AD7628BQ Analog Devices, AD7628BQ Datasheet

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AD7628BQ

Manufacturer Part Number
AD7628BQ
Description
0 to +17.0V; 450mW; CMOS dual 8-bit buffered multiplying DAC. For disc drivers, programmable filters, X-Y graphics, gain/attenuation
Manufacturer
Analog Devices
Datasheet

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a
GENERAL DESCRIPTION
The AD7628 is a monolithic dual 8-bit digital/analog converter
featuring excellent DAC-to-DAC matching. It is available in
small 0.3" wide 20-pin DIPs and in 20-terminal surface mount
packages.
Separate on-chip latches are provided for each DAC to allow
easy microprocessor interface.
Data is transferred into either of the two DAC data latches via a
common 8-bit TTL/CMOS compatible input port. Control in-
put DAC A/DAC B determines which DAC is to be loaded.
The AD7628’s load cycle is similar to the write cycle of a ran-
dom access memory, and the device is bus compatible with most
8-bit microprocessors, including 6502, 6809, 8085, Z80.
The device operates from a +12 V to +15 V power supply and is
TTL-compatible over this range. Power dissipation is a low
20 mW.
Both DACs offer excellent four quadrant multiplication charac-
teristics with a separate reference input and feedback resistor for
each DAC.
REV. A
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.
FEATURES
On-Chip Latches for Both DACs
+12 V to +15 V Operation
DACs Matched to 1%
Four Quadrant Multiplication
TTL/CMOS Compatible from +12 V to +15 V
Latch Free (Protection Schottkys not Required)
APPLICATIONS
Disk Drives
Programmable Filters
X-Y Graphics
Gain/Attenuation
PRODUCT HIGHLIGHTS
1. DAC to DAC matching: since both of the AD7628 DACs
2. Small package size: combining the inputs to the on-chip
3. TTL-Compatibility: All digital inputs are TTL-compatible
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
are fabricated at the same time on the same chip, precise
matching and tracking between DAC A and DAC B is inher-
ent. The AD7628’s matched CMOS DACs make a whole
new range of applications circuits possible, particularly in the
audio, graphics and process control areas.
DAC latches into a common data bus and adding a DAC A/
DAC B select line has allowed the AD7628 to be packaged in
a small 20-pin 0.3" wide DIP, 20-pin SOIC, 20-terminal
PLCC and 20-terminal LCC.
over a +12 V to +15 V power supply range.
FUNCTIONAL BLOCK DIAGRAM
Buffered Multiplying DAC
World Wide Web Site: http://www.analog.com
CMOS Dual 8-Bit
© Analog Devices, Inc., 1996
AD7628

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AD7628BQ Summary of contents

Page 1

... DAC. REV. A 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 ...

Page 2

AD7628–SPECIFICATIONS Parameter STATIC PERFORMANCE Resolution 8 Relative Accuracy 1/2 Differential Nonlinearity 1 Gain Error 2 3 Gain Temperature Coefficient Gain/ Temperature Output Leakage Current OUT A (Pin 2) 50 OUT B (Pin 20) 50 Input Resistance (V ...

Page 3

... Model Range Accuracy Error AD7628KN – +85 C 1/2 LSB AD7628KP – +85 C 1/2 LSB AD7628KR – +85 C 1/2 LSB AD7628BQ – +85 C 1/2 LSB AD7628TQ – +125 C 1/2 LSB AD7628TE – +125 C 1/2 LSB NOTES 1 To order MIL-STD-883, Class B process parts, add /883B to part number. ...

Page 4

... V transfer function of the R-2R ladder. For further information on CMOS multiplying D/A converters, refer to “CMOS DAC Application Guide, 2ND Edition” avail- DAC A DAC B able from Analog Devices, Publication Number G872a–15–4/86. WRITE HOLD HOLD WRITE HOLD ...

Page 5

Figure 4. Dual DAC Unipolar Binary Operation (2 Quadrant Multiplication). See Table I. Figure 5. Dual DAC Bipolar Operation (4 Quadrant Multiplication). See Table II. Table I. Unipolar Binary Code Table DAC Latch Contents Analog Output MSB LSB (DAC A ...

Page 6

AD7628 APPLICATIONS INFORMATION Application Hints To ensure system performance consistent with AD7628 specifi- cations, careful attention must be given to the following points: 1. GENERAL GROUND MANAGEMENT transient voltages between the AD7628 AGND and DGND can cause noise ...

Page 7

MICROPROCESSOR INTERFACE Figure 11. AD7628 Dual DAC to 6800 CPU Interface PROGRAMMABLE WINDOW COMPARATOR Figure 13. Digitally Programmable Window Comparator (Upper and Lower Limit Detector) PROGRAMMABLE STATE VARIABLE FILTER Figure 14. Digitally Controlled State Variable Filter In this state, variable ...

Page 8

AD7628 DIGITALLY CONTROLLED DUAL TELEPHONE ATTENUATOR In this configuration, the AD7628 functions as a 2-channel digitally controlled attenuator; ideal for stereo audio and tele- phone signal level control applications. Table IV gives input codes vs. attenuation for ...

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