参数资料
型号: AD9549A/PCBZ
厂商: Analog Devices Inc
文件页数: 60/76页
文件大小: 0K
描述: BOARD EVALUATION FOR AD9549A
设计资源: AD9549 Schematics
AD9549 Gerber Files
标准包装: 1
主要目的: 计时,时钟发生器
嵌入式:
已用 IC / 零件: AD9549A
主要属性: 8 kHz ~ 750 MHz 输入
次要属性: 差分输出
已供物品:
AD9549
Rev. D | Page 63 of 76
Register 0x01C3—Reference Validation
Table 71.
Bits
Bit Name
Description
[7:5]
Reserved
Reserved.
[4:0]
Validation timer
The value in this register sets the time required to validate a reference after an LOR or OOL event
before the reference can be used as the DPLL reference. This circuit uses the digital loop filter clock
(see Register 0x0107). Validation time = loop filter clock period × 2(ValidationTimer [4:0] +1) 1. Assuming
power-on defaults, the recovery time varies from 32 ns (00000) to 137 sec (11111). If longer valida-tion
times are required, the user can make the P-divider larger. The user should be careful to set the
validation timer to at least two periods of the OOL evaluation period. The OOL evaluation period is the
period of reference input clock times the OOL divider (Register 0x0322 to Register 0x0323).
DOUBLER AND OUTPUT DRIVERS (REGISTER 0x0200 TO REGISTER 0x0201)
Register 0x0200—HSTL Driver
Table 72.
Bits
Bit Name
Description
4
OPOL
Output polarity. Setting this bit inverts the HSTL driver output polarity.
[3:2]
Reserved
Reserved.
[1:0]
HSTL output doubler
HSTL output doubler.
01 = doubler disabled.
10 = doubler enabled. When using doubler, Register 0x0010[5] must also be set.
Register 0x0201—CMOS Driver
Table 73.
Bits
Bit Name
Description
0
CMOS mux
User mux control. This bit allows the user to select whether the CMOS driver output is divided by the
S-divider.
0 = S-divider input sent to CMOS driver.
1 = S-divider output sent to CMOS driver. See Figure 22.
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