Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - DA converter (DAC) TDFN 14 EP

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or visit Maxim’s website at www.maxim-ic.com.

_______________________________________________________________

Maxim Integrated Products

General Description

The DS4422 and DS4424 contain two or four I

C 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 I

C interface. The current DAC

outputs power up in a high-impedance state.

Applications

Power-Supply Adjustment

Power-Supply Margining

Adjustable Current Sink or Source

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

♦ I

C-Compatible Serial Interface

♦ Two Address Pins Allow Four Devices on Same

C 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

DS4422/DS4424

Two-/Four-Channel, I

C, 7-Bit Sink/Source

Current DAC

DC-DC

CONVERTER

OUT

SDA

SCL

A1 OUT0

OUT1

GND

FS0

FS1

OUT0

FS0

FS1

DC-DC

CONVERTER

OUT

OUT1

DS4422/

DS4424

Typical Operating Circuit

Ordering Information

19-4744; Rev 1; 7/09

Denotes a lead(Pb)-free/RoHS-compliant package.

T&R = Tape and reel.

EP = Exposed pad.

PART OUTPUTS TEMP RANGE

PIN-

PACKAGE

DS4422N+ 2 -40°C to +85°C 14 TDFN-EP

DS4422N+T&R 2 -40°C to +85°C 14 TDFN-EP

DS4424N+ 4 -40°C to +85°C 14 TDFN-EP

DS4424N+T&R 4 -40°C to +85°C 14 TDFN-EP

Pin Configuration appears at end of data sheet.

Summary of content (11 pages)

PAGE 1
9-4744; Rev 1; 7/09 Two-/Four-Channel, I2C, 7-Bit Sink/Source Current DAC The DS4422 and DS4424 contain two or four I2C programmable 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.
PAGE 2
DS4422/DS4424 Two-/Four-Channel, I2C, 7-Bit Sink/Source Current DAC ABSOLUTE MAXIMUM RATINGS Voltage Range on VCC, SDA, and SCL 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 (VCC + 0.5V) (Not to exceed 6.0V.) Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................
PAGE 3
Two-/Four-Channel, I2C, 7-Bit Sink/Source Current DAC DS4422/DS4424 OUTPUT CURRENT SOURCE CHARACTERISTICS (continued) (VCC = +2.7V to +5.5V, TA = -40°C to +85°C.) PARAMETER SYMBOL CONDITIONS MIN TYP Output Current Variation Due to Power-Supply Change DC source 0.32 DC sink 0.42 Output Current Variation Due to Output-Voltage Change DC source, V OUT measure at 1.2V 0.16 DC sink, VOUT measure at 1.2V 0.
PAGE 4
Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. TEMPERATURE 200 100 DOES NOT INCLUDE CURRENT DRAWN BY RESISTORS CONNECTED TO FS0, FS1, FS2, OR FS3 -175 150 VCC = 3.3V VCC = 2.7V DOES NOT INCLUDE CURRENT DRAWN BY RESISTORS CONNECTED TO FS0, FS1, FS2, OR FS3 50 0 3.0 3.5 4.0 4.5 5.0 5.5 -250 -40 -20 0 20 40 60 0 80 VOUT (V) VOLTCO (SINK) TEMPERATURE COEFFICIENT vs. SETTING (SOURCE) TEMPERATURE COEFFICIENT vs.
PAGE 5
Two-/Four-Channel, I2C, 7-Bit Sink/Source Current DAC PIN NAME FUNCTION DS4424 DS4422 1 1 SDA I2C Serial Data. Input/output for I2C data. 2 2 SCL I2C Serial Clock. Input for I2C clock. 3 3 GND Ground 4 — FS3 5 — FS2 6 6 FS1 7 7 FS0 8 8 OUT0 10 10 OUT1 12 — OUT2 14 — OUT3 9, 11 9, 11 A0, A1 13 13 VCC Power Supply — 4, 5, 12, 14 N.C. No Connection — — EP Full-Scale Calibration Input.
PAGE 6
DS4422/DS4424 Two-/Four-Channel, I2C, 7-Bit Sink/Source Current DAC Detailed Description The DS4422/DS4424 contain two or four I2C adjustable 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 be controlled by the I2C interface.
PAGE 7
Two-/Four-Channel, I2C, 7-Bit Sink/Source Current DAC IFS = (0.976V/80kΩ) x (127/16) = 96.838µA The MSB of the output register is 1, so the output is sourcing the value corresponding to position 2Ah (42 decimal). The magnitude of the output current is equal to: 96.838µA x (42/127) = 32.
PAGE 8
DS4422/DS4424 Two-/Four-Channel, I2C, 7-Bit Sink/Source Current DAC TYPICAL I2C WRITE TRANSACTION MSB START A1 LSB A0 1 0 0 0 0 R/W MSB SLAVE ACK b7 READ/ WRITE SLAVE ADDRESS* LSB b6 b5 b4 b3 b2 b1 b0 MSB SLAVE ACK b7 LSB b6 b5 b4 REGISTER/MEMORY ADDRESS b3 b2 b1 b0 SLAVE ACK STOP DATA *THE SLAVE ADDRESS IS DETERMINED BY ADDRESS PINS A0 AND A1.
PAGE 9
Two-/Four-Channel, I2C, 7-Bit Sink/Source Current DAC DS4422/DS4424 VCC VOUT* = 2.0V 4.7kΩ 4.7kΩ OUT VCC SDA SCL A1 A0 GND DC-DC CONVERTER DS4422/ DS4424 I0A R0A = 4.00kΩ FB OUT0 VFB* = 0.8V I0B R0B= 2.67kΩ FS0 IOUT0 RFS0 = 80kΩ *VOUT AND VFB VALUES ARE DETERMINED BY THE DC-DC CONVERTER AND SHOULD NOT BE CONFUSED WITH VOUT AND VRFS OF THE DS4422/DS4424. Figure 3.
PAGE 10
Two-/Four-Channel, I2C, 7-Bit Sink/Source Current DAC DS4422/DS4424 Pin Configuration Package Information For the latest package outline information, go to www.maxim-ic.com/packages. TOP VIEW 1 14 OUT3 (N.C.) SCL 2 13 VCC 12 OUT2 (N.C.) 11 A1 10 OUT1 9 A0 8 OUT0 GND 3 FS3 (N.C.) 4 FS2 (N.C.) 5 FS1 6 + SDA DS4422/ DS4424 PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 14 TDFN-EP T1433+2 21-0137 *EP FS0 7 ( ) INDICATES DS4422 ONLY.
PAGE 11
Two-/Four-Channel, I2C, 7-Bit Sink/Source Current DAC PAGES CHANGED REVISION NUMBER REVISION DATE 0 3/08 Initial release. — 1 7/09 Added the Power Rail Considerations section. 9 DESCRIPTION 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.