Rainbow Electronics ADC12040 - Manual

ADC12040
12-Bit, 40 MSPS, 340 mW A/D Converter with Internal
Sample-and-Hold
General Description
The ADC12040 is a monolithic CMOS analog-to-digital con-
verter capable of converting analog input signals into 12-bit
digital words at 40 Megasamples per second (MSPS), mini-
mum. 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 performance. Operating on a
single 5V power supply, this device consumes just 340 mW
at 40 MSPS, including the reference current. The Power
Down feature reduces power consumption to 40 mW.
The differential inputs provide a full scale input swing equal
to V
REF
with the possibility of a single-ended input. Full use
of the differential input is recommended for optimum perfor-
mance. For ease of use, the buffered, high impedance,
single-ended reference input is converted on-chip to a differ-
ential reference for use by the processing circuitry. Output
data format is 12-bit offset binary.
This device is available in the 32-lead LQFP package and
will operate over the industrial temperature range of −40˚C to
+85˚C.
Features
n Single supply operation
n Internal sample-and-hold
n Outputs 2.5V to 5V compatible
n TTL/CMOS compatible input/outputs
n Low power consumption
n Power down mode
n On-chip reference buffer
Key Specifications
n Resolution 12 Bits
n Conversion Rate 40 MSPS (min)
n DNL ± 0.4 LSB (typ)
n INL ± 0.7 LSB (typ)
n SNR (f
IN
= 10MHz) 69 dB (typ)
n ENOB (f
IN
= 10MHz) 11.2 bits (typ)
n Data Latency 6 Clock Cycles
n Supply Voltage +5V ± 5%
n Power Consumption, 40 MHz 340 mW (typ)
Applications
n Ultrasound and Imaging
n Instrumentation
n Cellular Base Stations/Communications Receivers
n Sonar/Radar
n xDSL
n Wireless Local Loops/Cable Modems
n HDTV/DTV
n DSP Front Ends
Connection Diagram
20014801
June 2003
ADC12040
12-Bit,
40
MSPS,
340
mW
A/D
Converter
with
Internal
Sample-and-Hold
© 2003 National Semiconductor Corporation DS200148 www.national.com