UNISONIC TECHNOLOGIES CO., LTD
UA31136
LINEAR INTEGRATED CIRCUIT
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.
FEATURES
* Low operation voltage: VCC = 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
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Copyright © 2008 Unisonic Technologies Co., Ltd
Package
Packing
TSSOP-16
TSSOP-16
Tape Reel
Tube
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QW-R108-008.D
UA31136
LINEAR INTEGRATED CIRCUIT
PIN DESCRIPTION (The values of resistor and capacitor are typical.)
PIN No. PIN NAME
1
2
FUNCTION
INTERNAL EQUIVALENT CIRCUIT
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
Vcc
22kΩ
1.98
1
MIX
6pF
2
120μA
1.33
Vcc
3
4
MIX output terminal.
MIX OUT Output impedance is around
1.8kΩ.
VCC
Vcc
1.6kΩ
6
7
8
9
IF IN
DEC
200μA
Power supply
2.0
Vcc
2nd IF input and decoupling 5
for bias.
Input impedance is around
6
1.8kΩ.
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.
AF OUT
QUAD
1.67
10μA
1.67
910Ω
Vcc
Vcc
20μA
0.67
30pF
7
8
500Ω
Phase shift signal input
terminal of FM demodulator.
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100Ω
18kΩ
0.65
Vcc
Demodulate signal output
terminal.
Carrier leak is small as LPF
is built-in.
Output impedance is around
360Ω.
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33kΩ
910Ω
100μA
9
330Ω
Vcc
10
0.74
3
Vcc
5
VOLTAGE
10
500Ω
Vcc
2.0
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UA31136
LINEAR INTEGRATED CIRCUIT
PIN DESCRIPTION (Cont.)
PIN No. PIN NAME
FUNCTION
INTERNAL EQUIVALENT CIRCUIT
VOLTAGE
Vcc
11
IF OUT
100Ω
Output terminal of IF AMP.
1.14
11
200μA
Vcc
12
13
RSSI
N-DET
This terminal outputs DC
level according to input
signal level to IF AMP.
Dynamic range is around
70dB.
12
56kΩ
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.
13
Vcc
14
15
N-REC
GND
After output of INVERTER
AMP amplified around 20dB,
noise signal is rectified by
external capacitor.
NOISE
COMP
14
75kΩ
GND terminal.
0.0
Vcc
Vcc
16
MIX IN
5kΩ
1st IF signal input terminal.
10
Input impedance is around
4kΩ at 21.7MHz.
100μA
0.94
30pF
2kΩ
5kΩ
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UA31136
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
NOISE DET RSSI OUT
Vcc
MIX IN
Vcc
+
-
CD
DE EMP
16
MIX IN
15
GND
14
N-REC
13
N-DET
12
RSSI
11
IF OUT
10
QUAD
AF OUT
9
BPF
300Hz ~ 3kHz
AF OUT
LPF
MIX
RSSI
QUADRATURE
DETECTOR
NOISE
COMP
RECTIFIER
NOISE AMP
BUFFER
IF AMP
LOCAL OSC
X'tal
OSC IN
2
OSC OUT
3
MIX OUT
4
VCC
5
IF IN
6
DEC
7
INVERTER
AMP
8
FIL IN
FIL OUT
CF1
+
-
1
Vcc
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UA31136
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (Ta = 25℃)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC
7
V
Power Dissipation
PD
560
mW
Junction Temperature
TJ
125
℃
Operating Temperature
TOPR
-30 ~ +85
℃
Storage Temperature
TSTG
-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
(VCC = 2.0V, fIN (MIX) = 21.7MHz, fIN (IF) = 450kHz, ∆f = ±1.5kHz, fMOD= 1kHz, Ta= 25°C, unless otherwise specified.)
TEST
TEST CONDITIONS
MIN TYP MAX UNIT
PARAMETER
SYMBOL
CIRCUIT
Power Supply Voltage
VCC
1.8
2.0
5.5
V
Noise Detection Output Voltage
VNDET
2
ISINK = 0.2mA
0.1
0.5
V
High
VTH
0.5
0.7
V
2
Noise Detection Level
0.3
0.4
Low
VTL
VRSSI 1
2
VIN(IF) = 30dBµV
200
360
520
mV
RSSI Output Voltage
VCC = 3V
VRSSI 2
VIN(IF) = 100dBµV
2
1.4
2.0
2.6
V
Demodulation Output Level
VOD
2
VIN (IF) = 80dBµV
80
100
120
mV
Current Consumption
IQ
1
3.2
4.6
mA
Noise Detection Output Leak
IO(LEAK)
VNREC = 0.6V, VNDET = 2V
0
5
µA
Current
IF AMP. Input Resistance
RIN(IF)
1.2
1.8
2.4
kΩ
Mixer Output Resistance
RO(MIX)
1.2
1.8
2.4
kΩ
RIN (MIX)
5.5
kΩ
Mixer Input Impedance
CIN (MIX)
2.8
pF
SN Ratio
SN
2
VIN (IF) = 80dBµV
43
65
dB
Rejection Ratio
RR
2
VIN (IF) = 80dBµV, AM = 30%
40
dB
Measured via ceramic filter.
15
18
21
dB
Mixer Conversion Gain
GVC
2
VIN (MIX) = 46dBµV
Mixer Intercept Point
PIM
Input 50Ω
96
dBµV
12dB Sensitivity
12dB SN
11
dBµV
Note: All AC levels are indicated by open lever (EMF).
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LINEAR INTEGRATED CIRCUIT
FUNCTION DISCRIPTION
1. Local oscillator external injection method
Figure 1 and Figure 2 show external injection from pin 2 or pin 1 is possible. In both case, the level at PIN 2 is
between 95dBµV and 100dBµV. When Local oscillator injected from PIN 1, then the input frequency is increased,
the level on pin 2 may not be sufficient, causing a decrease in sensitivity. In such a case, add resistor R51. A built-in
BUFFER amp. minimizes leakage from the mixer.
