Moteur de recherche de fiches techniques de composants électroniques |
|
AD7541AKRZ Fiches technique(PDF) 5 Page - Analog Devices |
|
AD7541AKRZ Fiches technique(HTML) 5 Page - Analog Devices |
5 / 8 page AD7541A –5– REV. B BIPOLAR OPERATION (4-QUADRANT MULTIPLICATION) Figure 5 and Table III illustrate the circuitry and code relation- ship for bipolar operation. With a dc reference (positive or nega- tive polarity) the circuit provides offset binary operation. With an ac reference the circuit provides full 4-quadrant multiplication. With the DAC loaded to 1000 0000 0000, adjust R1 for VOUT = 0 V (alternatively, one can omit R1 and R2 and adjust the ratio of R3 to R4 for VOUT = 0 V). Full-scale trimming can be accomplished by adjusting the amplitude of VREF or by vary- ing the value of R5. As in unipolar operation, A1 must be chosen for low VOS and low IB. R3, R4 and R5 must be selected for matching and track- ing. Mismatch of 2R3 to R4 causes both offset and full-scale error. Mismatch of R5 to R4 or 2R3 causes full-scale error. C1 phase compensation (10 pF to 50 pF) may be required for sta- bility, depending on amplifier used. AD7541A A1 3 R2 * VDD 16 17 18 1 2 VDD RFB VREF PINS 4–15 GND OUT1 OUT2 R1 * VIN BIT 1 – BIT 12 DIGITAL GROUND ANALOG COMMON C1 33pF AD544L VOUT AD544J A2 R4 20k Ω R5 20k Ω R3 10k Ω R6 5k Ω 10% *FOR VALUES OF R1 AND R2 SEE TABLE 1. Figure 5. Bipolar Operation (4-Quadrant Multiplication) Table III. Bipolar Code Table for Offset Binary Circuit of Figure 5 Binary Number in DAC MSB LSB Analog Output, VOUT 1 1 1 1 1 1 1 1 1 1 1 1 +VIN 2047 2048 1 0 0 0 0 0 0 0 0 0 0 1 +VIN 1 2048 1 0 0 0 0 0 0 0 0 0 0 0 0 Volts 0 1 1 1 1 1 1 1 1 1 1 1 –VIN 1 2048 0 0 0 0 0 0 0 0 0 0 0 0 –VIN 2048 2048 Figure 6 and Table IV show an alternative method of achieving bipolar output. The circuit operates with sign plus magnitude code and has the advantage of giving 12-bit resolution in each quadrant, compared with 11-bit resolution per quadrant for the circuit of Figure 5. The AD7592 is a fully protected CMOS changeover switch with data latches. R4 and R5 should match each other to 0.01% to maintain the accuracy of the D/A con- verter. Mismatch between R4 and R5 introduces a gain error. A2 AD7541A A1 3 R2 * VDD 16 17 18 1 2 VDD RFB VREF PINS 4–15 GND OUT1 OUT2 R1 * VIN BIT 1 – BIT 12 DIGITAL GROUND ANALOG COMMON C1 33pF AD544L VOUT AD544J R5 20k Ω *FOR VALUES OF R1 AND R2 SEE TABLE 1. R4 20k Ω R3 10k Ω 10% 1/2 AD7592JN SIGN BIT Figure 6. 12-Bit Plus Sign Magnitude Operation Table IV. 12-Bit Plus Sign Magnitude Code Table for Circuit of Figure 6 Sign Binary Number in DAC Bit MSB LSB Analog Output, VOUT 0 1 1 1 1 1 1 1 1 1 1 1 1 +VIN × 4095 4096 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Volts 1 0 0 0 0 0 0 0 0 0 0 0 0 0 Volts 1 1 1 1 1 1 1 1 1 1 1 1 1 –VIN × 4095 4096 Note: Sign bit of “0” connects R3 to GND. |
Numéro de pièce similaire - AD7541AKRZ |
|
Description similaire - AD7541AKRZ |
|
|
Lien URL |
Politique de confidentialité |
ALLDATASHEET.FR |
ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants 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 |