Sony CXA3179N Datasheet
—1—
E96Y06A8Z
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 VCC 1.1 to 4.0 V
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.
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
Applications
• M-ary FSK pagers
• Double conversion pagers
Structure
Bipolar silicon monolithic IC
Block Diagram and Pin Configuration
IF Amplifier for M-ary FSK Pagers (AFC Supported)
24 pin SSOP (Plastic)
CXA3179N
OSC
MIX
REG
LVA
IF_LIM
AFC
QUAD_DET
RSSI
FILTER
GND
LEVEL
COMP
20 19 18 17 16 15 14 1324 23 22 21
1 2 3 4 5 6 7 8 9 121110
OSC IN
OSC OUT
MIX OUT
V
CC
IF IN
AFC
QUAD
C1
C2
C3
FIL SW
TH CONT
MIX IN
GND
REG OUT
REG CONT
LVA OUT
B.S.
AUDIO
RSSI
NRZ OUT
AFC C.
AFC OFF
L.C. OUT
—2—
CXA3179N
Pin Description
Pin
Symbol
Pin
Equivalent circuit Description
No. voltage
1
2
3
4
5
6
7
8
OSC IN
OSC OUT
MIX OUT
VCC
IF IN
TH CONT
AFC
QUAD
1.4 V
0.7 V
1.3 V
1.4 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 455 kHz ceramic filter
between this pin and IF IN.
Power supply.
IF limiter amplifier input.
Determines the level comparator
threshold value.
Threshold value can be adjusted by
inserting the resistor between Pin 6 and
VCC.
Normally, short to VCC.
AFC current output.
Connects the phase shifter of FM
detector circuit.
VCC
300
15k
GND
72
15k
2
1
3
VCC
GND
1.5k
VCC
1.5k
GND
1.5k520k 20k
VCC
GND
6
25k
VCC
GND
7
72
8
VCC
22k
GND
20p
20k
—3—
CXA3179N
Pin
Symbol
Pin
Equivalent circuit Description
No. voltage
9
10
11
12
13
14
15
19
20
16
C1
C2
C3
FIL SW
RSSI
AFC OFF
L.C. OUT
NRZ OUT
LVA OUT
AUDIO
0.2 V
—
0.1 V
—
—
—
—
0.2 V
Connects the capacitor that determines
the LPF cut-off.
Switches the LPF cut-off.
Cut-off is decreased by setting this pin
high.
(Applied voltage range :
–0.5 V to +7.0 V)
RSSI circuit output.
Sets off the AFC circuit current.
The AFC current is off by setting Pin 18
low and Pin 14 high.
Level comparator, NRZ comparator
and LVA comparator outputs. They are
open collectors.
(Applied voltage range :
–0.5 V to +7.0 V)
Level comparator and NRZ comparator
inputs.
The filter circuit output is connected.
72
20k
140k
GND
12
VCC
GND
13
7k 7k
70k
72
20k
100k
GND
14
VCC
GND
10
11
9
35k
50k
72
GND
15
19
20
VCC
GND
16
72
72
—4—
CXA3179N
Pin
Symbol
Pin
Equivalent circuit Description
No. voltage
17
18
21
22
23
24
B.S.
AFC C.
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)
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
21
VCC
GND
72
VCC
GND
78k
1k
22k
22
VCC
GND
2k
4.16k
4.16k
24
—5—
CXA3179N
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
Electrical Characteristics
(VCC=1.4 V, Ta=25 °C, FS=21.7 MHz, FMOD=1.6 kHz, FDEV=4.8 kHz, AMMOD=30 %)
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
—
—
—
Typ.
1.1
6
—
—
—
10
—
—
1.00
1.05
—
—
63
—
—
–108
0
—
—
150
2.0
1.5
1.5
Max.
1.35
10
—
0.4
5.0
20
—
0.4
1.05
1.10
2.0
0.4
80
—
0.35
—
+15
0.4
2.0
300
2.4
1.8
1.8
Unit
mA
µA
dB
V
µA
mV
µA
V
V
V
µA
V
mVrms
V
V
dBm
%
V
µA
mV
kΩ
kΩ
kΩ
Min.
