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PDF CXA3117 Data sheet ( Hoja de datos )
| Número de pieza | CXA3117 | |
| Descripción | Achieving Low Power and High Speed in Paging System IF IC | |
| Fabricantes | Sony Corporation | |
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CXA3117AN
IF Amplifier for M-ary FSK Pagers
Description
The CXA3117AN is a low current consumption FM
IF amplifier which employs the newest bipolar
process. It is suitable for M-ary FSK pagers.
24 pin SSOP (Plastic)
Features
• Low current consumption: 1.1mA
(typ. at VCC = 1.4V)
• Low voltage operation: VCC = 1.1 to 4.0V
• 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
• Misoperation prevention function for continuous data
• RSSI function
• IF input, VCC standard
• Quick charge by the detector output sense method
Applications
• M-ary FSK pagers
• Double conversion pagers
Structure
Bipolar silicon monolithic IC
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
417 mW
Operating Condition
Supply voltage
VCC 1.1 to 4.0 V
Block Diagram and Pin Configuration
24 23 22 21 20 19 18
GND
MIX
OSC
12 3
REG
LVA
CHARGE
IF_LIM
45 67
17 16 15 14 13
LEVEL
COMP
RSSI
QUAD_DET
FILTER
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–
E97220A8Z
1 page  
CXA3117AN
Pin
No.
Symbol
Pin
voltage
24 MIX IN
1.4V
Equivalent circuit
2k
4.16k 4.16k
VCC
24
Description
Mixer input.
GND
Electrical Characteristics
(VCC = 1.4V, Ta = 25°C, Fs = 21.7MHz, FMOD = 1.6kHz, FDEV = 4.8kHz, AMMOD = 30%)
Item
Symbol
Conditions
Min. Typ. Max. Unit
Current consumption
ICC Measurement circuit 1, V2 = 1.0V 0.7 1.1 1.35 mA
Current consumption
ICCS Measurement circuit 1, V2 = 0V — 6 10 µA
AM rejection ratio
AMRR Measurement circuit 2, 30k LPF
25 — — dB
NRZ output saturation voltage VSATNRZ Measurement circuit 4, Vin = 0.3V — — 0.4 V
NRZ output leak current
ILNRZ
Measurement circuit 3, Vin = 0.1V — — 5.0 µA
NRZ hysteresis width
VTWNRZ
Measurement circuit 3,
Vin = 0.1 to 0.3V
0 10 20 mV
VB output current
IOUT Measurement circuit 5
100 — — µA
VB output saturation voltage VSATVB Measurement circuit 5
— — 0.4 V
REG OUT voltage
VREG
Output current 0µA
0.95 1.00 1.05 V
LVA operating voltage
VLVA
Measurement circuit 6,
V1 = 1.4 to 1.0V
1.05 1.10 1.15 V
LVA output leak current
ILLVA
Measurement circuit 6, V1 = 1.0V — — 5.0 µA
LVA output saturation voltage VSATLVA Measurement circuit 7
— — 0.4 V
Detector output voltage
VODET
Measurement circuit 2
50 63 80 mVrms
Logic input voltage high level VTHBSV
— 0.9 — — V
Logic input voltage low level VTLBSV
— — — 0.35 V
Limiting sensitivity
VIN (LIM)
Measurement circuit 2,
Data filter fc = 2.4kHz
— –108 — dBm
Detector output level ratio
deviation to level comparator
window width
VLCWR
When Pin 6 is shorted to Vcc
–15 0 +15 %
Level comparator output
saturation voltage
VSATLC Measurement circuit 9
— — 0.4 V
Level comparator output leak
current
ILLC
Measurement circuit 8
— — 5.0 µA
RSSI output offset
Mixer input resistance
Mixer output resistance
IF limiter input resistance
VORSSI
RINLIM
ROUTMIX
RINLIM
Measurement circuit 10
—
—
—
— 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 
CXA3117AN
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 is output to AUDIO (Pin 16) through the internal primary 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 CXA3117AN.
For the 2-level system, the CDBM455C28 can also be used.
78 9
6.8k
VCC
Ceramic
discriminator
CDBM455C50
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 noise from the demodulated signal and input the signal to the above three circuits.
– 11 –
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet CXA3117.PDF ] | |
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