Sony CXA3176N Datasheet
—1—
E96X14A8Z
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.
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 VCC1 1.1 to 4.0 V
VCC2 2.5 to 4.0 V
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.
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
Structure
Bipolar silicon monolithic IC
Block Diagram and Pin Configuration
IF Amplifier for FM Receiver (AFC Supported)
24 pin SSOP (Plastic)
CXA3176N
OSC
MIX
REG
LVA
IF_LIM
AFC
×4
QUAD_DET
22dB
RSSI
FILTER
GND
1 2 3 4 5 6 7 8 9 121110
OSC IN
OSC OUT
MIX OUT
V
CC
1
IF IN
AFC
AFC_C
QUAD
C1
C2
C3
RSSI_C
MIX IN
GND
REG OUT
REG CONT
LVA OUT
V
CC
2
CHARGE
B.S.
AUDIO
NC
AMP_OUT
RSSI
20 19 18 17 16 15 14 1324 23 22 21
—2—
CXA3176N
Pin Description
Pin
Symbol
Pin
Equivalent circuit Description
No. voltage
1
2
3
4
5
6
7
OSC IN
OSC OUT
MIX OUT
VCC1
IF IN
AFC
AFC_C
1.4 V
0.7 V
1.3 V
1.4 V
—
—
Connects the external parts of crystal
oscillator circuit.
A capacitor and crystal oscillator are
connected to these pins and VCC.
Mixer output.
Connect a 450 kHz ceramic filter
between this pin and IF IN.
Power supply 1.
IF limiter amplifier input.
AFC output.
Connects the capacitor that becomes
the AFC time constant.
VCC
300
15k
GND
72
15k
2
1
3
VCC
GND
1.5k
VCC
1.5k
GND
1.5k520k 20k
VCC
GND
6
7
—3—
CXA3176N
Pin
Symbol
Pin
Equivalent circuit Description
No. voltage
8
9
10
11
12
13
14
15
16
QUAD
C1
C2
C3
RSSI_C
RSSI
AMP OUT
NC
AUDIO
1.4 V
0.2 V
0.1 V
0.1 V
VCC2/2
—
0.2 V
Connects the phase shifter of FM
detector circuit.
Connects the capacitor that determines
the LPF cut-off.
Connects the capacitor that determines
the RSSI rising characteristics.
RSSI circuit output.
Output for the detector output
amplification circuit.
Not connected.
Input for the detector output
amplification circuit and AFC circuit.
The filter circuit output is connected.
8
VCC
22k
GND
20p
20k
VCC
GND
10
11
9
35k
VCC
GND
12
13
VCC
GND
14
VCC
GND
16
—4—
CXA3176N
Pin
Symbol
Pin
Equivalent circuit Description
No. voltage
17
18
19
20
21
22
23
24
B.S.
CHARGE
VCC2
LVA OUT
REG
CONT
REG OUT
GND
MIX IN
—
—
—
—
—
1.0 V
—
1.4 V
Controls the battery saving.
Setting this pin low suspends the
operation of IC.
(Applied voltage range :
–0.5 V to +7.0 V)
Controls the time constant of the AFC
circuit.
Set this pin high to make the short time
constant.
(Applied voltage range:
–0.5 V to +7.0 V)
Power supply 2.
LVA comparator output.
It is open collectors.
(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)
Constant-voltage source output.
Controlled to maintain 1.0 V.
Ground
Mixer input.
20k
100k
GND
18
72
20k
140k
GND
17
72
GND
20
21
VCC
GND
72
VCC
GND
78k
1k
22k
22
VCC
GND
2k
4.16k
4.16k
24
—5—
CXA3176N
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
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 %)
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
Typ.
0.95
0.15
6
—
—
—
0.97
1.05
—
—
—
—
–108
150
2.0
1.5
1.5
630
Max
1.35
0.25
10
—
—
0.4
1.02
1.10
2.0
0.4
—
0.35
—
300
2.4
1.8
1.8
800
Unit
mA
mA
µA
dB
µA
V
V
V
µA
V
V
V
dBm
mV
kΩ
kΩ
kΩ
mVrms
Min.
0.5
—
—
25
100
—
0.92
1.00
—
—
0.9
—
—
—
1.6
1.2
1.2
500
—6—
CXA3176N
Electrical Characteristics Measurement Circuit
Measurement circuit 2
Measurement circuit 4
Measurement circuit 6
Measurement circuit 1
Measurement circuit 3
Measurement circuit 5
VCC
V1
1.4V
V3
3.0V
20 19 18 17 16 15 14 1324 23 22 21
A
A
V2
V
V4
1 2 3 4 5 6 7 8 9 10 1211
VCC
V1
1.4V
V3
3V
V2
1.0V
GND
V3
0.5V
GND
V
20 19 18 17 16 15 14 1324 23 22 21
1 2 3 4 5 6 7 8 9 10 1211
100µA
VCC
V3
3V
V2
1.0V
1 2 3 4 5 6 7 8 9 10 1211
V
V1
1.4V
50µA
20 19 18 17 16 15 14 1324 23 22 21
22p
15p
1µ 5.6k
1200p
1200p
1200p
1 2 3 4 5 6 7 8 9 10 1211
V
CC
V1
1.4V
1000p
10p to
120p
Vin
1.8µ
V3
3.0VV21.0V
V
20 19 18 17 16 15 14 1324 23 22 21
VCC
V3
3V
V2
1.0V
V1
1.4 to 1.0V
1 2 3 4 5 6 7 8 9 10 1211
V
100k
A
20 19 18 17 16 15 14 1324 23 22 21
VCC
V3
3V
V2
1.0V
V1
1.4V
100p
1 2 3 4 5 6 7 8 9 10 1211
V
20 19 18 17 16 15 14 1324 23 22 21
—7—
CXA3176N
Application Circuit
GND
OSC
MIX
REG
LVA
IF_LIM
AFC
×4
QUAD_DET
22dB
RSSI
FILTER
GND
RF SMA
10P to 120P
1.8µH
GND
1000P
GND
GND
10µ
PNP
P7
REG
S2
100k
P6
LVA
GND
S1
P5
V
CC
2
10µ
GND
0.01µ
P4
AMP_OUT
P3
RSSI
BS AUDIOVB_REG
100P
GND
470P
GND
470P
470P
GND
P1
V
CC
GND
DISK
5.6K
1µ
P2
AFC
CERAFIL
GND
10µ
0.01µ
1 2 3 4 5 6 7 8 9
121110
15P
XTAL
22P
20 19 18 17 16 15 14 1324 23 22 21
C2
L1
C3
C6
R4
C9
C10
C15
C14
C13
C12
C11
R5
C8
C7
C5
C4
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for
any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
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