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ADC12D040
Dual 12-Bit, 40 MSPS, 600 mW A/D Converter with
Internal/External Reference
General Description
The ADC12D040 is a dual, low power monolithic CMOS
analog-to-digital converter capable of converting analog in-
put signals into 12-bit digital words at 40 Megasamples per
second (MSPS), minimum. This converter uses a differential,
pipeline architecture with digital error correction and an on-
chip sample-and-hold circuit to minimize die size and power
consumption while providing excellent dynamic perfor-
mance. Operating on a single 5V power supply, the
ADC12D040 achieves 10.9 effective bits at 10 MHz input
and consumes just 600 mW at 40 MSPS, including the
reference current. The Power Down feature reduces power
consumption to 75 mW.
The differential inputs provide a full scale differential input
swing equal to 2V
REF
with the possibility of a single-ended
input. Full use of the differential input is recommended for
optimum performance. The digital outputs for the two ADCs
are available on separate 12-bit buses with an output data
format choice of offset binary or 2’s complement.
For ease of interface, the digital output driver power pins of
the ADC12D040 can be connected to a separate supply
voltage in the range of 2.4V to the digital supply voltage,
making the outputs compatible with low voltage systems.
The ADC12D040’s speed, resolution and single supply op-
eration make it well suited for a variety of applications.
This device is available in the 64-lead TQFP package and
will operate over the industrial temperature range of −40˚C to
+85˚C.
Features
n Binary/2’s complement output format
n Single supply operation
n Internal sample-and-hold
n Outputs 2.4V to 5V compatible
n TTL/CMOS compatible inputs/outputs
n Power down mode
n On-chip reference buffer
n Internal/External Reference
Key Specifications
n Resolution 12 Bits
n Conversion Rate 40 MSPS (min)
n SNR (f
IN
= 10 MHz) 68 dB (typ)
n ENOB (f
IN
= 10 MHz) 10.9 bits (typ)
n SFDR (f
IN
= 10 MHz) 80 dB (typ)
n Crosstalk 80 dB (typ)
n Data Latency 6 Clock Cycles
n Supply Voltage +5V
±
5%
n Power Consumption, Operating 600 mW (typ)
Applications
n Ultrasound and Imaging
n Instrumentation
n Communications Receivers
n Sonar/Radar
n xDSL
n Cable Modems
n DSP Front Ends
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
November 2003
ADC12D040 Dual 12-Bit, 40 MSPS, 600 mW A/D Converter with Internal/External Reference
© 2003 National Semiconductor Corporation DS200460 www.national.com
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