DDC232_17 Datasheet, PDF (4/34 Pages) Texas Instruments – 32-Channel, Current-Input Analog-to-Digital Converter

DDC232
SBAS331D – AUGUST 2004 – REVISED APRIL 2010
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ELECTRICAL CHARACTERISTICS (continued)
At T_A = +25°C, AVDD = +5V, DVDD = +3.0V, VREF = +4.096V, t_INT = 333ms for DDC232C or 166ms for
DDC232CK,
Range 7, and continuous mode operation, unless otherwise noted.
DDC232C
DDC232CK
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
PERFORMANCE OVER TEMPERATURE
Offset Drift
Offset Drift Stability
DC Bias Voltage Drift⁽⁹⁾
Input Bias Current Drift
Range Drift⁽¹⁰⁾
Range Drift Match⁽¹¹⁾
T_A = +25°C to +45°C
±0.5
5 ⁽⁸⁾
±0.2
2 ⁽⁸⁾
±3
0.01
1 ⁽⁸⁾
25
50
±5
±0.5
±0.2
±3
0.01
25
±5
5 ⁽⁸⁾
ppm of FSR/°C
2 ⁽⁸⁾
ppm of FSR/minute
mV/°C
1 ⁽⁸⁾
pA/°C
50
ppm/°C
ppm/°C
REFERENCE
Voltage
Input Current⁽¹²⁾
DIGITAL INPUT/OUTPUT
4.000
4.096
4.200
4.000
4.096
4.200
V
Average Value with t_INT = 333ms
325
Average Value with t_INT = 166.5ms
mA
650
mA
Logic Levels
V_IH
V_IL
V_OH
V_OL
Input Current (I_IN)
Data Format⁽¹³⁾
I_OH = –500mA
I_OL = 500mA
0 < V_IN < DVDD
0.8 DVDD
DVDD + 0.1 0.8 DVDD
DVDD + 0.1
V
–0.1
0.2 DVDD
–0.1
0.2 DVDD
V
DVDD – 0.4
DVDD – 0.4
V
0.4
0.4
V
±10
±10
mA
Straight Binary
Straight Binary
POWER-SUPPLY REQUIREMENTS
Analog Power-Supply Voltage (AVDD)
4.75
5.0
5.25
4.9
5.0
5.1
V
Digital Power-Supply Voltage (DVDD)
2.7
3.0
3.6
2.7
3.0
3.6
V
Supply Current
Analog Current
41
60
mA
Digital Current
3.7
8.0
mA
Total Power Dissipation
224
288
290
mW
Per Channel Power Dissipation
7
9
10
mW/Channel
(8) Ensured by design, not production tested.
(9) Voltage produced by the DDC232 at its input that is applied to the sensor.
(10) Range drift does not include external reference drift.
(11) Matching between side A and side B of the same input.
(12) Input reference current decreases with increasing t_INT (see the Voltage Reference section, page 10).
(13) Data format is Straight Binary with a small offset. The number of bits in the output word is controlled by the Format bit.
4
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