AD7641 is a 2.5V single supply powered 18-bit, 2MSPS SAR ADC. Features include: 18-bit resolution, no missing codes, 95.5dB dynamic range, 93.5dB SNR, 2.048V internal reference voltage, 10ppm/°C drift, ±VREF differential input range, 5V/3.3V/2.5V interface, support SPI®/QSPI™/MICROWIRE™/DSP, 2μW standby current, 48-lead LQFP and LFCSP_VQ package. Suitable for medical instruments, high-speed data acquisition, etc.
The AD7641 is an 18‑bit, 2 MSPS charge‑redistribution SAR analog‑to‑digital converter that operates from a single 2.5 V supply. It offers a high‑speed wideband warp mode, a normal mode, and a fast normal mode, providing flexible throughput for data‑acquisition, instrumentation, and communications applications. The device includes an internal 2.048 V reference, a temperature sensor, and both serial (SPI/QSPI/MICROWIRE/DSP‑compatible) and parallel interfaces.
The datasheet details electrical specifications such as a typical power dissipation of 75 mW at 2 MSPS, a dynamic range of 95.5 dB, and an INL of +2 LSB typical. Pin configurations, timing diagrams, absolute maximum ratings, and layout recommendations are provided to aid PCB design and system integration. Ordering information for the LQFP and LFCSP packages is also included.
| Resolution | 18 bits |
|---|---|
| Maximum Throughput | 2 MSPS (wideband warp and warp mode) |
| Power Dissipation (internal reference) | 75 mW typical @ 2 MSPS |
| Dynamic Range | 95.5 dB |
| Integral Linearity Error (typical) | +2 LSB |
| Internal Reference Voltage | 2.048 V |
| Supply Voltage | Single 2.5 V supply |
| Operating Temperature Range | -40 °C to +85 °C |
The AD7641 can sample at up to 2 MSPS in wideband warp and warp modes.
Typical power dissipation is 75 mW at 2 MSPS when the internal reference is used.
The device includes a 2.048 V internal reference.
It is specified for operation from –40 °C to +85 °C.