BU2508FV,BU2507FV

Technical Note

3/8

www.rohm.com

2009.06 - Rev.A

© 2009 RzOHM Co., Ltd. All rights reserved.

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DAC Variable Output Range Function

With the variable output range function, the upper / lower limits of the output voltage as well as the power supply voltage can be set.

The upper limit value setting terminal VrefH is used as the power supply terminal, while the lower limit value setting terminal

VrefL is used as the GND terminal (1LSB ≒ 5mV). In the example below, VrefH = 3.5V / VrefL = 1.5V. Further adjustments

can be made in order to achieve greater accuracy (1LSB ≒ 2mV).

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Block Diagrams

BU2507FV

BU2508FV

Input Code

3FFh

VOUT

5V

0V

1024

ステップ

Input Code

3FFh

VOUT

5V

0V

1024

ステップ

3.5V

1.5V

VrefH

VrefL

1LSB≒5.0mV

1LSB≒2.0mV

step

step