AD1679_15 Datasheet, PDF (1/12 Pages) Analog Devices – 14 BIT 100 KSPS COMPLETE SAMPLING ADC

~ ANALOG
W DEVICES
14-Bit 100 KSPS
CompletSe amplinAgDC
FEATURES
AC Characterized and Specified
100k Conversions per Second
1 MHz Full Power Bandwidth
500 kHz Full Linear Bandwidth
80 dB S/N+D (K Grade)
n 10
-20
-30
!1J -40
Twos Complement Data Format (Bipolar Mode)
.c:, -50
Straight Binary Data Format (Unipolar Mode)
:_>>_- -60
OBSOLETE 10MO Input Impedance
8-Bit Bus Interface (See AD1779 for 16-Bit Interface)
On-Board Reference and Clock
10 V Unipolar or Bipolar Input Range
PRODUCT DESCRIPTION
The AD1679 is a complete, 14-bit monolithic analog-to-digital
converter, consisting of a sample-hold amplifier (SHA), a micro-
processor compatible bus interface, a voltage reference and clock
generation circuitry.
The 14 data bits are accessed by an 8-bit bus in two read opera-
tions (8+6), with left justification. Data format is straig~t binary
for unipolar mode and twos complement binary for bipolar
mode. The input has a full-scale range of 10 V with a full power
:^~:; ^-70
.. -80 '.n
-100
-110
-120
-130
!
-i
10 15 20 25 30 35 40 45 50
FREQUENCY-kHz
PRODUCT HIGHLIGHTS
I. COMPLETE INTEGRATION: The AD1679 minimizes
external component requirements by combining a high speed
sample-hold amplifier (SHA), ADC, 5 V reference, clock and
digital interface on a single chip. This provides a fully speci-
fied sampling AID function unattainable with discrete
designs.
2. PERFORMANCE: The AD1679 provides a throughput of
lOOkconversions per second. SIN+ D is 80 dB (K grade) at
bandwidth of 1 MHz and a full linear bandwidth of 500 kHz.
10 kHz and remains flat beyond the Nyquist frequency.
High input impedance (10 Mil) allows direct connection to
unbuffered sources without signal degradation.
3. SPECIFICATIONS: The AD1679 is specified for ac (or
"dynamic") parameters such as SIN+ D ratio, THD and
This product is fabricated on Analog Devices' BiMOS process,
IMD. These parameters are important in signal processing
combining low power CMOS logic with high precision, low
applications as they indicate the AD 1679's effect on the spec-
noise bipolar circuits; laser-trimmed thin-film resistors provide
tral content of the input signal
high accuracy. The converter utilizes a recursive subranging
algorithm, which includes error correction, and flash converter
circuitry to achieve high speed and resolution.
The AD1679 operates from +5 V and :t12 V supplies and dissi-
pates 720 mW. A 28-pin plastic DIP and a 0.6" wide ceramic
DIP are available. Contact factory for surface-mount package
options.
4. EASE OF USE: The pinout is designed for easy board
layout, and the two read output provides compatibility
with 8-bit buses. Factory trimming eliminates the need for
calibration modes or external trimming to achieve rated
performance.
S. RELIABILITY: The AD1679 utilizes Analog Devices'
monolithic BiMOS technology. This ensures long term reli-
ability compared to multichip and hybrid designs.
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
Tel: [phone]
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