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Analog Devices Semiconductor Electronic Components Datasheet

AD8801 Datasheet

Octal 8-Bit TrimDAC with Power Shutdown

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AD8801 pdf
a
Octal 8-Bit TrimDAC
with Power Shutdown
AD8801/AD8803
FEATURES
Low Cost
Replaces Eight Potentiometers
Eight Individually Programmable Outputs
Three-Wire Serial Input
Power Shutdown 25 W Including IDD and IREF
Midscale Preset, AD8801
Separate VREFL 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
GENERAL DESCRIPTION
The AD8801/AD8803 provides eight digitally controlled dc
voltage outputs. This potentiometer divider TrimDAC® allows
replacement of the mechanical trimmer function in new designs.
The 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. The 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
VREFL pin. This is helpful for maximizing the resolution of de-
vices with a limited allowable voltage control range.
FUNCTIONAL BLOCK DIAGRAM
(DACs 2–7 Omitted for Clarity)
VREFH
VREFL
VDD
GND
SDI
CLK
CS
AD8801/AD8803
1
DAC
SELECT
8
ADDRESS
3
11-BIT
SERIAL 8
LATCH
D
CK RS
8 8-BIT
LATCH
CK RS
8 8-BIT 8
LATCH
CK RS
VREFH
DAC 1 VOUT
VREFL
8
......
VREFH
DAC 8 VOUT
VREFL
8
O1
O8
RS SHDN
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.
These 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. This 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. The AD8801/AD8803
consumes only 5 µA from 5 V power supplies. In addition, in
shutdown mode reference input current consumption is also re-
duced to 5 µA while saving the DAC latch settings for use after
return to normal operation.
The AD8801/AD8803 is available in 16-pin plastic DIP and the
1.5 mm height SO-16 surface mount packages.
See the AD8802/AD8804 for a twelve channel version of this product.
TrimDAC is a registered trademark of Analog Devices, Inc.
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.
© 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


Analog Devices Semiconductor Electronic Components Datasheet

AD8801 Datasheet

Octal 8-Bit TrimDAC with Power Shutdown

No Preview Available !

AD8801 pdf
AD8801/AD8803–SPECIFICATIONS (VDD = +3 V ؎ 10% or +5 V ؎ 10%, VREFH = +VDD, VREFL = 0 V, –40؇C
TA +85؇C unless otherwise noted)
Parameter
Symbol Conditions
Min Typ1 Max
Units
STATIC ACCURACY
Specifications Apply to All DACs
Resolution
Integral Nonlinearity Error
Differential Nonlinearity
Full-Scale Error
Zero-Code Error
DAC Output Resistance
Output Resistance Match
REFERENCE INPUT
Voltage Range2
Input Resistance
Reference Input Capacitance3
DIGITAL INPUTS
Logic High
Logic Low
Logic High
Logic Low
Input Current
Input Capacitance3
POWER SUPPLIES4
Power Supply Range
Supply Current (CMOS)
Supply Current (TTL)
Shutdown Current
Power Dissipation
Power Supply Sensitivity
Power Supply Sensitivity
DYNAMIC PERFORMANCE3
VOUT Settling Time (Positive or Negative)
Crosstalk
N
INL
DNL
GFSE
VZSE
ROUT
R/RO
VREFH
VREFL
RREFH
CREF0
CREF1
VIH
VIL
VIH
VIL
IIL
CIL
VDD Range
IDD
IDD
IREFH
PDISS
PSRR
PSRR
tS
CT
Guaranteed Monotonic
Pin Available on AD8803 Only
Digital Inputs = 55H, VREFH = VDD
Digital Inputs All Zeros
Digital Inputs All Ones
VDD = +5 V
VDD = +5 V
VDD = +3 V
VDD = +3 V
VIN = 0 V or +5 V
VIH = VDD or VIL = 0 V
VIH = 2.4 V or VIL = 0.8 V, VDD= +5.5 V
SHDN = 0
VIH = VDD or VIL = 0 V, VDD = +5.5 V
VDD = 5 V ± 10%, VREFH = +4.5 V
VDD = 3 V ± 10%, VREFH = +2.7 V
± 1/2 LSB Error Band
See Note 5, f = 100 kHz
8
–1.5
–1
–4
–0.5
3
0
0
2.4
2.1
2.7
± 1/2 +1.5
± 1/4 +1
–2.8 +0.5
± 0.1 +0.5
58
1
VDD
VDD
2
25
25
0.8
0.6
±1
5
0.01
1
0.01
0.001
0.01
5.5
5
4
5
27.5
0.002
0.6
50
Bits
LSB
LSB
LSB
LSB
k
%
V
V
k
pF
pF
V
V
V
V
µA
pF
V
µA
mA
µA
µW
%/%
%/%
µs
dB
SWITCHING CHARACTERISTICS3, 6
Input Clock Pulse Width
Data Setup Time
Data Hold Time
CS Setup Time
CS High Pulse Width
Reset Pulse Width
CLK Rise to CS Rise Hold Time
CS Rise to Next Rising Clock
tCH, tCL
tDS
tDH
tCSS
tCSW
tRS
tCSH
tCS1
Clock Level High or Low
15
5
5
10
10
60
15
10
ns
ns
ns
ns
ns
ns
ns
ns
NOTES
1Typical values represent average readings measured at +25 °C.
2VREFH can be any value between GND and VDD, for the AD8803 VREFL can be any value between GND and VDD.
3Guaranteed by design and not subject to production test.
4Digital Input voltages VIN = 0 V or VDD for CMOS condition. DAC outputs unloaded. PDISS is calculated from (IDD × VDD).
5Measured at a VOUT pin where an adjacent VOUT pin is making a full-scale voltage change.
6See timing diagram for location of measured values. All input control voltages are specified with tR = tF = 2 ns (10% to 90% of VDD) and timed from a voltage
level of 1.6 V.
Specifications subject to change without notice.
–2– REV. A


Part Number AD8801
Description Octal 8-Bit TrimDAC with Power Shutdown
Maker Analog Devices
Total Page 16 Pages
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