Complete 12-Bit 10 MSPS
Monolithic A/D Converter
a
AD872A
FEATURES
FUNCTIO NAL BLO CK D IAGRAM
Monolithic 12-Bit 10 MSPS A/ D Converter
Low Noise: 0.26 LSB RMS Referred-to-Input
No Missing Codes Guaranteed
AV
AGND AV
DV
*DRV
DGND
*DRGND
DD
SS
DD
DD
AD872A
Differential Nonlinearity Error: 0.5 LSB
Signal-to-Noise and Distortion Ratio: 68 dB
Spurious-Free Dynam ic Range: 75 dB
Pow er Dissipation: 1.03 W
Com plete: On-Chip Track-and-Hold Am plifier and
Voltage Reference
Tw os Com plem ent Binary Output Data
Out-of-Range Indicator
28-Lead Ceram ic DIP or 44-Term inal Leadless Chip
Carrier Package
V
V
INA
+
+
+
T/H
T/H
T/H
A/D
INB
DAC
DAC
DAC
A/D
A/D
A/D
4
4
3
4
CLOCK
CORRECTION LOGIC
REF IN
REF OUT
REF GND
OUTPUT BUFFERS
+2.5V
REFERENCE
OTR
*MSB
BIT2–BIT12
*OEN
MSB
*ONLY AVAILABLE ON 44-TERMINAL SURFACE MOUNT PACKAGE
P RO D UCT D ESCRIP TIO N
T he AD872A is fabricated on Analog Devices’ ABCMOS-l
process that utilizes high speed bipolar and CMOS transistors
on a single chip.
T he AD872A is a monolithic 12-bit, 10 MSPS analog-to-digital
converter with an on-chip, high performance track-and-hold
amplifier and voltage reference. T he AD872A uses a multistage
differential pipelined architecture with error correction logic to
provide 12-bit accuracy at 10 MSPS data rates and guarantees
no missing codes over the full operating temperature range. T he
AD872A is a redesigned version of the AD872 which has been
optimized for lower noise. T he AD872A is pin compatible with
the AD872, allowing the parts to be used interchangeably as sys-
tem requirements change.
T he AD872A is packaged in a 28-lead ceramic DIP and a 44-
terminal leadless ceramic surface mount package (LCC). Opera-
tion is specified from 0°C to +70°C and –55°C to +125°C.
P RO D UCT H IGH LIGH TS
T he AD872A offers a complete single-chip sampling, 12-bit
10 MSPS analog-to-digital conversion function in a 28-lead DIP
or 44-terminal LCC.
T he low noise input track-and-hold (T /H) of the AD872A is
ideally suited for high-end imaging applications. In addition, the
T /H’s high input impedance and fast settling characteristics al-
low the AD872A to easily interface with multiplexed systems
that switch multiple signals through a single A/D converter. T he
dynamic performance of the T /H also renders the AD872A suit-
able for sampling single channel inputs at frequencies up to and
beyond the Nyquist rate. T he AD872A provides both reference
output and reference input pins, allowing the onboard reference
to serve as a system reference. An external reference can also be
chosen to suit the dc accuracy and temperature drift require-
ments of the application. A single clock input is used to control
all internal conversion cycles. T he digital output data is pre-
sented in twos complement binary output format. An out-of-
range signal indicates an overflow condition, and can be used
with the most significant bit to determine low or high overflow.
Low Noise—T he AD872A features 0.26 LSB rms referred to-
input noise.
Low Power—T he AD872A at 1.03 W consumes a fraction of the
power of presently available hybrids.
On-Chip Track-and-Hold (T/H)—T he low noise, high imped-
ance T /H input eliminates the need for external buffers and can
be configured for single-ended or differential inputs.
Ease of Use—T he AD872A is complete with T /H and voltage
reference and is pin-compatible with the AD872.
Out of Range (OT R)—T he OT R output bit indicates when the
input signal is beyond the AD872A’s input range.
REV. A
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.
Tel: 781/ 329-4700
Fax: 781/ 326-8703
World Wide Web Site: http:/ / w w w.analog.com
© Analog Devices, Inc., 1997
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