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AD9777 数据表(PDF) 7 Page - Analog Devices |
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AD9777 数据表(HTML) 7 Page - Analog Devices |
7 / 48 page REV. 0 AD9777 –7– PIN FUNCTION DESCRIPTIONS Pin Number Mnemonic Description 1, 3 CLKVDD Clock Supply Voltage 2 LPF PLL Loop Filter 4, 7 CLKGND Clock Supply Common 5 CLK+ Differential Clock Input 6 CLK– Differential Clock Input 8 DATACLK/PLL_LOCK With the PLL enabled, this pin indicates the state of the PLL. A read of a Logic “1” indicates the PLL is in the locked state. Logic “0” indicates the PLL has not achieved lock. This pin may also be programmed to act as either an input or output (Address 02h, Bit 3) DATACLK signal running at the input data rate. 9, 17, 25, 35, 44, 52 DGND Digital Common 10, 18, 26, 36, 43, 51 DVDD Digital Supply Voltage 11–16, 19–24, 27–30 P1B15 (MSB) to P1B0 (LSB) Port “1” Data Inputs 31 IQSEL/P2B15 (MSB) In “1” port mode, IQSEL = 1 followed by a rising edge of the differential input clock will latch the data into the I channel input register. IQSEL = 0 will latch the data into the Q channel input register. In “2” port mode, this pin becomes the port “2” MSB. 32 ONEPORTCLK/P2B14 With the PLL disabled and the AD9777 in “1” port mode, this pin becomes a clock output that runs at twice the input data rate of the I and Q channels. This allows the AD9777 to accept and demux interleaved I and Q data to the I and Q input registers. 33, 34, 37–42, 45–50 P2B13 to P2B0 (LSB) Port “2” Data Inputs 53 SPI_SDO In the case where SDIO is an input, SDO acts as an output. When SDIO becomes an output, SDO enters a High-Z state. 54 SPI_SDIO Bidirectional Data Pin. Data direction is controlled by Bit 7 of Register Address 00h. The default setting for this bit is “0,” which sets SDIO as an input. 55 SPI_CLK Data input to the SPI port is registered on the rising edge of SPI_CLK. Data output on the SPI port is registered on the falling edge. 56 SPI_CSB Chip Select/SPI Data Synchronization. On momentary logic high, resets SPI port logic and initializes instruction cycle. 57 RESET Logic “1” resets all of the SPI port registers, including Address 00h, to their default values. A software reset can also be done by writing a Logic “1” to SPI Register 00h, Bit 5. However, the software reset has no effect on the bits in Address 00h. 58 REFIO Reference Output, 1.2 V Nominal 59 FSADJ2 Full-Scale Current Adjust, Q Channel 60 FSADJ1 Full-Scale Current Adjust, I Channel 61, 63, 65, 76, 78, 80 AVDD Analog Supply Voltage 62, 64, 66, 67, 70, 71, AGND Analog Common 74, 75, 77, 79 68, 69 IOUTA2, IOUTB2 Differential DAC Current Outputs, Q Channel 72, 73 IOUTA1, IOUTB1 Differential DAC Current Outputs, I Channel |
类似零件编号 - AD9777 |
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类似说明 - AD9777 |
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