0.7
—
25
—
—
0
100
—
0.95
1.00
—
—
50
0.9
—
—
–15
—
—
—
1.6
1.2
1.2
—6—
CXA3179N
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
20 19 18 17 16 15 14 1324 23 22 21
A
V2
1 2 3 4 5 6 7 8 9 10 1211
VCC
V1
1.4V
V2
1V
V
20 19 18 17 16 15 14 1324 23 22 21
A
100k
1 2 3 4 5 6 7 8 9 10 1211
Vin
VCC
V1
1.4V
V2
1V
GND
V3
0.5V
GND
V
20 19 18 17 16 15 14 1324 23 22 21
100µA
1 2 3 4 5 6 7 8 9 10 1211
22p
15p
1µ 8.2k
1200p
1200p
1200p
V
CC
V1
1.4V
1000p
10p to
120p
Vin
1.8µ
V2
1V
V
20 19 18 17 16 15 14 1324 23 22 21
1 2 3 4 5 6 7 8 9 10 1211
VCC
V1
1.4V
V2
1V
V
20 19 18 17 16 15 14 1324 23 22 21
50µA
1 2 3 4 5 6 7 8 9
10 1211
Vin
VCC
V2
1V
V
20 19 18 17 16 15 14 1324 23 22 21
A
100k
1 2 3 4 5 6 7 8 9 10 1211
V1
1.4 to 1.0V
—7—
CXA3179N
Measurement circuit 8
Measurement circuit 10
Measurement circuit 7
Measurement circuit 9
VCC
V1
1.4V
V2
1V
V
20 19 18 17 16 15 14 1324 23 22 21
50µA
1 2 3 4 5 6 7 8 9
10 1211
VCC
V1
1.4V
V2
1V
V
20 19 18 17 16 15 14 1324 23 22 21
50µA
1 2 3 4 5 6 7 8 9
10 1211
Vin
0.1V
VCC
V1
1.4V
V2
1V
V
20 19 18 17 16 15 14 1324 23 22 21
A
100k
1 2 3 4 5 6 7 8 9 10 1211
Vin
0.2V
VCC
V2
1V
V1
1.4V
V
100P
20 19 18 17 16 15 14 1324 23 22 21
1 2 3 4 5 6 7 8 9 10 1211
—8—
CXA3179N
Application Circuit
GND
OSC
MIX
REG
LVA
IF_LIM
AFC
QUAD_DET
RSSI
FILTER
GND
RF SMA
10P to 120P
1.8µH
GND
1000P
GND
10µ
PNP
P7
REG
S4
100k
P6
LVA
GND
S3
P4
P3
RSSI
BS AUDIOVB_REG
P1
VCC
DISK
1µ
P9
AFC
CERAFIL
GND
10µ
0.01µ
15P
XTAL
22P
LEVEL
COMP
FIL SW
COMP
OUT
AFC
OFF
AFC C.
NRZ
COMP
C3
L1
C1
C6
R5
100k
P5
NRZ
R6
220
R4
100k
R8
LEVEL
GND
S2
GND
1000P
C14
S1
GND
C13
GND
P2
AUDIO
680P
C12
C11
GND
6.8K
R7
C10
GND
1 2 3 4 5 6 7 8 9
121110
C8
C7
C4
C5
20 19 18 17 16 15 14 1324 23 22 21
GND
C6
0.01µ
GND
P8
GND
GND
1100P
(100P+1000P)
1420P
(1200P+220P)
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.
—9—
CXA3179N
Application Notes
1) Power Supply
The CXA3179N, with built-in regulator, is designed to permit stable operation at a wide range of supply
voltage from 1.1 to 4.0 V. Decouple the wiring to VCC (Pin 4) as close to the pin as possible.
2) Oscillator Input
Oscillator input method
a) Using Pins 1 and 2, input a self-excited oscillation signal through the composition of a Colpitts type
crystal oscillator circuit.
b) Directly input a local oscillation signal to Pin 1.
3) Mixer
The mixer is of double-balance type. Pin 24 is the input pin. Input though a suitable matching circuit. The
input impedance is 2.0 kΩ.
Pin 3 serves as the output pin for the mixer, and a load resistance of 1.5 kΩ is incorporated.
4) IF Filter
The filter to be connected between this mixer output and the IF limiter amplifier input should have the
following specifications.
I/O impedance : 1.5 kΩ ±10 %
Band width : Changes according to applications.
5) IF Limiter Amplifier
The gain of this IF limiter amplifier is approximately 100 dB. Take notice of the following points in making
connection to the IF limiter amplifier input pin (Pin 5).
a) Wiring to the IF limiter amplifier input (Pin 5) should be as short as possible.
b) As the IF limiter amplifier output appears at QUAD (Pin 8), wiring to the ceramic discriminator
connected to QUAD should be as short as possible to reduce the interference with the mixer output and
IF limiter amplifier input.
1 2 3
VCC
Ceramic
filter
1 2 3
From
local signal
Ceramic
filter
Fig. 1
VCC
3 4 5 6 7 8 9
Wire as short and apart as possible As short as possible
Fig. 2
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