X9421 datasheet(3/20 Pages) RENESAS

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X9421

FN8196 Rev.1.00

Page 3 of 20

January 14, 2009

Detailed Functional Diagrams

Circuit Level Applications

• Vary the Gain of a Voltage Amplifier

• Provide Programmable DC Reference Voltages for

Comparators and Detectors

• Control the Volume in Audio Circuits

• Trim Out the Offset Voltage Error in a Voltage Amplifier

Circuit

• Set the Output Voltage of a Voltage Regulator

• Trim the Resistance in Wheatstone Bridge Circuits

• Control the Gain, Characteristic Frequency and

Q-factor in Filter Circuits

• Set the Scale Factor and Zero Point in Sensor Signal

Conditioning Circuits

• Vary the Frequency and Duty Cycle of Timer ICs

• Vary the DC Biasing of a Pin Diode Attenuator in RF Circuits

• Provide a Control Variable (I, V, or R) in Feedback Circuits

System Level Applications

• Adjust the contrast in LCD displays

• Control the Power Level of LED Transmitters in

Communication Systems

• Set and Regulate the DC Biasing Point in an RF Power

Amplifier in Wireless Systems

• Control the Gain in Audio and Home Entertainment Systems

• Provide the Variable DC Bias for Tuners in RF Wireless

Systems

• Set the Operating Points in Temperature Control Systems

• Control the Operating Point for Sensors in Industrial

Systems

• Trim Offset and Gain Errors in Artificial Intelligent Systems

WIPER

COUNTER

(WCR)

RH/VH

RL/VL

DATA

RW/VW

INTERFACE

AND

CONTROL

CIRCUITRY

VCC

VSS

SCK

HOLD

CONTROL

64-taps

10k



POWER-ON RECALL

DR0 DR1

DR2 DR3

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