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AD1672AP Datasheet

  • AD1672AP

  • Complete 12-Bit, 3 MSPS Monolithic A/D Converter

  • 20頁(yè)

  • AD

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a
FEATURES
Single Supply
Pin Configurable Input Voltage Ranges
Power Dissipation: 240 mW
No Missing Codes Guaranteed
Differential Nonlinearity Error: 0.5 LSB
Complete: On-Chip Sample-and-Hold Amplifier and
Voltage Reference
Signal-to-Noise and Distortion Ratio: 68 dB
Spurious-Free Dynamic Range: 鈥?7 dB
Out of Range Indicator
Binary Output Data
Digital I/Os Compatible with +5 V or +3.3 V Logic
28-Pin PLCC Package
Complete 12-Bit, 3 MSPS
Monolithic A/D Converter
AD1672
input combined with the power and cost savings over previously
available solutions will enable new designs in communications,
imaging and medical applications. The AD1672 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
requirements of the application. The digital output data is pre-
sented in a straight binary output format for the unipolar input
ranges of 0 V to 2.5 V and 0 V to 5.0 V. For the bipolar input
range of 鈥?.5 V to +2.5 V, the digital output data is presented in
an offset binary format. An out-of-range (OTR) signal indicates
an overflow condition. It can be used with the most significant
bit to determine low or high overflow.
The AD1672 is packaged in a 28-pin PLCC package and is
specified for operation from 鈥?0擄C to +85擄C.
PRODUCT HIGHLIGHT
PRODUCT DESCRIPTION
The AD1672 is a monolithic, single supply 12-bit, 3 MSPS
analog-to-digital converter with an on-chip, high performance
sample-and-hold amplifier (SHA) and voltage reference. The
AD1672 uses a multistage pipelined architecture with output
error correction logic to provide 12-bit accuracy at 3 MSPS data
rates and guarantees no missing codes over the full operating
temperature range. The AD1672 combines a high performance
BiCMOS process and a novel architecture to achieve its high
performance levels.
The fast settling input SHA is equally suited for both multi-
plexed systems that switch negative to positive full-scale voltage
levels in successive channels and sampling single-channel inputs
at frequencies up to the Nyquist rate. The AD1672鈥檚 wideband
The AD1672 offers a complete single-chip sampling 12-bit,
3 MSPS analog-to-digital conversion function in a 28-pin
PLCC package.
The AD1672 at 240 mW consumes a fraction of the power of
presently available solutions and provides exceptional perfor-
mance relative to other monolithic solutions.
OUT OF RANGE (OTR)鈥擳he OTR output bit indicates
when the input signal is beyond the AD1672鈥檚 input range.
Ease-of-Use鈥擳he single supply AD1672 is complete with SHA
voltage reference and pin strappable input ranges. It is compat-
ible with a wide range of amplifiers.
FUNCTIONAL BLOCK DIAGRAM
AIN1 & 2
THA
REF IN
REFCOM
REF
AMP
ADC
AD1672
THA
THA
DAC
ADC
THA
DAC
ADC
DAC
ADC
NOISE
REDUCTION
DAC
AMP
4
4
3
CORRECTION LOGIC
BANDGAP
REFERENCE
REFCOM
LATCHES
CLOCK TIMER
4
2.5V REF
OUTPUT
OUTPUT DATA
12 BITS
CLOCK INPUT
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
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
otherwise under any patent or patent rights of Analog Devices.
漏 Analog Devices, Inc., 1995
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703

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