LTC2420I LINER [Linear Technology], LTC2420I Datasheet - Page 8

• Manufacturer Part Number: LTC2420I
• Description: 20-Bit uPower No Latency ADC in SO-8
• Manufacturer: LINER [Linear Technology]

APPLICATIO S I FOR ATIO
LTC2420
output data rate (ODR) and the frequency applied to the F
pin (F
For output data rates up to 50 samples/second, the total
unadjusted error (TUE) is better than 16 bits, and better
than 12 bits at 100 samples/second. As shown in Figure 5,
for output data rates of 100 samples/second, the TUE is
better than 15 bits for V
unaveraged total unadjusted error for the LTC2420 oper-
ating at 100 samples/second with V
shows the same device operating with a 5V reference and
an output data rate of 7.5 samples/second.
8
O
Figure 5. Total Error vs V
) is:
ODR = F
256
224
192
160
128
96
64
32
0
1.0
OUTPUT RATE = 100sps
1.5
O
/20480
U
2.0
REFERENCE VOLTAGE (V)
REF
2.5
U
below 2.5V. Figure 6 shows an
3.0
REF
3.5
(Output Rate = 100sps)
Figure 7. Total Unadjusted Error at 7.5 Samples/Second
(No Averaging)
4.0
12 BITS
13 BITS
14 BITS
15 BITS
W
REF
4.5
2420 F05
= 2.5V. Figure 7
–10
–2
–4
–6
–8
5.0
6
4
2
0
0
U
INPUT VOLTAGE (V)
O
At 100 samples/second, the LTC2420 can be used to
capture transient data. This is useful for monitoring set-
tling or auto gain ranging in a system. The LTC2420 can
monitor signals at an output rate of 100 samples/second.
After acquiring 100 samples/second data the F
be driven LOW enabling 60Hz rejection to 110dB and the
highest possible DC accuracy. The no latency architecture
of the LTC2420 allows consecutive readings (one at 100
samples/second the next at 7.5 samples/second) without
interaction between the two readings.
V
V
CC
REF
= 5V
2420 F07
= 5V
–20
–40
–10
–15
–25
–30
–35
10
–5
0
5
Figure 6. Total Unadjusted Error at
100 Samples/Second (No Averaging)
5
0
INPUT VOLTAGE (V)
V
V
CC
REF
= 5V
= 2.5V
2420 F06
2.5
O
pin may