24-bit stereo ADC at 192 kHz — the audio capture chain
The PCM1860DBTR is a 24-bit stereo audio ADC from Texas Instruments, sampling up to 192 kHz per channel. The 24-bit resolution gives 144 dB dynamic range theoretical, enough for high-fidelity line-level inputs without audible quantization noise. The 192 kHz sampling rate captures the full audible band plus ultrasonic content for processing like room correction or high-resolution audio. Data exits via an I²S serial interface, the standard bus for connecting to a DSP, FPGA, or audio codec. The I²S format carries left and right channels on the same wire pair, so a single PCM1860DBTR feeds a stereo input to a processor without extra muxing.
Supply rails and temperature grade
Operates from a single 3V to 3.6V supply, with separate analog and digital supply pins (AVDD and DVDD). The split domains let the analog section run from a clean LDO while the digital side shares the processor rail, reducing conducted noise coupling into the ADC core. This suits the ADC for engine-bay audio processing, outdoor telecom equipment, or factory-floor sound monitoring where the enclosure sees high thermal cycling.
30-TSSOP package — board layout notes
Housed in a 30-pin TSSOP (4.4 mm body width, 0.65 mm pitch). The narrow pitch demands a 4-layer board for fan-out if all 30 pins are used; a 2-layer board can route the outer rows but the inner analog/digital supply pins benefit from a ground plane underneath. The exposed pad on the bottom of the package should be soldered to a thermal land on the PCB to improve heat dissipation and provide a low-impedance ground return for the analog section. Available in tape-and-reel packaging (TR) or cut tape (CT) — the TR option is the standard for volume pick-and-place; CT suits prototype builds where only a handful of parts are needed.