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LTC2431CMS Datasheet(PDF) 6 Page - Linear Technology

Part # LTC2431CMS
Description  20-Bit No Latency Delta-Sigma ADCs with Differential Input and Differential Reference
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2431CMS Datasheet(HTML) 6 Page - Linear Technology

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LTC2430/LTC2431
6
24301f
TYPICAL PERFOR A CE CHARACTERISTICS
Total Unadjusted Error
(VCC = 5V, VREF = 5V)
INPUT VOLTAGE (V)
–2.5
1
3
5
1.5
24301 G01
–1
–3
0
2
4
–2
–4
–5
–1.5
–2
– 0.5
–1
0.5
1
2
0
2.5
VCC = 5V
VREF = 5V
VINCM = VINCM = 2.5V
FO = GND
85
°C
25
°C
–45
°C
INPUT VOLTAGE (V)
–1.25
1
3
5
0.75
24301 G02
–1
–3
0
2
4
–2
–4
–5
–0.75
–1
–0.25
–0.5
0.25 0.5
1
0
1.25
VCC = 5V
VREF = 2.5V
VINCM = VINCM = 1.25V
FO = GND
85
°C
–45
°C
25
°C
INPUT VOLTAGE (V)
–1.25
20
15
10
5
0
–5
–10
–15
–20
0.75
24301 G03
0.25
1.25
0.5
–1
0
1
VCC = 2.7V
VREF = 2.5V
VINCM = VINCM = 1.25V
FO = GND
85
°C
–45
°C
25
°C
–0.75
–0.25
–0.5
Total Unadjusted Error
(VCC = 5V, VREF = 2.5V)
Total Unadjusted Error
(VCC = 2.7V, VREF = 2.5V)
Integral Nonlinearity
(VCC = 5V, VREF = 5V)
INPUT VOLTAGE (V)
–2.5
1
3
5
1.5
24301 G04
–1
–3
0
2
4
–2
–4
–5
–1.5
–2
–0.5
–1
0.5
1
2
0
2.5
VCC = 5V
VREF = 5V
VINCM = VINCM = 2.5V
FO = GND
85
°C
25
°C
–45
°C
Integral Nonlinearity
(VCC = 5V, VREF = 2.5V)
INPUT VOLTAGE (V)
–1.25
1
3
5
0.75
24301 G05
–1
–3
0
2
4
–2
–4
–5
–1
0.25 0.5
1
0
1.25
VCC = 5V
VREF = 2.5V
VINCM = VINCM = 1.25V
FO = GND
85
°C
–45
°C
25
°C
–0.75
–0.25
–0.5
Integral Nonlinearity
(VCC = 2.7V, VREF = 2.5V)
INPUT VOLTAGE (V)
–1.25
20
15
10
5
0
–5
–10
–15
–20
0.75
24301 G06
0.25
1.25
0.5
–1
0
1
VCC = 2.7V
VREF = 2.5V
VINCM = VINCM = 1.25V
FO = GND
85
°C
–45
°C
25
°C
–0.75
–0.25
–0.5
Noise Histogram (Output Rate =
7.5Hz, VCC = 5V, VREF = 5V)
OUTPUT CODE (ppm OF VREF)
–2.5
40
35
30
25
20
15
10
5
0
1.5
24301 G07
–1.5
–0.5
0.5
2.5
1
–2
–1
0
2
10,000 CONSECUTIVE
READINGS
VCC = 5V
VREF = 5V
VIN = 0V
VINCM = 2.5V
FO = GND
TA = 25°C
GAUSSIAN
DISTRIBUTION
m = – 0.25ppm
σ = 0.550ppm
Noise Histogram (Output Rate =
7.5Hz, VCC = 2.7V, VREF = 2.5V)
OUTPUT CODE (ppm OF VREF)
–4
12
16
20
4
24301 G08
8
4
10
14
18
6
2
0
–2
–3
0
–1
23
5
1
6
10,000 CONSECUTIVE
READINGS
VCC = 2.7V
VREF = 2.5V
VIN = 0V
VINCM = 2.5V
FO = GND
TA = 25°C
GAUSSIAN
DISTRIBUTION
m = –1.07ppm
σ = 1.06ppm
RMS Noise
vs Input Differential Voltage
INPUT DIFFERENTIAL VOLTAGE (V)
–2.5
0.6
0.8
1.0
1.5
24301 G10
0.4
0.2
0.5
0.7
0.9
0.3
0.1
0
–1.5
–2
– 0.5
–1
0.5
1
2
0
2.5
VCC = 5V
VREF = 5V
VINCM = 2.5V
FO = GND
TA = 25°C


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