參數(shù)資料
型號： AD9776A-DPG2-EBZ
廠商： Analog Devices Inc
文件頁數(shù)： 25/56頁
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD9776A
標(biāo)準(zhǔn)包裝： 1
系列： *
DAC 的數(shù)量： 2
位數(shù)： 12
采樣率（每秒）： 1G
數(shù)據(jù)接口： 并聯(lián)
DAC 型： 電流
工作溫度： -40°C ~ 85°C
已供物品： *
已用 IC / 零件： AD9776A
AD9776A/AD9778A/AD9779A
Rev. B | Page 31 of 56
Register
Address
Bits
Register Name
Parameter
Function
Default
PLL Control
0x08
7:2
PLL Band Select[5:0]
This sets the operating frequency range of the
VCO. For details (see Table 23).
111001
0x08
1:0
PLL VCO Drive[1:0]
Controls the signal strength of the VCO output. Set
to 11 for optimal performance.
11
0x09
7
PLL enable
0: PLL off, DAC sample clock is sourced directly by
the REFCLK input.
1: PLL on, DAC clock synthesized internally from
REFCLK input via PLL clock multiplier.
0
0x09
6:5
PLL VCO Divide Ratio[1:0]
Sets the value of the VCO output divider, which
determines the ratio of the VCO output frequency
to the DAC sample clock frequency, fVCO/fDACCLK.
00: fVCO/fDACCLK = 1.
01: fVCO/fDACCLK = 2.
10: fVCO/fDACCLK = 4.
11: fVCO/fDACCLK = 8.
10
0x09
4:3
PLL Loop Divide Ratio[1:0]
Sets the value of the DACCLK divider, which
determines the ratio of the DAC sample clock
frequency to the REFCLK frequency, fDACCLK/fREFCLK.
00: fDACCLK/fREFCLK = 2.
01: fDACCLK/fREFCLK = 4.
10: fDACCLK/fREFCLK = 8.
11: fDACCLK/fREFCLK = 16.
10
0x09
2:0
PLL Bias[2:0]
Controls VCO bias current. Set to 011 for optimal
performance.
010
Misc. Control
0x0A
7:5
VCO Control Voltage[2:0]
(read only)
000 to 111, proportional to voltage at VCO control
voltage input, readback only. A value of 011
indicates the VCO centered in its frequency range.
000
0x0A
4:0
PLL Loop Bandwidth[4:0]
Controls the bandwidth of the PLL filter. Increasing
the value lowers the loop bandwidth. Set to 01111
for optimal performance.
11111
I DAC Control
0x0C
0x0B
1:0
7:0
I DAC Gain Adjustment[9:8]
I DAC Gain Adjustment[7:0]
The I DAC Gain Adjustment[9:0] value is the I DAC
10-bit gain setting word. Bit 9 is the MSB and Bit 0
is the LSB.
01
11111001
0x0C
7
I DAC sleep
0: I DAC on.
1: I DAC off, but reference remains powered.
0
0x0C
6
I DAC power-down
0: I DAC on.
1: I DAC off.
0
Aux DAC1 Control
0x0E
0x0D
1:0
7:0
Auxiliary DAC1 Data[9:8]
Auxiliary DAC1 Data[7:0]
The auxiliary DAC 1 Data [9:0] value is the Aux DAC1
10-bit output current control word. Magnitude of
the auxiliary DAC current increases with increasing
value. Bit 9 is the MSB and Bit 0 is the LSB.
00
00000000
0x0E
7
Auxiliary DAC1 sign
0: AUX1_P active.
1: AUX1_N active.
0
0x0E
6
Auxiliary DAC1 current
direction
0: source.
1: sink.
0
0x0E
5
Auxiliary DAC1 power-down
0: auxiliary DAC1 on.
1: auxiliary DAC1 off.
0
Q DAC Control
0x10
0x0F
1:0
7:0
Q DAC Gain Adjustment[9:8]
Q DAC Gain Adjustment[7:0]
The Q DAC Gain Adjustment[9:0] value is the Q DAC
10-bit gain setting word. Bit 9 is the MSB and Bit 0
is the LSB.
01
11111001
0x10
7
Q DAC sleep
0: Q DAC on.
1: Q DAC off.
0
0x10
6
Q DAC power-down
0: Q DAC on.
1: Q DAC off.
0
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參數(shù)描述
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