19-4630; Rev 0; 7/09
Octal, 12-Bit, 64Msps, 1.8V ADC
with Serial LVDS Outputs
The MAX1438B octal, 12-bit analog-to-digital converter
(ADC) features 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 MAX1438B operates from a 1.8V sin-
gle 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 MAX1438B features a low-
power standby mode for idle periods.
An internal 1.24V precision bandgap reference sets the
full-scale range of the ADC. A flexible reference struc-
ture allows the use of an external reference for applica-
tions 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
phase-locked loop (PLL) generates the high-speed ser-
ial low-voltage differential signal (LVDS) clock.
The MAX1438B has self-aligned serial LVDS outputs for
data, clock, and frame-alignment signals. The output
data is presented in two’s-complement format.
The MAX1438B offers a maximum sample rate of
64Msps. This device is available in a small, 10mm x
10mm x 0.8mm, 68-pin thin QFN package with exposed
pad and is specified for the extended industrial (-40°C
to +85°C) temperature range.
Ultrasound and Medical Imaging
♦ Excellent Dynamic Performance
69.9dB SNR at 5.3MHz
94dBc SFDR at 5.3MHz
♦ Ultra-Low Power
114mW per Channel (Normal Operation)
♦ Serial LVDS Outputs
♦ Pin-Selectable LVDS/SLVS (Scalable Low-Voltage
♦ LVDS Outputs Support Up to 30in FR4 Backplane
♦ Test Mode for Digital Signal Integrity
♦ Fully Differential Analog Inputs
♦ Wide Differential Input Voltage Range (1.4VP-P)
♦ On-Chip 1.24V Precision Bandgap Reference
♦ Clock Duty-Cycle Equalizer
♦ Compact, 68-Pin Thin QFN Package with Exposed
♦ Evaluation Kit Available (Order MAX1437BEVKIT)
MAX1438BETK+ -40°C to +85°C
68 Thin QFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.