cxa1999n Sony Electronics, cxa1999n Datasheet
cxa1999n
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cxa1999n Summary of contents
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... IF Amplifier for M-ary FSK Pagers Description The CXA1999N is a low current consumption FM IF amplifier which employs the newest bipolar process suitable for M-ary FSK pagers. Features • Low current consumption: 1.16 mA (typ 1 • Low voltage operation 1 • Small package 20-pin SSOP • ...
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... CXA1999N ...
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... GND 72 6 Controls the battery saving. 40k Setting this pin low suspends the operation of IC. (Applied voltage range: –0 140k +7.0 V) GND V CC Connects the capacitor that 72 determines the low cut-off 7 frequency for the entire system. GND —3— CXA1999N Description . ...
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... GND V CC 50p FM detector output 55k GND RSSI circuit output. 70k GND V CC Operational amplifier input GND V CC Level comparator and NRZ 72 comparator inputs. Output for 12 operational amplifier is 72 connected. GND —4— CXA1999N Description ...
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... GND +7 Output for internal constant- voltage source amplifier. Connect the base of PNP 17 72 transistor. (Current capacity: 100 µA) GND V CC Constant-voltage source output. 78k 18 Controlled to maintain 1 22k GND Ground 4.16k 4.16k Mixer input. 20 GND —5— CXA1999N Description ...
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... TLBSV V Measurement circuit 3 IN (LIM) V Measurement circuit 11 SATLC I Measurement circuit 10 LLC V Measurement circuit 12 ORSSI R — INLIM R — OUTMIX R — INLIM —6— CXA1999N = 1.6 kHz 4.8 kHz DEV MOD Min. Typ. Max. Unit 0.8 1.16 1.5 mA — µA 30k LPF 25 — — dB — ...
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... CXA1999N ...
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... CXA1999N ...
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... CXA1999N ...
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... Application Note 1) Power Supply The CXA1999N, with built-in regulator, is designed to permit stable operation at wide range of supply voltage from 1.1 to 4.0 V. Decouple the wiring Oscillator Input Oscillator input method a) Using Pins 1 and 2, input self-excited oscillation signal through the composition of a Colpitts type crystal oscillator circuit ...
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... Quick Charge In order to hasten the rising time from when power is turned on, the CXA1999N features a quick charge circuit. Therefore, the quick charge circuit eliminates the need to insert a capacitor between the detector output and the LPF as is the case with conventional ICs, but connects a capacitor to Pin 7 to determine the average signal level during steady-state reception ...
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... CMOS device. The setting voltage of the LVA is 1.05 V (typ.), and it possesses a hysteresis with respect to the supply voltage. The hysteresis width (typ.). 11) B.S. Operation of the CXA1999N can be halted by setting this pin low. This pin can be connected directly to CMOS device. The current consumption for battery saving is 20 µA or less (at 1.4 V). 14 ...
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... For the 2-level FSK demodulation, it corresponds to a conventional NRZ comparator output (When the input frequency is higher than the local frequency —13— CXA1999N The polarity can be inverted by setting the local frequency higher than the input frequency. ...
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... BUF in Fig the detector buffer amplifier, and AMP is an operational amplifier to construct an LPF. COMP is the level comparator or the NRZ comparator. The CXA1999N has a feedback loop from the comparator input to the input circuit of the detector output buffer. This equalizes the average value of the comparator input voltage to the reference voltage, with the quick charge circuit of CHG being set in the feedback loop ...
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... Filter constants of the graph above DET OUT –90 –80 –70 –60 RF input level (dBm) 2200P 39k 39k 39k 11 12 1200P 560P —15— CXA1999N S+N+D 1000 RSSI 800 RF 21.7MHz 4.8k Dev. 1.6k AUDIO 600 Matching circuit is used LO 21.245MHz –10dBm 400 V : 1.4V CC 0dB=50mVrms Data filter 2 ...
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... Filter constants of the graph above DET OUT –90 –80 –70 –60 RF input level (dBm) 4700P 68k 68k 68k 11 2700P 820P —16— CXA1999N S+N+D 1000 RSSI 800 RF 21.7MHz 4.5kHz Dev. 600Hz AUDIO 600 Matching circuit is used LO 21.245MHz –10dBm 400 0dB=50mVrms Data filter 800 Hz ...
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... Local input level vs. Mixer gain –10 –20 –30 Level comparator 1.4 1.0 0.6 0.2 0 170 200 220 250 Comparator input voltage (mV) 3.0 3.5 4.0 With IF filter load RF21.7 MHz –60 dBm Matching circuit provided Level difference between Pin 20 and Pin 3 –20 –10 0 Local input level (dBm) 270 —17— CXA1999N ...
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... NRZ comparator 1.4 1.0 0.6 0.2 0 160 180 200 Comparator input voltage (mV) Level comparator temperature vs. Threshold level 100 50 0 – –50 –100 220 240 260 280 Detector output level temperature – Temperature (° Temperature (°C) —18— CXA1999N 50 75 ...
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... M + 0.1 b=0.22 – 0.05 (0.22) 0.1 ± 0.1 DETAIL B : SOLDER NOTE: Dimension “ ” does not include mold protrusion. PACKAGE STRUCTURE PACKAGE MATERIAL LEAD TREATMENT SSOP-20P-L01 SSOP020-P-0044 LEAD MATERIAL PACKAGE MASS —19— CXA1999N + 0.2 1.25 – 0.1 0.1 b=0.22 ± 0.03 DETAIL B : PALLADIUM EPOXY RESIN SOLDER / PALLADIUM PLATING 42/COPPER ALLOY 0.1g ...