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MITSUMI
Compander IC MM1102
Compander IC
Monolithic IC MM1102
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.
Features
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)
Applications
1. Cordless telephones 2. Various mobile communication devices
Pin Assignment
24 23 22 21 20 19 18 17 16 15 14 13
1 2 3 4 5 6 7 8 9 10 11 12 SSOP-24A 1 2 3 4 5 6 7 8 C.Vref C.IN C.INC.RECT C.RIN C.FB C.NF DATA IN 9 10 11 12 13 14 15 16 C.OUT BUFIN 1 BUFOUT 1 GND BUFIN 2 BUFOUT 2 STANDBY SW C.MUTE SW 17 18 19 20 21 22 23 24 E.MUTE SW E.OUT E.RECT A.OUT A.INA.IN+ E.Vref VCC
MITSUMI
Compander IC MM1102
Block Diagram
MITSUMI
Compander IC MM1102
Pin Description
Pin no. 1 23 DC voltage I/O resistance 1.5V 1.3V Function Regulator output 1PIN***C.Vref 23PIN***E.Vref Equivalent circuit
2 3
1.5V 1.5V
100k 2.2k
Mike amp unit Mike amp input stage
4 19
-
10k 10k
Rectifier circuit unit Attack and release times determined
5
1.5V
15k
Rectifier circuit unit Input pin
6 7
1.5V 1.5V
10k
Compressor amp unit 6PIN***Output pin 7PIN***Feedback resistance
8 9
1.5V 1.5V
100k -
Inverting amp (0dB) 8PIN***Input pin 9PIN***Output pin
MITSUMI
Compander IC MM1102
10 (13)
-
-
Buffer amp unit Pin 10 (13): Input pin not biased internally
11 (14)
-
-
Pin 11 (14): Output pin
12
0V
GND pin
15
Vcc (3V)
150k
Standby SW The IC operates at approx. VCC-1 V and below. At open and high (VCC) levels, it is in the standby state.
16 17
0.7V 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
MITSUMI
Compander IC MM1102
Absolute Maximum Ratings
Item Storage temperature Operating temperature Power supply current Allowable loss
(Ta=25C) Symbol TSTG TOPR VCC max. Pd Ratings -40~+125 -10~+70 +2.4~+8 450 Units
C C
V mW
Electrical Characteristics
Item
(Except where noted otherwise, Ta=25C, VCC=3V, fIN=1kHz) Symbol Measurement conditions ICC IsCC Vth Vinc Gc1 VOC=100mVrms, VIN=0dB VIN=-20dB VIN=-40dB VIN=0dB No signal (CCITT) VIN=0dB, Mute SW : on THD=10% VIN=0dB, Mute SW : on THD=10%, Mute SW : on EXPVIN=0dB VR=100mVrms, fR=1kHZ 1.15 -0.5 8.0 -0.5 -1.0 No signal Min. Typ. Max. Units 4.4 0 0.65 13.5 0 0 0.3 2.5 -50 1.3 0 0.70 -33 -23 -28 -18 6.5 10 mA A V 18.0 mVrms 0.5 1.0 1.0 5.0 -40 1.45 0.5 dB dB % mVrms dB VP-P dB Vrms dB dB
Consumption current Standby current consumption Threshold voltage Input reference level
Gain error difference
*
Gc2 THDC Vnc Attc Vlimc GDATA VD max. CTC RRC
Distortion Output noise voltage Compressor unit Mute attenuation Limit voltage DATA pin voltage gain DATA pin maximum output Crosstalk Ripple rejection ratio
MITSUMI
Compander IC MM1102
Electrical Characteristics
Item
(Except where noted otherwise,Ta=25C, VCC=3V, fin=1kHz) Symbol Measurement conditions Vine Ge1 Voe=100mVrms, VIN=0dB VIN=-10dB VIN=-20dB VIN=-25dB VIN=0dB THD=10% No signal (CCITT) VIN=0dB, Mute SW : on VIN=0dB THD=10% COMPVIN=0dB VR=100mVrms, fR=1kHz Voba=100mVrms THD=10% -1 0.35 60 14.6 0.90 550 Min. Typ. Max. Units 25 -0.5 -1.0 -1.5 35 0 0 0 0.15 700 20 70 15.6 1.10 -75 -60 0 0.50 1.5 1.3 -60 -50 +1 16.6 40 50 0.5 1.0 1.5 1.0 mVrms dB dB dB % mVrms Vrms dB dB Vrms dB dB dB Vrms V V
Input reference level
Gain error difference
*
Ge2 Ge3
Distortion Expander unit Maximum output voltage Output noise voltage Mute attenuation Input amp voltage gain Input amp maximum output Crosstalk Ripple rejection ratio Buffer amp gain Buffer maximum output voltage COMP reference voltage EXP reference voltage
THDe Ve max. Vne Atte GI Veo max. CTe RRe Gba Voba max. C.Vref E.Vref
*Gain error difference = (VOUT+20dB) -VIN G (dB) G : COMP=0.5, EXP=2
Function Description
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.
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 100k, 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 0, 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 (10k) 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 (10k). 4. Compressor data amp The data amp uses an inverting amp. The internal input resistance is 100k, 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.
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.
MITSUMI
Compander IC MM1102
Measuring Circuit
(Except where noted otherwise, VIN=1kHz)
1. Consumption current
5. Distortion
2. Threshold voltage
6. Limit voltage
3. Input reference level
7. Maximum output voltage
4. Gain error difference
Gain error difference= (VOUT (dBv) -20dB) -VIN (dB) (G=COMP=0.5, EXP=2) Gain error difference (1) Gain error difference (2) Gain error difference (3)
G
Gc1=-20dB, Ge1=-10dB Gc2=-40dB, Ge2=-20dB Ge2=-30dB
MITSUMI
Compander IC MM1102
8. DATA pin/Input amp voltage gain
12. Output noise voltage
9. DATA pin/Input amp maximum output
13. Mute attenuation
10. Crosstalk
14. Buffer amp gain
11. Ripple rejection
15. Reference voltage

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