Datasheet

32
LTC2420
Table 6. Typical Performance of the LTC2420 ADC When Used with the
LT1167 Instrumentation Amplifiers in Figure 34’s Differential Digitizing Circuit
V
S
= ±5V V
S
= ±15V
PARAMETER A
V
= 10 A
V
= 100 A
V
= 10 A
V
= 100 TOTAL (UNITS)
Differential Input Voltage Range – 30 to 400 –3 to 40 –30 to 500 –3 to 50 mV
Zero Error –94 –1590 –110 –1470 µV
Maximum Input Current 0.5 nA
Nonlinearity ±4.1 ±4.4 ±4.1 ±3.7 ppm
Noise (Without Averaging) 1.4* 0.19* 1.5* 0.18* µV
RMS
Noise (Averaged 64 Readings) 0.18* 0.02* 0.19* 0.02* µV
RMS
Resolution (with Averaged Readings) 21.4 21.0 21.3 21.1 Bits
Overall Accuracy (Uncalibrated) 18.2 18.1 18.2 19.4 Bits
Common Mode Rejection Ratio ≥120 dB
Common Mode Range 2/–1.5** 2.2/–1.7** 11.5/–11** 11.7/–11.2** V
*Input referred noise for the respective gain. **Typical values based on single lab tested sample of each amplifier.
TYPICAL APPLICATIO S
U
Table 5. Typical Performance of the LTC2420 ADC When Used with the
LT1920 Instrumentation Amplifiers in Figure 34’s Differential Digitizing Circuit
V
S
= ±5V V
S
= ±15V
PARAMETER A
V
= 10 A
V
= 100 A
V
= 10 A
V
= 100 TOTAL (UNITS)
Differential Input Voltage Range – 30 to 400 –3 to 40 –30 to 500 –3 to 50 mV
Zero Error –160 –2650 –213 –2625 µV
Maximum Input Current 2.0 nA
Nonlinearity ±8.2 ±7.4 ±6.5 ±6.1 ppm
Noise (Without Averaging) 1.8* 0.25* 1.5* 0.27* µV
RMS
Noise (Averaged 64 Readings) 0.2* 0.03* 0.19* 0.03* µV
RMS
Resolution (with Averaged Readings) 21 20.6 21.3 20.5 Bits
Overall Accuracy (Uncalibrated) 17.2 17.3 17.5 18.2 Bits
Common Mode Rejection Ratio ≥120 dB
Common Mode Range 2/–1.5** 2.2/–1.7** 11.5/–11** 11.7/–11.2** V
*Input referred noise for the respective gain. **Typical values based on single lab tested sample of each amplifier.