Single Rail Linear CODEC
Description
E2U0053-28-81
¡ Semiconductor MSM7728
¡ Semiconductor Single Rail Linear CODEC
This version: Aug.
1998 MSM7728 Previous version: Apr.
1997
GENERAL DESCRIPTION
The MSM7728 is a single-channel linear CODEC CMOS IC for voice signals that contains filters for A/D and D/A conversions.
Designed especially for a single-power supply and low-power applications, the device is optimized for applications for the analog interfaces of audio signal processing DSPs and digital wireless systems.
The analog outputs include the speaker drive output, earphone drive output and ringer output.
Therefore, the sound interface can be configured with a few external circuits.
FEATURES
• Single power supply : 2.
5 V to 3.
6 V • Low power consumption Operating mode : 36 mW Typ.
Power down mode : 0.
003 mW Typ.
• Digital signal input/output interface : 14-bit serial code in 2's complement format • Transmission clock frequency : 112 kHz min.
, 2048 kHz max.
• Filter characteristics : Complies with ITU-T Recommendation G.
714 • Built-in PLL eliminates a master clock • Built-in PB tone signal generator • Built-in service tone generator • Built-in ringer tone generator • General latch output: 1 bit • Both transmit and receive gain adjustable by external control • Receive interface: Speaker direct drive output Earphone interface output : 600 W, 1 mW max.
Ringer output : 70 nF, 4 VPP • Transmit gain adjustable using an external resistor • Transmit microphone amplifier is eliminated by the gain setting of a maximum of 36 dB.
• Built-in reference voltage supply • Serial 8-bit processor interface • Package: 30-pin plastic SSOP (SSOP30-P-56-0.
65-K) (Product name: MSM7728GS-K)
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¡ Semiconductor
MSM7728
BLOCK DIAGRAM
MAO MAIN – + SW1 VOL1
CODEC RC LPF 8th BPF 14 BIT ADCONV AUTO ZERO BCLK VOL2 5th LPF 14 BIT DACONV RCONT PCMOUT TCONT SYNC
SGC
SG GEN VR GEN SPK
PCMIN
RTIM
SPKP
– +
PLL SW 2 SW 4 SW CONTROL LA
SPKN
– +
VOL CONTROL EAR EAR TOUT LED RINGP RINGN VOL4 RINGER Tone – + SW 3 SW 5 Tone...
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