Audio |/O characteristics *Used Audio Test Circui g ae CDOT ws

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S Li A MPe | 3 ue 7] [TOWEL | Aucio measurement z. aie 2 -20 (Af eteuit SID eeaeee se i- SST] Per ppit “ULL pet} BE ee ee ar Input level (dBm) audio out level (68) fad RSSI characteristics RX-audio filter frequency characteristics rs (A-B AMPS Standard) (GPF+DEEMP) a |— ef bl Poet Z [A STW JTS gap ft yp Ba yt PIN a Aen | | 2 | LENT °(20 -100 60 -@ sao oO rr) 1K 10K IF - Input level (dBm) Frequency (Hz) a MB 8382383 OOOSb7S 4b4 MM -33- ee

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Product Information

CXA1002 specifications and overview.

Summary

LOW POWER FM IF AMPLIFIER

Description

CXA1002M/N is an FM IF amplifier most suitable for cellular and FM radios.

Source title CXA1002 Datasheet(PDF) - Sony Corporation

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