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| 型号： | DDC118IRTCT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 8-CH 20-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PQCC48 |
| 封装： | GREEN, PLASTIC, QFN-48 |
| 文件页数： | 23/35页 |
| 文件大小： | 653K |
| 代理商： | DDC118IRTCT |
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DDC118
SBAS325B JUNE 2004 REVISED APRIL 2009
www.ti.com
3
ELECTRICAL CHARACTERISTICS
At TA = +25°C, AVDD = +5V, DVDD = 3V, VREF = +4.096V, Range 5 (250pC), and continuous mode operation, unless otherwise noted.
Low-Power Mode: TINT = 400s and CLK = 4MHz; High-Speed Mode: TINT = 320s and CLK = 4.8MHz.
Low-Power Mode
High-Speed Mode
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
ANALOG INPUT RANGE
Range 0
10.2
12
13.8
(1)
pC
Range 1
47.5
50
52.5
pC
Range 2
95
100
105
pC
Range 3
142.5
150
157.5
pC
Range 4
190
200
210
pC
Range 5
237.5
250
262.5
pC
Range 6
285
300
315
pC
Range 7
332.5
350
367.5
pC
Negative Full-Scale Range
0.4% of Positive Full-Scale Range
pC
Input Current(2)
750
A
DYNAMIC CHARACTERISTICS
Data Rate
2.5
3.125
kSPS
Integration Time, TINT
Continuous Mode
400
1,000,000
320
S
Integration Time, TINT
Non-continuous Mode, Range 1 to 7
50
S
System Clock Input (CLK)
CLK_4X = 0
4
4.8
MHz
CLK_4X = 1
16
19.2
MHz
Data Clock (DCLK)
16
MHz
ACCURACY
Noise, Low-Level Input(3)
CSENSOR(4) = 50pF, Range 5 (250pC)
5.2
6.5
5.5
7
ppm of
FSR(5), rms
Integral Linearity Error(6)
±0.01% Reading ± 0.5ppm FSR, typ
Integral Linearity Error(6)
±0.025% Reading ± 1.0ppm FSR, max
Resolution
FORMAT = 1
20
Bits
Resolution
FORMAT = 0
16
Bits
Input Bias Current
0.1
10
pA
Range Error Match(7)
All Ranges
0.1
0.5
% of FSR
Range Sensitivity to VREF
VREF = 4.096 ± 0.1V
1:1
Offset Error
Range 5 (250pC)
±400
±1000
ppm of FSR
Offset Error Match(7)
±100
ppm of FSR
DC Bias Voltage(9)
Low-Level Input (< 1% FSR)
±0.05
±2
mV
Power-Supply Rejection Ratio
at dc
±25
±200
ppm of FSR/V
Internal Test Signal
11
pC
Internal Test Accuracy
±10
%
PERFORMANCE OVER TEMPERATURE
Offset Drift
±0.5
±3(8)
ppm of
FSR/
°C
Offset Drift Stability
±0.2
±1(8)
ppm of FSR/
minute
DC Bias Voltage Drift(9)
3
V/°C
Input Bias Current Drift
TA = +25°C to +45°C
0.01
1(8)
pA/
°C
Range Drift(10)
25
ppm/
°C
REFERENCE
Voltage
4.000
4.096
4.200
V
Input Current(11)
Average Value
150
190
A
(1)
indicates that specification is the same as Low-Power Mode.
(2) Exceeding maximum input current specification may damage device.
(3) Input is less than 1% of full scale.
(4) CSENSOR is the capacitance seen at the DDC118 inputs from wiring, photodiode, etc.
(5) FSR is Full-Scale Range.
(6) A best-fit line is used in measuring nonlinearity.
(7) Matching between side A and side B of the same input.
(8) Ensured by design, not production tested.
(9) Voltage produced by the DDC118 at its input which is applied to the sensor.
(10)Range drift does not include external reference drift.
(11)Input reference current decreases with increasing TINT (see the Voltage Reference section, page 11).
(12)Data format is Straight Binary with a small offset. The number of bits in the output word is controlled by the FORMAT pin (see text).
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