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AD5254

Features: *AD5253: Quad 64-position resolution *AD5254: Quad 256-position resolution*1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ *Nonvolatile memory1 stores wiper settings with write protection *Power-on refreshed to EEMEM settings in 300 µs typ *EEMEM rewrite time = 540 µs typ ...

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SeekIC No. : 004268968 Detail

AD5254: Features: *AD5253: Quad 64-position resolution *AD5254: Quad 256-position resolution*1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ *Nonvolatile memory1 stores wiper settings with write protecti...

AD5254 Data Sheet

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Part Number:
AD5254
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

*AD5253: Quad 64-position resolution
*AD5254: Quad 256-position resolution
*1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
*Nonvolatile memory1 stores wiper settings with write protection
*Power-on refreshed to EEMEM settings in 300 µs typ
*EEMEM rewrite time = 540 µs typ
*Resistance tolerance stored in nonvolatile memory
*12 extra bytes in EEMEM for user-defined information
*I2C® compatible serial interface
*Direct read/write accesses of RDAC2 and EEMEM registers
*Predefined linear increment/decrement commands
*Predefined ±6 dB step change commands
*Synchronous or asynchronous quad channel update
*Wiper setting readback
*4 MHz bandwidth-1 kΩ version
*Single supply 2.7 V to 5.5 V
*Dual supply ±2.25 V to ±2.75 V
*2 slave address decoding bits allow operation of 4 devices
*100-year typical data retention, TA = 55°C
*Operating temperature: 40°C to +85°C





Application

Mechanical potentiometer replacement
Low resolution DAC replacement
RGB LED backlight control
White LED brightness adjustment
RF base station power amp bias control
Programmable gain and offset control
Programmable attenuators
Programmable voltage-to-current conversion
Programmable power supply
Programmable filters
Sensor calibrations




Pinout

Connection Diagram

AD5254 Diagram




Specifications

Parameter Rating
VDD to GND
VSS to GND
VDD to VSS
VA, VB, VW to GND 		−0.3 V, +7 V
+0.3 V, −7 V
7 V
VSS, VDD
Maximum Current
IWB, IWA Pulsed
IWB Continuous (RWB 1 kΩ, A Open)1
IWA Continuous (RWA 1 kΩ, B Open)1
IAB Continuous (RAB = 1 kΩ/10 kΩ/50 kΩ/100 kΩ)1		 ±20 mA
±5 mA
±5 mA
±5 mA/±500 µA/±100 µA/±50 µA
Digital Inputs and Output Voltage to GND
Operating Temperature Range
Maximum Junction Temperature (TJ MAX)
Storage Temperature
Lead Temperature (Soldering, 10 sec)
Vapor Phase (60 sec)
Infrared (15 sec)
TSSOP-20 Thermal Resistance2JA		 0 V, 7 V
−40°C to +85°C
150°C
−65°C to +150°C
300°C
215°C
220°C
143°C/W


# Channels 4
# Positions 256
Memory Type Non-Volatile
Interface I2C
Resistor Values (kOhms) 1, 10, 50, 100
Bipolar Voltage Range (V) ±3V
Voltage Range (V) +5.5V
Supply Current 3A
Temp. Range -40 °C to.. 85Deg
Absolute Tempco (ppm/°C) 300ppm/C
Package TSSOP





Description

The AD5253/AD5254 allow the host I2C controllers to write any of the 64-/256-step wiper settings in the RDAC registers and store them in the EEMEM. Once the settings are stored, they are restored automatically to the RDAC registers at system power on; the settings can also be restored dynamically.

The AD5253/AD5254 provide additional increment, decrement, +6 dB step change, and 6 dB step change in synchronous or asynchronous channel update modes. The increment and decrement functions allow stepwise linear adjustments, while ±6 dB step changes are equivalent to doubling or halving the RDAC wiper setting. These functions are useful for steep-slope nonlinear adjustment applications such as white LED brightness and audio volume control.

The AD5253/AD5254 have a patented resistance tolerance storing function that allows the user to access the EEMEM and obtain the absolute end-to-end resistance values of the RDACs for precision applications.

The AD5253/AD5254 are available in TSSOP-20 packages in1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ options. All parts are guaranteed to operate over the 40°C to +85°C extended industrial temperature range.






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