The PCM78P is a low-cost high-performance 16-bit audio A/D converter with fast conversion time, very low THD+N, and versatile interfacing. It is suitable for DSP data acquisition, test instrumentation, digital audio tape, etc.
The PCM78P is a 16‑bit audio A/D converter designed for low‑cost, high‑performance applications such as DSP, digital audio tape recorders, and telecommunications. It features a fast 4 µs typical conversion time, very low THD+N (typical –88 dB at full scale), and a supply range of +5 V to +15 V. The device is packaged in a 28‑pin plastic DIP and provides two selectable serial output formats (BOB or BTC).
The datasheet includes detailed electrical specifications, pin assignments, typical performance curves, and a theory of operation section. Power‑supply sensitivity, gain and offset errors, and linearity specifications are provided, along with temperature‑dependent performance data.
| Resolution | 16 Bits |
|---|---|
| Analog Input Range | -3 V to +3 V |
| Analog Input Impedance | 1.5 kΩ |
| Logic Family | TTL Compatible CMOS |
| Serial Data Format | BOB or BTC |
| Typical Conversion Time | 4 µs |
| Gain Error | +2 % |
| Power Supply Range | +5 V to +15 V |
| THD+N (typical) | -88 dB at full scale |
The PCM78P converts an analog sample in about 4 µs typical.
It supports two serial output formats: BOB (binary) or BTC (two's complement).
The analog input can accept voltages from –3 V to +3 V.
The device operates from a +5 V to +15 V supply.