The MAX1421 is a 3.3V, 12-bit analog-to-digital converter
(ADC), featuring a fully-differential input,
pipelined, 12-stage ADC architecture with wideband
track-and-hold (T/H) and digital error correction incorporating
a fully-differential signal path. The MAX1421 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 188mW while delivering a typical signal-to-noise
ratio (SNR) of 66dB at an input frequency of
15MHz and a sampling frequency of 40Msps. 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 full-scale range of the ADC. A flexible reference
structure accommodates an internal or externally
applied buffered or unbuffered reference for applications
requiring increased accuracy or a different input
voltage range.
In addition to low operating power, the MAX1421 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 typical 2mA supply current reduction. For idle periods,
a full shutdown mode is available to maximize
power savings.
The MAX1421 provides parallel, offset binary, CMOS-compatible
three-state outputs.
The MAX1421 is available in a 7mm x 7mm, 48-pin
TQFP package, and is specified over the commercial
(0°C to +70°C) and the extended industrial (-40°C to
+85°C) temperature ranges.
Pin-compatible higher- and lower-speed versions of the
MAX1421 are also available. Please refer to the
MAX1420 data sheet for a frequency of 60Msps and
the MAX1422 data sheet for a frequency of 20Msps.
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