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AD5398BCPZ-REEL7 датащи(PDF) 11 Page - Analog Devices |
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AD5398BCPZ-REEL7 датащи(HTML) 11 Page - Analog Devices |
11 / 16 page AD5398 Rev. A | Page 11 of 16 PD X D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X X X 00 SCL SDA START BY MASTER ACK BY AD5398 11 91 ACK BY AD5398 ACK BY AD5398 STOP BY MASTER FRAME 3 LEAST SIGNIFICANT DATA BYTE FRAME 2 MOST SIGNIFICANT DATA BYTE FRAME 1 SERIAL BUS ADDRESS BYTE 0 1 1 X X R/W 9 Figure 17. Write Operation PD X D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X X X 00 SCL SDA START BY MASTER ACK BY AD5398 11 91 ACK BY AD5398 ACK BY AD5398 STOP BY MASTER FRAME 3 LEAST SIGNIFICANT DATA BYTE FRAME 2 MOST SIGNIFICANT DATA BYTE FRAME 1 SERIAL BUS ADDRESS BYTE 0 1 1 X X R/W 9 Figure 18. Read Operation Table 6. Data Format 1 Serial Data-Words High Byte Low Byte Serial Data Bits SD7 SD6 SD5 SD4 SD3 SD2 SD1 SD0 SD7 SD6 SD5 SD4 SD3 SD2 SD1 SD0 Input Register R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0 Function PD X D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X X X 1 PD = soft power-down; X = unused/don’t care; D9 to D0 = DAC data POWER SUPPLY BYPASSING AND GROUNDING When accuracy is important in an application, it is beneficial to consider power supply and ground return layout on the PCB. The PCB for the AD5398 should have separate analog and digital power supply sections. Where shared AGND and DGND is necessary, the connection of grounds should be made at only one point, as close as possible to the AD5398. Special attention should be paid to the layout of the AGND return path and track between the voice coil motor and ISINK to minimize any series resistance. Figure 19 shows the output current sink of the AD5398 and illustrates the importance of reducing the effective series impedance of AGND, and the track resistance between the motor and ISINK. The voice coil is modeled as inductor LC and resistor RC. The current through the voice coil is effectively a dc current that results in a voltage drop, VC, when the AD5398 is sinking current; the effect of any series inductance is minimal. The maximum voltage drop allowed across RSENSE is 400 mV, and the minimum drain to source voltage of Q1 is 200 mV. This means that the AD5398 output has a compliance voltage of 600 mV. If VDROP falls below 600 mV, the output transistor, Q1, can no longer operate properly and ISINK might not be maintained as a constant. 7 AGND VG Q1 GROUND RESISTANCE GROUND INDUCTANCE 8 ISINK RSENSE 3.3 Ω RG LG VDROP VT VC VBAT RT RC LC TRACE RESISTANCE VOICE COIL ACTUATOR Figure 19. Effect of PCB Trace Resistance and Inductance |
Аналогичный номер детали - AD5398BCPZ-REEL7 |
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Аналогичное описание - AD5398BCPZ-REEL7 |
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