AD7569 Analog Devices, AD7569 Datasheet
AD7569
Manufacturer Part Number
AD7569
Description
LC2MOS Complete/ 8-Bit Analog I/0 Systems
Manufacturer
Analog Devices
Datasheet
1.AD7569.pdf
(20 pages)
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a
GENERAL DESCRIPTION
The AD7569/AD7669 is a complete, 8-bit, analog I/O system
on a single monolithic chip. The AD7569 contains a high speed
successive approximation ADC with 2 s conversion time, a track/
hold with 200 kHz bandwidth, a DAC and an output buffer ampli-
fier with 1 s settling time. A temperature-compensated 1.25 V
bandgap reference provides a precision reference voltage for the
ADC and the DAC. The AD7669 is similar, but contains two
DACs with output buffer amplifiers.
A choice of analog input/output ranges is available. Using a sup-
ply voltage of +5 V, input and output ranges of zero to 1.25 V
and zero to 2.5 volts may be programmed using the RANGE in-
put pin. Using a 5 V supply, bipolar ranges of 1.25 V or
Digital interfacing is via an 8-bit I/O port and standard micro-
processor control lines. Bus interface timing is extremely fast, al-
lowing easy connection to all popular 8-bit microprocessors. A
separate start convert line controls the track/hold and ADC to
give precise control of the sampling period.
The AD7569/AD7669 is fabricated in Linear-Compatible
CMOS (LC
combining precision bipolar circuits with low power CMOS
logic. The AD7569 is packaged in a 24-pin, 0.3" wide “skinny”
DIP, a 24-terminal SOIC and 28-terminal PLCC and LCCC
packages. The AD7669 is available in a 28-pin, 0.6" plastic
DIP, 28-terminal SOIC and 28-terminal PLCC package.
REV. B
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.
2.5 V may be programmed.
FEATURES
2 s ADC with Track/Hold
1 s DAC with Output Amplifier
On-Chip Bandgap Reference
Fast Bus Interface
Single or Dual 5 V Supplies
AD7569, Single DAC Output
AD7669, Dual DAC Output
2
MOS), an advanced, mixed technology process
Complete, 8-Bit Analog I/0 Systems
PRODUCT HIGHLIGHTS
1. Complete Analog I/O on a Single Chip.
2. Dynamic Specifications for DSP Users.
3. Fast Microprocessor Interface.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
The AD7569/AD7669 provides everything necessary to
interface a microprocessor to the analog world. No external
components or user trims are required and the overall accu-
racy of the system is tightly specified, eliminating the need
to calculate error budgets from individual component
specifications.
In addition to the traditional ADC and DAC specifications,
the AD7569/AD7669 is specified for ac parameters, includ-
ing signal-to-noise ratio, distortion and input bandwidth.
The AD7569/AD7669 has bus interface timing compatible
with all modern microprocessors, with bus access and relin-
quish times less than 75 ns and write pulse width less than
80 ns.
AD7569 FUNCTIONAL BLOCK DIAGRAM
AD7669 FUNCTIONAL BLOCK DIAGRAM
World Wide Web Site: http://www.analog.com
AD7569/AD7669
© Analog Devices, Inc., 1996
LC
2
MOS
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