Datasheet

LTC2440
7
2440fd
TYPICAL PERFORMANCE CHARACTERISTICS
Negative Full-Scale Error
vs Temperature
Positive Full-Scale Error
vs Temperature Offset Error vs V
CC
Offset Error vs Conversion Rate Offset Error vs V
INCM
RMS Noise vs Temperature
Offset Error vs Temperature
INL vs Output Rate
(OSR = 128) External Clock Sweep
10MHz to 20MHz
RMS Noise vs Output Rate
(OSR = 128) External Clock
Sweep 10MHz to 20MHz
TEMPERATURE (°C)
–55
FULL-SCALE ERROR (ppm OF V
REF
)
5
10
15
125
2440 G19
–5
–20
–25 5
35
65 95
20
0
–10
–15
4.5V
5V
5.5V
V
CC
= 4.5V
V
REF
= 4.5V
V
REF
+
= 4.5V
V
REF
–
= GND
V
INCM
= 2.25V
OSR = 32768
f
O
= GND
V
CC
= 5.5V, 5V
V
REF
= 5V
V
REF
+
= 5V
V
REF
–
= GND
V
INCM
= 2.5V
OSR = 32768
f
O
= GND
TEMPERATURE (°C)
–55
FULL-SCALE ERROR (ppm OF V
REF
)
5
10
15
125
2440 G20
–5
–20
–25 5
35
65 95
20
0
–10
–15
4.5V
5V
5.5V
V
CC
= 4.5V
V
REF
= 4.5V
V
REF
+
= 4.5V
V
REF
–
= GND
V
INCM
= 2.25V
OSR = 32768
f
O
= GND
V
CC
= 5.5V, 5V
V
REF
= 5V
V
REF
+
= 5V
V
REF
–
= GND
V
INCM
= 2.5V
OSR = 32768
f
O
= GND
V
CC
(V)
4.5
OFFSET ERROR (ppm OF V
REF
)
0
2.5
5.3
2440 G21
–2.5
–5.0
4.7
4.9
5.1
5.5
5.0
V
REF
= 2.5V
V
REF
+
= 2.5V
V
REF
–
= GND
V
IN
+
= V
IN
–
= GND
OSR = 32768
f
O
= GND
T
A
= 25°C
CONVERSION RATE (Hz)
0
–5.0
OFFSET ERROR (ppm OF V
REF
)
–2.5
0
2.5
5.0
500 1000 1500 2000
2440 G22
2500 3000 3500
V
CC
= 5V
V
REF
= 5V
V
REF
+
= 5V
V
REF
–
= GND
V
IN
+
= V
IN
–
= GND
f
O
= GND
T
A
= 25°C
V
INCM
(V)
0
OFFSET ERROR (ppm OF V
REF
)
0
2.5
4
2440 G23
–2.5
–5.0
1
2
3
5
5.0
V
CC
= 5V
V
REF
= 5V
V
REF
+
= 5V
V
REF
–
= GND
V
IN
+
= V
IN
–
= V
INCM
OSR = 32768
f
O
= GND
T
A
= 25°C
TEMPERATURE (°C)
–55
0.5
RMS NOISE (μV)
1.0
1.5
2.0
2.5
3.5
–25
53565
2440 G24
95 125
3.0
V
CC
= 4.5V
V
REF
= 2.5V
V
REF
+
= 2.5V
V
REF
–
= GND
V
IN
+
= V
IN
–
= GND
OSR = 256
f
O
= GND
V
CC
= 5.5V, 5V
V
REF
= 5V
V
REF
+
= 5V
V
REF
–
= GND
V
IN
+
= V
IN
–
= GND
OSR = 256
f
O
= GND
V
CC
= 5V
V
CC
= 5.5V
V
CC
= 4.5V
TEMPERATURE (°C)
–55
–5.0
OFFSET ERROR (μV)
–2.5
0
2.5
5.0
–25
53565
2440 G25
95 125
V
CC
= 4.5V
V
REF
= 2.5V
V
REF
+
= 2.5V
V
REF
–
= GND
V
IN
+
= V
IN
–
= GND
OSR = 256
f
O
= GND
V
CC
= 5.5V, 5V
V
REF
= 5V
V
REF
+
= 5V
V
REF
–
= GND
V
IN
+
= V
IN
–
= GND
OSR = 256
f
O
= GND
V
CC
= 5V
V
CC
= 5.5V
V
CC
= 4.5V
OUTPUT RATE (Hz)
2000
2500 3000 3500 4000
LINEARITY (BITS)
2440 G26
20
18
16
14
12
10
8
6
4
2
0
EXTERNAL CLOCK 10MHz
(OR INTERNAL OSCILLATOR)
V
REF
= V
CC
= 5V
TEMP = 25°C
SWEEP (V
IN
– V
REF
/2) TO V
REF
/2
EXTERNAL
CLOCK 20MHz
OUTPUT RATE (Hz)
2000
2500 3000 3500 4000
RMS NOISE (μV)
2440 G27
5
4
3
2
1
0
V
REF
= V
CC
= 5V
TEMP = 25°C
V
IN
±V
REF
/2