Zakładka z wyszukiwarką danych komponentów |
|
AD7892AR-3 Arkusz danych(PDF) 11 Page - Analog Devices |
|
AD7892AR-3 Arkusz danych(HTML) 11 Page - Analog Devices |
11 / 14 page AD7892 REV. C –11– The designed code transitions occur midway between successive integer LSB values (i.e., 1/2 LSB, 3/2 LSBs, 5/2 LSBs). Output coding is two’s complement binary with 1 LSB = FSR/4096 = 20 V/4096 = 4.88 mV for the ±10 V range and 1 LSB = FSR/ 4096 = 10 V/4096 = 2.44 mV for the ±5 V range. The ideal input/output transfer function for the AD7892-1 is shown in Table I. AD7892-2 The analog input section for the AD7892-2 contains no biasing resistors. The analog input looks directly into the track/hold input stage. The analog input range on the VIN1 input is 0 V to +2.5 V. The VIN2 input can be left unconnected but if it is connected to a potential then that potential must be AGND. The VIN1 input connects directly to the input sampling capacitor of the AD7892-2’s track/hold. The value of this input sampling capacitor is nominally 10 pF. Once again, the designed code transitions occur midway be- tween successive integer LSB values (i.e., 1/2 LSB, 3/2 LSBs, 5/2 LSBs). Output coding is straight (natural) binary with 1 LSB = FSR/4096 = 2.5 V/4096 = 0.61 mV. The ideal input/ output transfer function for the AD7892-2 is shown in Table II. Table I. Ideal Input/Output Code Table for the AD7892-1 Digital Output Analog Input Code Transition +FSR/2 – 3/2 LSB1, 2 (9.99268 or 4.99634)3 011 . . . 110 to 011 . . . 111 +FSR/2 – 5/2 LSBs (9.98779 or 4.99390) 011 . . . 101 to 011 . . . 110 +FSR/2 – 7/2 LSBs (9.98291 or 4.99146) 011 . . . 100 to 011 . . . 101 AGND + 3/2 LSB (0.00732 or 0.00366) 000 . . . 001 to 000 . . . 010 AGND + 1/2 LSB (0.00244 or 0.00122) 000 . . . 000 to 000 . . . 001 AGND – 1/2 LSB (–0.00244 or –0.00122) 111 . . . 111 to 000 . . . 000 AGND – 3/2 LSB (–0.00732 or –0.00366) 111 . . . 110 to 111 . . . 111 –FSR/2 + 5/2 LSB (–9.98779 or – 4.99390) 100 . . . 010 to 100 . . . 011 –FSR/2 + 3/2 LSB (–9.99268 or – 4.99634) 100 . . . 001 to 100 . . . 010 –FSR/2 + 1/2 LSB (–9.99756 or – 4.99878) 100 . . . 000 to 100 . . . 001 NOTES 1FSR is full-scale range and REF IN = +2.5 V, is 20 V for the ±10 V range and 10 V for the ±5 V range. 21 LSB = FSR/4096 = 4.88 mV ( ±10 V range) and 2.44 mV (±5 V range) with REF IN = +2.5 V. 3 ± 10 V range or ±5 V range. Table II. Ideal Input/Output Code Table for the AD7892-2 Digital Output Analog Input Code Transition +FSR – 3/2 LSB 1, 2 (2.499084 V) 111 . . . 110 to 111 . . . 111 +FSR – 5/2 LSBs (2.498474 V) 111 . . . 110 to 111 . . . 110 +FSR – 7/2 LSBs (2.497864 V) 111 . . . 100 to 111 . . . 101 AGND + 5/2 LSB (0.001526 V) 000 . . . 010 to 010 . . . 011 AGND + 3/2 LSB (0.00916 V) 000 . . . 001 to 001 . . . 010 AGND + 1/2 LSB (0.000305 V) 000 . . . 000 to 000 . . . 001 NOTES 1FSR is full-scale range and is 2.5 V with REF IN = +2.5 V. 21 LSB = FSR/4096 = 0.61 mV with REF IN = +2.5 V. AD7892-3 Figure 5 shows the analog input section for the AD7892-3. The analog input range is ±2.5 V on the VIN1 input. The VIN2 input can be left unconnected but if it is connected to a potential then that potential must be AGND. The input resistance on the VIN1 is 1.8 k Ω nominal. As a result, the VIN1 input should be driven from a low impedance source. The resistor attenuator stage is followed by the high input impedance stage of the track/hold amplifier. This resistor attenuator stage allows the input voltage to go to ±7 V without damaging the AD7892-3. The designed code transitions occur midway between succes- sive integer LSB values (i.e., 1/2 LSB, 3/2 LSBs, 5/2 LSBs). Output coding is two’s complement binary with 1 LSB = FSR/ 4096 = 5 V/4096 = 1.22 mV with REF IN = +2.5 V. The ideal input/output transfer function for the AD7892-3 is shown in Table III. +2.5 REFERENCE REF OUT/ REF IN VIN1 VIN2* AGND TO HIGH IMPEDANCE SHA INPUT TO ADC REFERENCE CIRCUITRY 2k 3.25k 3.25k * UNCONNECTED INTERNALLY ON THE AD7892-3 Figure 5. AD7892-3 Analog Input Structure Table III. Ideal Input/Output Code Table for the AD7892-3 Digital Output Analog Input Code Transition +FSR/2 – 3/2 LSB 1, 2 (2.49817) 011 . . . 110 to 011 . . . 111 +FSR/2 – 5/2 LSBs (2.49695) 011 . . . 110 to 011 . . . 110 +FSR/2 – 7/2 LSBs (2.49573) 011 . . . 110 to 011 . . . 101 AGND + 3/2 LSB (0.00183) 000 . . . 001 to 000 . . . 010 AGND + 1/2 LSB (0.00061) 000 . . . 000 to 000 . . . 001 AGND – 1/2 LSB (–0.00061) 111 . . . 111 to 000 . . . 000 AGND – 3/2 LSB (–0.00183) 111 . . . 110 to 111 . . . 111 –FSR/2 + 5/2 LSB (–2.49695) 100 . . . 010 to 100 . . . 011 –FSR/2 + 3/2 LSB (–2.49817) 100 . . . 001 to 100 . . . 010 –FSR/2 + 1/2 LSB (–2.49939) 100 . . . 000 to 100 . . . 001 NOTES 1FSR is full-scale range and is 5 V with REF IN = +2.5 V. 21 LSB = FSR/4096 = 1.22 mV with REF IN = +2.5 V. |
Podobny numer części - AD7892AR-3 |
|
Podobny opis - AD7892AR-3 |
|
|
Link URL |
Polityka prywatności |
ALLDATASHEET.PL |
Czy Alldatasheet okazała się pomocna? [ DONATE ] |
O Alldatasheet | Reklama | Kontakt | Polityka prywatności | Linki | Lista producentów All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |