TP3054A, TP3057A, TP13054A, TP13057A MONOLITHIC SERIAL INTERFACE COMBINED PCM CODEC AND FILTER

SCTS026C - SEPTEMBER 1992 - REVISED JULY 1996

features

• Complete PCM Codec and Filtering Systems Include:
  • Transmit High-Pass and Low-Pass Filtering
  • Receive Low-Pass Filter With (sin x)/x Correction
  • Active RC Noise Filters
  • u-Law or A-Law Compatible Coder and Decoder
  • Internal Precision Voltage Reference
  • Serial I/O Interface
  • Internal Autozero Circuitry
• u-Law . . . TP3054A and TP13054A
• A-Law . . . TP3057A and TP13057A
• ±5-V Operation
• Low Operating Power . . . 50 mW Typ
• Power-Down Standby Mode . . . 3 mW Typ
• Automatic Power Down
• TTL- or CMOS-Compatible Digital Interface
• Maximizes Line Interface Card Circuit Density
• Improved Versions of National Semiconductor TP3054, TP3057, TP3054-X, TP3057-X

description

The TP3054A, TP3057A, TP13054A, and TP13057A are comprised of a single-chip PCM codec (pulse code-modulated encoder and decoder) and PCM line filter. These devices provide all the functions required to interface a full-duplex (2-wire) voice telephone circuit with a TDM (time-division-multiplexed) system. These devices are pin-for-pin compatible with the National Semiconductor TP3054A and TP3057A, respectively. Primary applications include:

• Line interface for digital transmission and switching of T1 carrier, PABX, and central office telephone systems
• Subscriber line concentrators
• Digital-encryption systems
• Digital voice-band data-storage systems
• Digital signal processing

These devices are designed to perform the transmit encoding (A/D conversion) and receive decoding (D/A conversion) as well as the transmit and receive filtering functions in a PCM system. They are intended to be used at the analog termination of a PCM line or trunk. The devices require two transmit and receive master clocks that may be asynchronous (1.536 MHz, 1.544 MHz, or 2.048 MHz), transmit and receive data clocks that are synchronous with the master clock (but can vary from 64 kHz to 2.048 MHz), and transmit and receive frame-sync pulses. The TP3054A, TP3057A, TP13054A, and TP13057A provide the band-pass filtering of the analog signals prior to encoding and after decoding of voice and call progress tones. The TP3057A and TP13057A contain patented circuitry to achieve low transmit channel idle noise and are not recommended for applications in which the composite signals on the transmit side are below -55 dBm0.

The TP3054A and TP3057A are characterized for operation from 0°C to 70°C. The TP13054A and TP13057A are characterized for operation from -40°C to 85°C.

View more information about generic part numbers:TP13054A, TP3054A, TP3057A

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