LTC2412 Linear Technology, LTC2412 Datasheet - Page 7

• Manufacturer Part Number: LTC2412
• Description: 2-Channel Differential Input 24-Bit No Latency DS ADC
• Manufacturer: Linear Technology

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