Datasheet

LTC2412
7
2412f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
OUTPUT CODE (ppm OF V
REF
)
1.6
0.8 0 0.8 1.6
NUMBER OF READINGS (%)
2412 G10
12
10
8
6
4
2
0
10,000 CONSECUTIVE
READINGS
V
CC
= 5V
V
REF
= 2.5V
V
IN
= 0V
REF
+
= 2.5V
REF
= GND
IN
+
= 1.25V
IN
= 1.25V
F
O
= GND
T
A
= 25°C
GAUSSIAN
DISTRIBUTION
m = 0.033ppm
σ = 0.293ppm
OUTPUT CODE (ppm OF V
REF
)
1.6
1.2 0.8 0.4 0 0.4 0.8 1.2 1.6
NUMBER OF READINGS (%)
2410 G11
12
10
8
6
4
2
0
10,000 CONSECUTIVE
READINGS
V
CC
= 5V
V
REF
= 2.5V
V
IN
= 0V
REF
+
= 2.5V
REF
= GND
IN
+
= 1.25V
IN
= 1.25V
F
O
= 460800Hz
T
A
= 25°C
GAUSSIAN
DISTRIBUTION
m = 0.014ppm
σ = 0.292ppm
OUTPUT CODE (ppm OF V
REF
)
5.5
5.1 4.7 4.3 3.9 3.5 3.1 2.7 2.3
NUMBER OF READINGS (%)
2412 G12
12
10
8
6
4
2
0
10,000 CONSECUTIVE
READINGS
V
CC
= 5V
V
REF
= 2.5V
V
IN
= 0V
REF
+
= 2.5V
REF
= GND
IN
+
= 1.25V
IN
= 1.25V
F
O
= 1075200Hz
T
A
= 25°C
GAUSSIAN
DISTRIBUTION
m = 3.852ppm
σ = 0.326ppm
OUTPUT CODE (ppm OF V
REF
)
1.6
1.2 0.8 0.4 0 0.4 0.8 1.2 1.6
NUMBER OF READINGS (%)
2412 G13
12
10
8
6
4
2
0
10,000 CONSECUTIVE
READINGS
V
CC
= 2.7V
V
REF
= 2.5V
V
IN
= 0V
REF
+
= 2.5V
REF
= GND
IN
+
= 1.25V
IN
= 1.25V
F
O
= GND
T
A
= 25°C
GAUSSIAN
DISTRIBUTION
m = 0.079ppm
σ = 0.298ppm
OUTPUT CODE (ppm OF V
REF
)
1.6
1.2 0.8 0.4 0 0.4 0.8 1.2 1.6
NUMBER OF READINGS (%)
2412 G14
12
10
8
6
4
2
0
10,000 CONSECUTIVE
READINGS
V
CC
= 2.7V
V
REF
= 2.5V
V
IN
= 0V
REF
+
= 2.5V
REF
= GND
IN
+
= 1.25V
IN
= 1.25V
F
O
= 460800Hz
T
A
= 25°C
GAUSSIAN
DISTRIBUTION
m = 0.177ppm
σ = 0.297ppm
OUTPUT CODE (ppm OF V
REF
)
–10
8.5 –7 5.5 –4 2.5 1 0.5 2
NUMBER OF READINGS (%)
2412 G15
10
9
8
7
6
5
4
3
2
1
0
10,000 CONSECUTIVE
READINGS
V
CC
= 2.7V
V
REF
= 2.5V
V
IN
= 0V
REF
+
= 2.5V
REF
= GND
IN
+
= 1.25V
IN
= 1.25V
F
O
= 1075200Hz
T
A
= 25°C
GAUSSIAN
DISTRIBUTION
m = 3.714ppm
σ = 1.295ppm
OUTPUT CODE (ppm OF V
REF
)
–0.8
–0.6 –0.4 –0.2 0 0.2 0.4 0.6 0.8
NUMBER OF READINGS (%)
2412 G16
12
10
8
6
4
2
0
ADC CONSECUTIVE
READINGS
V
CC
= 5V
V
REF
= 5V
V
IN
= 0V
REF
+
= 5V
REF
= GND
IN
+
= 2.5V
IN
= 2.5V
F
O
= GND
T
A
= 25°C
GAUSSIAN DISTRIBUTION
m = 0.101837ppm
σ = 0.154515ppm
TIME (HOURS)
0
5 10 15 20 25 30 35 40 45 50 55 60
ADC READING (ppm OF V
REF
)
2412 G17
1.0
0.8
0.6
0.4
0.2
0
0.2
0.4
0.6
0.8
1.0
V
CC
= 5V
V
REF
= 5V
V
IN
= 0V
F
O
= GND
T
A
= 25°C
REF
+
= 5V
REF
= GND
IN
+
= 2.5V
IN
= 2.5V
INPUT DIFFERENTIAL VOLTAGE (V)
2.5 2 1.5 1 0.5 0 0.5 1 1.5 2 2.5
RMS NOISE (ppm OF V
REF
)
2412 G18
0.5
0.4
0.3
0.2
0.1
0
V
CC
= 5V
V
REF
= 5V
REF
+
= 5V
REF
= GND
V
INCM
= 2.5V
F
O
= GND
T
A
= 25°C
Noise Histogram (Output Rate =
52.5Hz, V
CC
= 5V, V
REF
= 2.5V)
Noise Histogram (Output Rate =
22.5Hz, V
CC
= 5V, V
REF
= 2.5V)
Noise Histogram (Output Rate =
7.5Hz, V
CC
= 5V, V
REF
= 2.5V)
Noise Histogram (Output Rate =
52.5Hz, V
CC
= 2.7V, V
REF
= 2.5V)
Noise Histogram (Output Rate =
22.5Hz, V
CC
= 2.7V, V
REF
= 2.5V)
Noise Histogram (Output Rate =
7.5Hz, V
CC
= 2.7V, V
REF
= 2.5V)
RMS Noise
vs Input Differential Voltage
Consecutive ADC Readings
vs Time
Long-Term Noise Histogram
(Time = 60 Hrs, V
CC
= 5V,
V
REF
= 5V)