8

LTC2420

APPLICATIO S I FOR ATIO

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

unaveraged total unadjusted error for the LTC2420 oper-

shows the same device operating with a 5V reference and

an output data rate of 7.5 samples/second.

Figure 6. Total Unadjusted Error at

100 Samples/Second (No Averaging)

Figure 7. Total Unadjusted Error at 7.5 Samples/Second

(No Averaging)

REFERENCE VOLTAGE (V)

1.0

128

192

5.0

2420 F05

64

0

2.0

3.0

4.0

1.5

2.5

3.5

4.5

256

96

160

32

224

OUTPUT RATE = 100sps

12 BITS

13 BITS

14 BITS

15 BITS

INPUT VOLTAGE (V)

0

–40

–30

–25

–20

–15

–10

–5

2420 F06

0

5

10

–35

2.5

INPUT VOLTAGE (V)

0

–2

0

2

5

2420 F07

–4

–6

–10

–8

6

4

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.

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.