AD8403AN1 Analog Devices, AD8403AN1 Datasheet

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AD8403AN1

Manufacturer Part Number
AD8403AN1
Description
Manufacturer
Analog Devices
Datasheet
1.AD8403AN1.pdf (20 pages)
a
GENERAL DESCRIPTION
The AD8400/AD8402/AD8403 provide a single, dual or quad
channel, 256 position digitally controlled variable resistor (VR) device.
These devices perform the same electronic adjustment function as
a potentiometer or variable resistor. The AD8400 contains a single
variable resistor in the compact SO-8 package. The AD8402 contains
two independent variable resistors in space-saving SO-14 surface-
mount packages. The AD8403 contains four independent variable
resistors in 24-lead PDIP, SOIC, and TSSOP packages. Each part
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
controlling serial input register. The resistance between the wiper and
either endpoint of the fixed resistor varies linearly with respect to the
digital code transferred into the VR latch. Each 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 1 kΩ, 10 kΩ, 50 kΩ, or 100 kΩ has a ±1%
channel-to-channel matching tolerance with a nominal temperature
coefficient of 500 ppm/°C. A unique switching circuit minimizes the
high glitch inherent in traditional switched resistor designs avoiding
any make-before-break or break-before-make operation.
Each VR has its own VR latch that holds its programmed resistance
value. These VR latches are updated from an SPI compatible serial-
to-parallel shift register that is loaded from a standard 3-wire
serial-input digital interface. Ten data bits make up the data word
clocked into the serial input register. The data word is decoded where
the first two bits determine the address of the VR latch to be loaded,
the last eight bits are data. 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.
The reset (RS) pin forces the wiper to the midscale position by
loading 80
H
into the VR latch. The SHDN pin forces the resistor
to an end-to-end open circuit condition on the A terminal and
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 is still active in
shutdown so that code changes can be made that will produce
new wiper positions when the device is taken out of shutdown.
The AD8400 is available in both the SO-8 surface-mount and the
8-lead plastic DIP package.
The AD8402 is available in both surface mount (SO-14) and
14-lead plastic DIP packages, while the AD8403 is available in a
narrow body 24-lead plastic DIP and a 24-lead surface-mount
package. The AD8402/AD8403 are also offered in the 1.1 mm thin
TSSOP-14/TSSOP-24 packages for PCMCIA applications. All
parts are guaranteed to operate over the extended industrial tem-
perature range of –40°C to +125°C.
DGND
CLK
V
SDI
CS
DD
100
75
50
25
0
AD8400/AD8402/AD8403
0
AD8403
FUNCTIONAL BLOCK DIAGRAM
Digital Potentiometers
R
WA
D
SELECT
A1, A0
CK Q RS
SERIAL
LATCH
64
10-BIT
DAC
SDO
2
1
2
3
4
CODE – Decimal
8
1-/2-/4-Channel
128
LATCH
LATCH
CK RS
LATCH
CK RS
LATCH
CK RS
CK RS
8-BIT
8-BIT
8-BIT
8-BIT
RS
8
8
8
8
192
RDAC1
RDAC2
RDAC3
RDAC4
SHDN
SHDN
SHDN
SHDN
SHDN
R
WB
A1
W1
B1
AGND1
A2
W2
B2
AGND2
A3
W3
B3
AGND3
A4
W4
B4
AGND4
255

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AD8403AN1 Summary of contents

Page 1

GENERAL DESCRIPTION The AD8400/AD8402/AD8403 provide a single, dual or quad channel, 256 position digitally controlled variable resistor (VR) device. These devices perform the same electronic adjustment function as a potentiometer or variable resistor. The AD8400 contains a single variable ...

Page 2

AD8400/AD8402/AD8403–SPECIFICATIONS ELECTRICAL CHARACTERISTICS–10 k VERSION Parameter DC CHARACTERISTICS RHEOSTAT MODE (Specifications Apply to All VRs) 2 Resistor Differential NL 2 Resistor Nonlinearity 3 Nominal Resistance Resistance Tempco Wiper Resistance Nominal Resistance Match DC CHARACTERISTICS POTENTIOMETER DIVIDER Specifications Apply to All ...

Page 3

SPECIFICATIONS ( ELECTRICAL CHARACTERISTICS–50 k and 100 k Parameter DC CHARACTERISTICS RHEOSTAT MODE (Specifications Apply to All VRs) 2 Resistor Differential NL 2 Resistor Nonlinearity 3 Nominal Resistance Resistance Tempco Wiper Resistance Nominal Resistance Match DC ...

Page 4

AD8400/AD8402/AD8403–SPECIFICATIONS ELECTRICAL CHARACTERISTICS–1 k VERSION Parameter DC CHARACTERISTICS RHEOSTAT MODE Specifications Apply to All VRs 2 Resistor Differential NL 2 Resistor Nonlinearity 3 Nominal Resistance Resistance Tempco Wiper Resistance Nominal Resistance Match DC CHARACTERISTICS POTENTIOMETER DIVIDER Specifications Apply to All ...

