AD872A_15 Datasheet, PDF (1/20 Pages) Analog Devices – Complete 12-Bit 10 MSPS Monolithic A/D Converter

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Complete 12-Bit 10 MSPS
Monolithic A/D Converter
AD872A
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Monolithic 12-Bit 10 MSPS A/D Converter
Low Noise: 0.26 LSB RMS Referred-to-Input
AV_DD AGND AV_SS
DV_DD DGND *DRV_DD *DRGND
No Missing Codes Guaranteed
AD872A
Differential Nonlinearity Error: 0.5 LSB
Signal-to-Noise and Distortion Ratio: 68 dB
V_INA
T/H
V_INB
+ T/H
+ T/H
+ A/D
Spurious-Free Dynamic Range: 75 dB
A/D DAC
A/D DAC
A/D DAC
Power Dissipation: 1.03 W
Complete: On-Chip Track-and-Hold Amplifier and
Voltage Reference
Twos Complement Binary Output Data
Out-of-Range Indicator
28-Lead Ceramic DIP or 44-Terminal Leadless Chip
E _{Carrier Package}
CLOCK
4
4
3
4
CORRECTION LOGIC
REF IN
REF OUT
REF GND
+2.5V
REFERENCE
OUTPUT BUFFERS
*OEN OTR MSB *MSB BIT2–BIT12
*ONLY AVAILABLE ON 44-TERMINAL SURFACE MOUNT PACKAGE
T _{PRODUCT DESCRIPTION}
The AD872A is a monolithic 12-bit, 10 MSPS analog-to-digital
converter with an on-chip, high performance track-and-hold
E _{amplifier and voltage reference. The AD872A uses a multistage}
differential pipelined architecture with error correction logic to
provide 12-bit accuracy at 10 MSPS data rates and guarantees
L ^{no missing codes over the full operating temperature range. The}
AD872A is a redesigned version of the AD872 which has been
optimized for lower noise. The AD872A is pin compatible with
the AD872, allowing the parts to be used interchangeably as sys-
tem requirements change.
O _{The 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-
S ^{low the AD872A to easily interface with multiplexed systems}
that switch multiple signals through a single A/D converter. The
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. The AD872A provides both reference
B _{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-
O ^{ments of the application. A single clock input is used to control}
The AD872A is fabricated on Analog Devices’ ABCMOS-l
process that utilizes high speed bipolar and CMOS transistors
on a single chip.
The 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.
PRODUCT HIGHLIGHTS
The 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.
Low Noise—The AD872A features 0.26 LSB rms referred to-
input noise.
Low Power—The AD872A at 1.03 W consumes a fraction of the
power of presently available hybrids.
On-Chip Track-and-Hold (T/H)—The 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—The AD872A is complete with T/H and voltage
reference and is pin-compatible with the AD872.
Out of Range (OTR)—The OTR output bit indicates when the
all internal conversion cycles. The digital output data is pre-
input signal is beyond the AD872A’s input range.
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.
REV. A
Information furnished by Analog Devices is believed to be accurate and
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use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
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© Analog Devices, Inc., 1997