General Description
The MAX1217 dual, monolithic, 12-bit, 125Msps analog-
to-digital converter (ADC) provides outstanding dynam-
ic performance up to a 250MHz input frequency. The
device operates with conversion rates up to 125Msps
while consuming only 650mW per channel.
At 125Msps and an input frequency of 200MHz, the
MAX1217 achieves an 80dBc spurious-free dynamic
range (SFDR) with excellent 65.3dB signal-to-noise ratio
(SNR) at 200MHz. The SNR remains flat (within 3dB) for
input tones up to 200MHz. This makes the MAX1217
ideal for wideband applications such as communications
receivers, cable head-end receivers, and power-amplifi-
er predistortion in cellular base-station transceivers.
The MAX1217 operates from a single 1.8V power sup-
ply. The analog inputs of each channel are designed
for AC-coupled, differential or single-ended operation.
The ADC also features a selectable on-chip divide-by-2
clock circuit that accepts clock frequencies as high as
250MHz and reduces the phase noise of the input
clock source. A low-voltage differential signal (LVDS)
sampling clock is recommended for best performance.
The converter’s digital outputs are LVDS compatible
and the data format can be selected to be either two’s
complement or offset binary.
The MAX1217 is available in a 100-pin TQFP package
with exposed paddle and is specified over the extend-
ed (-40°C to +85°C) temperature range. Refer to the
MAX1218 (170Msps) and the MAX1219 (210Msps)
data sheets for higher speed, pin-compatible devices.
Applications
Cable Modem Termination Systems (CMTS)
Cable Digital Return Path Transmitters
Cellular Base-Station Power-Amplifier Linearization
IF and Baseband Digitization
ATE and Instrumentation
Radar Systems
Features
125Msps Conversion Rate
Excellent Low-Noise Characteristics
SNR = 67dB at f
IN
= 100MHz
SNR = 65.3dB at f
IN
= 200MHz
Excellent Dynamic Range
SFDR = 85dBc at f
IN
= 100MHz
SFDR = 80dBc at f
IN
= 200MHz
Single 1.8V Supply
1.3W Power Dissipation at f
SAMPLE
= 125Msps
and f
IN
= 10MHz
On-Chip Track-and-Hold Amplifier
Internal 1.24V Bandgap Reference
On-Chip Selectable Divide-by-2 Clock Input
LVDS Digital Outputs with Data Clock Output
EV Kit Available (Order MAX1217EVKIT)
MAX1217
1.8V, Dual, 12-Bit, 125Msps ADC for
Broadband Applications
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Maxim Integrated Products
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