DS4432 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
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DS4432 Datasheet PDF : 9 Pages
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Dual-Channel, I2C, 7-Bit Sink/Source
Current DAC
IOUT0 is chosen to be 100µA (midrange source/sink
current for the DS4432). Summing the currents into the
feedback node, we have the following:
IOUT0 = IR0B − IR0A
where
and
IR0B
=
VFB
R 0B
IR0A
=
VOUT − VFB
R0A
To create a 20% margin in the supply voltage, the value
of VOUT is set to 2.4V. With these values in place, R0B
is calculated to be 2.67kΩ, and R0A is calculated to be
4kΩ. The current DAC in this configuration allows the
output voltage to be moved linearly from 1.6V to 2.4V
using 127 settings. This corresponds to a resolution of
6.3mV/step.
VCC Decoupling
To achieve the best results when using the DS4432,
decouple the power supply with a 0.01µF or 0.1µF
capacitor. Use a high-quality ceramic surface-mount
capacitor if possible. Surface-mount components mini-
mize lead inductance, which improves performance,
and ceramic capacitors tend to have adequate high-
frequency response for decoupling applications.
4.7kΩ
4.7kΩ
SDA
SCL
GND
VCC
DS4432
OUT0
FS0
RFS0 = 80kΩ
VCC
VOUT = 2.0V*
OUT
DC-DC
CONVERTER
IR0A
FB
IR0B
R0A = 4kΩ
VFB = 0.8V*
R0B = 2.67kΩ
IOUT0
*VOUT AND VFB VALUES ARE DETERMINED BY THE DC-DC CONVERTER AND SHOULD NOT BE CONFUSED WITH VOUT AND VRFS OF THE DS4432.
Figure 3. Example Application Circuit
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PACKAGE TYPE
8 µSOP
PACKAGE CODE
U8+1
DOCUMENT NO.
21-0036
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9
© 2008 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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