UNISONIC TECHNOLOGIES CO., LTD
UA31136
FM IF DETECTOR IC FOR
CORDLESS TELEPHONE
DESCRIPTION
The UTC
UA31136
is a low operation voltage FM IF detector IC
that includes an Oscillator, Mixer, Limiting Amplifier, Quadrature
Detector and Noise Detector, it is suitable for cordless telephone.
LINEAR INTEGRATED CIRCUIT
FEATURES
* Low operation voltage: V
CC
= 1.8 ~ 5.5V
* Excellent temperature characteristics
* High sensitivity
12dB sensitivity: 11dBµV EMF (Input 50Ω)
* High intercept point: 96dBµV (Input 50Ω)
* Quadrature detector, both ceramic and coil discriminators are
usable.
* Built-in 2nd MIX
Operating frequency: 10 ~ 100MHz
* Built-in noise detection circuit
* RSSI function
Lead-free:
UA31136L
Halogen-free: UA31136G
ORDERING INFORMATION
Normal
UA31136-P16-R
UA31136-P16-T
Ordering Number
Lead Free
UA31136L-P16-R
UA31136L-P16-T
Halogen Free
UA31136G-P16-R
UA31136G-P16-T
Package
TSSOP-16
TSSOP-16
Packing
Tape Reel
Tube
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QW-R108-008.D
Copyright © 2008 Unisonic Technologies Co., Ltd
UA31136
PIN No. PIN NAME
FUNCTION
LINEAR INTEGRATED CIRCUIT
PIN DESCRIPTION
(The values of resistor and capacitor are typical.)
INTERNAL EQUIVALENT CIRCUIT
VOLTAGE
1
2
Local oscillator input and
output terminals.
Colpitts oscillator is formed
by internal emitter follower
and external X’ tal.
And external injection is
OSC OUT
possible from pin 2 or pin 1.
OSC IN
22kΩ
1
Vcc
1.98
MIX
2
120μA
6pF
1.33
Vcc
Vcc
3
MIX output terminal.
MIX OUT Output impedance is around
1.8kΩ.
1.6kΩ
200μA
3
0.74
4
5
V
CC
IF IN
Power supply
Vcc
Vcc
33kΩ
910Ω
2.0
1.67
6
DEC
2nd IF input and decoupling
5
for bias.
Input impedance is around
6
1.8kΩ.
910Ω
10μA
1.67
7
8
INVERTER AMP input and
FIL OUT output terminals.
BPF is composed of external
capacitors and resistors.
Connected
internally
to
FIL IN rectifier circuit by coupling
capacitor.
Demodulate signal output
terminal.
Carrier leak is small as LPF
is built-in.
Output impedance is around
360Ω.
Vcc
20μA
Vcc
30pF
8
500Ω
18kΩ
7
100Ω
0.67
0.65
Vcc
100μA
330Ω
9
9
AF OUT
Vcc
Vcc
10
QUAD
Phase shift signal input
terminal of FM demodulator.
10
500Ω
2.0
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QW-R108-008.D
UA31136
PIN DESCRIPTION (Cont.)
PIN No. PIN NAME
FUNCTION
LINEAR INTEGRATED CIRCUIT
INTERNAL EQUIVALENT CIRCUIT
Vcc
VOLTAGE
11
IF OUT
Output terminal of IF AMP.
200μA
100Ω
11
1.14
Vcc
12
RSSI
This terminal outputs DC
level according to input
signal level to IF AMP.
Dynamic range is around
70dB.
The result of noise detection
is output by comparing
output voltage of N-REC
terminal
with
internal
reference. Hysteresis range
is about 100mV and output is
open collector.
12
56kΩ
13
13
N-DET
Vcc
14
N-REC
After output of INVERTER
AMP amplified around 20dB,
noise signal is rectified by
external capacitor.
GND terminal.
NOISE
COMP
14
75kΩ
15
GND
0.0
Vcc
Vcc
5kΩ
30pF
2kΩ
5kΩ
100μA
16
MIX IN
1st IF signal input terminal.
10
Input impedance is around
4kΩ at 21.7MHz.
0.94
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QW-R108-008.D
UA31136
BLOCK DIAGRAM
NOISE DET RSSI OUT
Vcc
MIX IN
+
-
CD
IF OUT
LINEAR INTEGRATED CIRCUIT
Vcc
AF OUT
16
MIX IN
15
GND
14
N-REC
13
N-DET
12
RSSI
11
10
QUAD
9
AF OUT
LPF
BPF
DE EMP
300Hz ~ 3kHz
MIX
NOISE
COMP
RECTIFIER
BUFFER
LOCAL OSC
RSSI
QUADRATURE
DETECTOR
NOISE AMP
IF AMP
INVERTER
AMP
7
8
FIL IN
FIL OUT
1
OSC IN
2
OSC OUT
3
MIX OUT
4
V
CC
5
IF IN
6
DEC
X'tal
CF1
+
-
Vcc
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QW-R108-008.D
UA31136
ABSOLUTE MAXIMUM RATINGS
(Ta = 25℃)
PARAMETER
LINEAR INTEGRATED CIRCUIT
SYMBOL
RATINGS
UNIT
Supply Voltage
V
CC
7
V
Power Dissipation
P
D
560
mW
Junction Temperature
T
J
125
℃
Operating Temperature
T
OPR
-30 ~ +85
℃
Storage Temperature
T
STG
-50 ~ +150
℃
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
ELECTRICAL CHARACTERISTICS
(V
CC
= 2.0V, f
IN (MIX)
= 21.7MHz, f
IN (IF)
= 450kHz,
∆f
= ±1.5kHz, f
MOD
= 1kHz, Ta= 25°C, unless otherwise specified.)
TEST
TEST CONDITIONS
MIN TYP MAX UNIT
PARAMETER
SYMBOL
CIRCUIT
Power Supply Voltage
V
CC
1.8
2.0
5.5
V
Noise Detection Output Voltage
V
NDET
2
I
SINK
= 0.2mA
0.1
0.5
V
High
V
TH
0.5
0.7
V
2
Noise Detection Level
0.3
0.4
Low
V
TL
V
RSSI 1
2
V
IN(IF)
= 30dBµV
200
360
520
mV
RSSI Output Voltage
V
CC
= 3V
V
RSSI 2
V
IN(IF)
= 100dBµV
2
1.4
2.0
2.6
V
Demodulation Output Level
V
OD
2
V
IN (IF)
= 80dBµV
80
100
120
mV
Current Consumption
I
Q
1
3.2
4.6
mA
Noise Detection Output Leak
I
O(LEAK)
V
NREC
= 0.6V, V
NDET
= 2V
0
5
µA
Current
IF AMP. Input Resistance
R
IN(IF)
1.2
1.8
2.4
kΩ
Mixer Output Resistance
R
O(MIX)
1.2
1.8
2.4
kΩ
R
IN (MIX)
5.5
kΩ
Mixer Input Impedance
C
IN (MIX)
2.8
pF
SN Ratio
SN
2
V
IN (IF)
= 80dBµV
43
65
dB
Rejection Ratio
RR
2
V
IN (IF)
= 80dBµV, AM = 30%
40
dB
Measured via ceramic filter.
15
18
21
dB
Mixer Conversion Gain
G
VC
2
V
IN (MIX)
= 46dBµV
Mixer Intercept Point
P
IM
Input 50Ω
96
dBµV
12dB Sensitivity
12dB SN
11
dBµV
Note: All AC levels are indicated by open lever (EMF).
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www.unisonic.com.tw
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QW-R108-008.D
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