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LTC1403ACMSE Datasheet(PDF) 11 Page - Linear Technology |
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LTC1403ACMSE Datasheet(HTML) 11 Page - Linear Technology |
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11 / 20 page  11 LTC1403/LTC1403A 1403af INPUT SPAN VERSUS REFERENCE VOLTAGE The differential input range has a unipolar voltage span that equals the difference between the voltage at the reference buffer output VREF at Pin 3, and the voltage at the ground (Exposed Pad Ground). The differential input range of the ADC is 0V to 2.5V when using the internal reference. The internal ADC is referenced to these two nodes. This relationship also holds true with an external reference. DIFFERENTIAL INPUTS The LTC1403/LTC1403A has a unique differential sample- and-hold circuit that allows inputs from ground to VDD. The ADC will always convert the unipolar difference of AIN+ – AIN–, independent of the common mode voltage at the inputs. The common mode rejection holds up at extremely high frequencies, see Figure 3. The only require- ment is that both inputs not go below ground or exceed VDD. Integral nonlinearity errors (INL) and differential nonlinearity errors (DNL) are largely independent of the common mode voltage. However, the offset error will vary. The change in offset error is typically less than 0.1% of the common mode voltage. Figure 4 shows the ideal input/output characteristics for the LTC1403/LTC1403A. The code transitions occur mid- way between successive integer LSB values (i.e., 0.5LSB, 1.5LSB, 2.5LSB, FS – 1.5LSB). The output code is natural binary with 1LSB = 2.5V/16384 = 153 µVfortheLTC1403A, and 1LSB = 2.5V/4096 = 610 µV for the LTC1403. The LTC1403A has 1LSB RMS of random white noise. Figure 3 Figure 4 APPLICATIO S I FOR ATIO LTC1403/LTC1403A Transfer Characteristic CMRR vs Frequency FREQUENCY (Hz) 100 0 –20 –40 –60 –80 –100 –120 1k 10k 100k 1M 1403A F03 10M 100M INPUT VOLTAGE (V) 1403A F05 111...111 111...110 111...101 000...000 000...001 000...010 FS – 1LSB 0 |
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