Transcription of Single Channel, 128-/256-Position, I2C/SPI, …
1 Single Channel, 128-/256-Position, I2C/SPI, nonvolatile digital potentiometer data sheet AD5121/AD5141 Rev. C Document Feedback 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. One Technology Way, Box 9106, Norwood, MA 02062-9106, Tel: 2012 2017 analog devices , Inc.
2 All rights reserved. Technical Support FEATURES 10 k and 100 k resistance options Resistor tolerance: 8% maximum Wiper current: 6 mA Low temperature coefficient: 35 ppm/ C Wide bandwidth: 3 MHz Fast start-up time < 75 s Linear gain setting mode Single - and dual-supply operation Independent logic supply: V to V Wide operating temperature: 40 C to +125 C 3 mm 3 mm LFCSP Qualified for automotive applications APPLICATIONS Portable electronics level adjustment LCD panel brightness and contrast controls Programmable filters, delays, and time constants Programmable power supplies FUNCTIONAL BLOCK DIAGRAM VDDINDEPVSSGNDWPVLOGIC7/8 SERIALINTERFACEPOWER-ONRESETRDACINPUTREG ISTEREEPROMMEMORYAWBAD5121/AD5141 SYNC/ADDR0 SCLK/SCLSDI/SDASDO/ADDR1 DISRESET10940-001 Figure 1.
3 GENERAL DESCRIPTION The AD5121/AD5141 potentiometers provide a nonvolatile solution for 128-/256-position adjustment applications, offering guaranteed low resistor tolerance errors of 8% and up to 6 mA current density in the A, B, and W pins. The low resistor tolerance and low nominal temperature coefficient simplify open-loop applications as well as applications requiring tolerance matching. The linear gain setting mode allows independent programming of the resistance between the digital potentiometer terminals, through RAW and RWB string resistors, allowing very accurate resistor matching. The high bandwidth and low total harmonic distortion (THD) ensure optimal performance for ac signals, making it suitable for filter design.
4 The low wiper resistance of only 40 at the ends of the resistor array allows for pin-to-pin connection. The wiper values can be set through an SPI-/I2C-compatible digital interface that is also used to read back the wiper register and EEPROM contents. The AD5121/AD5141 are available in a compact, 16-lead, 3 mm 3 mm LFCSP. The devices are guaranteed to operate over the extended industrial temperature range of 40 C to +125 C. Table 1. Family Models Model Channel Position Interface Package AD51231 Quad 128 I2C LFCSP AD5124 Quad 128 SPI/I2C LFCSP AD5124 Quad 128 SPI TSSOP AD51431 Quad 256 I2C LFCSP AD5144 Quad 256 SPI/I2C LFCSP AD5144 Quad 256 SPI TSSOP AD5144A Quad 256 I2C TSSOP AD5122 Dual 128 SPI LFCSP/TSSOP AD5122A Dual 128 I2C LFCSP/TSSOP AD5142 Dual 256 SPI LFCSP/TSSOP AD5142A Dual 256 I2C LFCSP/TSSOP AD5121 Single 128 SPI/I2C LFCSP AD5141 Single 256 SPI/I2C LFCSP 1 Two potentiometers and two rheostats.
5 AD5121/AD5141 data sheet Rev. C | Page 2 of 32 TABLE OF CONTENTS Features .. 1 Applications .. 1 Functional Block Diagram .. 1 General Description .. 1 Revision History .. 2 Specifications .. 3 Electrical Characteristics AD5121 .. 3 Electrical Characteristics AD5141 .. 6 Interface Timing Specifications .. 9 Shift Register and Timing Diagrams .. 10 Absolute Maximum Ratings .. 12 Thermal Resistance .. 12 ESD Caution .. 12 Pin Configuration and Function Descriptions .. 13 Typical Performance Characteristics .. 14 Test Circuits .. 19 Theory of Operation .. 20 RDAC Register and EEPROM .. 20 Input Shift 20 Serial data digital Interface Selection, DIS.
