Electronic Components Datasheet Search |
|
AD9731-PCB Datasheet(PDF) 9 Page - Analog Devices |
|
AD9731-PCB Datasheet(HTML) 9 Page - Analog Devices |
9 / 11 page AD9731 –9– REV. A The REFERENCE IN pin can also be driven directly for wider bandwidth multiplying operation. The analog signal for this mode of operation must have a signal swing in the range of –3.3 V to –4.25 V. This can be implemented by capacitively coupling into REFERENCE IN a signal with a dc bias of –3.3 V (IOUT ≈ 22.5 mA) to –4.25 V (IOUT ≈ 3 mA), as shown in Figure 17, or by dividing REFERENCE IN with a low impedance op amp whose signal swing is limited to the stated range. NOTE: When using an external reference, the external refer- ence voltage must be applied prior to applying –VS. REFERENCE IN AD9731 –VS APPROX –3.8V –VS Figure 17. Wideband Multiplying Circuit Analog Output The switch network provides complementary current outputs IOUT and IOUTB. The design of the AD9731 is based on statisti- cal current source matching, which provides a 10-bit linearity without trim. Current is steered to either IOUT or IOUTB in pro- portion to the digital input word. The sum of the two currents is always equal to the full-scale output current minus 1 LSB. The current can be converted to a voltage by resistive loading as shown in the block diagram. Both IOUT and IOUTB should be equally loaded for best overall performance. The voltage that is developed is the product of the output current and the value of the load resistor. An operational amplifier can also be used to perform the I-to-V conversion of the DAC output. Figure 18 shows an example of a circuit that uses the AD9617, a high speed, current feedback amplifier. The resistor values in Figure 18 provide a 4.096 V swing, centered at ground, at the output of the AD9617 amplifier. AD9617 AD9731 R1 200 10k 1/2 AD708 10k R2 100 RFB 400 IOUT IOUTB CONTROL AMP IN REF OUT RFF 25 RL 25 1/2 AD708 ±2048V VOUT IFS IFS 25 Figure 18. I-to-V Conversion Using a Current Feedback Amplifier EVALUATION BOARD The performance characteristics of the AD9731 make it ideally suited for direct digital synthesis (DDS) and other waveform synthesis applications. The AD9731 evaluation board provides a platform for analyzing performance under optimum layout con- ditions. The AD9731 also provides a reference for high speed circuit board layout techniques. |
Similar Part No. - AD9731-PCB |
|
Similar Description - AD9731-PCB |
|
|
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 |