CXA1999

Manufacturer Part NumberCXA1999
DescriptionIF Amplifier for M-ary FSK Pagers
ManufacturerSONY [Sony Corporation]
CXA1999 datasheet
 


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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. It is suitable for M-ary FSK pagers.
Features
• Low current consumption: 1.16 mA
(typ. at V
= 1.4 V)
CC
• Low voltage operation: V
= 1.1 to 4.0 V
CC
• Small package 20-pin SSOP
• Second mixer and oscillator
• Needless of IF decoupling capacitor
• Reference power supply for operational amplifier
and comparator
• IF input, V
standard
CC
Applications
• M-ary FSK pagers
• Double conversion pagers
Structure
• Bipolar silicon monolithic IC
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.
CXA1999N
20 pin SSOP (Plastic)
Absolute Maximum Ratings
• Supply voltage
• Operating temperature
• Storage temperature
• Allowable power dissipation P
Operating Condition
Supply voltage
—1—
V
7.0
V
CC
Topr –20 to +75 °C
Tstg –65 to +150 °C
375
mW
D
V
1
1.1 to 4.0
V
CC
E95517C8Y

CXA1999 Summary of contents

  • Page 1

    ... 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 40k 140k GND GND —3— CXA1999N Description Connects the external parts of crystal oscillator circuit. A capacitor and crystal oscillator are connected to these pins and Mixer output. Connect a 455 kHz ceramic filter between this pin and IF IN. ...

  • Page 4

    ... GND 70k GND GND GND —4— CXA1999N Description Connects the phase shifter of FM detector circuit. FM detector output. RSSI circuit output. Operational amplifier input. Level comparator and NRZ comparator inputs. Output for operational amplifier is connected. ...

  • Page 5

    ... GND 4.16k 4.16k GND —5— CXA1999N Description Level comparator, NRZ comparator and LVA comparator outputs. They are open collectors. (Applied voltage range: –0 +7.0 V) Controls the ON/OFF operation of the quick-charge circuit. Set this pin high to execute the quick charge. (Applied voltage range: – ...

  • Page 6

    ... CXA1999N = 30 %) Unit mA µ mVp-p V µA mV µ µA V mVrms V V dBµ V µA mV kΩ kΩ kΩ ...

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    ... CXA1999N ...

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    ... CXA1999N ...

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    ... CXA1999N ...

  • Page 10

    ... 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 ...

  • Page 11

    ... 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 ...

  • Page 12

    ... 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). 15 ...

  • Page 13

    ... For the 2-level FSK demodulation, it corresponds to a conventional NRZ comparator output. +4.8kHz +1.6kHz –1.6kHz –4.8kHz (When the input frequency is higher than the local frequency —13— The polarity can be inverted by setting the local frequency higher than frequency CXA1999N the input ...

  • Page 14

    ... 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 ...

  • Page 15

    ... Filter constants of the graph above DET OUT –90 –80 –70 –60 RF input level (dBm) 2200P 39k 39k 39k 11 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 ...

  • Page 16

    ... 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 ...

  • Page 17

    ... Level comparator 1.4 1.0 0.6 0.2 0 170 200 220 Comparator input voltage (mV) 3.0 3.5 4.0 Local input level vs. Mixer gain –20 –10 Local input level (dBm) 250 270 —17— CXA1999N With IF filter load RF21.7 MHz –60 dBm Matching circuit provided Level difference between Pin 20 and Pin 3 0 ...

  • Page 18

    ... 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 –25 0 Temperature (° Temperature (°C) —18— CXA1999N ...

  • Page 19

    ... DETAIL B : SOLDER NOTE: Dimension “ ” does not include mold protrusion. PACKAGE STRUCTURE DETAIL A PACKAGE MATERIAL LEAD TREATMENT SSOP-20P-L01 SSOP020-P-0044 LEAD MATERIAL PACKAGE MASS —19— + 0.2 1.25 – 0.1 0.1 A b=0.22 ± 0.03 DETAIL B : PALLADIUM EPOXY RESIN SOLDER / PALLADIUM PLATING 42/COPPER ALLOY 0.1g CXA1999N ...