TP3057J中文资料\Enhanced\ Serial Interface CODEC/Filter COMBO® Family数据手册TI规格书

描述 Description

General Description
The TP3054, TP3057 family consists of m-law and A-law monolithic PCM CODEC/filters utilizing the A/D and D/A conversion architecture shown in Figure 1, and a serial PCM interface. The devices are fabricated using National’s advanced double-poly CMOS process (microCMOS).
The encode portion of each device consists of an input gain adjust amplifier, an active RC pre-filter which eliminates very high frequency noise prior to entering a switched-capacitor band-pass filter that rejects signals below 200 Hz and above 3400 Hz. Also included are auto-zero circuitry and a companding coder which samples the filtered signal and encodes it in the companded m-law or A-law PCM format. The decode portion of each device consists of an expanding decoder, which reconstructs the analog signal from the companded m-law or A-law code, a low-pass filter which corrects for the sin x/x response of the decoder output and rejects signals above 3400 Hz followed by a single-ended power amplifier capable of driving low impedance loads. The devices require two 1.536 MHz, 1.544 MHz or 2.048 MHz transmit and receive master clocks, which may be asynchronous; transmit and receive bit clocks, which may vary from 64 kHz to 2.048 MHz; and transmit and receive frame sync pulses. The timing of the frame sync pulses and PCM data is compatible with both industry standard formats.

特性 Features

■ Complete CODEC and filtering system (COMBO) including:
   — Transmit high-pass and low-pass filtering
   — Receive low-pass filter with sin x/x correction
   — Active RC noise filters
   — m-law or A-law compatible COder and DECoder
   — Internal precision voltage reference
   — Serial I/O interface
   — Internal auto-zero circuitry
■ m-law, 16-pin—TP3054
■ A-law, 16-pin—TP3057
■ Designed for D3/D4 and CCITT applications
■ g5V operation
■ Low operating power—typically 50 mW
■ Power-down standby mode—typically 3 mW
■ Automatic power-down
■ TTL or CMOS compatible digital interfaces
■ Maximizes line interface card circuit density
■ Dual-In-Line or surface mount packages
■ See also AN-370, ‘‘Techniques for Designing with CODEC/Filter COMBO Circuits’’

应用 Application

■ g5V operation
■ Low operating power—typically 50 mW
■ Power-down standby mode—typically 3 mW
■ Automatic power-down
■ TTL or CMOS compatible digital interfaces
■ Maximizes line interface card circuit density
■ Dual-In-Line or surface mount packages
■ See also AN-370, ‘‘Techniques for Designing with CODEC/Filter COMBO Circuits’’