GENERAL DESCRIPTION

The MSM7541 and MSM7542 are single-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 are optimized for telephone terminals in digital wireless systems.

The MSM7541 and MSM7542 use newly designed operational amplifiers to maintain small current deviations caused by power voltage fluctuations.

The devices use the same transmission clocks as those used in the MSM7508B and MSM7509B. The analog output signal, which is of a differential type, directly drives a piezoelectric type handset receiver.

FEATURES

• Single power supply: +3.0 V to +3.8 V

• Low power consumption

Operating mode: 23 mW Typ. VDD = 3.3 V

Power save mode: 1 mW Typ. VDD = 3.3 V

Power down mode: 0.04 mW Typ. VDD = 3.3 V

• ITU-T Companding law

MSM7541: m-law

MSM7542: A-law

• Built-in PLL eliminates a master clock

• Serial data rate: 64/128/256/512/1024/2048 kHz

96/192/384/768/1536/1544/200 kHz

• Adjustable transmit gain

• Adjustable receive gain

• Built-in reference voltage supply

• Built-in analog loop back test mode

• Differential type analog output. Directly drives a piezoelectric type receiver equivalent to 1.2 kW + 55 nF

• Package options:

20-pin plastic skinny DIP (DIP20-P-300-2.54-S1) (Product name : MSM7541RS)

(Product name : MSM7542RS)

24-pin plastic SOP (SOP24-P-430-1.27-K) (Product name : MSM7541GS-K)

(Product name : MSM7542GS-K)

26-pin plastic TSOP (TSOPII26/20-P-300-1.27-K) (Product name : MSM7541TS-K)

(Product name : MSM7542TS-K)