Product Overview
Texas Instruments TCM320AC36CN 5V Voice Band Audio CODEC DIP-20
Condition
New old stock. Unused surplus accompanied by original Texas Instruments promotional card folder and technical literature inserts. Markings legible: 2471QFT TCM320AC36CN 30748 with Texas Instruments logo.
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Product Overview
Designed for telecommunications and digital audio signal processing, the Texas Instruments TCM320AC36CN provides complete analog-to-digital and digital-to-analog voice-band conversion on a single 5V rail. The integrated circuit combines internal antialiasing and reconstruction filters, microphone bias circuitry, and direct piezoelectric speaker drive in a standard 20-pin dual in-line package. Operation can be set for 8-bit mu-Law companding or 13-bit dynamic range linear conversion at sampling rates up to 24 kHz.
Key Features
- Single 5V supply operation with low power consumption (40 mW typical active, 1.25 mW power-down)
- Combined transmit ADC, receive DAC, and integrated band-pass filtering
- Selectable 8-bit mu-Law companded conversion or 13-bit dynamic range linear conversion
- Variable sampling rates up to 24 kHz with audio pass-band support up to 10 kHz
- Designed for standard 2.048 MHz master clock input
- Electret microphone bias reference voltage output and direct piezoelectric speaker drive capability
- Compatible with standard digital signal processors (DSPs) via serial interface
- Standard 20-pin plastic dual in-line package (PDIP-20, N suffix)
Applications
- Bench technicians repairing legacy cellular, cordless, or private branch exchange (PBX) telephone equipment
- Engineers integrating voice-band audio codecs with DSP development boards for speech processing experiments
- Makers and synthesizer builders constructing lo-fi 8-bit audio effects, robotic voice modulators, or digital speech synthesizers
- Ham radio operators building digital voice or packet radio interfaces requiring companded audio conversion
Frequently Asked Questions
What package format is this IC?
This unit is in a standard 20-pin plastic dual in-line package (PDIP-20), designated by Texas Instruments with the N suffix. It fits standard 0.300-inch wide DIP sockets and breadboards.
What master clock frequency does the TCM320AC36 require?
The device is designed for a standard 2.048 MHz master clock, with internal timing generating variable sampling rates up to 24 kHz.
How does the TCM320AC36 differ from the TCM320AC37?
The TCM320AC36 provides 8-bit mu-Law companding alongside its 13-bit linear mode, which matches North American and Japanese telecommunications standards. The TCM320AC37 provides A-Law companding for European and international telephony networks.
Before smartphones turned audio processing into software background tasks, chips like this handled voice conversion one clean clock pulse at a time. Plug it in, feed it five volts, and let the hardware do the talking.
