19-0359; Rev 1; 2/11
Octal, 12-Bit, 65Msps, 1.8V ADC
with Serial LVDS Outputs
MAX1438
General Description
Features
The MAX1438 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 MAX1438 operates from a 1.8V single
supply and consumes only 913mW (114mW per chan-
nel) 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.
o Excellent Dynamic Performance
69.9dB SNR at 5.3MHz
95dBc SFDR at 5.3MHz
85dB Channel Isolation
o Ultra-Low Power
114mW per Channel (Normal Operation)
o Serial LVDS Outputs
o Pin-Selectable LVDS/SLVS (Scalable Low-Voltage
Signal) Mode
o LVDS Outputs Support Up to 30 Inches FR-4
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.
Backplane Connections
o Test Mode for Digital Signal Integrity
o Fully Differential Analog Inputs
o Wide Differential Input Voltage Range (1.4V
)
P-P
o On-Chip 1.24V Precision Bandgap Reference
o Clock Duty-Cycle Equalizer
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.
o Compact, 100-Pin TQFP Package with Exposed
Pad
o Evaluation Kit Available (Order MAX1438EVKIT)
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.
Ordering Information
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 14mm x 1mm, 100-pin TQFP package
with exposed pad and is specified for the extended
industrial (-40°C to +85°C) temperature range.
PART
TEMP RANGE PIN-PACKAGE
100 TQFP-EP*
(14mm x 14mm x 1mm)
MAX1438ECQ+D -40°C to +85°C
+Denotes a lead(Pb)-free/RoHS-compliant package.
D = Dry pack.
*EP = Exposed pad.
Applications
Ultrasound and Medical Imaging
Pin-Compatible Versions
Instrumentation
SAMPLING RATE
(Msps)
RESOLUTION
(BITS)
Multichannel Communications
PART
MAX1434
MAX1436
MAX1437
MAX1438
50
40
50
65
10
12
12
12
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.