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PDF CXA3176N Data sheet ( Hoja de datos )
| Número de pieza | CXA3176N | |
| Descripción | Achieving Low Power and High Speed in Paging System IF IC | |
| Fabricantes | Sony Corporation | |
| Logotipo |  |
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CXA3176N
IF Amplifier for FM Receiver (AFC Supported)
Description
The CXA3176N is a low current consumption FM
IF amplifier which employs the newest bipolar
process. It is suitable for FM receiver using AFC.
24 pin SSOP (Plastic)
Features
• Low current consumption :
0.95 mA (typ. at VCC1=1.4 V)
0.15 mA (typ. at VCC2=3.0 V)
• Small package 24-pin SSOP
• Second mixer and oscillator
• Needless of IF decoupling capacitor
• Reference power supply for operational amplifier
• RSSI function (dynamic range of 70 dB)
• IF input, VCC standard
• AFC function
• Maximum input frequency : 30 MHz
Applications
• FM receiver supporting AFC
• Double conversion FM receiver
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
VCC1
VCC2
1.1 to 4.0
2.5 to 4.0
V
V
Structure
Bipolar silicon monolithic IC
Block Diagram and Pin Configuration
24 23 22 21 20 19 18 17 16 15 14 13
22dB
GND
MIX
OSC
REG
LVA
AFC
IF_LIM
QUAD_DET
FILTER
RSSI
×4
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—
E96X14A8Z
1 page  
CXA3176N
Electrical Characteristics
(VCC1=1.4 V, VCC2=3 V, Ta=25 °C, FS=21.7 MHz, FMOD=4 kHz, FDEV=4.5 kHz, AMMOD=30 %)
Item
Current consumption1
Current consumption2
Current consumption
AM rejection ratio
VB output current
VB output saturation voltage
REG OUT voltage
LVA operating voltage
LVA output leak current
LVA output saturation voltage
Logic input voltage high level
Logic input voltage low level
Limiting sensitivity
RSSI output offset
Mixer input resistance
Mixer output resistance
IF limiter input resistance
AMP OUT
Symbol
ICC1
ICC2
ICCS
AMRR
IOUT
VSATVB
VREG
VLVA
ILLVA
VSATLVA
VTHBSV
VTLBSV
VIN (LIM)
VORSSI
RINLIM
ROUTMIX
RINLIM
VAMP
Conditions
Measurement circuit 1, V2=1.0 V
Measurement circuit 1, V2=1.0 V
Measurement circuit 1, V2=0 V
Measurement circuit 2, 30 k LPF
Measurement circuit 3
Measurement circuit 3
Output current 0 µA
Measurement circuit 4,
V1=1.4 to 1.0 V
Measurement circuit 4, V1=1.0 V
Measurement circuit 5
—
—
Measurement circuit 2,
Data filter fc=6.2 kHz
Measurement circuit 6
—
—
—
Measurement circuit 2
Min. Typ. Max Unit
0.5 0.95 1.35 mA
— 0.15 0.25 mA
— 6 10 µA
25 — — dB
100 — — µA
— — 0.4 V
0.92 0.97 1.02 V
1.00 1.05 1.10 V
— — 2.0 µA
— — 0.4 V
0.9 — — V
— — 0.35 V
— –108 — dBm
— 150 300 mV
1.6 2.0 2.4 kΩ
1.2 1.5 1.8 kΩ
1.2 1.5 1.8 kΩ
500 630 800 mVrms
—5—
5 Page 
CXA3176N
13) AFC
The AFC is of the current output type which outputs the frequency deviation in the form of the current and
converts it to the voltage. The output current range is approximately ±0.4 µA for the slow mode and ±70
µA for the fast mode.
BUF
Vref
External parts
Vin (S curve voltage)
V=it/C
LPF
7 ×4
6
1st OSC for 1st MIX for
FM receiver FM receiver
VCO
To CXA3176N
Vref C
Vref
Vout
(AFC voltage)
RF
CXA3176N AFC Principle Diagram
The Pin 7 voltage V continues to change till the Vin value reaches the Vref value. When these values are
equal, the Pin 7 output current becomes “0” and the voltage is determined by the charge and time.
The Pin 7 voltage V is output to Pin 6 through the amplifier.
Vout=Vref+4 (V–Vref)
The Vout operating range is 0.4 V to 4 (VCC–0.2) V so that AFC should be set within this range.
Also, the voltage for Pin 7 is undefined with the IC itself.
The AFC voltage varies, for example, as shown below by the VCO characteristics. The AFC voltage
follows the VCO characteristics because this voltage is independent of the slope of the S curve. In other
words, the CXA3176N operates according to the VCO characteristics when the VCO characteristics have
the linearity with respect to the voltage and the VCO characteristics can be controlled within the range
shown in the graph below.
4 (VCC–0.2)V
0.4V
A
B
C
fo Input frequency
—11—
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet CXA3176N.PDF ] | |
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