参数资料
型号: AD9522-0/PCBZ
厂商: Analog Devices Inc
文件页数: 20/84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:
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:
AD9522-0
Rev. 0 | Page 27 of 84
THEORY OF OPERATION
OPERATIONAL CONFIGURATIONS
The AD9522 can be configured in several ways. These
configurations must be set up by loading the control registers
(see Table 48 to Table 59). Each section or function must be
individually programmed by setting the appropriate bits in the
corresponding control register or registers. When the desired
configuration is programmed, the user can store these values in
the on-board EEPROM to allow the part to power up in the
desired configuration without user intervention.
Mode 0: Internal VCO and Clock Distribution
When using the internal VCO and PLL, the VCO divider must
be employed to ensure that the frequency presented to the channel
dividers does not exceed its specified maximum frequency (see
Table 3). The internal PLL uses an external loop filter to set the
loop bandwidth. The external loop filter is also crucial to the
loop stability.
When using the internal VCO, it is necessary to calibrate the
VCO (0x018[0]) to ensure optimal performance.
For internal VCO and clock distribution applications, the
register settings shown in Table 22 should be used.
Table 22. Settings When Using Internal VCO
Register
Description
0x010[1:0] = 00b
PLL normal operation (PLL on)
0x010 to 0x01E
PLL settings; select and enable a reference
input; set R, N (P, A, B), PFD polarity, and ICP
according to the intended loop configuration
0x1E1[1] = 1b
VCO selected as the source
0x01C[2:0]
Enable reference inputs
0x1E0[2:0]
Set VCO divider
0x1E1[0] = 0b
Use the VCO divider as the source for
the distribution section
0x018[0] = 0b
0x232[0] = 1b
Reset VCO calibration and issue IO_UPDATE
(not necessary for the first time after power-up
but must be done subsequently)
0x018[0] = 1b
0x232[0] = 1b
Initiate VCO calibration, issue IO_UPDATE
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参数描述
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