AD1678_15 Datasheet, PDF (1/12 Pages) Analog Devices – 12 BIT 200KSPS SAMPLING ADC

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12 -Bit 200KSPS
Sampling AUC
FEATURES
AC Characterized and Specified
200k Conversions per Second
0
1MHz Full Power Bandwidth
500kHz Full linear Bandwidth
-20
72dB S/N+D (K Grade)
Twos Complement Data Format (Bipolar Mode)
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Straight Binary Data Format (Unipolar Mode)
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OBSOLETE 10M!} Input Impedance
8-Bit or 16-Bit Bus Interface
On-Board Reference and Clock
10V Unipolar or Bipolar Input Range
PRODUCT DESCRIPTION
The AD1678 is a 12-bit monolithic analog-to-digital converter,
consisting of a sample-hold amplifier (SHA), a microprocessor
compatible bus interface, a voltage reference and clock genera-
tion circuitry.
This product is fabricated on Analog Devices' BiMOS process,
combining low power CMOS logic with high precision, low
noise bipolar circuits; laser-trimmed thin-film resistors provide
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- 100
140
0 10 20 30 40 50 60 70 ^{80 90 100}
FREQUENCY-kHz
PRODUCT HIGHLIGHTS
1. PERFORMANCE: The ADI678 provides a throughput of
200k conversions per second. SIN + D is 72dB (K grade) at
10kHz and remains flat to beyond the Nyquist frequency.
2. INTEGRATION: The AD1678 minimizes external compo-
nent requirements by combining high speed sample-hold
amplifier (SHA), ADC, 5V reference, clock and digital inter-
face on a single chip. This provides a fully specified sampling
high accuracy. The converter utilizes a recursive subranging
AID function unattainable with discrete designs.
algorithm which includes error correction and flash converter
circuitry to achieve high speed and resolution.
3. EASE OF USE: The pinout is designed for easy board lay-
out, and the choice of.single or two read cycle output pro-
The ADI678 is specified for ac (or "dynamic") parameters such
as SIN + D ratio, THD and IMD. These parameters are impor-
vides compatibility with 16- or 8-bit buses. Factory trimming
eliminates the need for calibration modes or external trim-
tant in signal processing applications as they indicate the
ming to achieve rated performance.
AD 1678's effect on the spectral content of the input signa1.The
AD1678 offers a choice of digital interface formats; the 12 data
bits can be accessed by a 16-bit bus in a single read operation or
by an 8-bit bus in two read operations (8+4), with right or left
4. RELIABILITY: The ADI678 utilizes Analog Devices'
monolithic low power BiMOS technology. This ensures long
term reliability compared to multichip and hybrid designs.
justification. Data format is straight binary for unipolar mode
and twos complement binary for bipolar mode. The input has a
full-scale range of IOV with a full power bandwidth of 1 MHz
and a full linear bandwidth of 500kHz. High input impedance
(IOM!1) allows direct connection to unbuffered sources without
signal degradation.
The ADI678 operates from +5V and ::tl2V supplies and dissi-
pates 600mW. A 28-pin plastic DIP and a 0.6" wide ceramic
DIP are available. Contact factory for surface-mount package
options.
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.
One Technology Way; P.O. Box 9106; Norwood, MA 02062-9106
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