Document
19-4541; Rev 0; 4/09
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Quad-Channel, I2C-Margining IDACs with Three Channels of Power-Supply Tracking
General Description
The DS4426 contains four I2C-adjustable current DACs capable of sinking or sourcing current. External resistors set the full-scale range of each output. Each DAC output has 127 sink and 127 source steps that are programmed by the I2C interface. Power-supply tracking functionality is provided for three channels using dedicated 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 I2C 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 ♦ I2C-Compatible Serial Interface ♦ Two Address Input Pins Allow Up to Four Devices on Same I2C 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 VCC 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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Quad-Channel, I2C-Margining IDACs with Three Channels of Power-Supply Tracking DS4426
ABSOLUTE MAXIMUM RATINGS
Voltage Range on SDA, SCL Relative to GND ......-0.5V to +6.0V Voltage Range on VCC Relative to GND ...............-0.5V to +6.0V Voltage Range on A0, A1, FS[3:0], GAIN[3:1], INN[3:1], INP[3:1], and THR[3:1] Relative to GND ......................................-0.5V to (VCC + 0.5V)* *Not to exceed +6.0V.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................-55°C to +125°C Soldering Temperature...........................Refer to the IPC/JEDEC J-STD-020 Specification.
RECOMMENDED OPERATING CONDITIONS
(TA = -40°C to +85°C.)
PARAMETER Supply Voltage Input Logic 1 (SDA, SCL, A0, A1) Input Logic 0 (SDA, SCL, A0, A1) Full-Scale Resistor Values SYMBOL VCC VIH VIL RFS[3:0] (Note 2) (Note 1) CONDITIONS MIN 2.7 0.7 x VCC -0.3 40 TYP MAX 5.5 VCC + 0.3 0.3 x VCC 160 UNITS V V V k
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +5.5V, TA = -40°C to +85°C.)
PARAMETER Supply Current Input Leakage Current (SDA, SCL) RFS Voltage Reference Voltage Temperature Coefficient Output Leakage Current (SDA) Output-Current Low (SDA) I/O Capacitance IL I OL CI/O VOL = +0.4V VOL = +0.6V -1 3 6 10 SYMBOL ICC I IL VRFS VREF CONDITIONS VCC = +5.5V (Note 3) VCC = +5.5V TA = +25°C -1 0.940 0.990 1.24 ±100 +1 MIN TYP MAX 0.9 +1 1.040 UNITS mA μA V V ppm/°C μA mA pF
DAC OUTPUT CURRENT CHARACTERISTICS
(VCC = +2.7V to +5.5V, TA = -40°C to +85°C.)
PARAMETER Output Current Variation Due to Power-Supply Change Output Current Variation Due to Output-Voltage Change SYMBOL CONDITIONS DC source, V OUT measured at +1.2V DC sink, VOUT measured at +1.2V DC source, VCC = +3.6V DC sink, VCC = +3.6V MIN TYP 0.33 0.33 0.15 0.30 MAX UNITS %/V %/V
2
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Quad-Channel, I2C-Margining IDACs with Three Channels of Power-Supply Tracking
DAC OUTPUT CURRENT CHARACTERISTICS (continued)
(VCC = +2.7V to +5.5V, TA = -40°C to +85°C.)
PARAMETER Output Voltage for Sinking Current Output Voltage for Sourcing Current Full-Scale Sink Output Current Full-Scale Source Output Current Output-Current Full-Scale Accuracy Output-Current Temperature Coefficient Output-Current Power-Supply Rejection Ratio Output-Leakage Current at Zero Current Setting Output-Current Differential Linearity Output-Current Integral Linearity I ZERO DNL INL (Note 6) (Note 7) -1 SYMBOL VOUT:SINK (Note 4) CONDITIONS M.