English
Language : 

DDC232_15 Datasheet, PDF (3/34 Pages) Texas Instruments – 32-Channel, Current-Input Analog-to-Digital Converter
◁
DDC232
www.ti.com
SBAS331D – AUGUST 2004 – REVISED APRIL 2010
ELECTRICAL CHARACTERISTICS
At TA = +25°C, AVDD = +5V, DVDD = +3.0V, VREF = +4.096V, tINT = 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
ANALOG INPUT RANGE
Range 0
12.5
12.5
pC
Range 1
45
50
55
45
50
55
pC
Range 2
90
100
110
90
100
110
pC
Range 3
135
150
165
135
150
165
pC
Range 4
180
200
220
180
200
220
pC
Range 5
225
250
275
225
250
275
pC
Range 6
270
300
330
270
300
330
pC
Range 7
315
350
385
315
350
385
pC
Negative Full-Scale Range
–0.4% of Positive Full-Scale Range
–0.4% of Positive Full-Scale Range
pC
DYNAMIC CHARACTERISTICS
Data Rate
3
3.125
6
6.2
kSPS
Integration Time, tINT
Continuous Mode
320
Noncontinuous Mode
50
1,000,000
160
50
1,000,000
ms
ms
System Clock (CLK)
Clk_4x = 0
1
5
1
10
MHz
Clk_4x = 1
4
20
4
40
MHz
Data Clock (DCLK)
20
20
MHz
Configuration Clock (CLK_CFG)
20
20
MHz
ACCURACY
Noise, Low-Level Input(1)
Integral Linearity Error(4)
CSENSOR (2) = 50pF
5.3
7
±0.025% Reading ± 1.0ppm FSR, typ
5.3
7
±0.025% Reading ± 1.0ppm FSR, typ
ppm of FSR(3), rms
Resolution
±0.05% Reading ± 1.5ppm FSR, max ±0.05% Reading ± 1.5ppm FSR, max
No Missing Codes, Format = 1
20
19 (5)
Bits
No Missing Codes, Format = 0
16
16
Bits
Input Bias Current
Range Error Match(6)
±0.1
±10
0.1
0.5
±0.1
±10
0.1
0.5
pA
% of FSR
Range Sensitivity to VREF
VREF = 4.096 ±0.1V
1:1
1:1
Offset Error
Offset Error Match(6)
DC Bias Voltage(7)
Low-Level Input (< 1% FSR)
±200
±100
±0.1
±1000
±2
±200
±100
±0.1
±1000
±2
ppm of FSR
ppm of FSR
mV
Power-Supply Rejection Ratio
at DC
100
±800
100
±800
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) Output word is 20 bits with 19 bits no missing codes.
(6) Matching between side A and side B of the same input.
(7) Voltage produced by the DDC232 at its input that is applied to the sensor.
Copyright © 2004–2010, Texas Instruments Incorporated
Product Folder Link(s): DDC232
Submit Documentation Feedback
3
 ▷