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AD9952 Arkusz danych(PDF) 7 Page - Analog Devices |
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AD9952 Arkusz danych(HTML) 7 Page - Analog Devices |
7 / 28 page AD9952 Rev. B | Page 7 of 28 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 3 4 8 9 1 36 35 34 33 32 31 30 29 28 7 6 2 5 10 11 12 25 26 27 37 41 42 43 44 45 46 47 48 AGND AGND AVDD AVDD AVDD COMP_OUT COMP_IN COMP_IN DGND DVDD PWRDWNCTL RESET I/O UPDATE DVDD DGND AVDD AGND AVDD AGND REFCLK REFCLK CRYSTAL OUT CLKMODESELECT LOOP_FILTER AD9952 TOP VIEW (Not to Scale) 40 39 38 13 14 15 16 17 18 19 20 21 22 23 24 Figure 2. Pin Configuration Note that the exposed paddle on the bottom of the package is a ground connection for the DAC and must be attached to AGND in any board layout. Note that Pin 43, DVDD_I/O, can be powered to 1.8 V or 3.3 V; however, the DVDD pins (Pin 2 and Pin 34) can only be powered to 1.8 V. Table 3. 48-Lead TQFP/EP Pin No. Mnemonic I/O Description 1 I/O UPDATE I The rising edge transfers the contents of the internal buffer memory to the I/O registers. This pin must be set up and held around the SYNC_CLK output signal. 2, 34 DVDD I Digital Power Supply Pins (1.8 V). 3, 33, 42, 47, 48 DGND I Digital Power Ground Pins. 4, 6, 13, 16, 18, 19, 25, 27, 29 AVDD I Analog Power Supply Pins (1.8 V). 5, 7, 14, 15, 17, 22, 26, 32 AGND I Analog Power Ground Pins. 8 REFCLK I Complementary Reference Clock/Oscillator Input. When the REFCLK port is operated in single- ended mode, REFCLK should be decoupled to AVDD with a 0.1 µF capacitor. 9 REFCLK I Reference Clock/Oscillator Input. See the Clock Input section for details on the oscillator/REFCLK operation. 10 CRYSTAL OUT O Output of the Oscillator Section. 11 CLKMODESELECT I Control Pin for the Oscillator Section. When high, the oscillator section is enabled. When low, the oscillator section is bypassed. 12 LOOP_FILTER I This pin provides the connection for the external zero compensation network of the REFCLK multiplier’s PLL loop filter. The network consists of a 1 k Ω resistor in series with a 0.1 µF capacitor tied to AVDD. 20 IOUT O Complementary DAC Output. Should be biased through a resistor to AVDD, not AGND. 21 IOUT O DAC Output. Should be biased through a resistor to AVDD, not AGND. |
Podobny numer części - AD9952_15 |
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Podobny opis - AD9952_15 |
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