LTC2420CS8 datasheet(27/36 Pages) LINER

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LTC2420

Figure 31. Total Unadjusted Error at

100 Samples/Second (No Averaging)

Figure 32. Total Unadjusted Error at

7.5 Samples/Second (No Averaging)

Figure 30. Total Error vs VREF (Output Rate = 100sps)

APPLICATIO S I FOR ATIO

REFERENCE VOLTAGE (V)

1.0

128

192

5.0

2420 F30

2.0

3.0

4.0

1.5

2.5

3.5

4.5

256

160

224

OUTPUT RATE = 100sps

12 BITS

13 BITS

14 BITS

15 BITS

INPUT VOLTAGE (V)

–40

–30

–25

–20

–15

–10

–5

2420 F31

–35

2.5

VCC = 5V

VREF = 2.5V

INPUT VOLTAGE (V)

–2

2420 F32

–4

–6

–10

–8

VCC = 5V

VREF = 5V

After acquiring 100 samples/second data the FO pin may

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.

As shown in Figure 33, the LTC2420 can capture transient

data with 90dB of dynamic range (with a 300mVP-P input

signal at 2Hz). The exceptional DC performance of the

LTC2420 enables signals to be digitized independent of a

large DC offset. Figures 34a and 34b show the dynamic

performance with a 15Hz signal superimposed on a 2V DC

level. The same signal with no DC level is shown in Figures

34c and 34d.

LTC2420CS8 Datasheet(PDF) 27 Page - Linear Technology

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