DS4426T+T&R Maxim Integrated Products, DS4426T+T&R Datasheet

IC DAC I2C-MARGINING 4CH 28-TQFN

DS4426T+T&R

Manufacturer Part Number
DS4426T+T&R
Description
IC DAC I2C-MARGINING 4CH 28-TQFN
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of DS4426T+T&R

Data Interface
I²C
Number Of Converters
4
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
28-TQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power Dissipation (max)
-
Number Of Bits
-
Settling Time
-
The DS4426 contains four I
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
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
19-4541; Rev 1; 7/09
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.
TOP VIEW
*EXPOSED PAD.
Power-Supply Adjustment
Power-Supply Margining
Power-Supply Tracking
Adjustable Current Sink or Source
GAIN3
GAIN2
GAIN1
N.C.
FS1
FS2
FS3
22
23
24
25
26
27
28
2
C bus.
Three Channels of Power-Supply Tracking
21
1
Quad-Channel, I
________________________________________________________________ Maxim Integrated Products
2
+
C interface. Power-supply tracking
20
2
(4mm
THIN QFN
General Description
19
3
DS4426
18
2
×
4
Pin Configuration
C-adjustable current DACs
4mm)
17
5
*EP
16
6
Applications
15
7
14
13
12
11
10
9
8
INN2
INP2
INN1
INP1
A1
A0
GND
2
C-Margining IDACs with
♦ Four Current DACs
♦ Power-Supply Tracking
♦ +2.7V to +5.5V Operation
♦ I
♦ Two Address Input Pins Allow Up to Four Devices
♦ Lead-Free, 28-Pin TQFN Package (4mm x 4mm)
♦ Industrial Temperature Range: -40°C to +85°C
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
* EP = Exposed pad.
Functional Diagram appears at end of data sheet.
DS4426T+
DS4426T+T&R
on Same I
with Exposed Pad
2
C-Compatible Serial Interface
50µA to 200µA Adjustable Full-Scale Range
127 Settings Each for Sink and Source
Power-Supply Sequencing
Ramp-Up and Ramp-Down Tracking Control
Ratiometric Tracking Support
PART
2
C Bus
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
PIN-PACKAGE
28 TQFN-EP*
28 TQFN-EP*
Features
1

Related parts for DS4426T+T&R

DS4426T+T&R Summary of contents

Page 1

... THIN QFN × (4mm 4mm) *EXPOSED PAD. ________________________________________________________________ Maxim Integrated Products 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. 2 C-Margining IDACs with ♦ Four Current DACs 50µA to 200µA Adjustable Full-Scale Range 127 Settings Each for Sink and Source ♦ ...

Page 2

Quad-Channel, I Three Channels of Power-Supply Tracking ABSOLUTE MAXIMUM RATINGS Voltage Range on SDA, SCL Relative to GND ......-0.5V to +6.0V Voltage Range on V Relative to GND ...............-0.5V to +6.0V CC Voltage Range on A0, A1, FS[3:0], GAIN[3:1], INN[3:1], ...

Page 3

Quad-Channel, I Three Channels of Power-Supply Tracking DAC OUTPUT CURRENT CHARACTERISTICS (continued +2.7V to +5.5V -40°C to +85°C PARAMETER SYMBOL Output Voltage for Sinking V Current Output Voltage for Sourcing V OUT:SOURCE Current Full-Scale ...

Page 4

Quad-Channel, I Three Channels of Power-Supply Tracking POWER-SUPPLY TRACKING CHARACTERISTICS (V = +2.7V to +5.5V -40°C to +85°C, see Figure 5 PARAMETER SYMBOL Input Divider Ratio Output Load Feedback Resistor Ratio R Gain Resistor Gain Setting ...

Page 5

Quad-Channel, I Three Channels of Power-Supply Tracking (T = +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. SUPPLY VOLTAGE 600 SDA = SCL = THR[3: GAIN[3:1] = FS[3:0] = OUT[3:0] = OPEN 575 INP[3:1] = INN[3:1] = ...

Page 6

Quad-Channel, I Three Channels of Power-Supply Tracking PIN NAME 1 SDA 2 SCL OUT0 OUT1, OUT2, OUT3 8 GND 11, 13, 15 INP1, INP2, INP3 12, 14, 16 INN1, ...

Page 7

Quad-Channel, I Three Channels of Power-Supply Tracking CONTROL MSB LSB 127 POSITIONS EACH FOR SOURCE AND SINK MODE SOURCE CURRENT OR DAC[3:0] SINK MODE FS[3:0] OUT[3:0] R FS[3:0] Figure 1. Current DAC Detail GAIN INP + G ...

Page 8

Quad-Channel, I Three Channels of Power-Supply Tracking V V MASTER V SLAVE DS4426 TRACKING DISABLED V THRESHOLD GAIN ERROR TRACKING RANGE: DS4426 OVERRIDES SLAVE'S FEEDBACK LOOP Figure 4. Enabling Power-Supply Tracking Using the THR Input THR Inputs for Enabling Power-Supply ...

Page 9

Quad-Channel, I Three Channels of Power-Supply Tracking 5.0V 0.1μF 10kΩ 10kΩ 10kΩ 5.0V R B[3:1] R G[3:1] R A[3:1] 10kΩ R THR[3:1] Figure 5. Typical DC-DC Power-Supply Tracking Application Ratiometric Tracking The DS4426 can maintain a ...

Page 10

Quad-Channel, I Three Channels of Power-Supply Tracking Table 1. Slave Addresses A1 A0 SLAVE ADDRESS (HEX) GND GND GND GND Inputs for Tracking in DC-DC Power When enabling/disabling the power-supply tracking, a ...

Page 11

Quad-Channel, I Three Channels of Power-Supply Tracking Serial Interface Description The following terminology is commonly used to 2 describe I C data transfers Slave Address: The slave address of the DS4426 is determined by ...

Page 12

Quad-Channel, I Three Channels of Power-Supply Tracking SDA t BUF t LOW SCL t t HD:STA R STOP START NOTE: TIMING IS REFERENCED TO V AND V . IL(MAX) IH(MIN) 2 Figure Timing Diagram 2 TYPICAL I ...

Page 13

Quad-Channel, I Three Channels of Power-Supply Tracking Applications Information Example Calculations for an Adjustable In this example, the circuit shown in Figure 8 is used to margin a +2.0V supply by ±20%. The margined power supply has a DC-DC converter ...

Page 14

Quad-Channel, I Three Channels of Power-Supply Tracking Functional Diagram SDA 2 SCL I C CONTROL INTERFACE REF REF 1.24V INP1 INN1 GAIN1 V /2 REF THR1 INP2 INN2 GAIN2 V /2 REF THR2 ...

Page 15

... 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 ____________________ 15 © 2009 Maxim Integrated Products ...

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