DS4422_09 Datasheet, PDF (1/11 Pages) Maxim Integrated Products – Two-/Four-Channel, I2C, 7-Bit Sink/Source Current DAC

19-4744; Rev 1; 7/09
Two-/Four-Channel, I²C, 7-Bit Sink/Source
Current DAC
General Description
The DS4422 and DS4424 contain two or four I²C pro-
grammable current DACs that are each capable of
sinking and sourcing current up to 200µA. Each DAC
output has 127 sink and 127 source settings that are
programmed using the I²C interface. The current DAC
outputs power up in a high-impedance state.
Applications
Power-Supply Adjustment
Power-Supply Margining
Adjustable Current Sink or Source
Ordering Information
PART
OUTPUTS TEMP RANGE
PIN-
PACKAGE
DS4422N+
2
-40°C to +85°C 14 TDFN-EP
DS4422N+T&R
2
-40°C to +85°C 14 TDFN-EP
DS4424N+
4
-40°C to +85°C 14 TDFN-EP
DS4424N+T&R
4
-40°C to +85°C 14 TDFN-EP
+Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
EP = Exposed pad.
Features
♦ Two (DS4422) or Four (DS4424) Current DACs
♦ Full-Scale Current 50µA to 200µA
♦ Full-Scale Range for Each DAC Determined by
External Resistors
♦ 127 Settings Each for Sink and Source Modes
♦ I²C-Compatible Serial Interface
♦ Two Address Pins Allow Four Devices on Same
I²C Bus
♦ Low Cost
♦ Small Package (14-Pin, 3mm x 3mm TDFN)
♦ -40°C to +85°C Temperature Range
♦ 2.7V to 5.5V Operating Range
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
R_PU
R_PU
V_CC
SDA
SCL
A1
DS4422/ OUT0
A0
DS4424 _OUT1
GND
FS0
R_FS0
FS1
R_FS1
V_CC
V_OUT0
OUT
DC-DC
CONVERTER
R_0A
FB
R_0B
V_OUT1
OUT
DC-DC
CONVERTER
R_1A
FB
R_1B
_______________________________________________________________ Maxim Integrated Products 1
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or visit Maxim’s website at www.maxim-ic.com.