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| CXA1994AM/BM M-ary FSK Demodulating Comparator For the availability of this product, please contact the sales office. Description The CXA1994AM/BM is a comparator which allows the M-ary (4-level) FSK data to be demodulated in combination with an FM IF amplifier for pagers. Features * Low power consumption 70A (at VCC = 1.4V, including the current on battery saving control pin) * Low voltage operation VCC = 1.0 to 4.0V Applications M-ary FSK pagers Function * Window comparator for MSB detection * Battery saving control pin * Threshold level adjustment pin 8 pin SOP (Plastic) Absolute Maximum Ratings (Ta = 25C) * Supply voltage VCC 7.0 * Operating temperature Topr -20 to +75 * Storage temperature Tstg -65 to +150 Operating Conditions * Supply voltage V C C VCC 1.0 to 4.0 V Block Diagram GND B.S. 8 7 6 1 2 3 DATA IN Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits. TH CONT REF VCC DATA OUT 5 4 NC -1- E96428A8Y CXA1994AM/BM Pin Description Pin No. 1 Symbol VCC Pin voltage 1.5V VCC Equivalent circuit Vcc. Description 2 TH CONT -- 2 Adjusts the threshold level for comparator. GND VCC 3 DATA IN 0.2V 3 Signal input. Connected to the COMP IN pin of the CXA1484A. GND 4 REF 0.2V 4 Reference input. Connected to the SENSE pin of the CXA1484A. 5 5 DATA OUT -- GND Comparator output. 6 7 NC GND -- 0 VCC Ground. 8 B.S. -- 8 Battery saving control. GND -2- CXA1994AM/BM Electrical Characteristics Item Current consumption Current consumption Comparator input voltage high level Comparator input voltage low level Comparator output saturation voltage Logic input voltage high level Logic input voltage low level Symbol ICC ICCS VCOMPH VCOMPL Vsat VTHH VTHL 0.9 VREF as a reference VREF as a reference Condition (VCC = 1.4V, Ta = 25C) Min. Typ. 70 Max. 100 6 50 -50 0.4 Unit A A mV mV V V 0.35 V Pin Description 1. VCC 2. TH CONT Power supply pin of 1V or more This pin adjusts the threshold level and the default is approximately 50mV from the reference voltage. The threshold level can be set lower by inserting a resistor between VCC and this pin. (The level cannot be set higher.) The signal after passing through the data filter of the IF IC (CXA1484A) is input. Connects to the reference voltage pin of the IF IC. (Pin 15 of the CXA1484A) Comparator output. Not connected. Ground. Battery saving control pin. Battery saving state for low; normal operation for high. 3. DATA IN 4. REF 5. DATA OUT 6. NC 7. GND 8. B.S. -3- CXA1994AM/BM Electrical Characteristics Measurement Circuit B.S. control DATA OUT 8 7 6 5 CXA1994AM/BM 1 VCC 1V to 4V 2 3 4 REF [from REF (0.2V) IF of IC] 0.01 1 5.1k DATA IN [from DATA (DC 0.2V) of IF IC] The comparator level can be set lower by inserting a resistor between Pin 1 (VCC) and Pin 2. -4- Application Circuit LVA OUT REG OUT NRZ OUT DATA OUT C2 10p to 120p S1 C8 10 BS R2 47k C10 2200P GND 12 11 8 LVA VB REG NRZ COMP CHARGE REG QUAD DET IF LIM 1 2 3 5 7 8 C9 10 CERAFIL GND R6 33k 6 4 9 R10 43k Ceramic Discriminator R9 43k 10 C12 2200p R12 43k C14 10 C15 0.01 2 OP AMP OP AMP 7 GND 18 17 16 15 14 GND 13 R5 47k R8 43k R11 43k R7 43k C13 0.01 C16 0.1 GND A S PNP L1 1.8 C3 0.01 R4 GND 75k SENSE R3 22k R14 47k 20 GND 19 6 5 -5- C6 10 S GND GND C7 0.01 F S2 MIX OSC 3 4 1 C4 22p XTAL C5 15p VCC = 1.0 to 4.0 C11 0.01 GND CXA1994AM/BM GND CXA1484A CXA1994AM/BM Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. CXA1994AM/BM Description of Operation M-ary (M = 2- or 4-level) FSK emodulation system Polarity discrimination output and MSB comparator output are used to demodulate the 4-level waveform shown below. 4-level FSK demodulating waveform +4.8kHz +1.6kHz 01 00 10 11 01 10 00 -1.6kHz -4.8kHz Polarity discrimination output POS 0 0 1 1 0 1 0 NEG MSB comparator output 1.6kHz 1 4.8kHz 0 0 1 1 0 0 The 4-level FSK demodulating data is divided into a polarity discrimination output and a MSB comparator output shown above. Here, the polarity discrimination output corresponds to a conventional NRZ comparator output. The MSB comparator output is made comparing to the optional level setting between MSB and LSB levels as reference. For the 2-level FSK demodulation, it corresponds to a conventional NRZ comparator output. Take care that the polarity of NRZ output is inverted in CXA1484A. -6- CXA1994AM/BM Example of Representative Characteristics Threshold level change 50 VCC = 1.4V 40 30 H L threshold level 20 L H threshold level Threshold level [mV] 10 0 -10 L H threshold level -20 -30 H L threshold level -40 -50 10 20 30 40 Resistance between Pins 1 and 2 [k] Threshold level temperature characteristics 80 60 40 H L threshold level VCC = 1.4V Threshold level [mV] L H threshold level 20 0 -20 L H threshold level -40 -60 -80 H L threshold level -20 0 20 Temperature [C] 40 60 80 -7- CXA1994AM/BM Package Outline CXA1994AM Unit : mm 8PIN SOP (PLASTIC) + 0.4 1.25 - 0.15 + 0.4 5.0 - 0.1 8 5 A 0.10 + 0.3 4.4 - 0.1 1 4 1.27 b 0.24 M 0 to 10 (0.15) + 0.1 0.15 - 0.05 b = 0.4 0.03 + 0.03 0.15 - 0.01 + 0.1 b = 0.4 - 0.05 (0.4) DETAILA DETAIL B : SOLDER DETAIL B : PALLADIUM PACKAGE STRUCTURE PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE SOP-8P-L03 SOP008-P-0225 LEAD TREATMENT LEAD MATERIAL PACKAGE MASS EPOXY RESIN SOLDER/PALLADIUM PLATING 42/COPPER ALLOY 0.1g NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame). CXA1994BM + 0.4 6.1 - 0.1 8PIN SOP (PLASTIC) 300mil + 0.4 1.85 - 0.15 8 5 0.15 + 0.2 0.1 - 0.05 + 0.3 5.3 - 0.1 7.9 0.4 1 0.45 0.1 4 + 0.1 0.2 - 0.05 1.27 6.9 0.12 M PACKAGE STRUCTURE PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE SOP-8P-L01 SOP008-P-0300-A LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT EPOXY RESIN SOLDER PLATING COPPER / 42 ALLOY 0.1g -8- 0.5 0.2 0.5 0.2 B 6.4 0.4 + 0.15 0.1 - 0.1 |
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