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PDF DS4422 Datasheet ( Hoja de datos )

Número de pieza DS4422
Descripción (DS4422 / DS4424) 7-Bit Sink/Source Current DAC
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo

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DS4422 Hoja de datos, Descripción, Manual
Rev 0; 3/08
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.
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Applications
Power-Supply Adjustment
Power-Supply Margining
Adjustable Current Sink or Source
Ordering Information
PART
OUTPUTS TEMP RANGE
DS4422N+
2 -40°C to +85°C
DS4422N+T&R
2 -40°C to +85°C
DS4424N+
4 -40°C to +85°C
DS4424N+T&R
4 -40°C to +85°C
+Denotes a lead-free package.
T&R = Tape and reel.
PIN-
PACKAGE
14 TDFN
14 TDFN
14 TDFN
14 TDFN
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
RPU RPU
VCC
SDA
SCL
A1 DS4422/ OUT0
A0 DS4424 OUT1
GND
FS0
RFS0
FS1
RFS1
VCC VOUT0
OUT
DC-DC
CONVERTER
FB
R0A
R0B
VOUT1
OUT
DC-DC
CONVERTER
FB
R1A
R1B
_______________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

1 page

DS4422 pdf
Two-/Four-Channel, I2C, 7-Bit Sink/Source
Current DAC
PIN
DS4424 DS4422
11
22
33
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5—
66
77
88
10 10
12 —
14 —
9, 11
9, 11
13 13
4, 5, 12,
14
——
Pin Description
NAME
FUNCTION
SDA
SCL
GND
FS3
FS2
FS1
FS0
OUT0
OUT1
OUT2
OUT3
A0, A1
VCC
I2C Serial Data. Input/output for I2C data.
I2C Serial Clock. Input for I2C clock.
Ground
Full-Scale Calibration Input. A resistor to ground on these pins determines the full-scale
current for each output. FS0 controls OUT0, FS1 controls OUT1, etc. (The DS4422 has only
two inputs: FS0 and FS1.)
Current Output. Sinks or sources the current determined by the I2C interface and the
resistance connected to FSx. (The DS4422 has only two outputs: OUT0 and OUT1.)
Address Select Inputs. Determines the I2C slave address by connecting VCC or GND.
See the Detailed Description section for the available device addresses.
Power Supply
N.C. No Connection
EP Exposed Pad. Leave floating or connect to GND.
SDA SCL A1 A0
VCC
VCC
F8h
SOURCE OR
SINK MODE
GND
CURRENT
DAC0
I2C-COMPATIBLE
SERIAL INTERFACE
F9h
127 POSITIONS
EACH FOR SINK
AND SOURCE
MODE
CURRENT
DAC1
Block Diagram
FAh
CURRENT
DAC2
DS4422/DS4424
FBh
CURRENT
DAC3
FS0
RFS0
OUT0
FS1
RFS1
OUT1
FS2
RFS2
FS3
OUT2
RFS3
OUT3
DS4424 ONLY
_______________________________________________________________________________________ 5

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