Datasheet
AD9775
Rev. E | Page 18 of 56
MODE CONTROL (VIA SPI PORT)
Table 10. Mode Control via SPI Port
1
Address Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0x00 SDIO
Bidirectional
0 = Input
1 = I/O
LSB, MSB
First, 0 = MSB
1 = LSB
Software
Reset on
Logic 1
Sleep Mode
Logic 1
Shuts Down
the DAC
Output
Currents
Power-Down
Mode Logic 1
Shuts Down All
Digital and
Analog
Functions
1R/2R Mode
DAC Output
Current Set
by One or
Two External
Resistors
0 = 2R,
1 = 1R
PLL_LOCK
Indicator
0x 01 Filter
Interpolation
Rate (1×, 2×,
4×, 8×)
Filter
Interpolation
Rate (1×, 2×, 4×,
8×)
Modulation
Mode
(None, f
S
/2,
f
S
/4, f
S
/8)
Modulation
Mode
(None, f
S
/2,
f
S
/4, f
S
/8)
0 = No Zero
Stuffing on
Interpolation
Filters, Logic 1
Enables Zero
Stuffing.
1 = Real
Mix Mode
0 = Complex
Mix Mode
0 = e
−jωt
1 = e
+jωt
DATACLK/
PLL_LOCK
2
Select
0 = PLLLOCK
1 = DATACLK
0x 02
0 = Signed
Input Data
1 = Unsigned
0 = Two-Port
Mode
1 = One-Port
Mode
DATACLK
Driver
Strength
DATACLK
Invert
0 = No Invert
1 = Invert
ONEPORTCLK
Invert
0 = No Invert
1 = Invert
IQSEL Invert
0 = No Invert
1 = Invert
Q First
0 = I First
1 = Q First
0x 03 Data Rate
Clock Output
2
PLL Divide
(Prescaler)
Ratio
PLL Divide
(Prescaler)
Ratio
0x 04
0 = PLL OFF
2
1 = PLL ON
0 = Automatic
Charge Pump
Control, 1 =
Programmable
PLL Charge
Pump
Control
PLL Charge
Pump
Control
PLL Charge
Pump Control
0x 05 IDAC Fine Gain Adjustment
0x 06 IDAC Coarse Gain Adjustment
0x 07 IDAC Offset
Adjustment
Bit 9
IDAC Offset
Adjustment
Bit 8
IDAC Offset
Adjustment
Bit 7
IDAC Offset
Adjustment
Bit 6
IDAC Offset
Adjustment
Bit 5
IDAC Offset
Adjustment
Bit 4
IDAC Offset
Adjustment
Bit 3
IDAC Offset
Adjustment
Bit 2
0x 08 IDAC I
OFFSET
Direction
0 = I
OFFSET
on I
OUTA
1 = I
OFFSET
on I
OUTB
IDAC Offset
Adjustment
Bit 1
IDAC Offset
Adjustment
Bit 0
0x 09 QDAC Fine Gain Adjustment
0x 0A QDAC Coarse Gain Adjustment
0x 0B QDAC Offset
Adjustment
Bit 9
QDAC Offset
Adjustment
Bit 8
QDAC Offset
Adjustment
Bit 7
QDAC Offset
Adjustment
Bit 6
QDAC Offset
Adjustment
Bit 5
QDAC Offset
Adjustment
Bit 4
QDAC Offset
Adjustment
Bit 3
QDAC Offset
Adjustment
Bit 2
0x 0C QDAC I
OFFSET
Direction
0 = I
OFFSET
on I
OUTA
1 = I
OFFSET
on I
OUTB
QDAC Offset
Adjustment
Bit 1
QDAC Offset
Adjustment
Bit 0
0x 0D Version Register
1
Default values are shown in bold.
2
See the Two-Port Data Input Mode section.