EVAL-AD5262EBZ

Manufacturer Part NumberEVAL-AD5262EBZ
DescriptionEVALUATION BOARD
ManufacturerAnalog Devices Inc
EVAL-AD5262EBZ datasheet
 


Specifications of EVAL-AD5262EBZ

Main PurposeDigital PotentiometerUtilized Ic / PartAD5262
Primary AttributesDual Channel, 256 PositionsSecondary AttributesSPI Interface
Lead Free Status / RoHS StatusLead free / RoHS CompliantEmbedded-
1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Page 1/24

Download datasheet (604Kb)Embed
Next
FEATURES
256 positions
AD5260: 1 channel
AD5262: 2 channels (independently programmable)
Potentiometer replacement
20 kΩ, 50 kΩ, 200 kΩ
Low temperature coefficient: 35 ppm/°C
4-wire, SPI-compatible serial data input
5 V to 15 V single-supply; ±5.5 V dual-supply operation
Power on midscale preset
APPLICATIONS
Mechanical potentiometer replacement
Instrumentation: gain, offset adjustment
Stereo channel audio level control
Programmable voltage-to-current conversion
Programmable filters, delays, time constants
Line impedance matching
Low resolution DAC replacement
GENERAL DESCRIPTION
The AD5260/AD5262 provide a single- or dual-channel, 256-
position, digitally controlled variable resistor (VR) device.
These devices perform the same electronic adjustment function
as a potentiometer or variable resistor. Each channel of the
AD5260/AD5262 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 20 Ω, 50 Ω, or 200 Ω has a
nominal temperature coefficient of 35 ppm/°C. Unlike the
majority of the digital potentiometers in the market, these
devices can operate up to 15 V or ±5 V provided proper supply
voltages are furnished.
Each VR has its own VR latch that 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. The AD5260 contains an
8-bit serial register whereas the AD5262 contains a 9-bit serial
register. Each bit is clocked into the register on the positive
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 that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
1-/2-Channel 15 V Digital Potentiometer
FUNCTIONAL BLOCK DIAGRAMS
SHDN
V
DD
V
SS
V
L
CS
LOGIC
CLK
SDI
GND
SHDN
V
DD
V
SS
V
L
1
CS
LOGIC
CLK
SDI
GND
edge of the CLK pin. The AD5262 address bit determines the
corresponding VR latch to be loaded with the last eight bits of
the data word during the positive edging of CS strobe. A serial
data output pin at the opposite end of the serial register enables
simple daisy-chaining in multiple VR applications without
additional external decoding logic. An optional reset pin ( PR )
forces the wiper to the midscale position by loading 0x80 into
the VR latch.
The AD5260/AD5262 are available in thin surface-mount
14-lead TSSOP and 16-lead TSSOP packages. All parts are
guaranteed to operate over the extended industrial temperature
range of −40°C to +85°C.
1
The terms digital potentiometers, VR, and RDAC are used interchangeably.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
AD5260/AD5262
A
W
B
AD5260
RDAC
REGISTER
POWER-ON
PR
RESET
8
SDO
SERIAL INPUT REGISTER
Figure 1. AD5260
A1
W1 B1
A2
W2 B2
RDAC1
RDAC2
REGISTER
REGISTER
POWER-ON
PR
RESET
8
SDO
SERIAL INPUT REGISTER
AD5262
Figure 2. AD5262
www.analog.com
©2002–2010 Analog Devices, Inc. All rights reserved.

EVAL-AD5262EBZ Summary of contents

  • Page 1

    FEATURES 256 positions AD5260: 1 channel AD5262: 2 channels (independently programmable) Potentiometer replacement 20 kΩ, 50 kΩ, 200 kΩ Low temperature coefficient: 35 ppm/°C 4-wire, SPI-compatible serial data input single-supply; ±5.5 V dual-supply operation Power ...

  • Page 2

    AD5260/AD5262 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagrams............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Electrical Characteristics—20 kΩ, 50 kΩ, 200 kΩ Versions .. 3 Timing Diagrams.......................................................................... 5 Absolute Maximum Ratings............................................................ 6 ...

  • Page 3

    SPECIFICATIONS ELECTRICAL CHARACTERISTICS—20 kΩ, 50 kΩ, 200 kΩ VERSIONS The AD5260/AD5262 contain 1968 transistors. Die size: 89 mil × 105 mil (9345 sq ...

  • Page 4

    AD5260/AD5262 Parameter 6, 10 DYNAMIC CHARACTERISTICS Bandwidth –3 dB Total Harmonic Distortion V Settling Time W 11 Crosstalk Analog Crosstalk Resistor Noise Voltage 6, 12 INTERFACE TIMING CHARACTERISTICS Clock Frequency Input Clock Pulse Width Data Setup Time Data Hold Time ...

  • Page 5

    TIMING DIAGRAMS Table 2. AD5260 8-Bit Serial Data Word Format B7 (MSB Table 3. AD5262 9-Bit Serial Data Word Format ADDR B8 B7 (MSB SDI CLK CS ...

  • Page 6

    AD5260/AD5262 ABSOLUTE MAXIMUM RATINGS T =25°C, unless otherwise noted. A Table 4. Parameter V to GND GND GND GND ...

