The AD7730 is a complete analog front end for weigh-scale and pressure measurement applications. The device accepts low-level signals directly from a transducer and outputs a serial digital word. The input signal is applied to a proprietary pro-grammable gain front end based around an analog modulator.
The AD7730 and AD7730L are complete analog front‑ends designed for weigh‑scale and pressure measurement. They accept low‑level transducer signals, provide programmable gain, on‑chip DAC for offset/TARE removal, and output a serial digital word. Key features include 230,000‑count resolution, low offset drift (5 nV/°C) and gain drift (2 ppm/°C), and a fast‑step mode for rapid settling.
The devices operate from a single +5 V supply, support four unipolar and four bipolar input ranges (±10 mV to ±80 mV), and include self‑calibration functions. They are offered in 24‑pin DIP, 24‑lead SOIC and 24‑lead TSSOP packages (AD7730L in SOIC/TSSOP only) and are rated for –40 °C to +85 °C industrial temperature range.
| Resolution | 230,000 counts (peak‑to‑peak) |
|---|---|
| Offset Drift | 5 nV/°C |
| Gain Drift | 2 ppm/°C |
| Power Supply Rejection | 120 dB typ |
| Input Range (unipolar) | 0 mV to +10 mV (four ranges) |
The device provides a resolution of 230,000 counts (peak‑to‑peak).
It operates from a single +5 V supply.