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DS4426

Description
Quad-Channel, I2C-Margining IDACs with Three Channels of Power-Supply Tracking
File Size258KB,15 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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DS4426 Overview

Quad-Channel, I2C-Margining IDACs with Three Channels of Power-Supply Tracking

19-4541; Rev 1; 7/09
Quad-Channel, I
2
C-Margining IDACs with
Three Channels of Power-Supply Tracking
General Description
The DS4426 contains four I
2
C-adjustable current DACs
capable of sinking or sourcing current. External resis-
tors set the full-scale range of each output. Each DAC
output has 127 sink and 127 source steps that are pro-
grammed by the I
2
C interface. Power-supply tracking
functionality is provided for three channels using dedi-
cated control inputs. Once power-supply tracking is
accomplished, the current outputs default to zero. Two
address pins allow up to four DS4426 devices to exist
on the same I
2
C bus.
Features
Four Current DACs
50µA to 200µA Adjustable Full-Scale Range
127 Settings Each for Sink and Source
Power-Supply Tracking
Power-Supply Sequencing
Ramp-Up and Ramp-Down Tracking Control
Ratiometric Tracking Support
+2.7V to +5.5V Operation
I
2
C-Compatible Serial Interface
Two Address Input Pins Allow Up to Four Devices
on Same I
2
C Bus
Lead-Free, 28-Pin TQFN Package (4mm x 4mm)
with Exposed Pad
Industrial Temperature Range: -40°C to +85°C
DS4426
Applications
Power-Supply Adjustment
Power-Supply Margining
Power-Supply Tracking
Adjustable Current Sink or Source
Pin Configuration
PART
THR1
THR2
THR3
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 TQFN-EP*
28 TQFN-EP*
DS4426T+
DS4426T+T&R
TOP VIEW
21
FS1 22
FS2 23
FS3 24
GAIN3 25
GAIN2 26
GAIN1 27
N.C. 28
1
SDA
FS0
INN3
16
20
19
18
17
15
14
13
12
INN2
INP2
INN1
INP1
A1
A0
GND
INP3
DNC
+Denotes
a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
*EP
= Exposed pad.
DS4426
11
10
+
2
SCL
3
V
CC
4
OUT0
5
OUT1
*EP
9
8
Functional Diagram appears at end of data sheet.
6
OUT2
7
OUT3
THIN QFN
(4mm
×
4mm)
*EXPOSED PAD.
________________________________________________________________
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.

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