Datasheet
LTC2430/LTC2431
6
24301f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Total Unadjusted Error
(V
CC
= 5V, V
REF
= 5V)
INPUT VOLTAGE (V)
–2.5
TUE (ppm OF V
REF
)
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
V
CC
= 5V
V
REF
= 5V
V
INCM
= V
INCM
= 2.5V
F
O
= GND
85°C25°C
–45°C
INPUT VOLTAGE (V)
–1.25
TUE (ppm OF V
REF
)
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
V
CC
= 5V
V
REF
= 2.5V
V
INCM
= V
INCM
= 1.25V
F
O
= GND
85°C
–45°C
25°C
INPUT VOLTAGE (V)
–1.25
TUE (ppm OF V
REF
)
20
15
10
5
0
–5
–10
–15
–20
0.75
24301 G03
0.25 1.250.5–1 0 1
V
CC
= 2.7V
V
REF
= 2.5V
V
INCM
= V
INCM
= 1.25V
F
O
= GND
85°C
–45°C
25°C
–0.75
–0.25–0.5
Total Unadjusted Error
(V
CC
= 5V, V
REF
= 2.5V)
Total Unadjusted Error
(V
CC
= 2.7V, V
REF
= 2.5V)
Integral Nonlinearity
(V
CC
= 5V, V
REF
= 5V)
INPUT VOLTAGE (V)
–2.5
INL (ppm OF V
REF
)
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
V
CC
= 5V
V
REF
= 5V
V
INCM
= V
INCM
= 2.5V
F
O
= GND
85°C
25°C
–45°C
Integral Nonlinearity
(V
CC
= 5V, V
REF
= 2.5V)
INPUT VOLTAGE (V)
–1.25
INL (ppm OF V
REF
)
1
3
5
0.75
24301 G05
–1
–3
0
2
4
–2
–4
–5
–1 0.25 0.5 1
0
1.25
V
CC
= 5V
V
REF
= 2.5V
V
INCM
= V
INCM
= 1.25V
F
O
= GND
85°C
–45°C
25°C
–0.75
–0.25–0.5
Integral Nonlinearity
(V
CC
= 2.7V, V
REF
= 2.5V)
INPUT VOLTAGE (V)
–1.25
INL (ppm OF V
REF
)
20
15
10
5
0
–5
–10
–15
–20
0.75
24301 G06
0.25 1.250.5–1 0 1
V
CC
= 2.7V
V
REF
= 2.5V
V
INCM
= V
INCM
= 1.25V
F
O
= GND
85°C
–45°C
25°C
–0.75
–0.25–0.5
Noise Histogram (Output Rate =
7.5Hz, V
CC
= 5V, V
REF
= 5V)
OUTPUT CODE (ppm OF V
REF
)
–2.5
NUMBER OF READINGS (%)
40
35
30
25
20
15
10
5
0
1.5
24301 G07
–1.5 –0.5 0.5 2.51–2 –1 0 2
10,000 CONSECUTIVE
READINGS
V
CC
= 5V
V
REF
= 5V
V
IN
= 0V
V
INCM
= 2.5V
F
O
= GND
T
A
= 25°C
GAUSSIAN
DISTRIBUTION
m = –0.25ppm
σ = 0.550ppm
Noise Histogram (Output Rate =
7.5Hz, V
CC
= 2.7V, V
REF
= 2.5V)
OUTPUT CODE (ppm OF V
REF
)
–4
NUMBER OF READINGS (%)
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
V
CC
= 2.7V
V
REF
= 2.5V
V
IN
= 0V
V
INCM
= 2.5V
F
O
= GND
T
A
= 25°C
GAUSSIAN
DISTRIBUTION
m = –1.07ppm
σ = 1.06ppm
RMS Noise
vs Input Differential Voltage
INPUT DIFFERENTIAL VOLTAGE (V)
–2.5
RMS NOISE (ppm OF V
REF
)
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
V
CC
= 5V
V
REF
= 5V
V
INCM
= 2.5V
F
O
= GND
T
A
= 25°C