E2U0021-28-81
¡ Semiconductor
MSM7704-01/02/03
¡ Semiconductor
2ch Single Rail CODEC
This version: Aug. 1998
MSM7704-01/02/03
Previous version: Nov. 1996
GENERAL DESCRIPTION
The MSM7704-01/7704-02/7704-03 are two-channel CODEC CMOS ICs for voice signals ranging
from 300 to 3400 Hz. These devices contain filters for A/D and D/A conversion.
Designed especially for a single-power supply and low-power applications, these devices
contain two-channel AD/DA converters in a single chip and achieve a reduced footprint and a
reduced number of external components.
The MSM7704-01/7704-02/7704-03 are best suited for an analog interface to an echo canceller
DSP used in digital telephone terminals, digital PABXs, and hands free terminals.
FEATURES
• Single power supply: +2.7 V to +3.8 V
• Power consumption
Operating mode:
30 mW Typ.
50 mW Max.
Power-saving mode:
3 mW Typ.
6 mW Max.
Power-down mode:
0.03 mW Typ.
0.3 mW Max.
• ITU-T Companding law
MSM7704-01:
m/A-law
pin-selectable
MSM7704-02:
m-law
MSM7704-03: A-law
• Built-in PLL eliminates a master clock
• The PCM interface can be switched between 2 channel serial/parallel
• Transmission clock: 64/128/256/512/1024/2048 kHz
96/192/384/768/1536/1544/200 kHz
(During 2 channel serial mode, the 64 and 96 kHz clocks are disabled)
• Adjustable transmit gain
• Built-in reference voltage supply
• Analog output can directly drive a 1.2 kW load
• Package:
24-pin plastic SOP (SOP24-P-430-1.27-K) (Product name : MSM7704-01GS-K)
(Product name : MSM7704-02GS-K)
(Product name : MSM7704-03GS-K)
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