AD1672_15 Datasheet, PDF (1/20 Pages) Analog Devices – Complete 12-Bit, 3 MSPS Monolithic A/D Converter

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Complete 12-Bit, 3 MSPS
Monolithic A/D Converter
AD1672
FEATURES
input combined with the power and cost savings over previously
Single Supply
available solutions will enable new designs in communications,
Pin Configurable Input Voltage Ranges
imaging and medical applications. The AD1672 provides both
Power Dissipation: 240 mW
reference output and reference input pins allowing the onboard
No Missing Codes Guaranteed
reference to serve as a system reference. An external reference
Differential Nonlinearity Error: 0.5 LSB
can also be chosen to suit the dc accuracy and temperature drift
Complete: On-Chip Sample-and-Hold Amplifier and
requirements of the application. The digital output data is pre-
OBSOLETE Voltage Reference
Signal-to-Noise and Distortion Ratio: 68 dB
Spurious-Free Dynamic Range: –77 dB
Out of Range Indicator
Binary Output Data
Digital I/Os Compatible with +5 V or +3.3 V Logic
28-Pin PLCC Package
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
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 –2.5 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 –40°C to +85°C.
PRODUCT HIGHLIGHT
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)—The OTR output bit indicates
performance levels.
when the input signal is beyond the AD1672’s input range.
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’s wideband
Ease-of-Use—The 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
REF IN
REFCOM
NOISE
REDUCTION
2.5V REF
OUTPUT
REF
AMP
DAC
AMP
BANDGAP
REFERENCE
REFCOM
AD1672
THA
ADC _DAC
THA
ADC _DAC
THA
ADC _DAC
THA
ADC
4
4
3
4
CORRECTION LOGIC
LATCHES
CLOCK TIMER
OUTPUT DATA
12 BITS
CLOCK INPUT
REV. 0
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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.
© Analog Devices, Inc., 1995
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