The MAX12557 is a dual 3.3V, 14-bit analog-to-digital converter (ADC) featuring fully differential wideband track-and-hold (T/H) inputs, driving internal quantizers. The MAX12557 is optimized for low power, small size, and high dynamic performance in intermediate frequency (IF) and baseband sampling applications. This dual ADC operates from a single 3.3V supply, consuming only 610mW while delivering a typical 72.5dB signal-to-noise ratio (SNR) performance at a 175MHz input frequency. The T/H input stages accept single-ended or differential inputs up to 400MHz. In addition to low operating power, the MAX12557 features a 166µW power-down mode to conserve power during idle periods. A flexible reference structure allows the MAX12557 to use the internal 2.048V bandgap reference or accept an externally applied reference and allows the reference to be shared between the two ADCs. The reference structure allows the full-scale analog input range to be adjusted from ±0.35V to ±1.15V. The MAX12557 provides a common-mode reference to simplify design and reduce external component count in differential analog input circuits. The MAX12557 supports either a single-ended or differential input clock. User-selectable divide-by-two (DIV2) and divide-by-four (DIV4) modes allow for design flexibility and help eliminate the negative effects of clock jitter. Wide variations in the clock duty cycle are compensated with the ADCs internal duty-cycle equalizer (DCE).
The MAX12557 dual ADC from Maxim operates from a single 3.3 V supply and delivers up to 65 Msps sampling rate with 14‑bit resolution. It supports fully differential or single‑ended inputs up to 400 MHz and features a flexible reference structure, power‑down mode, and CMOS‑compatible digital outputs selectable as two’s complement or Gray code.
The device is offered in a 68‑pin thin QFN‑EP package (10 mm × 10 mm × 0.8 mm) rated for –40 °C to +85 °C. Typical performance includes 74.1 dB SNR at 70 MHz (single‑ended clock) and 83.4 dBc SFDR at the same frequency, with a power consumption of 610 mW in single‑ended clock mode.
| Sampling Rate | 65 Msps |
|---|---|
| Supply Voltage | 3.3 V |
| Power Consumption (single‑ended clock) | 610 mW |
| Power Consumption (differential clock) | 637 mW |
| Input Bandwidth | 750 MHz |
| Operating Temperature Range | –40 °C to +85 °C |
The MAX12557 can sample at up to 65 Msps.
It consumes about 610 mW in single‑ended clock mode.