The AD9857 is a 200 MHz 14-bit digital upconverter produced by Analog Devices. It has a 4× to 20× programmable reference clock multiplier, an internal 32-bit quadrature DDS, FSK function, 8-bit output amplitude control, a single pin power-down function, four programmable, pin-selectable signal profiles, SIN(x)/x correction (inverse SINC function), a simplified control interface, 10 MHz serial, 2-wire or 3-wire SPI compatible, 3.3 V single supply, single-ended or differential input reference clock, 80-lead LQFP surface-mount packaging, three modes of operation: quadrature modulator mode, single-tone mode, interpolating DAC mode, and is mainly used in HFC data, telephony and video modems, wireless base station, Agile, L-Band satellite communication and other applications.
The AD9857 integrates a high‑speed direct digital synthesizer (DDS), a 14‑bit digital‑to‑analog converter (DAC), clock‑multiplier circuitry, digital filters and other DSP functions on a single 80‑lead LQFP chip. It is intended for use as a universal I/Q modulator, agile up‑converter, single‑tone DDS or interpolating DAC in communications applications where size, power and dynamic performance are critical.
The datasheet provides detailed specifications, absolute maximum ratings, pin descriptions, timing characteristics, power‑supply requirements and ordering information. It also includes performance plots, mode‑of‑operation descriptions and a revision history for engineers designing with the device.
| Supply Voltage (Vs) | 3.3 V ±5% |
|---|---|
| Resolution | 14 Bits |
| Full‑Scale Output Current | 5–20 mA |
| Maximum Internal Clock Rate | 200 MHz |
| Package | 80‑lead LQFP (ST‑80) |
The device operates from a 3.3 V supply with a tolerance of ±5 %.
The integrated DAC provides a 14‑bit resolution.
The part is offered in an 80‑lead LQFP surface‑mount package (ST‑80).