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Analog Devices Semiconductor Electronic Components Datasheet

AD5207 Datasheet

2-Channel/ 256-Position Digital Potentiometer

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AD5207 pdf
a
FEATURES
256-Position, 2-Channel
Potentiometer Replacement
10 k, 50 k, 100 k
Power Shut-Down, Less than 5 A
2.7 V to 5.5 V Single Supply
؎2.7 V Dual Supply
3-Wire SPI-Compatible Serial Data Input
Midscale Preset During Power-On
APPLICATIONS
Mechanical Potentiometer Replacement
Stereo Channel Audio Level Control
Instrumentation: Gain, Offset Adjustment
Programmable Voltage-to-Current Conversion
Programmable Filters, Delays, Time Constants
Line Impedance Matching
Automotive Electronics Adjustment
2-Channel, 256-Position
Digital Potentiometer
AD5207
FUNCTIONAL BLOCK DIAGRAM
A1 W1 B1
A2 W2 B2
SHDN
VDD
VSS
CS
CLK
SDI
DGND
RDAC1 REGISTER
R
RDAC2 REGISTER
R
LOGIC
AD5207
POWER-
ON
RESET
8
SERIAL INPUT REGISTER
SDO
GENERAL DESCRIPTION
The AD5207 provides dual channel, 256-position, digitally
controlled variable resistor (VR) devices that perform the same
electronic adjustment function as a potentiometer or variable
resistor. Each channel of the AD5207 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 SPI-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 VR latch. 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 10 k, 50 kor 100 k
has a ± 1% channel-to-channel matching tolerance with a nomi-
nal temperature coefficient of 500 ppm/°C. A unique switching
circuit minimizes the high glitch inherent in traditional switched
resistor designs and avoids any make-before-break or break-
before-make operation.
Each VR has its own VR latch, which holds its programmed
resistance value. These VR latches are updated from an internal
serial-to-parallel shift register, which is loaded from a standard
3-wire serial-input digital interface. Ten bits, to make up the
data word, are required and clocked into the serial input register.
The first two bits are address bits. The following eight bits are
the data bits that represent the 256 steps of the resistance value.
The reason for two address bits instead of one is to be compatible
with similar products such as AD8402 so that drop-in replacement
is possible. The address bit determines the corresponding VR
latch to be loaded with the data bits during the returned positive
edge of CS strobe. A serial data output pin at the opposite end
of the serial register allows simple daisy chaining in multiple
VR applications without additional external decoding logic.
An internal reset block will force the wiper to the midscale posi-
tion during every power-up condition. The SHDN pin forces an
open circuit on the A Terminal and at the same time shorts the
wiper to the B Terminal, achieving a microwatt power shutdown
state. When SHDN is returned to logic high, the previous latch
settings put the wiper in the same resistance setting prior to
shutdown. The digital interface remains active during shutdown;
code changes can be made to produce new wiper positions when
the device is resumed from shutdown.
The AD5207 is available in 1.1 mm thin TSSOP-14 package,
which is suitable for PCMCIA applications. All parts are guaran-
teed to operate over the extended industrial temperature range
of –40°C to +125°C.
REV. 0
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 that
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: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001


Analog Devices Semiconductor Electronic Components Datasheet

AD5207 Datasheet

2-Channel/ 256-Position Digital Potentiometer

No Preview Available !

