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ADN2850ACP250-RL7 Datasheet(PDF) 1 Page - Analog Devices |
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ADN2850ACP250-RL7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page REV. B 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. 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., 2002 ADN2850* Nonvolatile Memory, Dual 1024-Position Programmable Resistors FUNCTIONAL BLOCK DIAGRAM ADDR DECODE ADN2850 RDAC1 SERIAL INTERFACE CS CLK SDI SDO PR WP RDY VDD VSS GND RDAC1 REGISTER EEMEM1 RDAC2 REGISTER EEMEM2 26 BYTES USER EEMEM PWR ON PRESET EEMEM CONTROL W1 B1 RDAC2 W2 B2 CURRENT MONITOR I1 I2 V1 V2 CODE – Decimal 100 75 0 0 1023 256 512 768 50 25 Figure 1. RWB(D) vs. Decimal Code FEATURES Dual, 1024-Position Resolution 25 k , 250 k Full-Scale Resistance Low Temperature Coefficient: 35 ppm/ C Nonvolatile Memory1 Preset Maintains Wiper Settings Permanent Memory Write-Protection Wiper Settings Read Back Actual Tolerance Stored in EEMEM1 Linear Increment/Decrement Log Taper Increment/Decrement SPI Compatible Serial Interface 3 V to 5 V Single Supply or 2.5 V Dual Supply 26 Bytes User Nonvolatile Memory for Constant Storage Current Monitoring Configurable Function 100-Year Typical Data Retention TA = 55 C APPLICATIONS SONET, SDH, ATM, Gigabit Ethernet, DWDM Laser Diode Driver Optical Supervisory Systems GENERAL DESCRIPTION The ADN2850 provides dual-channel, digitally controlled program- mable resistors 2 with resolution of 1024 positions. These devices perform the same electronic adjustment function as a mechanical rheostat with enhanced resolution, solid-state reliability, and superior low temperature coefficient performance. The ADN2850’s versatile programming via a standard serial interface allows 16 modes of operation and adjustment, including scratch pad pro- gramming, memory storing and retrieving, increment/decrement, log taper adjustment, wiper setting readback, and extra user defined EEMEM 1. Another key feature of the ADN2850 is that the actual tolerance is stored in the EEMEM. The actual full-scale resistance can therefore be known, which is valuable for tolerance matching and calibration. In the scratch pad programming mode, a specific setting can be programmed directly to the RDAC 2 register, which sets the resis- tance between terminals W and B. The RDAC register can also be loaded with a value previously stored in the EEMEM register. The value in the EEMEM can be changed or protected. When changes are made to the RDAC register, the value of the new setting can be saved into the EEMEM. Thereafter, such value will be transferred automatically to the RDAC register during system power ON, which is enabled by the internal preset strobe. EEMEM can also be retrieved through direct programming and external preset pin control. The linear step increment and decrement commands enable the setting in the RDAC register to be moved UP or DOWN, one step at a time. For logarithmic changes in wiper setting, a left/right bit shift command adjusts the level in ±6 dB steps. The ADN2850 is available in the 5 mm 5 mm 16-lead frame chip scale LFCSP and thin 16-lead TSSOP packages. All parts are guaranteed to operate over the extended industrial temperature range of –40 °C to +85°C. *Patent pending NOTES 1The term nonvolatile memory and EEMEM are used interchangeably. 2The term programmable resistor and RDAC are used interchangeably. |
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