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AD9775 Datasheet(PDF) 11 Page - Analog Devices

Part # AD9775
Description  14-Bit, 160 MSPS, 2/4/8 Interpolating
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD9775 Datasheet(HTML) 11 Page - Analog Devices

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AD9775
Rev. E | Page 11 of 56
Table 9. Pin Function Descriptions
Pin No.
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 to 16, 19 to 24, 27, 28
P1B13 (MSB) to P1B0
(LSB)
Port 1 Data Inputs.
29, 30, 49, 50
NC
No Connect.
31
IQSEL/P2B13 (MSB)
In one-port mode, IQSEL = 1 followed by a rising edge of the differential input
clock latches the data into the I channel input register. IQSEL = 0 latches the data
into the Q channel input register. In two-port mode, this pin becomes the Port 2
MSB.
32
ONEPORTCLK/P2B12
With the PLL disabled and the AD9775 in one-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 AD9775 to accept and demux interleaved I and Q data to the I and Q
input registers.
33, 34, 37 to 42, 45 to 48
P2B11 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. This pin can also be used as an output for the
data rate clock. For more information, see the Two-Port Data Input Mode section.
54
SPI_SDIO
Bidirectional Data Pin. Data direction is controlled by Bit 7 of Register Address 0x00.
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 0x00, 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 bit in Address 0x00.
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,
74, 75, 77, 79
AGND
Analog Common.
68, 69
IOUTB2, IOUTA2
Differential DAC Current Outputs, Q Channel.
72, 73
IOUTB1, IOUTA1
Differential DAC Current Outputs, I Channel.


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