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AD9945 Datasheet(PDF) 13 Page - Analog Devices |
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AD9945 Datasheet(HTML) 13 Page - Analog Devices |
13 / 14 page AD9945 –13– 24 REFB 23 REFT 22 CCDIN 21 AVSS D2 1 D3 2 D4 3 20 AVDD 19 SHD 18 SHP 17 CLPOB D5 4 D6 5 D7 6 D8 7 D9 8 DATA OUTPUTS 12 3V DRIVER SUPPLY 3V ANALOG SUPPLY 5 CLOCK INPUTS 3 SERIAL INTERFACE 3V ANALOG SUPPLY CCDIN PIN 1 IDENTIFIER AD9945 (Not to Scale) TOP VIEW 1.0 F 0.1 F 0.1 F 0.1 F 0.1 F D0 D1 NC = NO CONNECT 1.0 F NOTE THE EXPOSED PAD ON THE BOTTOM OF THE AD9945 SHOULD BE SOLDERED TO THE GND PLANE OF THE PRINTED CIRCUIT BOARD Figure 11. Recommended Circuit Configuration for CCD Mode REV. C Internal Power-On Reset Circuitry After power-on, the AD9945 will automatically reset all internal registers and perform internal calibration procedures. This takes approximately 1 ms to complete. During this time, normal clock signals and serial write operations may occur. However, serial register writes will be ignored until the internal reset operation is completed. Required Start-Up Write During power-up of the AD9945, 0x838 must be written into Register 0xD for proper start-up operation. Grounding and Decoupling Recommendations As shown in Figure 11, a single ground plane is recommended for the AD9945. This ground plane should be as continuous as possible. 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 AD9945, but a separate digital driver supply may be used for DRVDD (Pin 11). DRVDD should always be decoupled to DRVSS (Pin 12), which should be connected to the analog ground plane. If the digital outputs (Pins 1 to 10, 31, and 32) must drive a load larger than 20 pF, buffering is recommended to reduce digital code transition noise. Alternatively, placing series resistors close to the digital output pins may also help reduce noise. |
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