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PDF AD7628 Data sheet ( Hoja de datos )
| Número de pieza | AD7628 | |
| Descripción | CMOS Dual 8-Bit Buffered Multiplying DAC | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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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
CMOS Dual 8-Bit
Buffered Multiplying DAC
AD7628
FUNCTIONAL BLOCK DIAGRAM
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.
PRODUCT HIGHLIGHTS
1. DAC to DAC matching: since both of the AD7628 DACs
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.
2. Small package size: combining the inputs to the on-chip
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.
3. TTL-Compatibility: All digital inputs are TTL-compatible
over a +12 V to +15 V power supply range.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1996
1 page  
AD7628
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
Table II. Bipolar (Offset Binary) Code Table
DAC Latch Contents
MSB LSB
11111111
10000001
10000000
01111111
00000001
00000000
Analog Output
(DAC A or DAC B)
–V
IN
255
256
–V
IN
129
256
–V IN
128
256
=
–
V IN
2
–V
IN
127
256
–V
IN
1
256
–V IN
0
256
=
0
DAC Latch Contents
MSB LSB
11111111
10000001
10000000
01111111
00000001
00000000
Analog Output
(DAC A or DAC B)
+V
IN
127
128
+V
IN
1
128
0
–V
IN
1
128
–V
IN
127
128
128
–V IN 128
( )NOTE: 1 LSB = (2–8)(VIN) =
1
256
V IN
( )NOTE: 1 LSB = (2–7)(VIN) =
1
128
V IN
Table III. Recommended Trim Resistor Values
Trim
Resistor
R1; R3
R2; R4
K/B/T
500
150
REV. A
–5–
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AD7628.PDF ] | |
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