  • Page 7

    PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS Table 5. AD5260 Pin Function Descriptions Pin No. Mnemonic Description Terminal Wiper Terminal Terminal Positive Power Supply. Specified for operation at both ...

  • Page 8

    AD5260/AD5262 Table 6. AD5262 Pin Function Descriptions Pin No. Mnemonic Description 1 SDO Serial Data Output. Open-drain transistor requires a pull-up resistor Terminal RDAC Wiper RDAC 1, Address ...

  • Page 9

    TYPICAL PERFORMANCE CHARACTERISTICS 0.8 0.7 0.6 0.5 0.4 0.3 0.2 +12V ±5V 0.1 0 –0.1 –0 128 160 CODE (Decimal) Figure 9. R-INL vs. Code vs. Supply Voltages 0.10 0.05 0 –0.05 –0.10 –0.15 +5V ±5V ...

  • Page 10

    AD5260/AD5262 1.0 AVG + 3σ 0.5 AVG AVG – 3σ 0 –0.5 –1 – ( Figure 15. INL vs. Supply Voltages 2.0 1.5 AVG + 3σ 1.0 AVG 0.5 AVG – 3σ ...

  • Page 11

    +15/ 26.5 26 ± 25.5 25.0 24.5 –40 – TEMPERATURE (°C) Figure 21. I vs. Temperature LOGIC 1000 5V/ ...

  • Page 12

    AD5260/AD5262 25°C CODE = 0xFF A 0 0x80 –6 0x40 –12 0x20 –18 0x10 –24 0x08 –30 0x04 –36 0x02 –42 0x01 –48 –54 1k 10k FREQUENCY (Hz) Figure 27. Gain vs. Frequency vs. Code ...

  • Page 13

    Figure 33. Large Signal Settling Time 10mV/DIV 40ns/DIV Figure 34. Digital Feedthrough vs. Time 100 OPEN 25° 20kΩ 50kΩ AB 0.1 ...

  • Page 14

    AD5260/AD5262 TEST CIRCUITS Figure 38 to Figure 46 define the test conditions used in Table DUT DD 1LSB = V+/ Figure 38. Potentiometer Divider Nonlinearity Error (INL, DNL ...

  • Page 15

    ... Stand- ard logic families work well. If mechanical switches are used for product evaluation, they should be debounced by a flip-flop or other suitable means. Figure 47 shows more detail of the inter- nal digital circuitry. When CS is low, the clock loads data into the serial input register on each positive clock edge (see Table 8 ...

  • Page 16

    AD5260/AD5262 AD5260/AD5262 CS ADDR DECODE CLK SERIAL REGISTER SDI Figure 48. Equivalent Input Control Logic The target RDAC latch is loaded with the last eight bits of the serial data word completing one RDAC update. For the AD5262, two separate ...

  • Page 17

    B terminal contact. The 8-bit data in the RDAC latch is decoded to select one of the 256 possible settings. Assuming a 20 kΩ part is used, the wiper’s first connection starts at ...

  • Page 18

    AD5260/AD5262 LAYOUT AND POWER SUPPLY BYPASSING It is good practice to employ a compact, minimum lead length layout design. The leads to the input should be as direct as possible with a minimum conductor length. Ground paths should have low ...

  • Page 19

    APPLICATIONS INFORMATION BIPOLAR OPERATION FROM DUAL SUPPLIES The AD5260/AD5262 can be operated from dual supplies enabling control of ground referenced ac signals or bipolar operation. The ac signal, as high directly across Terminal A ...

  • Page 20

    AD5260/AD5262 BIPOLAR PROGRAMMABLE GAIN AMPLIFIER For applications that require bipolar gain, Figure 62 shows one implementation. Digital Potentiometer U1 sets the adjustment range. The wiper voltage at W2 can therefore be programmed between V and − given U2 ...

  • Page 21

    REF191 (2.048V + V ) SLEEP L 6 OUTPUT AD5260 GND 1µ +5V U2 OP1177 –2.048 –5V Figure 64. Programmable 4-to-20 mA Current Source ...

  • Page 22

    AD5260/AD5262 ate state occurs that may not be acceptable for certain applications result, different devices can also be used in daisy-chaine mode so that par ts can be programmed to the same setting simultaneously. FREQUENCY ADJUSTMENT C' 2.2nF ...

  • Page 23

    OUTLINE DIMENSIONS 4.50 4.40 4.30 PIN 1 1.05 1.00 0.80 0.15 0.05 COPLANARITY 0.10 0.15 0.05 5.10 5.00 4. 6.40 BSC 1 7 0.65 BSC 1.20 0.20 MAX 0.09 8° SEATING 0° 0.30 PLANE 0.19 COMPLIANT TO JEDEC ...

  • Page 24

    ... AD5262BRUZ50 50 AD5262BRUZ50-RL7 50 AD5262BRUZ200 200 AD5262BRUZ200-RL7 200 EVAL-AD5262EBZ RoHS Compliant Part. ©2002–2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Temperature Package Description −40°C to +85°C 14-Lead TSSOP −40°C to +85°C 14-Lead TSSOP − ...