AD9773 Analog Devices, AD9773 Datasheet - Page 11

• Manufacturer Part Number: AD9773
• Manufacturer: Analog Devices

Specifications of AD9773

• Resolution (bits): 12bit
• Dac Update Rate: 400MSPS
• Dac Settling Time: 11ns
• Max Pos Supply (v): +3.5V
• Single-supply: Yes
• Dac Type: Current Out
• Dac Input Format: Par

Table 8. Pin Function Descriptions
Pin No.
1, 3
2
4, 7
5
6
8
9, 17, 25,
35, 44, 52
10, 18, 26,
36, 43, 51
11 to 16,
19 to 24,
27 to 30,
47 to 50
31
32
33, 34, 37 to
42, 45, 46
53
54
55
56
57
58
59
60
61, 63, 65,
76, 78, 80
62, 64, 66,
67, 70, 71,
74, 75, 77,
79
68, 69
72, 73
Mnemonic
CLKVDD
LPF
CLKGND
CLK+
CLK−
DATACLK/PLL_LOCK
DGND
DVDD
P1B11 (MSB) to P1B0 (LSB)
NC
IQSEL/P2B11 (MSB)
ONEPORTCLK/P2B10
P2B9 to P2B0 (LSB)
SPI_SDO
SPI_SDIO
SPI_CLK
SPI_CSB
RESET
REFIO
FSADJ2
FSADJ1
AVDD
AGND
I
I
OUTB2
OUTB1
, I
, I
OUTA2
OUTA1
Description
Clock Supply Voltage.
PLL Loop Filter.
Clock Supply Common.
Differential Clock Input.
Differential Clock Input.
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 can also be
programmed to act as either an input or output (Address 02h, Bit 3) DATACLK signal running
at the input data rate.
Digital Common.
Digital Supply Voltage.
Port 1 Data Inputs.
No Connect.
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.
With the PLL disabled and the AD9773 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 AD9773 to
accept and demux interleaved I and Q data to the I and Q input registers.
Port 2 Data Inputs.
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.
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.
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.
Chip Select/SPI Data Synchronization. On momentary logic high, resets SPI port logic and
initializes instruction cycle.
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.
Reference Output, 1.2 V Nominal.
Full-Scale Current Adjust, Q Channel.
Full-Scale Current Adjust, I Channel.
Analog Supply Voltage.
Analog Common.
Differential DAC Current Outputs, Q Channel.
Differential DAC Current Outputs, I Channel.
Rev. D | Page 11 of 60
AD9773