The MAX1422 is a 3.3V, 12-bit analog-to-digital converter (ADC) that features a fully differential input, pipelined, 12-stage ADC architecture with wideband track-and-hold (T/H) and digital error correction incorporating a fully-dif- ferential signal path. The MAX1422 is optimized for low- power, high dynamic performance applications in imaging and digital communications. The converter operates from a single 3.3V supply, consuming only 137mW while delivering a 67dB (typ) signal-to-noise ratio (SNR) at a 5MHz input frequency and a 20Msps sampling frequency. The fully-differential input stage has a small signal -3dB bandwidth of 400MHz and may be operated with single-ended inputs. An internal 2.048V precision bandgap reference sets the ADCs full-scale range. A flexible reference structure accommodates an internally or externally applied buffered or unbuffered reference for applications requiring increased accuracy or a different input volt- age range. In addition to low operating power, the MAX1422 features two power-down modes, a reference power-down, and a shutdown mode. In reference power-down, the internal bandgap reference is deactivated, resulting in a 2mA (typ) supply current reduction. For idle periods, a full shutdown mode is available to maximize power savings. The MAX1422 provides parallel, offset binary, CMOS- compatible three-state outputs. The MAX1422 is available in a 7mm ✕ 7mm ✕ 1.4mm, 48-pin TQFP package and is specified over the com- mercial (0°C to 70°C) and industrial (-40°C to 85°C) temperature ranges.
The MAX1422 is a 12‑bit, 20 Msps analog‑to‑digital converter optimized for low‑power, high‑dynamic‑performance applications such as imaging and digital communications. It operates from a single 3.3 V supply, consuming only 137 mW while delivering a typical 67 dB SNR at a 5 MHz input frequency.
The device includes a fully differential input stage with a 400 MHz small‑signal bandwidth, an internal 2.048 V bandgap reference, and three‑state parallel outputs. It is available in a 48‑pin TQFP package (7 mm × 7 mm × 1.4 mm) and supports operation over commercial (0 °C to +70 °C) and extended industrial (‑40 °C to +85 °C) temperature ranges.
| Resolution | 12 bits |
|---|---|
| Maximum Sampling Rate | 20 Msps |
| Supply Voltage | 3.3 V |
| Signal‑to‑Noise Ratio | 67 dB (typ) |
| Small‑Signal Bandwidth | 400 MHz |
| Package | 48‑pin TQFP 7 mm × 7 mm × 1.4 mm |
| Operating Temperature Range | -40 °C to +85 °C |
| Internal Reference Voltage | 2.048 V |
It operates from a single 3.3 V supply.
The MAX1422 provides two power‑down modes, a reference‑shutdown mode, and a full‑shutdown mode.
The device outputs parallel, offset‑binary, CMOS‑compatible three‑state data bits D0–D11.