LTC2430_15 Datasheet, PDF (6/40 Pages) Linear Technology – 20-Bit No Latency ADCs with Differential Input and Differential Reference

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