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DDC232 Datasheet, PDF (3/28 Pages) Burr-Brown (TI) – 32-Channel, Current-Input Analog-to-Digital Converter
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DDC232
www.ti.com
SBAS331C – AUGUST 2004 – REVISED SEPTEMBER 2006
ELECTRICAL CHARACTERISTICS
At TA = +25°C, AVDD = +5V, DVDD = +3.0V, VREF = +4.096V, tINT = 333µs in Low-Power mode (CLK = 5MHz),
Range = 7, and continuous mode operation, unless otherwise noted.
PARAMETER
ANALOG INPUT RANGE
Range 1
Range 2
Range 3
Range 4
Range 5
Range 6
Range 7
Negative Full-Scale Range
DYNAMIC CHARACTERISTICS
Data Rate
Integration Time, tINT
System Clock (CLK)
Data Clock (DCLK)
Configuration Clock (CLK_CFG)
ACCURACY
Noise, Low-Level Input(1)
Integral Linearity Error(4)
Resolution
Input Bias Current
Range Error Match(5)
Range Sensitivity to VREF
Offset Error
Offset Error Match(5)
DC Bias Voltage(6)
Power-Supply Rejection Ratio
TEST CONDITIONS
DDC232C
MIN
TYP
MAX
DDC232CK
MIN
TYP
MAX
UNIT
45
50
55
45
50
55
pC
90
100
110
90
100
110
pC
135
150
165
135
150
165
pC
180
200
220
180
200
220
pC
225
250
275
225
250
275
pC
270
300
330
270
300
330
pC
315
350
385
315
350
385
pC
–0.4% of Positive Full-Scale Range
–0.4% of Positive Full-Scale Range
pC
Low-Power Mode
3
3.125
High-Speed Mode
Not Supported
Continuous Mode, Low-Power Mode
320
1,000,000
320
Continuous Mode, High-Speed Mode
Not Supported
162
Non-Continuous Mode
50
50
Low-Power Mode, Clk_4x = 0
1
5
1
High-Speed Mode, Clk_4x = 0
1
10
1
Low-Power Mode, Clk_4x = 1
4
20
4
High-Speed Mode, Clk_4x = 1
4
40
4
20
20
3
3.125
6
6.2
1,000,000
1,000,000
5
10
20
40
20
20
kSPS
kSPS
µs
µs
µs
MHz
MHz
MHz
MHz
MHz
MHz
CSENSOR(2) = 50pF
5.3
7
±0.025% Reading ± 1.0ppm FSR, typ
±0.05% Reading ± 1.5ppm FSR, max
Format = 1
20
20
Format = 0
16
16
±0.1
±10
0.1
0.5
VREF = 4.096 ±0.1V
1:1
±200
±1000
±100
Low-Level Input (< 1% FSR)
±0.1
±2
at DC
100
±800
ppm of FSR(3), rms
±0.1
0.1
1:1
±200
±100
±0.1
100
±10
0.5
±1000
±2
±800
Bits
Bits
pA
% of FSR
ppm of FSR
ppm of FSR
mV
ppm of FSR/V
(1) Input is less than 1% of full-scale.
(2) CSENSOR is the capacitance seen at the DDC232 inputs from wiring, photodiode, etc.
(3) FSR is Full-Scale Range.
(4) A best-fit line is used in measuring nonlinearity.
(5) Matching between side A and side B of the same input.
(6) Voltage produced by the DDC232 at its input that is applied to the sensor.
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