Electronic Components Datasheet Search |
|
AD7537KP Datasheet(PDF) 5 Page - Analog Devices |
|
AD7537KP Datasheet(HTML) 5 Page - Analog Devices |
5 / 8 page AD7537 REV. 0 –5– UNIPOLAR BINARY OPERATION (2-QUADRANT MULTIPLICATION) Figure 4 shows the circuit diagram for unipolar binary opera- tion. With an ac input, the circuit performs 2-quadrant multipli- cation. The code table for Figure 4 is given in Table II. Operational amplifiers A1 and A2 can be in a single package (AD644, AD712) or separate packages (AD544, AD711, AD OP27). Capacitors C1 and C2 provide phase compensation to help prevent overshoot and ringing when high-speed op amps are used. For zero offset adjustment, the appropriate DAC register is loaded with all 0s and amplifier offset adjusted so that VOUTA or VOUTB is 0 V. Full-scale trimming is accomplished by loading the DAC register with all 1s and adjusting R1 (R3) so that VOUTA (VOUTB) = –VIN (4095/4096). For high temperature op- eration, resistors and potentiometers should have a low Tem- perature Coefficient. In many applications, because of the excellent Gain T.C. and Gain Error specifications of the AD7537, Gain Error trimming is not necessary. In fixed refer- ence applications, full scale can also be adjusted by omitting R1, R2, R3, R4 and trimming the reference voltage magnitude. Figure 4. AD7537 Unipolar Binary Operation Table II. Unipolar Binary Code Table for Circuit of Figure 4 Binary Number in DAC Register Analog Output, MSB LSB VOUTA or VOUTB 1111 1111 1111 −V IN 4095 4096 1000 0000 0000 −V IN 2048 4096 =− 1 2 V IN 0000 0000 0001 −V IN 1 4096 0000 0000 0000 0 V BIPOLAR OPERATION (4-QUADRANT MULTIPLICATION) The recommended circuit diagram for bipolar operation is shown in Figure 5. Offset binary coding is used. With the appropriate DAC register loaded to 1000 0000 0000, adjust R1 (R3) so that VOUTA (VOUTB) = 0 V. Alternatively, R1, R2 (R3, R4) may be omitted and the ratios of R6, R7 (R9, 10) varied for VOUTA (VOUTB) = 0 V. Full-scale trimming can be ac- complished by adjusting the amplitude of VIN or by varying the value of R5 (R8). If R1, R2 (R3, R4) are not used, then resistors R5, R6, R7 (R8, R9, R10) should be ratio matched to 0.01% to ensure gain error performance to the data sheet specification. When operating over a wide temperature range, it is important that the resistors be of the same type so that their temperature coefficients match. The code table for Figure 5 is given in Table III. Figure 5. Bipolar Operation (Offset Binary Coding) Table III. Bipolar Code Table for Offset Binary Circuit of Figure 5 Binary Number in DAC Register Analog Output, MSB LSB VOUTA or VOUTB 1111 1111 1111 +V IN 2047 2048 1000 0000 0001 +V IN 1 2048 1000 0000 0000 0 V 0111 1111 1111 −V IN 1 2048 0000 0000 0000 −V IN 2048 2048 =−V IN Applications– |
Similar Part No. - AD7537KP |
|
Similar Description - AD7537KP |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |