PRELIMINARY TECHNICAL DATA
a
Quad +15V 256-Step DigiPOTs
with Pin Selectable SPI / I
2
C Digital Interface
Preliminary Technical Data AD5263

08 AUG ’02, REV PrD
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other rights of third parties which may result from its use. No license is granted by implication
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FEATURES
256 Position
4-Channel (Independently Programmable)
20k, 50k, 200k Ohms
Low Temperature Coefficient 50ppm/
o
C
Selectable Digital Interface (3-Wire SPI Compatible or 2-Wire I
2
C
Compatible Serial Data Input)
Operating temperature range -40 to 125ºC
+5 to +15V Single-Supply; ±5V Dual-Supply Operation

APPLICATIONS
Mechanical Potentiometer Replacement
Optical Network Laser LED Adjust
Instrumentation: Gain, Offset Adjustment
Stereo Channel Audio Level Control
Automotive Electronics Adjustment
Programmable Voltage to Current Conversion
Programmable Filters, Delays, Time Constants
Line Impedance Matching
Low Resolution DAC Replacement
GENERAL DESCRIPTION
The AD5263 is the industry first quad channel, 256 position,
digital potentiometer
1
selectable digital interface. These devices
perform the same electronic adjustment function as mechanical
potentiometers or variable resistor with enhanced resolution, solid-
state reliability, and superior low temperature coefficient
performance. Each Channel of the AD5263 contains a fixed resistor
with a wiper contact that taps the fixed resistor value at a point
determined by a digital code loaded into the 3 wire SPI or 2-wire
I
2
C compatible serial-input register. The resistance between the
wiper and either end point of the fixed resistor varies linearly with
respect to the digital code transferred into the RDAC latch
1
. The
variable resistor offers a completely programmable value of
resistance, between the A terminal and the wiper or the B terminal
and the wiper. The fixed A to B terminal resistance of 20k, 50k or
200kΩ has a nominal temperature coefficient of 50 ppm/°C. Unlike
majority of the digital potentiometers in the market, these devices
can operate up to 15V or ±5V provided proper supply voltages are
furnished.
The AD5263 are available in thin narrow body TSSOP-24. All
parts are guaranteed to operate over the extended automotive
temperature range of -40°C to +125°C.
Functional Block Diagram
A1 W1 B1 A2 W2 B2 A3 W3 B3 A4 W4 B4
RDAC 1
REGISTER
RDAC 2
REGISTER
RDAC 3
REGISTER
RDAC 4
REGISTER
SERIAL INPUT
REGISTER
8
CLK /SCL
SDI / SDA
CS / AD0
V
L
GND
DIS SDO / O1NC / O2
V
DD
SHDN
RESB / AD1
V
SS
SPI / I
2
C
SELECT
LOGIC
ADDRESS
DECODER
AD5263



Figure 1 Normalized Gain Flatness Versus Frequency.