EXTENDED TEMPERATURE SERIAL INTERFACE CODECFILTER COMBO FAMILY

The TP3054, TP3057 family consists of µ-law and A-law monolithic PCM CODEC/filters utilizing the A/D and D/A conversion architecture shown in , and a serial PCM interface. The devices are fabricated using TI"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 µ-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 µ-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. 

-40°C to +85°C Operation

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
• µ-Law or A-Law Compatible COder and DECoder
• Internal Precision Voltage Reference
• Serial I/O Interface
• Internal Auto-Zero Circuitry

µ-Law, 16-Pin - TP3054

A-Law, 16-Pin - TP3057

Designed for D3/D4 and CCITT Spplications

±5V 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 PCC Surface Mount Packages

See also AN-370, “Techniques for Designing with CODEC/Filter COMBO Circuits” (SNLA136)