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DS4432
Dual-Channel, I2C, 7-Bit 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:
Input resistors (RFS) must be between the specified values to ensure the device meets its accuracy and linearity specifications.
Note 3:
Supply current specified with all outputs set to zero current setting. SDA and SCL are connected 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.
OUTPUT CURRENT SOURCE CHARACTERISTICS (continued)
(VCC = +2.7V to +5.5V, TA = -40°C to +85°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC source, VOUT measured at 1.2V
0.41
Output Current Variation Due to
Power-Supply Change
DC sink, VOUT measured at 1.2V
0.41
%/V
DC source, VCC = 3.3V
0.08
Output Current Variation Due to
Output-Voltage Change
DC sink, VCC = 3.3V
0.14
%/V
Output Leakage Current at Zero
Current Setting
IZERO
-1
+1
μA
Output Current Differential
Linearity
DNL
(Notes 6, 7)
-0.5
+0.5
LSB
Output Current Integral Linearity
INL
(Notes 7, 8)
-1
+1
LSB
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 9)
0
400
kHz
Bus Free Time Between STOP
and START Conditions
tBUF
1.3
μs
Hold Time (Repeated) START
Condition
tHD:STA
0.6
μs
Low Period of SCL
tLOW
1.3
μs
High Period of SCL
tHIGH
0.6
μs
Data Hold Time
tHD:DAT
0
0.9
μs
Data Setup Time
tSU:DAT
100
ns
START Setup Time
tSU:STA
0.6
μs
SDA and SCL Rise Time
tR
(Note 10)
20 + 0.1CB
300
ns
SDA and SCL Fall Time
tF
(Note 10)
20 + 0.1CB
300
ns
STOP Setup Time
tSU:STO
0.6
μs
SDA and SCL Capacitive
Loading
CB
(Note 10)
400
pF
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