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PDF CXA1999 Data sheet ( Hoja de datos )
| Número de pieza | CXA1999 | |
| Descripción | IF Amplifier for M-ary FSK Pagers | |
| Fabricantes | Sony Corporation | |
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IF Amplifier for M-ary FSK Pagers
CXA1999N
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.
20 pin SSOP (Plastic)
Features
• Low current consumption: 1.16 mA
(typ. at VCC = 1.4 V)
• Low voltage operation: VCC = 1.1 to 4.0 V
• Small package 20-pin SSOP
• Second mixer and oscillator
• Needless of IF decoupling capacitor
• Reference power supply for operational amplifier
and comparator
• IF input, VCC standard
Applications
• M-ary FSK pagers
• Double conversion pagers
Absolute Maximum Ratings
• Supply voltage
VCC 7.0 V
• Operating temperature
Topr –20 to +75 °C
• Storage temperature
Tstg –65 to +150 °C
• Allowable power dissipation PD
375 mW
Operating Condition
Supply voltage
VCC1 1.1 to 4.0 V
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.
—1—
E95517C8Y
1 page  
CXA1999N
Pin
Symbol
Pin voltage
No.
13 L.C. OUT
15 NRZ OUT
16 LVA OUT
—
—
—
14 CHARGE
0V
17 REG CONT
—
Equivalent circuit
72
13
15
16
GND
20k
14
100k
GND
VCC
17
72
GND
VCC
Description
Level comparator, NRZ
comparator and LVA comparator
outputs. They are open
collectors.
(Applied voltage range: –0.5 V to
+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: –0.5 V to
+7.0 V)
Output for internal constant-
voltage source amplifier.
Connect the base of PNP
transistor.
(Current capacity: 100 µA)
18 REG OUT
1.0 V
19 GND
—
20 MIX IN
1.4 V
78k
18
1k
22k
GND
4.16k 4.16k
VCC
2k
20
Constant-voltage source output.
Controlled to maintain 1.0 V.
Ground
Mixer input.
GND
—5—
5 Page 
CXA1999N
6) 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. The capacitance of the capacitor connected to Pin 7
should be chosen such that the voltage does not vary much due to discharge during battery saving.
Connect a signal for controlling the quick charge circuit to Pin 14. Setting this pin high enables the quick
charge mode, and setting this pin low enables the steady-state reception mode. Quick charge is used
when the power supply is turned on. The battery saving must be set high at the time.
Connect Pin 14 to GND when quick charge is not being used.
Power supply
(Pin number 4)
Quick charge
(Pin number 14)
Battery save
(Pin number 6)
Timing
H
L
H
L
active battery
saving
Fig. 3
7) Detector
The detector is of quadrature type. To perform phase shift, connect a ceramic discriminator to Pin 8.
The phase shifting capacitor for the quadrature detector is incorporated. The demodulated FM (FSK) signal
with the detector will be output to DET OUT (Pin 9) through the internal primary LPF.
DET OUT output impedance is 200 Ω or less. The DET OUT output is the anti-phase output to NRZ OUT.
The CDBM455C28 (MURATA MFG. CO., LTD.) ceramic discriminator is recommended for the CXA1999N.
78 9
DET OUTPUT
4.7k
Ceramic discriminator
CDBM455C28
VCC
—11—
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet CXA1999.PDF ] | |
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