DS4422N+ MAXIM [Maxim Integrated Products], DS4422N+ Datasheet

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DS4422N+

Manufacturer Part Number
DS4422N+
Description
Two-/Four-Channel, I2C, 7-Bit Sink/Source Current DAC
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
The DS4422 and DS4424 contain two or four I
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 I
outputs power up in a high-impedance state.
Rev 0; 3/08
+ Denotes a lead-free package.
T&R = Tape and reel.
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.
DS4422N+
DS4422N+T&R
DS4424N+
DS4424N+T&R
PART
Power-Supply Adjustment
Power-Supply Margining
Adjustable Current Sink or Source
R
PU
Two-/Four-Channel, I
OUTPUTS
_______________________________________________________________ Maxim Integrated Products
R
PU
2
2
4
4
Ordering Information
General Description
SDA
SCL
A1
A0
GND
2
C interface. The current DAC
R
FS0
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
FS0
DS4422/
DS4424
V
CC
Applications
FS1
R
OUT0
OUT1
FS1
PIN-
PACKAGE
14 TDFN
14 TDFN
14 TDFN
14 TDFN
2
C pro-
CONVERTER
DC-DC
V
CC
♦ Two (DS4422) or Four (DS4424) Current DACs
♦ Full-Scale Current 50µA to 200µA
♦ Full-Scale Range for Each DAC Determined by
♦ 127 Settings Each for Sink and Source Modes
♦ I
♦ Two Address Pins Allow Four Devices on Same
♦ 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.
External Resistors
I
2
2
C-Compatible Serial Interface
C Bus
2
OUT
FB
C, 7-Bit Sink/Source
V
OUT0
R
R
0A
0B
Typical Operating Circuit
CONVERTER
Current DAC
DC-DC
OUT
FB
V
OUT1
R
R
Features
1A
1B
1

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DS4422N+ Summary of contents

Page 1

... 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. ...

Page 2

Two-/Four-Channel, I Current DAC ABSOLUTE MAXIMUM RATINGS Voltage Range SDA, and SCL CC Relative to Ground.............................................-0.5V to +6.0V Voltage Range on A0, A1, FS0, FS1, FS2, FS3, OUT0, OUT1, OUT2, and OUT3 Relative to Ground ................-0.5V to ...

Page 3

Two-/Four-Channel, I OUTPUT CURRENT SOURCE CHARACTERISTICS (continued +2.7V to +5.5V -40°C to +85°C.) CC PARAMETER SYMBOL Output Current Variation Due to Power-Supply Change Output Current Variation Due to Output-Voltage Change Output Leakage Current at Zero ...

Page 4

Two-/Four-Channel, I Current DAC (T = +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. SUPPLY VOLTAGE 250 200 150 100 DOES NOT INCLUDE CURRENT DRAWN BY RESISTORS CONNECTED TO FS0, FS1, FS2, OR FS3 50 0 2.5 3.0 3.5 4.0 ...

Page 5

Two-/Four-Channel, I PIN NAME DS4424 DS4422 SDA SCL GND Ground 4 — FS3 Full-Scale Calibration Input. A resistor to ground on these pins determines the full-scale 5 — FS2 current ...

Page 6

Two-/Four-Channel, I Current DAC Detailed Description The DS4422/DS4424 contain two or four I current sources that are each capable of sinking and sourcing current. Each output (OUT0, OUT1, OUT2, and OUT3) has 127 sink and 127 source settings that can ...

Page 7

Two-/Four-Channel, I Example 80kΩ and register 0xF8h is written to FS0 a value of 0xAAh. Calculate the output current (0.976V/80kΩ) x (127/16) = 96.838µA FS The MSB of the output register the output ...

Page 8

Two-/Four-Channel, I Current DAC 2 TYPICAL I C WRITE TRANSACTION MSB LSB START R/W READ/ SLAVE WRITE ADDRESS* 2 EXAMPLE I C TRANSACTIONS (WHEN A0 AND A1 ARE GROUNDED) 20h A) SINGLE BYTE ...

Page 9

Two-/Four-Channel, I 4.7kΩ 4.7kΩ SDA SCL A1 A0 GND *V AND V VALUES ARE DETERMINED BY THE DC-DC CONVERTER AND SHOULD NOT BE CONFUSED WITH V OUT FB Figure 3. Example Application Circuit Applications Information Example Calculations for an Adjustable ...

Page 10

Two-/Four-Channel, I Current DAC Pin Configuration TOP VIEW 1 SDA SCL 2 3 GND FS3 (N.C.) 4 DS4422/ DS4424 FS2 (N.C.) 5 FS1 6 *EP FS0 INDICATES DS4422 ONLY. *EXPOSED PAD Maxim cannot assume responsibility for use ...

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