TCM38C17IDL

Codecs Overview

The TCM38C17IDL is a four-channel single-chip PCM combo device integrating CODEC and voice-band filtering functions. It operates on a single 5-V supply and supports 2.048 MHz master clock operation. The device performs transmit encoding (A/D conversion) and receive decoding (D/A conversion) while meeting CCITT G.711 and G.714 specifications. Each channel interfaces full-duplex, 4-line voice telephone circuits with TDM systems via a single PCM I/O interface. It features pin-selectable m-law or A-law companding, advanced switched-capacitor filters, and sigma-delta converter technology. The component is housed in a 48-pin plastic DL SSOP package and is characterized for operation from -40 °C to 85°C.

Codecs Feature Summary

• Integrates four independent channels of PCM codec functionality within a single chip to replace multiple discrete devices.
• Utilizes advanced switched-capacitor filters and sigma-delta A/D and D/A converter technology for signal processing.
• Supports pin-selectable m-law or A-law companding standards for flexible digital transmission compatibility.
• Features differential signal processing architecture with low crosstalk and good power supply rejection characteristics.

Codecs Applications

• E1 carrier digital transmission systems
• PABX (Private Automatic Branch Exchange) equipment
• Central office telephone systems
• Subscriber line concentrators

Codecs Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature range. Ensure that the procurement source provides valid traceability for this legacy component. Confirm compliance with RoHS directives if required by the application environment. Check for availability constraints as this is an older generation product. Validate that the supplier offers appropriate handling procedures for CMOS devices to prevent electrostatic discharge damage during transit.

Codecs Selection Notes

Select this component when designing fixed-data-rate PCM systems requiring quad-channel integration. Ensure the design accommodates the 2.048 MHz master clock requirement and frame synchronization timing. Verify that the analog input and output levels match the system's voice-band requirements. Consider the power-down capability for each channel if variable power consumption is a design constraint. Confirm that the 600-ohm differential load impedance aligns with the transmission line specifications.

Codecs Part Context

This device belongs to Texas Instruments' QCombo family of PCM combos. It is specifically designed to replace four individual TCM29C13-type devices, reducing board space and simplifying the interface to TDM systems. The technology leverages submicron silicon-gate CMOS processes to maintain dynamic range and idle-channel noise performance in a compact form factor suitable for telecommunications infrastructure.

Codecs Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided datasheet. Designers should verify compatibility with existing TCM29C13 implementations regarding pinout and timing parameters before substitution.