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LTC2356IMSE-12PBF Datasheet(PDF) 13 Page - Linear Technology |
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LTC2356IMSE-12PBF Datasheet(HTML) 13 Page - Linear Technology |
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13 / 18 page  LTC2356-12/LTC2356-14 2356fa AIN– LTC2356-14 AIN+ C1 47pF TO 1000pF 1 R1 51 C3 1µF C5 0.1µF 5V –5V C4 1µF R5 1k 1.5VCM R3 499 R4 499 R6 1k C2 47pF TO 1000pF R2 51 C6 0.1µF VIN 1.25VP-P MAX 2356 F06a U1 1/2 LT1819 U2 1/2 LT1819 INPUT VOLTAGE (V) 2356 F05 011...111 011...110 011...101 100...000 100...001 100...010 FS – 1LSB –FS FREQUENCY (Hz) 100 0 –20 –40 –60 –80 –100 –120 1k 10k 100k 1M 2356 F04 10M 100M applications inFormation Figure 3. The voltage of the external reference must be higher than the 2.5V output of the internal reference. The recommended range for an external reference is 2.55V to VDD. An external reference at 2.55V will see a DC quiescent load of 0.75mA and as much as 3mA during conversion. INPUT SPAN VERSUS REFERENCE VOLTAGE The differential input range has a bipolar ± VREF/2 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 ±1.25V 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 LTC2356-12/LTC2356-14 have a unique differential sample-and-holdcircuitthatmeasuresinputvoltagesfrom ground to VDD. The ADC will always convert the bipolar 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 4. The only requirement is that both inputs not go below ground or exceed VDD. Integral nonlinearity errors (INL) and dif- ferential 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 5 shows the ideal input/output characteristics for the LTC2356-12/LTC2356-14. 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 = 153µV for the LTC2356-14, and 1LSB = 2.5V/4096 = 610µV for the LTC2356-12. The LTC2356-14 has 1LSB RMS of random white noise. Figure 6a shows the LTC1819 converting a single ended input signal to differential input signals for optimum THD and SFDR performance as shown in the FFT plot (Figure 6b). Figure 4. CMRR vs Frequency Figure 5. LTC2356-12/LTC2356-14 Transfer Characteristic Figure 6a. The LT1819 Driving the LTC2356-14 Differentially |
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