View MM1077_1038679.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

MITSUMI
Compander IC MM1077
Compander IC
Monolithic IC MM1077
Outline
This IC was developed for use in cordless telephone equipment. 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 2.0V) 2. Internal mute function 3. Internal limiter (IDC) function 4. Compressor input can be switched between MIC and LINE 5. Internal standby function 6. Data input, output pins 7. Independent mute circuit
Package
SSOP-24A (MM1077XF)
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.IN1 C.IN2 C.INC.RECT C.RIN C.FB C.NF 9 10 11 12 13 14 15 16 DATA. IN C.CONT N.C GND STANDBY SW C.IN SW C.MUTE SW E.MUTE SW 17 18 19 20 21 22 23 24 E.RECT E.OUT E.RIN A.OUT A.INA.IN+ E.Vref Vcc
MITSUMI
Compander IC MM1077
Block Diagram
Absolute Maximum Ratings
Item Storage temperature Operating temperature Power supply voltage Allowable loss Operating voltage
(Ta=25C) Symbol TSTG TOPR VCC max. Pd Ratings -40~+125 -10~+70 -0.3~+8 650 +2.0~+7 Units
C C
V mW V
MITSUMI
Compander IC MM1077
Electrical Characteristics
Item
(Except where noted otherwise, Ta=25C, VCC=3V, fin=1kHz) Symbol Measurement conditions ICC Iscc Vth VINc Gc1 Gc2 THDc Vnc Attc Vlimc GDATA CTc RRc VINe Ge1 Ge2 Ge3 THDe Ve max. Vne Atte GI Veo max. CTe RRe Voc=100mVrms, VIN=0dB VIN=-20dB VIN=-40dB VIN=0dB No signal (CCITT) VIN=0dB, C.MUTE SW : ON THD=10% 40 700 0.40 8.0 -0.5 -1.0 No signal Min. Typ. Max. Units 4.0 0 0.65 13.5 0 0 0.3 2.5 50 800 0 900 33 23 35 0 0 0 0.15 600 60 14.6 0.90 60 50 800 20 70 15.6 1.10 75 60 16.6 40 50 0.5 1.0 1.5 1.0 900 0.5 6.0 10 0.80 0.5 1.0 1.0 5.0 mA A V dB dB % mVrms dB mVp-p dB mVrms dB dB mVrms dB dB dB % mVrms Vrms dB dB Vrms dB dB
Consumption current Standby current consumption Threshold voltage Input reference level Gain error
18.0 mVrms
*
Distortion Compressor unit Output noise voltage Mute attenuation Limit voltage DATA pin voltage gain DATA pin maximum output Crosstalk Ripple rejection ratio Input reference level
C. MUTE SW : ON, VIN=0dB -0.5 EXPVIN=0dB VR=100mVrms, fR=1kHz Voe=100mVrms, VIN=0dB VIN=-10dB VIN=-20dB VIN=-30dB VIN=0dB THD=10% No signal (CCITT) VIN=0dB, C. MUTE SW : ON VIN=0dB THD=10% COMPVIN=0dB VR=100mVrms, fR=1kHz G (dB) 28 18 25 -0.5 -1.0 -1.5
VD max. C.MUTE SW : ON, THD=10% 800
Gain error difference
*
Distortion Expander unit Maximum output voltage Output noise voltage Mute attenuation Input amp voltage gain Input amp maximum output Crosstalk Ripple rejection ratio
(VOUT (dBv)+20dB) -VIN *Gain error difference = G : COMP=0.5, EXP=2 (dB)
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 MM1077
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. When pin 4 is open the gain is lowest, and an input voltage of approx. 13.5Vrms 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 (100k).
MITSUMI
Compander IC MM1077
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.
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 MM1077
Measuring Circuit
(Except where noted otherwise, fIN=1kHz)
1. Consumption current
5. Distortion
2. Threshold voltage
6. Limit voltage
3. Input reference level
7. Maximum output voltage
4. Gain error difference
8. DATA pin/Input amp voltage gain
Gain error difference= (VOUT (dBv) -20dB) -VIN (dB) (G=COMP=0.5, EXP=2)
G
Gain error difference (1) Gc1=-20dB, Ge1=-10dB Gain error difference (2) Gc2=-40dB, Ge2=-20dB Gain error difference (3) Ge3=-30dB
MITSUMI
Compander IC MM1077
9. DATA pin/Input amp maximum output
12. Output noise voltage
10. Crosstalk
13. Mute attenuation
11. Ripple rejection

▲Up To Search▲

Price & Availability of MM1077

	To Download MM1077 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .