GENERAL DESCRIPTION

The MSM7543 and MSM7544 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, ISDN terminals, and digital PBXs. The MSM7543 and MSM7544 use newly-designed operational amplifiers to keep 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 and can drive a 600 W load, can directly drive a handset receiver

FEATURES

• Single power supply: +5 V ±5%

• Low power consumption

   Operating mode: 20 mW Typ. 31.5 mW Max. VDD = 5 V

   Power save mode: 4.5 mW Typ. 8 mW Max. VDD = 5 V

   Power down mode: 1.5 mW Typ. 3 mW Max. VDD = 5 V

• ITU-T Companding law

   MSM7543: m-law

   MSM7544: A-law

• The transmission characteristics of the devices comply with ITU-T G.714

• Built-in PLL eliminates a master clock

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

                       96/192/384/768/1536/1544 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 600 W line transformer

• Package options:

   20-pin plastic skinny DIP (DIP20-P-300-2.54-S1) (Product name : MSM7543RS)

                                                                  (Product name : MSM7544RS)

   24-pin plastic SOP (SOP24-P-430-1.27-K) (Product name : MSM7543GS-K)

                                                         (Product name : MSM7544GS-K)

   26-pin plastic TSOP (TSOPII26/20-P-300-1.27-K) (Product name : MSM7543TS-K)

                                                                  (Product name : MSM7544TS-K)