Datasheet > ADN2850

ADN2850

更新时间： 2024-11-08 23:14:15

品牌	Logo	应用领域
亚德诺 - ADI		电阻器
页数	文件大小	规格书
20页	474K
描述
Nonvolatile Memory, Dual 1024 Position Programmable Resistors

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ADN2850 数据手册

Nonvolatile Memory, Dual

1024-Position Programmable Resistors

ADN2850^*

FUNCTIONAL BLOCK DIAGRAM

ADN2850

FEATURES

Dual, 1024-Position Resolution

25 kꢀ, 250 kꢀ Full-Scale Resistance

Low Temperature Coefficient: 35 ppm/ꢁC

ADDR

RDAC1

DECODE

Nonvolatile Memory¹Preset Maintains Wiper Settings

Permanent Memory Write-Protection

Wiper Settings Read Back

CLK

SDI

SERIAL

INTERFACE

RDAC1

SDO

EEMEM1

Actual Tolerance Stored in EEMEM¹

Linear Increment/Decrement

PWR ON

PRESET

RDAC2

Log Taper Increment/Decrement

SPI Compatible Serial Interface

3 V to 5 V Single Supply or ꢂ2.5 V Dual Supply

26 Bytes User Nonvolatile Memory for Constant Storage

Current Monitoring Configurable Function

100-Year Typical Data Retention T_A= 55ꢁC

EEMEM

CONTROL

RDY

RDAC2

EEMEM2

26 BYTES

USER EEMEM

CURRENT

MONITOR

GND

APPLICATIONS

SONET, SDH, ATM, Gigabit Ethernet, DWDM Laser

Diode Driver Optical Supervisory Systems

GENERAL DESCRIPTION

100

The ADN2850 provides dual-channel, digitally controlled program-

mable resistors²with 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 EEMEM¹.

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.

256

512

768

1023

CODE – Decimal

In the scratch pad programming mode, a specific setting can be

programmed directly to the RDAC²register, 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.

Figure 1. R_WB(D) vs. Decimal Code

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.

REV. B

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat

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

Fax: 781/326-8703

www.analog.com

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ADN2850ACP25	ADI	获取价格	Nonvolatile Memory, Dual 1024 Position Programmable Resistors
ADN2850ACP250	ADI	获取价格	Nonvolatile Memory, Dual 1024 Position Programmable Resistors
ADN2850ACP250-RL7	ADI	获取价格	Nonvolatile Memory, Dual 1024 Position Programmable Resistors
ADN2850ACP25-RL7	ADI	获取价格	Nonvolatile Memory, Dual 1024 Position Programmable Resistors
ADN2850ARU25	ADI	获取价格	Nonvolatile Memory, Dual 1024 Position Programmable Resistors
ADN2850ARU250-REEL7	ADI	获取价格	IC DUAL 250K DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 1024 POSITIONS, PDSO1
ADN2850ARU25-REEL7	ADI	获取价格	Nonvolatile Memory, Dual 1024 Position Programmable Resistors
ADN2850BCP25	ADI	获取价格	Nonvolatile Memory, Dual 1024 Position Programmable Resistors
ADN2850BCP250	ADI	获取价格	Nonvolatile Memory, Dual 1024 Position Programmable Resistors
ADN2850BCP250-RL7	ADI	获取价格	Nonvolatile Memory, Dual 1024 Position Programmable Resistors

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