DS4422 Datasheet PDF - Maxim Integrated Products

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DS4422
Maxim Integrated Products

Part Number DS4422
Description (DS4422 / DS4424) 7-Bit Sink/Source Current DAC
Page 10 Pages


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Rev 0; 3/08
Two-/Four-Channel, I2C, 7-Bit Sink/Source
Current DAC
General Description
The DS4422 and DS4424 contain two or four I2C 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 I2C interface. The current DAC
outputs power up in a high-impedance state.
www.DataSheet4U.com
Applications
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.
PIN-
PACKAGE
14 TDFN
14 TDFN
14 TDFN
14 TDFN
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
I2C-Compatible Serial Interface
Two Address Pins Allow Four Devices on Same
I2C 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
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
RPU RPU
VCC
SDA
SCL
A1 DS4422/ OUT0
A0 DS4424 OUT1
GND
FS0
RFS0
FS1
RFS1
VCC VOUT0
OUT
DC-DC
CONVERTER
FB
R0A
R0B
VOUT1
OUT
DC-DC
CONVERTER
FB
R1A
R1B
_______________________________________________________________ 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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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 .............................-55°C to +125°C
Soldering Temperature ...............................Refer to the IPC/JEDEC
J-STD-020 Specification.
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
www.DataSheeta4bUs.ocluotme maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
(TA = -40°C to +85°C.)
PARAMETER
SYMBOL
Supply Voltage
VCC (Note 1)
Input Logic 1 (SDA, SCL, A0, A1)
VIH
Input Logic 0 (SDA, SCL, A0, A1)
VIL
Full-Scale Resistor Values
RFS0, RFS1, (Note 2)
RFS2, RFS3
CONDITIONS
MIN TYP MAX
2.7 5.5
0.7 x VCC
VCC + 0.3
-0.3 0.3 x VCC
UNITS
V
V
V
40 160 k
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +5.5V, TA = -40°C to +85°C.)
PARAMETER
SYMBOL
Supply Current
ICC
VCC = 5.5V
(Note 3)
Input Leakage (SDA, SCL)
Output Leakage (SDA)
Output Current Low (SDA)
RFS Voltage
I/O Capacitance
IIL
IL
IOL
VRFS
CI/O
VCC = 5.5V
VOL = 0.4V
VOL = 0.6V
CONDITIONS
DS4422
DS4424
MIN TYP MAX UNITS
250
μA
250
1 μA
1 μA
3
mA
6
0.976
V
10 pF
OUTPUT CURRENT SOURCE CHARACTERISTICS
(VCC = +2.7V to +5.5V, TA = -40°C to +85°C.)
PARAMETER
SYMBOL
Output Voltage for Sinking Current VOUT:SINK (Note 4)
Output Voltage for Sourcing
Current
VOUT:SOURCE (Note 4)
CONDITIONS
Full-Scale Sink Output Current
IOUT:SINK (Notes 1, 4)
Full-Scale Source Output Current IOUT:SOURCE (Notes 1, 4)
Output Current Full-Scale
Accuracy
IOUT:FS
+25°C, VCC = 3.3V; using 0.1% RFS
resistor (Note 2), VOUT0 = VOUT1 = 1.2V
Output Current Temperature
Coefficient
IOUT:TC (Note 5)
MIN
0.5
0
50
-200
TYP
MAX
3.5
VCC -
0.75
200
-50
UNITS
V
V
μA
μA
±6 %
±75 ppm/°C
2 _______________________________________________________________________________________