Page 5

SPECIFICATIONS ( ELECTRICAL CHARACTERISTICS–ALL VERSIONS Parameter 2, 3 SWITCHING CHARACTERISTICS Input Clock Pulsewidth Data Setup Time Data Hold Time 4 CLK to SDO Propagation Delay CS Setup Time CS High Pulsewidth Reset Pulsewidth CLK Fall to ...

Page 6

AD8400/AD8402/AD8403 ABSOLUTE MAXIMUM RATINGS (T = 25°C, unless otherwise noted GND . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 7

... AD8403AN100 4 AD8403AR100 4 AD8403ARU100 4 AD8403ARU100-REEL 4 AD8400AN1 1 AD8400AR1 1 AD8402AN1 2 AD8402AR1 2 AD8402ARU1 2 AD8402ARU1-REEL 2 AD8403AN1 4 AD8403AR1 4 AD8403ARU1 4 AD8403ARU1-REEL Plastic DIP Small Outline Thin Shrink SO. The AD8400, AD8402, and AD8403 contain 720 transistors. ORDERING GUIDE End-to-End Temperature Package Range ( C) Description AB 10 –40 to +125 ...

Page 8

AD8400/AD8402/AD8403 PIN CONFIGURATIONS AD8400 2 GND 7 TOP VIEW CS (Not to Scale SDI AGND AD8402 TOP VIEW (Not to Scale) 5 ...

Page 9

Typical Performance Characteristics–AD8400/AD8402/AD8403 10k 128 160 192 224 256 CODE – Decimal 1205 UNITS ...

Page 10

AD8400/AD8402/AD8403 700 600 T = –40 C/+ CONNECT A 500 R MEASURED WB 400 300 200 100 0 –100 128 160 192 224 256 CODE – Decimal ...

Page 11

SEE TEST CIRCUIT 7 CODE = 10k R = 50k R = 100k 10 100 1k 10k 100k 1M FREQUENCY – 700kHz, ...

Page 12

AD8400/AD8402/AD8403 TEST CIRCUITS DUT 1LSB = V+/256 CONNECT DUT DUT 1V/R W NOMINAL ...

Page 13

OPERATION The AD8400/AD8402/AD8403 provide a single, dual, and quad channel, 256-position digitally controlled variable resistor (VR) device. Changing the programmed VR settings is accomplished by clocking in a 10-bit serial data word into the SDI (Serial Data Input) pin. The ...

Page 14

AD8400/AD8402/AD8403 where Dx is the data contained in the 8-bit RDAC# latch, and R is the nominal end-to-end resistance. For example, when and B terminal is open circuit, the following output A resistance values will ...

Page 15

Table II. Input Logic Control Truth Table CLK CS RS SHDN Register Activity effect, enables SDO pin Shift one bit in from the SDI pin. The tenth previously entered bit ...

Page 16

... The ac characteristics of the RDACs are dominated by the internal parasitic capacitances and the external capacitive loads. The –3 dB bandwidth of the AD8403AN10 (10 kΩ resistor) measures 600 kHz at half scale as a potentiometer divider. TPC 22 provides the large signal BODE plot characteristics of the three available resistor versions 10 kΩ ...

Page 17

... The filter gain response at the band-pass output is shown in Figure 12 center frequency of 2 kHz, the gain is adjusted over a – +20 dB range determined by RDAC1. Circuit Q is adjusted by RDAC4. For more detailed reading on the state variable active filter, see Analog Devices’ application note, AN-318. 10k RDAC4 ...

Page 18

AD8400/AD8402/AD8403 0.210 (5.33) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Lead Plastic DIP (N-8) 0.430 (10.92) 0.348 (8.84 0.280 (7.11) 0.240 (6.10 0.325 (8.25) PIN 1 0.100 (2.54) 0.300 (7.62) BSC 0.060 (1.52) 0.210 0.015 ...

Page 19

Narrow Body SOIC Package (SO-14) 0.3444 (8.75) 0.3367 (8.55 0.1574 (4.00) 0.2440 (6.20) 0.1497 (3.80) 0.2284 (5.80 PIN 1 0.0688 (1.75) 0.050 (1.27) 0.0532 (1.35) BSC 0.0098 (0.25) 0.0192 (0.49) SEATING 0.0099 (0.25) PLANE 0.0040 ...

Page 20

AD8400/AD8402/AD8403 PIN 1 0.0118 (0.30) 0.0040 (0.10) PIN 1 0.006 (0.15) 0.002 (0.05) SEATING Revision History Location Data Sheet changed from REV REV. C. Addition of new Figure ...

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