AD5207 pdf
AD5207–SPECIFICATIONS
ELECTRICAL CHARACTERISTICS 10 k, 50 k, 100 kVERSION (VDD = 5 V, VSS = 0, VA = 5 V,
VB = 0, –40؇C < TA < +125؇C unless otherwise noted.)
Parameter
Symbol
Conditions
Min Typ1 Max Unit
DC CHARACTERISTICS
RHEOSTAT MODE
Specifications Apply to All VRs
Resistor Differential Nonlinearity2
Resistor Nonlinearity2
Nominal Resistor Tolerance3
Resistance Temperature Coefficient
Wiper Resistance
Nominal Resistance Match
R-DNL
R-INL
R
RAB/T
RW
R/RO
RWB, VA = NC
RWB, VA = NC
VAB = VDD, Wiper = No Connect
IW = 1 V/R, VDD = 5 V
Ch 1 to 2, VAB = VDD, TA = 25°C
–1 +1 LSB
–1.5 +1.5 LSB
–30 +30 %
500 ppm/°C
50 100
0.2 1
%
DC CHARACTERISTICS
POTENTIOMETER DIVIDER MODE
Specifications Apply to All VRs
Resolution
Integral Nonlinearity4
Differential Nonlinearity4
Voltage Divider Temperature
Coefficient
Full-Scale Error
Zero-Scale Error
N
INL
DNL
VW/T
VWFSE
VWZSE
VDD = 5 V, VSS = 0 V
Code = 80H
Code = FFH
Code = 00H
8 Bits
–1.5 +1.5 LSB
–1 +1 LSB
15 ppm/°C
–1.5 LSB
+1.5 LSB
RESISTOR TERMINALS
Voltage Range5
Capacitance6 AX, BX
Capacitance6 WX
Shutdown Current7
Shutdown Wiper Resistance
Common-Mode Leakage
VA, B, W
CA,B
CW
IA_SD
RW_SD
ICM
|VDD| + |VSS| 5.5 V
VSS
VDD
V
f = 1 MHz, Measured to GND, Code = 80H
45 pF
f = 1 MHz, Measured to GND, Code = 80H
VA = VDD, VB = 0 V, SHDN = 0
VA = VDD, VB = 0 V, SHDN = 0, VDD = 5 V
70
5
200
pF
µA
VA = VB = VDD/2
1 nA
DIGITAL INPUTS AND OUTPUTS
Input Logic High
Input Logic Low
Input Logic High
Input Logic Low
Output Logic High
Output Logic Low
Input Current
Input Capacitance6
POWER SUPPLIES
Power Single-Supply Range
Power Dual-Supply Range
Positive Supply Current
Negative Supply Current
Power Dissipation8
Power Supply Sensitivity, VDD
Power Supply Sensitivity, VSS
DYNAMIC CHARACTERISTICS6, 9
Bandwidth –3 dB
Bandwidth –3 dB
Bandwidth –3 dB
Total Harmonic Distortion
VW Settling Time
Resistor Noise Voltage
Crosstalk10
VIH VDD = 5 V, VSS = 0 V
VIL VDD = 5 V, VSS = 0 V
VIH VDD = 3 V, VSS = 0 V
VIL VDD = 3 V, VSS = 0 V
VOH RL = 1 kto VDD
VOL IOL = 1.6 mA, VDD = 5 V
IIL VIN = 0 V or 5 V
CIL
2.4
2.1
VDD – 0.1
10
0.8
0.6
0.4
± 10
VDD RANGE
VDD/SS RANGE
IDD
ISS
PDISS
PSS
PSS
VSS = 0 V
VIH = VDD or VIL = GND, VSS = 0 V
VIH = VDD or VIL = GND VSS = –2.5 V
VIH = 5 V or VIL = 0 V, VDD = 5 V
VDD = 5 V ± 10%, VSS = 0 V, Code = 80H
VSS = –2.5 V ± 10%, VDD = 2.5 V, Code = 80H
2.7
± 2.2
5.5
± 2.7
40
40
0.2
0.01
0.03
BW_10 k
BW_50 k
BW_100 k
THDW
tS
eN_WB
CT
RAB = 10 k
RAB = 50 k
RAB = 100 k
VA = 1 V rms, VB = 0 V, f = 1 kHz, RAB = 10 k
RAB = 10 k/50 k/100 k, ± 1 LSB Error Band
RWB = 5 k, f = 1 kHz, RS = 0
VA = 5 V, VB = 0 V
600
125
71
0.003
2/9/18
9
–65
V
V
V
V
V
V
µA
pF
V
V
µA
µA
mW
%/%
%/%
kHz
kHz
kHz
%
µs
nVHz
dB
–2– REV. 0


Part Number AD5207
Description 2-Channel/ 256-Position Digital Potentiometer
Maker Analog Devices
Total Page 16 Pages
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