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参数资料
| 型号： | AD8803AN |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | DAC |
| 英文描述： | Octal 8-Bit TrimDAC with Power Shutdown |
| 中文描述： | OCTAL, SERIAL INPUT LOADING, 0.6 us SETTLING TIME, 8-BIT DAC, PDIP16 |
| 封装： | PLASTIC, DIP-16 |
| 文件页数： | 1/16页 |
| 文件大小： | 213K |
| 代理商： | AD8803AN |
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.
a
Octal 8-Bit TrimDAC
wth Power Shutdown
AD8801/AD8803
Analog Devices, Inc., 1995
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
FEATURES
Low Cost
Replaces Eight Potentiometers
Eight Individually Programmable Outputs
Three-Wire Serial Input
Power Shutdown
≤
25
m
W Including I
DD
and I
REF
Midscale Preset, AD8801
Separate V
REFL
Range Setting, AD8803
+3 V to +5 V Single Supply Operation
APPLICATIONS
Automatic Adjustment
Trimmer Potentiometer Replacement
Video and Audio Equipment Gain and Offset Adjustment
Portable and Battery Operated Equipment
GE NE RAL DE SCRIPT ION
T he AD8801/AD8803 provides eight digitally controlled dc
voltage outputs. T his potentiometer divider T rimDAC
allows
replacement of the mechanical trimmer function in new designs.
T he AD8801/AD8803 is ideal for dc voltage adjustment
applications.
Easily programmed by serial interfaced microcontroller ports,
the AD8801 with its midscale preset is ideal for potentiometer
replacement where adjustments start at a nominal value. Appli-
cations such as gain control of video amplifiers, voltage con-
trolled frequencies and bandwidths in video equipment,
geometric correction and automatic adjustment in CRT com-
puter graphic displays are a few of the many applications ideally
suited for these parts. T he AD8803 provides independent con-
trol of both the top and bottom end of the potentiometer divider
allowing a separate zero-scale voltage setting determined by the
V
REFL
pin. T his is helpful for maximizing the resolution of de-
vices with a limited allowable voltage control range.
FUNCT IONAL BLOCK DIAGRAM
(DACs 2–7 Omitted for Clarity)
Internally the AD8801/AD8803 contain eight voltage output
digital-to-analog converters, sharing a common reference volt-
age input.
Each DAC has its own DAC register that holds its output state.
T hese DAC registers are updated from an internal serial-to-par-
allel shift register that is loaded from a standard three-wire serial
input digital interface. Eleven data bits make up the data word
clocked into the serial input register. T his data word is decoded
where the first 3 bits determine the address of the DAC register
to be loaded with the last 8 bits of data. T he AD8801/AD8803
consumes only 5
μ
A from 5 V power supplies. In addition, in
shutdown mode reference input current consumption is also re-
duced to 5
μ
A while saving the DAC latch settings for use after
return to normal operation.
T he AD8801/AD8803 is available in 16-pin plastic DIP and the
1.5 mm height SO-16 surface mount packages.
T rimDAC is a registered trademark of Analog Devices, Inc.
DAC 8V
OUT
V
REFL
8
V
REFH
.
AD8801/AD8803
V
REFL
V
REFH
O1
O8
SHDN
RS
CS
CLK
SDI
GND
V
DD
8
8
8
8
8
3
DAC
SELECT
11-BIT
SERIAL
LATCH
D
CK
RS
1
8
ADDRESS
8-BIT
LATCH
CK
RS
8-BIT
LATCH
CK
RS
DAC 1V
OUT
V
REFL
V
REFH
See the AD8802/AD8804 for a twelve channel version of this product.
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| AD8801AN | Octal 8-Bit TrimDAC with Power Shutdown |
| AD8801AR | Octal 8-Bit TrimDAC with Power Shutdown |
| AD8804AN | 12 Channel, 8-Bit TrimDACs with Power Shutdown |
| AD8804AR | 12 Channel, 8-Bit TrimDACs with Power Shutdown |
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