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LTC2355-14 Datasheet(PDF) 11 Page - Linear Technology |
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LTC2355-14 Datasheet(HTML) 11 Page - Linear Technology |
11 / 16 page 11 LTC2355-12/LTC2355-14 2355f INPUT SPAN VERSUS REFERENCE VOLTAGE The differential input range has a 0V to VREF unipolar voltage span that equals the difference between the volt- age at the reference buffer output VREF at Pin 3, and the voltage at the ground (Exposed Pad Ground). The differ- ential 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 LTC2355-12/LTC2355-14 has a unique differential sample-and-hold circuit that measures input voltages 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 requirement 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 LTC2355-12/LTC2355-14. The code transitions occur midway between successive integer LSB values (i.e., 0.5LSB, 1.5LSB, 2.5LSB, FS – 1.5LSB). The output code is straight binary with 1LSB = 2.5V/16384 = 153 µV for the LTC2355-14, and 1LSB = 2.5V/4096 = 610 µV for the LTC2355-12. The LTC2355-14 has 1LSB RMS of random white noise. Figure 3. CMRR vs Frequency Figure 4. LTC2355-12/LTC2355-14 Transfer Characteristic APPLICATIO S I FOR ATIO FREQUENCY (Hz) 100 0 –20 –40 –60 –80 –100 –120 1k 10k 100k 1M 2355 F03 10M 100M INPUT VOLTAGE (V) 2355 F05 111...111 111...110 111...101 000...000 000...001 000...010 FS – 1LSB 0 |
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