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AD7886KP Fiches technique(PDF) 6 Page - Analog Devices |
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AD7886KP Fiches technique(HTML) 6 Page - Analog Devices |
6 / 16 page AD7886 –6– REV. B this amplifier typically by 20 MHz which is much greater than the Nyquist limit of the ADC; as a result, it can be used for undersampling applications. The track-and-hold amplifier ac- quires the input signal to 12-bit accuracy in less than 333 ns. The overall throughput time is equal to the conversion time plus the track/ hold amplifier acquisition time, which is 1.333 µs for the AD7886. The operation of the track/hold amplifier is essentially transpar- ent to the user. The track-to-hold transition occurs at the start of conversion on the falling edge of CONVST. The conversion procedure does not start until the rising edge of CONVST. The width of the CONVST pulse low time determines the track-to hold settling time. The track/hold reverts back to the track mode at the end of conversion when BUSY has returned high. + – TO COMPARATORS VIN1 VIN2 0 TO 5V 0 TO 5V ANALOG INPUT RANGE 3.5k 10k 10k 0 TO 10V ANALOG INPUT RANGE + – TO COMPARATORS VIN1 VIN2 0 TO 10V 3.5k 10k 10k +5V ±5V ANALOG INPUT RANGE ±5V + – TO COMPARATORS VIN1 VIN2 3.5k 10k 10k Figure 3. Analog Input Range Configurations ANALOG INPUT RANGES The AD7886 has three user selectable analog input ranges: 0 V to 5 V, 0 V to 10 V and ±5 V. Figure 3 shows how to configure the two analog inputs (VIN1 and VIN2) for these ranges. UNIPOLAR OPERATION Figure 4 shows a typical unipolar circuit for the AD7886. The ideal input/output characteristic is shown in Figure 5. The designed code transitions occur on integer multiples of 1 LSB. The output code is natural binary with 1 LSB = FS/4096. FS is either +5 V or +10 V, depending on how the analog inputs are configured. AD7886* SUM + – AD586 V OUT +V IN GND +V C1 10 µF C2 0.1 µF AD707 VIN1 VIN2** AGND V SS V DD AIN 0 TO 5V OR 0 TO 10V 5V + 5REF + 5V + V REF 3.5V – 5V – *ADDITIONAL PINS OMITTED FOR CLARITY **0 TO 5V RANGE: CONNECT VIN2 TO VIN1 0 TO 10V RANGE: CONNECT VIN2 TO AGND Figure 4. Unipolar Operation 00...000 00...001 00...010 00...011 11...111 11...110 11...101 11...100 123 FS OUTPUT CODE VIN, INPUT VOLTAGE (LSBS) FS – 1LSB 1LSB = 4096 FS Figure 5. Ideal Input/Output Transfer Characteristic for Unipolar Operation |
Numéro de pièce similaire - AD7886KP |
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Description similaire - AD7886KP |
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