TCM37C15A

` Meet CCITT/(D3/D4) Channel Bank Recommendations for Input Signals Greater than 55 dBm0
` Programmable Transmit and Receive Gain Control With Pin-Selectable Gain/Attenuation Levels
` Includes Differential Output on the TCM37C14A
` Precision Switched-Capacitor Filters and Converters
` Improved Version TCM29C13A Series COMBOs (CODEC and Filters)
` Low Power CMOS
   Operating Mode . . . 70 mW Typical
   Power-Down Mode . . . 7 mW Typical
` Internal Sample-and-Hold and Autozero Functions
` Precision Internal Voltage References
` TCM37C14A Features Pin-Selectable m-Law or A-Law Companding and Pin-Selectable Master Clock Rate (1.536 MHz, 1.544 MHz, and 2.048 MHz Available)
` TCM37C15A is 2.048 MHz A-Law Only

Supply voltage, V_CC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Supply voltage, V_BB (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Voltage range at any analog input, V_I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V_CC + 0.3 V to V_BB 0.3 V
Continuous total power dissipation at (or below) 25 free-air temperature . . . . . . . . . . . . . . . . . . .  . 1300 mW
Operating free-air temperature range, T_A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 to 85
Storage temperature range, T_stg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  65 to 150
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: DW or N package . . . . . . . . . . . . . . . . . . 260
JEDEC Latch up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  ±250 mA or ±10 V

† Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device.

These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: Voltage values are with respect to GND.

The TCM37C14A and TCM37C15A PCM combo with programmable gain control devices are single-chip PCM combos (pulse-code-modulated CODECs with voice-band filtering). They are designed to perform transmit encoding (A/D conversion) and receive decoding (D/A conversion), as well as the transmit and receive filtering unctions required to meet CCITT/(D3/D4) G.711 and G.714 specifications in a PCM system. Each device provides all the functions required to interface a full-duplex, 4-line voice telephone circuit with a TDM (time-division-multiplexed) system, and also erform the encoding and decoding of call progress tones. The TCM37C14A and TCM37C15A are based on the proven TI TCM29C13A core, and have the added feature of programmable transmit and receive gain.

Primary applications include line interface for digital transmission and switching of T1/E1 carrier (PABX [private branch automatic exchange] and central office telephone systems), subscriber line concentrators, digital encryption systems, and digital signal processing. They are intended to be used at the analog termination of a PCM line or trunk to the POTS (plain old telephone system) local-loop line.

The TCM37C15A is available in 20-pin DW SOIC (small-outline IC) or 20-pin N PDIP (plastic dual-in-line package) packages, and the TCM37C14A is available in a 24-pin DW SOIC package and includes differential output. All are characterized for operation from 40 to 85.