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T7503 Datasheet(PDF) 1 Page - Agere Systems |
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T7503 Datasheet(HTML) 1 Page - Agere Systems |
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1 / 16 page  Data Sheet February 1998 T7503 Dual PCM Codec with Filters Features s +5 V only s Automatic powerdown mode s Low-power, latch-up-free CMOS technology s On-chip sample and hold, autozero, and precision voltage reference s Differential architecture for high noise immunity and power supply rejection s Automatic master clock frequency selection s 2.048 MHz or 4.096 MHz fixed data rate s Frame sync controlled channel swapping s Differential analog I/O s 300 Ω output drivers s Operating temperature range: –40 °C to +85 °C s µ-law companding Applications s Speakerphone s Telephone answering device (TAD) s POTS for ISDN Description The T7503 device is a single-chip, two-channel µ-law PCM codec with filters. This integrated circuit provides analog-to-digital and digital-to-analog conversion. It provides the transmit and receive filtering necessary to interface a voice telephone circuit to a time-division multiplexed (TDM) system. The device features a differential transmit amplifier, and the power receive amplifier is capable of driving 600 Ω differentially. PCM timing is defined by a single frame sync pulse. This device operates in a delayed timing mode (digital data is valid one clock cycle after frame sync goes high). The T7503 is packaged in a 20-pin SOJ. Figure 1. Block Diagram 5-3609.b GSX0 VFXIN0 VFROP0 GSX1 VFXIN1 VFXIP1 – + FILTER NETWORK ENCODER CHANNEL 0 +2.4 V DECODER PCM INTERFACE POWERDOWN CONTROL INTERNAL TIMING & CONTROL BIAS CIRCUITRY & REFERENCE CHANNEL 1 FILTER NETWORK DX DR GNDD MCLK VDD (1) VFXIP0 VCM0 VFRON0 VCM1 VFROP1 VFRON1 FS GNDA (2) |
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