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PDF CXA3179N Data sheet ( Hoja de datos )
| Número de pieza | CXA3179N | |
| Descripción | IF Amplifier for M-ary FSK Pagers (AFC Supported) | |
| Fabricantes | Sony Corporation | |
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CXA3179N
IF Amplifier for M-ary FSK Pagers (AFC Supported)
Description
The CXA3179N is a low current consumption FM
IF amplifier which employs the newest bipolar
process. It is suitable for M-ary FSK pagers using
AFC.
24 pin SSOP (Plastic)
Features
• Low current consumption : 1.1 mA
(typ. at VCC=1.4 V)
• Low voltage operation : VCC=1.1 to 4.0 V
• Small package 24-pin SSOP
• Second mixer and oscillator
• Needless of IF decoupling capacitor
• Reference power supply for operational amplifier
and comparator
• Bit rate filter with variable cut-off
• AFC current output circuit
• RSSI function
• IF input, VCC standard
• Maximum input frequency : 30 MHz
Absolute Maximum Ratings
• Supply voltage
VCC
• Operating temperature Topr
• Storage temperature Tstg
• Allowable power dissipation
PD
7.0
–20 to +75
–65 to +150
V
°C
°C
417 mW
Operating Condition
Supply voltage
VCC 1.1 to 4.0
V
Applications
• M-ary FSK pagers
• Double conversion pagers
Structure
Bipolar silicon monolithic IC
Block Diagram and Pin Configuration
24 23 22 21 20 19 18 17 16 15 14 13
GND
MIX
OSC
REG
LVA
AFC
IF_LIM
LEVEL
COMP
QUAD_DET
FILTER
RSSI
1 2 3 4 5 6 7 8 9 10 11 12
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—
E96Y06A8Z
1 page  
CXA3179N
Electrical Characteristics
(VCC=1.4 V, Ta=25 °C, FS=21.7 MHz, FMOD=1.6 kHz, FDEV=4.8 kHz, AMMOD=30 %)
Item
Current consumption
Current consumption
AM rejection ratio
NRZ output saturation voltage
NRZ output leak current
NRZ hysteresis width
VB output current
VB output saturation voltage
REG OUT voltage
LVA operating voltage
LVA output leak current
LVA output saturation voltage
Detector output voltage
Logic input voltage high level
Logic input voltage low level
Limiting sensitivity
Detector output level ratio
deviation to level comparator
window width
Level comparator
output saturation voltage
Level comparator
output leak current
RSSI output offset
Mixer input resistance
Mixer output resistance
IF limiter input resistance
Symbol
ICC
ICCS
AMRR
VSATNRZ
ILNRZ
VTWNRZ
IOUT
VSATVB
VREG
VLVA
ILLVA
VSATLVA
VODET
VTHBSV
VTLBSV
VIN (LIM)
VLCWR
VSATLC
ILLC
VORSSI
RINLIM
ROUTMIX
RINLIM
Conditions
Measurement circuit 1, V2=1.0 V
Measurement circuit 1, V2=0 V
Measurement circuit 2, 30 k LPF
Measurement circuit 4, Vin=0.3 V
Measurement circuit 3, Vin=0.1 V
Measurement circuit 3,
Vin=0.1 to 0.3 V
Measurement circuit 5
Measurement circuit 5
Output current 0 µA
Measurement circuit 6,
V1=1.4 to 1.0 V
Measurement circuit 6, V1=1.0 V
Measurement circuit 7
Measurement circuit 2
—
—
Measurement circuit 2,
Data filter fc=2.4 kHz
When Pin 6 is shorted to VCC
Measurement circuit 9
Measurement circuit 8
Measurement circuit 10
—
—
—
Min. Typ. Max. Unit
0.7 1.1 1.35 mA
— 6 10 µA
25 — — dB
— — 0.4 V
— — 5.0 µA
0 10 20 mV
100 — —
— — 0.4
0.95 1.00 1.05
µA
V
V
1.00 1.05 1.10 V
— — 2.0 µA
— — 0.4 V
50 63 80 mVrms
0.9 — — V
— — 0.35 V
— –108 — dBm
–15 0 +15 %
— — 0.4 V
— — 2.0 µA
— 150 300 mV
1.6 2.0 2.4 kΩ
1.2 1.5 1.8 kΩ
1.2 1.5 1.8 kΩ
—5—
5 Page 
CXA3179N
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 FM (FSK) signal
demodulated with the detector will be output to AUDIO (Pin 16) through the internal LPF.
The AUDIO output is the anti-phase output to the NRZ OUT.
The CDBM455C50 (MURATA MFG. CO., LTD.) ceramic discriminator is recommended for the CXA3179N.
For the 2-level system, the CDBM455C28 can also be used.
7 89
6.5k
Ceramic
discriminator
CDBM455C50
VCC
Fig. 4
The detector output level is changed according to the resistance value connected to Pin 8.
8) Filter Buffer, Level Comparator and NRZ Comparator
The LPF circuit is built in this IC.
The LPF output is connected internally to the NRZ comparator, level comparator and quick charge circuit.
19 16 15
L.C.
LPF
0.2V
DET
7
Fig. 5
Using the LPF, remove the noise from the demodulated signal and input the signal to the above three
circuits.
—11—
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet CXA3179N.PDF ] | |
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