6 20 SPI Serial data Interface .. 20 I2C Serial data Interface .. 22 I2C Address .. 22 Advanced Control Modes .. 23 EEPROM or RDAC Register Protection .. 24 Load RDAC Input Register (LRDAC) .. 24 INDEP Pin .. 24 RDAC Architecture .. 27 Programming the Variable Resistor .. 27 Programming the potentiometer Divider .. 28 Terminal Voltage Operating Range .. 29 Power-Up Sequence .. 29 Layout and Power Supply Biasing .. 29 Outline Dimensions .. 30 Ordering Guide .. 30 Automotive Products .. 30 REVISION HISTORY 5/2017 Rev. B to Rev. C Changes to Figure 7 and Table 9 .. 13 Changes to Figure 16 and Figure 17 .. 15 Updated Outline Dimensions .. 30 Changes to Ordering Guide.
7 30 Change to Automotive Products Section .. 30 3/2016 Rev. A to Rev. B Changes to Features 1 Changes to Logic Supply Current Parameter, Table 2 .. 4 Added Note 12, Ta b l e 2 .. 5 Changes to Logic Supply Current Parameter, Table 3 .. 7 Added Note 12, Ta b l e 3 .. 8 Changes to Figure 7 .. 13 Changes to Figure 16 .. 15 Added Figure 17; Renumbered Sequentially .. 15 Changes to Figure 20 .. 16 Change to Linear Gain Setting Mode Section .. 23 Changes to RDAC Architecture Section .. 27 Changes to Ordering Guide .. 30 Added Automotive Products Section .. 30 12/2012 Rev. 0 to Rev. A Changes to Table 10 .. 22 10/2012 Revision 0: Initial Version data sheet AD5121/AD5141 Rev.
8 C | Page 3 of 32 SPECIFICATIONS ELECTRICAL CHARACTERISTICS AD5121 VDD = V to V, VSS = 0 V; VDD = V to V, VSS = V to V; VLOGIC = V to V, 40 C < TA < +125 C, unless otherwise noted. Table 2. Parameter Symbol Test Conditions/Comments Min Typ1 Max Unit DC CHARACTERISTICS RHEOSTAT MODE (ALL RDACs) Resolution N 7 Bits Resistor Integral Nonlinearity2 R-INL RAB = 10 k VDD V 1 +1 LSB VDD < V 1 + LSB RAB = 100 k VDD V + LSB VDD < V 1 +1 LSB Resistor Differential Nonlinearity2 R-DNL + LSB Nominal Resistor Tolerance RAB/RAB 8 1 +8 % Resistance Temperature Coefficient3 ( RAB/RAB)
9 / T 106 Code = full scale 35 ppm/ C Wiper Resistance3 RW Code = zero scale RAB = 10 k 55 125 RAB = 100 k 130 400 Bottom Scale or Top Scale RBS or RTS RAB = 10 k 40 80 RAB = 100 k 60 230 DC CHARACTERISTICS potentiometer DIVIDER MODE (ALL RDACs) Integral Nonlinearity4 INL RAB = 10 k + LSB RAB = 100 k + LSB Differential Nonlinearity4 DNL + LSB Full-Scale Error VWFSE RAB = 10 k LSB RAB = 100 k + LSB Zero-Scale Error VWZSE RAB = 10 k 1 LSB RAB = 100 k LSB Voltage Divider Temperature Coefficient3 ( VW/VW)/ T 106 Code = half scale 5 ppm/ C AD5121/AD5141 data sheet Rev.
10 C | Page 4 of 32 Parameter Symbol Test Conditions/Comments Min Typ1 Max Unit RESISTOR TERMINALS Maximum Continuous Current IA, IB, and IW RAB = 10 k 6 +6 mA RAB = 100 k + mA Terminal Voltage Range5 VSS VDD V Capacitance A, Capacitance B3 CA, CB f = 1 MHz, measured to GND, code = half scale RAB = 10 k 25 pF RAB = 100 k 12 pF Capacitance W3 CW f = 1 MHz, measured to GND, code = half scale RAB = 10 k 12 pF RAB = 100 k 5 pF Common-Mode Leakage Current3 VA = VW = VB 500 15 +500 nA digital INPUTS Input Logic3 High VINH VLOGIC = V to V VLOGIC V VLOGIC = V to V VLOGIC V Low VINL VLOGIC V Input Hysteresis3 VHYST VLOGIC V Input Current3 IIN 1 A Input Capacitance3 CIN 5 pF digital OUTPUTS Output High Voltage3 VOH RPULL-UP = k to VLO G IC VLOGIC V Output Low Voltage3 VOL ISINK = 3 mA V ISINK = 6 mA.
