The MAX1438 is an octal, 12-bit analog-to-digital converter (ADC) with fully differential inputs, a pipelined architecture, and digital error correction incorporating a fully differential signal path. This ADC is optimized for low-power and high-dynamic performance in medical imaging instrumentation and digital communications applications. The MAX1438 operates from a 1.8V single supply and consumes only 913mW (114mW per channel) while delivering a 69.9dB (typ) signal-to-noise ratio (SNR) at a 5.3MHz input frequency. In addition to low operating power, the MAX1438 features a power-down mode for idle periods. An internal 1.24V precision bandgap reference sets the full-scale range of the ADC. A flexible reference structure allows the use of an external reference for applications requiring increased accuracy or a different input voltage range. The reference architecture is optimized for low noise. A single-ended clock controls the data-conversion process. An internal duty-cycle equalizer compensates for wide variations in clock duty cycle. An on-chip PLL generates the high-speed serial low-voltage differential signal (LVDS) clock. The MAX1438 has self-aligned serial LVDS outputs for data, clock, and frame-alignment signals. The output data is presented in two’s complement or binary format. The MAX1438 offers a maximum sample rate of 65Msps. See the Pin-Compatible Versions table below for lower-speed versions. This device is available in a small, 14mm x 14m.
The MAX1438 is an eight‑channel, 12‑bit analog‑to‑digital converter featuring fully differential inputs, a pipelined architecture, and digital error correction. It operates from a single 1.8 V supply and delivers up to 65 Msps with a typical 69.9 dB SNR at 5.3 MHz.
The device is supplied in a 100‑pin TQFP package (14 mm × 14 mm × 1 mm) rated for –40 °C to +85 °C. It includes on‑chip LVDS/SLVS serial outputs, a precision 1.24 V band‑gap reference, and a power‑down mode for idle periods.
| Resolution | 12 bits |
|---|---|
| Maximum Sample Rate | 65 Msps |
| Supply Voltage | 1.8 V (single supply) |
| Power Consumption (normal operation) | 913 mW total (114 mW per channel) |
| Signal‑to‑Noise Ratio | 69.9 dB at 5.3 MHz |
| Spurious‑Free Dynamic Range | 95 dBc at 5.3 MHz |
| Input Differential Range | 1.4 V pp |
| Package | 100‑pin TQFP, 14 mm × 14 mm × 1 mm, exposed pad |
| Operating Temperature Range | ‑40 °C to +85 °C |
The MAX1438 can sample at up to 65 Msps.
It operates from a single 1.8 V supply.
Each channel uses 114 mW, for a total of 913 mW.
It is available in a 100‑pin TQFP package measuring 14 mm × 14 mm × 1 mm with an exposed pad.