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DS4412
Dual-Channel, I2C Adjustable
Sink/Source Current DAC
_______________________________________________________________________________________
3
Note 1: All voltages with respect to ground, currents entering the IC are specified positive and currents exiting the IC are negative.
Note 2: Supply current specified with all outputs set to zero current setting with all inputs driven to well-defined logic levels. SDA and
SCL are connected to VCC. Excludes current through RFS resistors (IRFS). Total current includes ICC + 2.5 x (IRFS0 + IRFS0).
Note 3: The output voltage range must be satisfied to ensure the device meets its accuracy and linearity specifications.
Note 4: Input resistors RFS must be between 2.25k
Ω and 9.0kΩ 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 15.
Note 7: 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 8: Timing shown is for fast-mode (400kHz) operation. This device is also backward compatible with I2C standard-mode timing.
Note 9: CB—total capacitance of one bus line in pF.
OUTPUT CURRENT CHARACTERISTICS (continued)
(VCC = +2.7V to +5.5V, TA = -40°C to +85°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC source
+0.36
Output-Current Variation due to
Power-Supply Change
DC sink
+0.12
%/V
DC source, VOUT measured at 1.2V
-0.02
Output-Current Variation due to
Output Voltage Change
DC sink, VOUT measured at 1.2V
+0.12
%/V
Output Leakage Current at Zero
Current Setting
IZERO
-1
+1
μA
Output-Current Differential
Linearity
DNL
(Note 6)
0.5
LSB
Output-Current Integral Linearity
INL
(Note 7)
1
LSB
I2C AC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +5.5V, TA = -40°C to +85°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SCL Clock Frequency
fSCL
(Note 8)
0
400
kHz
Bus Free Time Between STOP
and START Conditions
tBUF
1.3
s
Hold Time (Repeated) START
Condition
tHD:STA
0.6
s
Low Period of SCL
tLOW
1.3
s
High Period of SCL
tHIGH
0.6
s
Data Hold Time
tDH:DAT
0
0.9
s
Data Setup Time
tSU:DAT
100
ns
START Setup Time
tSU:STA
0.6
s
SDA and SCL Rise Time
tR
(Note 9)
20 +
0.1CB
300
ns
SDA and SCL Fall Time
tF
(Note 9)
20 +
0.1CB
300
ns
STOP Setup Time
tSU:STO
0.6
s
SDA and SCL Capacitive Loading
CB
(Note 9)
400
pF
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