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AD9806KST Arkusz danych(PDF) 11 Page - Analog Devices |
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AD9806KST Arkusz danych(HTML) 11 Page - Analog Devices |
11 / 12 page REV. 0 AD9806 –11– APPLICATION INFORMATION Grounding and Decoupling Recommendations As shown in Figure 10, a single ground plane is recommended for the AD9806. This ground plane should be as continuous as possible, particularly around Pins 25 through 37. This will ensure that all analog decoupling capacitors provide the lowest possible impedance path between the power and bypass pins and their respective ground pins. All decoupling capacitors should be located as close as possible to the package pins. A single clean power supply is recommended for the AD9806, but a separate digital driver supply may be used for DRVDD (Pin 12). DRVDD should always be decoupled to DRVSS (Pin 13), which should be connected to the analog ground plane. The advantages of using a separate digital driver supply include using a lower volt- age (2.7 V) to match levels with a 2.7 V ASIC, reducing digital power dissipation, and reducing potential noise coupling. Using the AD9806 in AD9803 Sockets The AD9806 may be easily used in existing AD9803 designs without any circuit modifications. Most of the pin assignments are the same for both ICs. Table I outlines the differences. The circuit of Figure 10 shows the necessary connections for the AD9806 when used in an existing AD9803 socket. If the two auxiliary DACs are not used, then Pins 39 and 40 (DAC1 and DAC2) may be grounded. If the AUX or ADC modes are needed, then the input signal should be connected to either AUXIN or ADCIN through a 0.1 µF capacitor, in the same way that CCDIN is used with the input signal. Table I. AD9806/AD9803 Pin Differences Pin No. AD9803 AD9806 Circuit Connection 1 NC NC Ground 15 ACLP NC Ground 24 NC NC Ground 25 CCDBYP2 CLPOUT Decoupled with 0.1 µF to Ground 27 PIN NC Shorted to Pin 26 28 CCDBYP2 CLPREF Decoupled with 0.1 µF to Ground 29 PGABYP1 NC Decoupled with 0.1 µF to Ground 30 PGABYP2 NC Shorted to Pin 29 35 AUXCONT AUXMID Ground, or decoupled with 0.1 µF to Ground 38 VTRBYP NC Decoupled with 0.1 µF to Ground Using the AD9806 in New Designs Figure 11 shows the recommended circuit for using the AD9806 in new designs. Three external decoupling capacitors have been removed from the circuit shown in Figure 9, one from Pin 29, one from Pin 38, and one from between Pins 47 and 48. Note that the decoupling capacitors for Pins 47 (VRB) and 48 (VRT) must be increased to 1.0 µF when used in this configuration. 0.1 F 0.1 F 0.1 F 0.1 F 0.1 F CCD SIGNAL INPUT VDD 0.1 F DIGITAL OUTPUT DATA 48 47 46 45 44 39 38 37 43 42 41 40 1 2 3 4 5 6 7 8 9 10 11 12 NC D0 (LSB) D1 D2 D3 D4 D5 D6 D7 D8 D9 (MSB) DRVDD AD9806 13 14 15 16 17 18 19 20 21 22 23 24 36 35 34 33 32 31 30 29 28 27 26 25 ADCIN AUXMID AUXIN ACVDD CLPBYP ACVSS NC NC CLPREF NC DIN CLPOUT NC = NO CONNECT 0.1 F VDD VDD 0.1 F CLPDM SHD SHP CLPOB PBLK ADCCLK 0.1 F 0.1 F VOUT1 VOUT2 SDATA SCK SL 0.1 F 0.1 F 1.0 F 0.1 F VDD Figure 10. CCD-Mode Circuit Configuration Used in AD9803 Socket |
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