ADC12DL065
Dual 12-Bit, 65 MSPS, 3.3V, 360mW A/D Converter
General Description
The ADC12DL065 is a dual, low power monolithic CMOS
analog-to-digital converter capable of converting analog in-
put signals into 12-bit digital words at 65 Megasamples per
second (MSPS). This converter uses a differential, pipeline
architecture with digital error correction and an on-chip
sample-and-hold circuit to minimize power consumption
while providing excellent dynamic performance and a 250
MHz Full Power Bandwidth. Operating on a single +3.3V
power supply, the ADC12DL065 achieves 11.0 effective bits
at nyquist and consumes just 360 mW at 65 MSPS, including
the reference current. The Power Down feature reduces
power consumption to 36 mW.
The differential inputs provide a full scale differential input
swing equal to 2 times V
REF
with the possibility of a single-
ended input. Full use of the differential input is recom-
mended for optimum performance. The digital outputs from
the two ADC’s are available on a single multiplexed 12-bit
bus or on separate buses. Duty cycle stabilization and output
data format are selectable using a quad state function pin.
The output data can be set for offset binary or two’s comple-
ment.
To ease interfacing to lower voltage systems, the digital
output driver power pins of the ADC12DL065 can be con-
nected to a separate supply voltage in the range of 2.4V to
the analog supply voltage. This device is available in the
64-lead TQFP package and will operate over the industrial
temperature range of −40˚C to +85˚C. An evaluation board is
available to ease the evaluation process.
Features
n Single +3.3V supply operation
n Internal sample-and-hold
n Internal reference
n Outputs 2.4V to 3.6V compatible
n Power down mode
n Duty Cycle Stabilizer
n Multiplexed Output Mode
Key Specifications
n Resolution 12 Bits
n DNL ±0.4 LSB (typ)
n SNR (f
IN
= 10 MHz) 69 dB (typ)
n SFDR (f
IN
= 10 MHz) 86 dB (typ)
n Data Latency 7 Clock Cycles
n Power Consumption
n -- Operating 360 mW (typ)
n -- Power Down Mode 36 mW (typ)
Applications
n Ultrasound and Imaging
n Instrumentation
n Communications Receivers
n Sonar/Radar
n xDSL
n Cable Modems
n DSP Front Ends
Connection Diagram
20100101
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
May 2005
ADC12DL065
Dual
12-Bit,
65
MSPS,
3.3V
,
360mW
A/D
Converter
© 2005 National Semiconductor Corporation DS201001 www.national.com