Vcc
Vcc
1
1
1kΩ
fLO
2
fLO
MIX
2
BUFFER
R51
Figure 1
Figure 2
2. Overtone oscillation
The basic configuration of the local oscillation circuit using overtone oscillation is showed as Fig 3. The C51 and L1
tuning circuits prevent crystal fundamental oscillation. Therefore, set C51 and L1 to inductive at the fundamental
frequency and capacitive at the overtone frequency.
Since the level at pin 2 may decrease and the sensitivity may fall at high frequency as with external injection,
adjust the oscillation level using R51.
1
C2
X'tal
2
C3
C51
L1
R51
Figure 3
3. Detection circuit
Detection stage is quadrature method. Both ceramic and coil discriminator are suitable. The case of using coil is
shown in Figure 4, in this case, L1 and C101 composing a phase shifter, demodulation output VOD is about 80mVrms.
VOD will be increased as raising damping resistance R6. Center frequency f0 and demodulation output depends
largely on phase shifter and C7. For C7 and C101 use a capacitor with good temperature characteristics.
Detector is ceramic discriminator on reference application.
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LINEAR INTEGRATED CIRCUIT
FUNCTION DISCRIPTION(Cont.)
4. INVERTER AMP usage
Figure 5 shows the INVERTER AMP can be used to from a band pass filter.
Set constants as in equations (1) ~ (3). However, because a low pass filter and a high pass filter are built in, it is
recommended that center frequency f0 be about 30kHz.
LPF (fc
HPF (fc
47kHz)
(2) GV = R3 / 2R4
8
9
25kHz)
7
R3
at R4
Rp
Example R3 = 150kΩ, R4 = 330kΩ,
R5 = 3.3kΩ, Rp = 20kΩ (VR)
C = 220pF provide;
f0 ≈ 31kHz, GV ≈ -13dB
Q ≈12
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C
Rp
C
R4
R5
Figure 5
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UA31136
TEST CIRCUIT
VNDET
VTH - H
V
VTH - L
V
VCC
VRSSI - 1
VRSSI - 2
16
51Ω
14
15
GND
MIX IN
N-REC
+
CD
VOD
SN AMR
DE EMP
V
+ BPF
1.5kΩ
300Hz ~ 3kHz
91pF
0.1μF
13
12
11
10
9
N-DET
RSSI
IF OUT
QUAD
AF OUT
UTC UA31136
OSC IN
1
OSC OUT MIX OUT
2
3
21.25MHz
+
56pF
10μF
IF IN
5
VCC
4
39pF
-
fIN (MIX)
21.7MHz
VCC
10μF
1000pF
0.2mA
1000pF
V
-
LINEAR INTEGRATED CIRCUIT
VCC
0.1μF
DEC
6
0.1μF
FIL OUT
FIL IN
7
8
150kΩ
220pF
220pF
10kΩ
5.6kΩ
SW1
CFU450G
V
SW1 : GVC Measurement
Others
b
a
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a
GVC
0.1μF
VN
31kHz
b
51Ω
fIN (IF)
450kHz
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UA31136
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
NOISE DET RSSI OUT
L1
2.2μH
CD : CDB450C24 (MURATA)
Vcc
C9
0.1μF
C13
22pF
R7
100kΩ
C1
1000pF
16
MIX IN
15
GND
C12 +
10μF
C8
1000pF
14
N-REC
13
N-DET
12
-
MIX IN
RSSI
11
Vcc
DE EMP
C7 CD
R6
1.5kΩ
91pF
IF OUT
10
QUAD
BPF
300Hz ~ 3kHz
AF OUT
AF OUT
9
LPF
MIX
RSSI
QUADRATURE
DETECTOR
NOISE
COMP
RECTIFIER
NOISE AMP
4700pF
BUFFER
IF AMP
LOCAL OSC
1
X'tal
21.25MHz
OSC IN
C2
39pF
2
OSC OUT
3
C3 CF1
56pF
MIX OUT
4
VCC
C11 + C10
10μF 0.1μF
5
IF IN
C4
0.1μF
Vcc
6
DEC
C5
220pF
INVERTER
AMP
7
8
FIL IN
FIL OUT
R3
150kΩ
R5
3.3kΩ
C6
220pF
R4
330kΩ
VR1
10kΩ
-
CF1 : CFW450G (MURATA)
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12dB Sensitivity (dBμV EMF)
Demodllation Output Level, VOP (dB)
Mixer Conversion, GVC (dB)
Mixer Conversion, GVC (dB)
Current Consumption, IQ (mA)
Rssi Output Voltage, VRSSI (V)
Rssi Output Voltage, VRSSI (V)
UA31136
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERICS
IN COIL DISCRIMINATER USED
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UA31136
LINEAR INTEGRATED CIRCUIT
IN COIL DISCRIMINATER USED (Cont.)
Noise Detection Frequency Characteristics
3.0
N - REC
1.2
N - DET
0.8
2.0
1.0
0.4
0
0
0
0.1
0.2
0.3
0.4
0.5
Filter Amp Input Level, VIN (mV)
Noise Detector Sensitivity (mV)
1000
500
VCC = 2V
1.6
fIN = 31kHz
N - Det Output Voltage (V)
N - Rec Output Voltage (V)
Noise Detection Characteristics
7
8
150kΩ
220pF
220pF
100
50
5.6kΩ
10kΩ
VIN
VIN level is measured
when N-DET (pin
13)output changes.
10
5
1
0.5
0.1
1
5
10
50
100
Input Frequency, fIN (kHz)
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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