The AD7827 is a high speed, single channel, low power, analog-to-digital converter with a maximum throughput of 1 MSPS that operates from a single 3V or 5V supply. The AD7827 contains a track/hold amplifier, an on-chip 2.5V reference (2% tolerance), a 420 ns 8-bit half-flash ADC, and a serial interface. The serial interface is compatible with the serial interfaces of most DSPs (Digital Signal Processors). The throughput rate of the AD7827 is dependent on the c
The AD7827 is an 8‑bit half‑flash analog‑to‑digital converter capable of up to 1 MSPS conversion rate. It operates from a single 3 V or 5 V supply and includes an on‑chip track‑and‑hold, a 2.5 V reference, and a three‑wire serial interface compatible with many DSPs and microcontrollers.
The document provides detailed electrical specifications, pin descriptions, timing diagrams, power‑down operation, and typical application circuits. It also includes ordering information for the DIP and SOIC package variants and explains the conversion process, reference options, and performance characteristics such as SNR and THD.
| Resolution | 8 Bits |
|---|---|
| Conversion Time | 420 ns max |
| Acquisition Time | 200 ns max |
| Operating Supply Range | 3 V + 10 % to 5 V + 10 % |
| Power Dissipation (3 V) | 30 mW max (typical) |
| Integral Nonlinearity (INL) | +0.5 LSB max |
| Differential Nonlinearity (DNL) | +0.5 LSB max |
| Signal‑to‑Noise‑Distortion Ratio | 48 dB min |
| Total Harmonic Distortion | -55 dB max |
The conversion time is up to 420 ns.
The CONVST pin is sampled about 100 ns after conversion; depending on its state the device powers down.
It operates from a single 3 V or 5 V supply, each with a +10 % tolerance.