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Two-/Four-Channel, I2C, 7-Bit Sink/Source
Current DAC
OUTPUT CURRENT SOURCE CHARACTERISTICS (continued)
(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
www.DataSheet4OUu.ctopmut-Voltage Change
Output Leakage Current at Zero
Current Setting
SYMBOL
CONDITIONS
DC source
DC sink
DC source, VOUT measure at 1.2V
DC sink, VOUT measure at 1.2V
IZERO
MIN
-1
Output Current Differential
Linearity
Output Current Integral Linearity
DNL
INL
(Notes 6, 7)
(Notes 7, 8)
-0.5
-1
TYP
0.32
0.42
0.16
0.16
MAX
UNITS
%/V
%/V
+1 μA
+0.5
+1
LSB
LSB
AC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +5.5V, TA = -40°C to +85°C.)
PARAMETER
SCL Clock Frequency
Bus Free Time Between STOP
and START Conditions
SYMBOL
fSCL
(Note 9)
tBUF
CONDITIONS
MIN TYP MAX UNITS
0 400 kHz
1.3 μs
Hold Time (Repeated) START
Condition
Low Period of SCL
High Period of SCL
Data Hold Time
Data Setup Time
START Setup Time
SDA and SCL Rise Time
SDA and SCL Fall Time
STOP Setup Time
SDA and SCL Capacitive
Loading
tHD:STA
tLOW
tHIGH
tDH:DAT
tSU:DAT
tSU:STA
tR
tF
tSU:STO
(Note 10)
(Note 10)
CB (Note 10)
0.6
1.3
0.6
0
100
0.6
20 + 0.1CB
20 + 0.1CB
0.6
μs
μs
μs
0.9 μs
ns
μs
300 ns
300 ns
μs
400 pF
Note 1: All voltages with respect to ground. Currents entering the IC are specified positive, and currents exiting the IC are negative.
Note 2: Input resistors (RFS) must be between the speciifed values to ensure the device meets its accuracy and linearity specifications.
Note 3: Supply current specified with all outputs set to zero current setting. A0 and A1 are connected to GND. SDA and SCL are con-
nected to VCC. Excludes current through RFS resistors (IRFS). Total current including IRFS is ICC + (2 x IRFS).
Note 4: The output-voltage range must be satisfied to ensure the device meets its accuracy and linearity specifications.
Note 5: Temperature drift excludes drift caused by external resistor.
Note 6: Differential linearity is defined as the difference between the expected incremental current increase with respect to position
and the actual increase. The expected incremental increase is the full-scale range divided by 127.
Note 7: Guaranteed by design.
Note 8: Integral linearity is defined as the difference between the expected value as a function of the setting and the actual value.
The expected value is a straight line between the zero and the full-scale values proportional to the setting.
Note 9: Timing shown is for fast-mode (400kHz) operation. This device is also backward compatible with I2C standard-mode timing.
Note 10: CB—total capacitance of one bus line in pF.
_______________________________________________________________________________________ 3



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Two-/Four-Channel, I2C, 7-Bit Sink/Source
Current DAC
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
250
www.DataSheet4U.c20o0m
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
150
100
DOES NOT INCLUDE CURRENT DRAWN BY
RESISTORS CONNECTED TO FS0, FS1, FS2,
50 OR FS3
SUPPLY CURRENT
vs. TEMPERATURE
250
VCC = 5.0V
200
150
VCC = 2.7V
VCC = 3.3V
100
DOES NOT INCLUDE CURRENT DRAWN BY
RESISTORS CONNECTED TO FS0, FS1, FS2,
50 OR FS3
VOLTCO (SOURCE)
-150
40kΩ LOAD ON FS0, FS1, FS2, AND FS3
-175
-200
-225
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
VOLTCO (SINK)
250
40kΩ LOAD ON FS0, FS1, FS2, AND FS3
225
200
0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
TEMPERATURE COEFFICIENT
vs. SETTING (SOURCE)
200
FOR THE 50μA TO 200μA CURRENT SOURCE
RANGE
150
100 +25°C TO -40°C
50
-250
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VOUT (V)
TEMPERATURE COEFFICIENT
vs. SETTING (SINK)
50
+25°C TO -40°C
0
-50 +25°C TO +85°C
-100
175
150
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
VOUT (V)
0
-50
-100
0
+25°C TO +85°C
25 50 75 100 125
SETTING (DEC)
-150
-200
FOR THE 50μA TO 200μA CURRENT SINK
RANGE
-250
0 25 50 75 100
SETTING (DEC)
125
INTEGRAL LINEARITY
1.00
0.75
FOR THE 50μA TO 200μA CURRENT SOURCE
AND SINK RANGE
0.50
0.25
0
-0.25
-0.50
-0.75
-1.00
0
25 50 75 100 125
SETTING (DEC)
DIFFERENTIAL LINEARITY
1.0
0.8
FOR THE 50μA TO 200μA CURRENT SOURCE
AND SINK RANGE
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
25 50 75 100 125
SETTING (DEC)
4 _______________________________________________________________________________________



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