cxa1884n Sony Electronics, cxa1884n Datasheet
cxa1884n
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cxa1884n Summary of contents
Page 1
... Low-voltage FM IF Amplifier Description The CXA1884N is designed for FM communication devices. They incorporate a paging system, mixer, IF limiter, FM detector, operational amplifier, comparator, and others. Features • Low operating voltage 1.0 to 4.0V • Low power consumption 2mA at 1.5V • Built-in power source voltage monitor Applications IF Amplifier for Paging System Receiver ...
Page 2
... Vcc). GND V CC Connection pin of the bypass capacitor for the IF limiter amplifier. Connect a capacitor of about 0.047µF between this pin and ground (or Vcc). GND V CC Connected to a quadrature detector phase shifter. GND – 2 – CXA1884N ...
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... Description V CC Recovered signal output. GND V CC Input pin of inverting OP amplifier A1. GND V CC Output pin of OP amplifier A1. GND V CC Input pin of OP amplifier A2. GND V CC Input pin of the comparator. This pin is internally connected to the output of OP amplifier A2. GND – 3 – CXA1884N ...
Page 4
... GND Reduces IC power consumption. Lowering pin voltage beiow 0.35V stops IC operation. GND Output pin for Low Voltage Alarm (LVA). The pin turns to high impedance when power voltage drops below 1.05V. GND Ground pin Mixer input pin. GND – 4 – CXA1884N ...
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... Test circuit 2 SEN V Test circuit 10 PML V V – V PMTH PMH PML I Test circuit 7 LLVA V Test circuit 8 SATLVA V Test circuit 3 DET V THBSV V TLBSV – 5 – CXA1884N = 2.3kHz 30%) DIV MOD Min. Typ. Max. Unit 1.2 2.0 2.6 mA — — 20 µA — 7 — dBµ 25 — — dB — ...
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... 21.7MHz V CC 1.5V RNF2 10k 10µ 0.1Vp 0.95V IN1 1.5V – 6 – CXA1884N 0.95V 7. RNF1 11 100k RNF2 100k Test circuit 0.95V ...
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... 1. 1.5V Test circuit 0.95V 200µ 1.5V Test circuit 10 – 7 – CXA1884N IS2 17 200µ 0.95V 15 14 RNF 10k 13 IS1 12 200µ 0. ( 0.95V ...
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... V AC1 L Modulation frequency 256Hz MOD Signal level 40dBµ Next modified to: AC1 Modulation frequency 256Hz MOD . AC2 Modulation frequency 256Hz MOD Signal level 50dBµ DET O when V is 0.1V, and as V2 when PMH – 8 – CXA1884N value 0.3V ...
Page 9
... ERR A2 REG DET LIM 4.7k 4.7µ (BP) or 1µ 0.047µ 0.047µ 1µ CFVM455 CDB455C3 – 9 – CXA1884N (Ta = 25°C, Vcc = 1.4V) Min. Typ. Max. Unit 1.3 1.6 1.9 — 4.0 — 1.44 1.8 2.16 1.44 1.8 2.16 — ±6 — 1.28 1.6 2.0 — — 0.39 0.05 — — ...
Page 10
... Input impedance is at 1.6k . The mixer output features a built-in 1.6k Ioad resistance at Pin filter The filter to be connected between this IC's mixer and the IF limiter should have the following specifications. I/O impedance: 1.6k ± 10% Band width: Use according to application 1 3 Ceramic filter From LOCAL SIG Fig. 1 – 10 – CXA1884N 2 3 Ceramic filter (b) ...
Page 11
... The phase capacitor of the quadrature detector is built-in. FM (FSK) signals demodulated by this detector have their high frequency components dropped by the LPF formed inside from CRs output at DET OUT (Pin 9). DET OUT output impedance is about 3k . For the CXA1884N ceramic discriminator, CDB 455 C3 (Murata Production) is recommended ...
Page 12
... When supply voltage turns low this pin turns to High (Open). Output is an open collector, and similarly as NRX OUT, can directly drive CMOS. This LVA setting voltage is at 1.05V ± 50mV with hysterisis versus supply voltage. Hysterisis width is at 50mV ± 10mV 0.2V 10 Fig 1. for CMOS CMOS IC NRZ OUT Fig. 5 – 12 – CXA1884N ...
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... BSV By turning this pin to low, this IC's operation can be stopped. This pin can also be directly connected to CMOS. Consumption current with BSV is 20µA (at 1.5V) and below. 17 BSV Fig. 6 – 13 – CXA1884N ...
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... C –40 – 1.5V 1kHz CC MOD f = ±3kHz 21.7MHz –60 DEV S –120 –110 –100 –90 –80 Mixer input signal level [dBm] 4th LP Butterworth cascade MFB constant using OP1 and OP2 inside CXA1884N MOD fc (–3dB) A1 Gain A2 Gain ...
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... LOCAL INPUT LEVEL = –10dBm –10 1M 10M 100M Input frequency [Hz] – 15 – Logical input level vs. Mixer conversion 21.245MHz – –20 B –30 OSC IN 4.0 –40 –30 –20 –10 Logical input level [dBm] CXA1884N Test the ratio between A and ...
Page 16
... This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame). 20PIN SSOP (PLASTIC) 6.5 ± 0 0.65 0.15 – 0.02 0.13 M 0° to 10° DETAIL A PACKAGE STRUCTURE PACKAGE MATERIAL LEAD TREATMENT SSOP-20P-L01 SSOP020-P-0044 LEAD MATERIAL PACKAGE MASS – 16 – CXA1884N + 0.2 1.25 – 0.1 0.1 + 0.05 0.1 ± 0.1 EPOXY RESIN SOLDER / PALLADIUM PLATING 42/COPPER ALLOY 0.1g ...