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参数资料
| 型号： | AD9522-0/PCBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 71/84页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD9522-0 CLK GEN |
| 设计资源： | AD9522 Eval Board Schematic AD9522 BOM |
| 标准包装： | 1 |
| 主要目的： | 计时，时钟发生器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | AD9522-0 |
| 主要属性： | 12 LVDS/24 CMOS 输出，2.8 GHz VCO |
| 次要属性： | I²C & SPI 接口 |
| 已供物品： | 板 |
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AD9522-0
Rev. 0 | Page 73 of 84
Reg.
Addr
(Hex) Bit(s) Name
Description
01D
[7]
Enable
STATUS_EEPROM
at STATUS pin
Enables the STATUS_EEPROM signal at the STATUS pin.
[7] = 0; the STATUS pin is controlled by 0x017[7:2] selection.
[7] = 1; select the STATUS_EEPROM signal at STATUS pin. This bit overrides 0x017[7:2] (default).
01D
[6]
Enable
XTAL OSC
Enables the maintaining amplifier needed by a crystal oscillator at the PLL reference input.
[6] = 0; crystal oscillator maintaining amplifier disabled (default).
[6] = 1; crystal oscillator maintaining amplifier enabled.
01D
[5]
Enable clock
doubler
Enable PLL reference input clock doubler.
[5] = 0; doubler disabled (default).
[5] = 1; doubler enabled.
01D
[4]
Disable PLL
status register
Disables the PLL status register readback.
[4] = 0; PLL status register enabled (default).
[4] = 1; PLL status register disabled. If this bit is set, Register 01F is not automatically updated.
01D
[3]
Enable LD pin
comparator
Enables the LD pin voltage comparator. This is used with the LD pin current source lock detect mode.
When the AD9522 is in internal (automatic) holdover mode, this enables the use of the voltage on the
LD pin to determine if the PLL was previously in a locked state (see Figure 47). Otherwise, this can be used
with the REFMON and STATUS pins to monitor the voltage on the LD pin.
[3] = 0; disable LD pin comparator and ignore the LD pin voltage; internal/automatic holdover
controller treats this pin as true (high, default).
[3] = 1; enable LD pin comparator (use LD pin voltage to determine if the PLL was previously locked).
01D
[1]
Enable external
holdover
Enables the external hold control through the SYNC pin. (This disables the internal holdover mode.)
[1] = 0; automatic holdover mode, holdover controlled by automatic holdover circuit (default).
[1] = 1; external holdover mode, holdover controlled by SYNC pin.
01D
[0]
Enable
holdover
Enables the internally controlled holdover function.
[0] = 0; holdover disabled (default).
[0] = 1; holdover enabled.
01E
[4:3]
External zero
delay
feedback
channel
divider select
[4]
[3]
Select Which Channel Divider to Use in the External Zero Delay Path
0
Select Channel Divider 0 (default).
0
1
Select Channel Divider 1.
1
0
Select Channel Divider 2.
1
Select Channel Divider 3
01E
[2]
Enable external
zero delay
Selects which zero delay mode to use.
[2] = 0; enables internal zero delay mode if 0x01E[1] = 1 (default).
[2] = 1; enables external zero delay mode if 0x01E[1] = 1.
01E
[1]
Enable zero
delay
Enables zero delay function.
[1] = 0; disables the zero delay function (default).
[1] = 1; enables the zero delay function.
01F
[6]
VCO calibration
finished
(read-only)
Readback register. Indicates the status of the VCO calibration.
[6] = 0; VCO calibration not finished.
[6] = 1; VCO calibration finished.
01F
[5]
Holdover active
(read-only)
Readback register. Indicates if the part is in the holdover state (see Figure 47). This is not the same as
holdover enabled.
[5] = 0; not in holdover.
[5] = 1; holdover state active.
01F
[4]
REF2 selected
(read-only)
Readback register. Indicates which PLL reference is selected as the input to the PLL.
[4] = 0; REF1 selected (or differential reference if in differential mode).
[4] = 1; REF2 selected.
01F
[3]
VCO frequency
> threshold
(read-only)
Readback register. Indicates if the VCO frequency is greater than the threshold (see Table 17, REF1, REF2, and
VCO frequency status monitor parameter).
[3] = 0; VCO frequency is less than the threshold.
[3] = 1; VCO frequency is greater than the threshold.
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