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AD7899BR-1 Datasheet(PDF) 9 Page - Analog Devices |
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AD7899BR-1 Datasheet(HTML) 9 Page - Analog Devices |
9 / 16 page REV. A AD7899 –9– AD7899-1 VINA TRACK/HOLD TO ADC REFERENCE CIRCUITRY TO INTERNAL COMPARATOR R4 R1 R2 6k 2.5V REFERENCE R3 GND VINB VREF Figure 2. AD7899-1 Analog Input Structure For the AD7899-1, R1 = 4 k Ω, R2 = 16 kΩ, R3 = 16 kΩ and R4 = 8 k Ω. The resistor input stage is followed by the high input impedance stage of the track/hold amplifier. The designed code transitions take place midway between suc- cessive integer LSB values (i.e., 1/2 LSB, 3/2 LSBs, 5/2 LSBs etc.) LSB size is given by the formula, 1 LSB = FSR/16384. For the ±5 V range, 1 LSB = 10 V/16384 = 610.4 µV. For the ±10 V range, 1 LSB = 20 V/16384 = 1.22 mV. Output coding is two’s complement binary with 1 LSB = FSR/16384. The ideal input/output transfer function for the AD7899-1 is shown in Table I. Table I. Ideal Input/Output Code Table for the AD7899-1 Digital Output Analog Input 1 Code Transition +FSR/2 – 3/2 LSB 2 011 . . . 110 to 011 . . . 111 +FSR/2 – 5/2 LSB 011 . . . 101 to 011 . . . 110 +FSR/2 – 7/2 LSB 011 . . . 100 to 011 . . . 101 GND + 3/2 LSB 000 . . . 001 to 000 . . . 010 GND + 1/2 LSB 000 . . . 000 to 000 . . . 001 GND – 1/2 LSB 111 . . . 111 to 000 . . . 000 GND – 3/2 LSB 111 . . . 110 to 111 . . . 111 –FSR/2 + 5/2 LSB 100 . . . 010 to 100 . . . 011 –FSR/2 + 3/2 LSB 100 . . . 001 to 100 . . . 010 –FSR/2 + 1/2 LSB 100 . . . 000 to 100 . . . 001 NOTES 1FSR is full-scale range and is 20 V for the ±10 V range and 10 V for the ±5 V range, with VREF = 2.5 V. 21 LSB = FSR/16384 = 1.22 mV ( ±10 V – AD7899-1) and 610.4 µV (±5 V – AD7899-1) with VREF = 2.5 V. AD7899-2 Figure 3 shows the analog input section of the AD7899-2. Each input can be configured for 0 V to 5 V operation or 0 V to 2.5 V operation. For 0 V to 5 V operation, the VINB input is tied to GND and the input voltage is applied to the VINA input. For 0 V to 2.5 V operation, the VINA and VINB inputs are tied together and the input voltage is applied to both. The VINA and VINB inputs are symmetrical and fully interchangeable. For the AD7899-2, R1 = 4 k Ω and R2 = 4 kΩ. Once again, the designed code transitions occur on successive integer LSB values. Output coding is straight (natural) binary with 1 LSB = FSR/ 16384 = 2.5 V/16384 = 0.153 mV, and 5 V/16384 = 0.305 mV, for the 0 to 2.5 V and the 0 to 5 V options respectively. Table II shows the ideal input and output transfer function for the AD7899-2. AD7899-2 VINA TRACK/HOLD TO ADC REFERENCE CIRCUITRY TO INTERNAL COMPARATOR R1 6k 2.5V REFERENCE R2 VINB VREF Figure 3. AD7899-2 Analog Input Structure Table II. Ideal Input/Output Code Table for the AD7899-2 Digital Output Analog Input 1 Code Transition +FSR – 3/2 LSB 2 111 . . . 110 to 111 . . . 111 +FSR – 5/2 LSB 111 . . . 101 to 111 . . . 110 +FSR – 7/2 LSB 111 . . . 100 to 111 . . . 101 GND + 5/2 LSB 000 . . . 010 to 000 . . . 011 GND + 3/2 LSB 000 . . . 001 to 000 . . . 010 GND + 1/2 LSB 000 . . . 000 to 000 . . . 001 NOTES 1FSR is Full-Scale Range and is 0 to 2.5 V and 0 to 5 V for AD7899-2 with V REF = 2.5 V. 21 LSB = FSR/16384 and is 0.153 mV (0 to 2.5 V) and 0.305 mV (0 to 5 V) for AD7899-2 with VREF = 2.5 V. |
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