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PDF MM1077 Data sheet ( Hoja de datos )
| Número de pieza | MM1077 | |
| Descripción | Compander IC | |
| Fabricantes | Mitsumi Electronics | |
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MITSUMI
Compander IC
Monolithic IC MM1077
Compander 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
C.Vref
9
DATA. IN
17
E.RECT
2
C.IN1
10 C.CONT 18
E.OUT
3
C.IN2
11
N.C
19 E.RIN
4
C.IN-
12
GND
20 A.OUT
5
C.RECT
13 STANDBY SW 21
A.IN-
6
C.RIN
14 C.IN SW 22
A.IN+
7
C.FB
15 C.MUTE SW 23
E.Vref
8
C.NF
16 E.MUTE SW 24
Vcc
1 page  
MITSUMI
Compander IC MM1077
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.
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.
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet MM1077.PDF ] | |
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