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MITSUMI
Compander IC MM1102
Compander IC
Monolithic IC MM1102
Features
This IC was developed for use in cordless telephones. It is a compander IC incorporating
compressor/expander circuits for a significant noise reduction effect without complicated external circuitry.
On the transmission side, the dynamic range of audio signals is compressed by the compressor circuit; on the
receiving side, the expander expands the signals. As a result the dynamic range over the transmission
channel is reduced logarithmically by one-half.
1. Can be driven at low voltages (down to 2.4V)
2. Internal mute function
3. Internal limiter (IDC) function
4. Two internal op-amps (for splatter filter)
5. Internal standby function
6. Data input, output pins
7. Independent mute circuit
Package
SSOP-24A (MM1102XF)
Pin Assignment
SSOP-24A
136924587101211
24 20 1723 21 19 18 1622 131415
Applications
1. Cordless telephones
2. Various mobile communication devices
1 C.Vref 9 C.OUT 17 E.MUTE SW
2 C.IN 10 BUFIN 1 18 E.OUT
3 C.IN
-
11 BUFOUT 1 19 E.RECT
4 C.RECT 12 GND 20 A.OUT
5 C.RIN 13 BUFIN 2 21 A.IN
-
6 C.FB 14 BUFOUT 2 22 A.IN+
7 C.NF 15 STANDBY SW 23 E.Vref
8 DATA IN 16 C.MUTE SW 24 V
CC
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MITSUMI
Compander IC MM1102
Block Diagram
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MITSUMI
Compander IC MM1102
Pin Description
Pin no. DC voltage
I/O resistance
Function Equivalent circuit
Regulator output
1PIN···C.Vref
23PIN···E.Vref
Mike amp unit
Mike amp input stage
Rectifier circuit unit
Attack and release times
determined
5 1.5V 15kΩ
Rectifier circuit unit
Input pin
6 1.5V
-
7 1.5V 10kΩ
Compressor amp unit
6PIN···Output pin
7PIN···Feedback resistance
8 1.5V 100kΩ
9 1.5V
-
Inverting amp (0dB)
8PIN···Input pin
9PIN···Output pin
1 1.5V
-
23 1.3V
-
2 1.5V 100kΩ
3 1.5V 2.2kΩ
4
-
10kΩ
19
-
10kΩ
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MITSUMI
Compander IC MM1102
10
--
(13)
11
--
(14)
Buffer amp unit
Pin 10 (13): Input pin not
biased internally
Pin 11 (14): Output pin
12 0V
GND pin
15
Vcc
150kΩ
(3V)
Standby SW
The IC operates at approx.
V
CC-1 V and below. At open
and high (V
CC) levels, it is
in the standby state.
16 0.7V
-
17 0.7V
-
Compressor · expander
Mute SW
Muted at approx. 0.6V and
below; operates normally at
open and high levels
18 1.3V
-
Expander unit
Output pin
20
--
21
--
22
--
Pin 20: Output pin
Input amp
Pin 22: Input pin (+)
Pin 21: Input pin (
-
)
None of these are biased
internally
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MITSUMI
Compander IC MM1102
Absolute Maximum Ratings
(Ta=25°C)
Electrical Characteristics
(Except where noted otherwise, Ta=25°C, VCC=3V, fIN=1kHz)
Item Symbol Ratings Units
Storage temperature T
STG
-
40~+125
°
C
Operating temperature T
OPR
-
10~+70
°
C
Power supply current V
CC max. +2.4~+8 V
Allowable loss Pd 450 mW
Item Symbol Measurement conditions Min. Typ. Max. Units
Consumption current I
CC No signal 4.4 6.5 mA
Standby current consumption Is
CC 010µA
Threshold voltage Vth 0.65 V
Input reference level Vinc V
OC=100mVrms, VIN=0dB 8.0 13.5 18.0
mVrms
Gain error difference
*
Gc1 VIN=-20dB
-
0.5 0 0.5 dB
Gc2 V
IN=
-
40dB
-
1.0 0 1.0 dB
Distortion THD
C VIN=0dB 0.3 1.0 %
Output noise voltage Vnc No signal (CCITT) 2.5 5.0
mVrms
Mute attenuation Attc VIN=0dB, Mute SW : on
-
50-40 dB
Limit voltage Vlimc THD=10% 1.15 1.3 1.45 V
P-P
DATA pin voltage gain GDATA VIN=0dB, Mute SW : on
-
0.5 0 0.5 dB
DATA pin maximum output VD max. THD=10%, Mute SW : on 0.70 Vrms
Crosstalk CT
C EXPVIN=0dB
-
33-28 dB
Ripple rejection ratio RR
C VR=100mVrms, fR=1kHZ
-
23-18 dB
Compressor
unit
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MITSUMI
Compander IC MM1102
Electrical Characteristics
(Except where noted otherwise,Ta=25°C, VCC=3V, fin=1kHz)
Function Description
*
Gain error difference = (VOUT+20dB) -VIN G (dB)
G : COMP=0.5, EXP=2
1. Compressor unit
The compressor unit consists of the mike amp, compressor, limiter circuit, data amp, and mute circuit.
The mike amp gain can be adjusted through an external resistance, and so the mike amp can be
connected directly to a microphone. An internal limiter circuit to prevent overmodulation as well as a data
amp (0dB amp) enabling transmission of data signals without compression are also provided. Switching
between audio signals and data signals is possible using the compressor mute switch.
2. Expander unit
The expander unit consists of an input amp, expander, and mute circuit.
The input amp makes available all input and output signals at pins, and so can be used freely as an
amplifier, filter amp, or data amp. When used as a data amp, the expander mute switch can be set so that
the expander output is nearly silent.
Item Symbol Measurement conditions Min. Typ. Max. Units
Input reference level Vine Voe=100mVrms, V
IN=0dB 25 35 50
mVrms
Ge1 VIN=-10dB
-
0.5 0 0.5 dB
Gain error difference
*
Ge2 VIN=-20dB
-
1.0 0 1.0 dB
Ge3 V
IN=
-
25dB
-
1.5 0 1.5 dB
Distortion THDe V
IN=0dB 0.15 1.0 %
Maximum output voltage Ve max. THD=10% 550 700
mVrms
Output noise voltage Vne No signal (CCITT) 20 40
µVrms
Mute attenuation Atte VIN=0dB, Mute SW : on 60 70 dB
Input amp voltage gain GI V
IN=0dB 14.6 15.6 16.6 dB
Input amp maximum output Veo max. THD=10% 0.90 1.10 Vrms
Crosstalk CTe COMPV
IN=0dB
-
75-60 dB
Ripple rejection ratio RRe V
R=100mVrms, fR=1kHz
-
60-50 dB
Buffer amp gain Gba Voba=100mVrms
-
10+1dB
Buffer maximum output voltage
Voba max.
THD=10% 0.35 0.50 Vrms
COMP reference voltage C.Vref 1.5 V
EXP reference voltage E.Vref 1.3 V
Expander
unit
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MITSUMI
Compander IC MM1102
About Application Circuits
1. Mike amp
The compressor unit mike amp is exposed to circuits outside the IC via positive and negative input pins.
The positive input pin is connected to C.Vref by a bias resistance of 100kΩ, so that no external bias is
needed.
he internal configuration appears in Fig. 1. When pin 4 is open the gain is lowest, and an input voltage of
approx. 13.5mVrms is the reference level. When the external resistance is 0Ω, the gain is maximum. The
internal configuration appears in Fig. 1.
2. Rectifier circuit unit (rectifier)
The product of the external capacitance and the internal resistance (10kΩ) determines the time constants
for the attack and release times.
3. Compressor amp
The compressor amp requires that the DC gain be unity and the AC gain be infinite. In order to satisfy this
requirement, AC feedback is eliminated and only DC feedback is used. In order that only DC feedback be
present, a capacitor to eliminate AC components is connected to pin 8. The cutoff frequency is determined
by the product with the internal resistance (10kΩ).
4. Compressor data amp
The data amp uses an inverting amp. The internal input resistance is 100kΩ, and the DC bias voltage is
1.3V. The compressor mute switch at pin 15 is used to switch between data signals and audio signals.
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MITSUMI
Compander IC MM1102
5. Expander input amp
The positive and negative input pins and the output pin are exposed to circuitry outside the IC. The
expander input amp can be used as a signal amplifier, a buffer amplifier, and a filter amp. By taking the
signal from this amp's output pin, the data signal can be obtained without passing through the expander. If
the expander mute switch is turned on, this signal can be prevented from appearing in the expander output.
6. Mike amp input switch and mute switches
The internal equivalent circuit for each of these switches appears in Fig. 6.
7. Standby switch
The internal equivalent circuit for the standby switch appears in Fig. 7.
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MITSUMI
Compander IC MM1102
Measuring Circuit
(Except where noted otherwise, VIN=1kHz)
1. Consumption current
2. Threshold voltage
3. Input reference level
Gain error difference= (VOUT (dBv) -20dB) -VIN (dB) G
(G=COMP=0.5, EXP=2)
Gain error difference (1) Gc1=
-
20dB, Ge1=-10dB
Gain error difference (2) Gc2=
-
40dB, Ge2=-20dB
Gain error difference (3) Ge2=
-
30dB
4. Gain error difference
5. Distortion
6. Limit voltage
7. Maximum output voltage
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MITSUMI
Compander IC MM1102
10. Crosstalk
11. Ripple rejection
12. Output noise voltage8. DATA pin/Input amp voltage gain
9. DATA pin/Input amp maximum output
13. Mute attenuation
14. Buffer amp gain
15. Reference voltage
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