参数资料
型号: AD9523-1/PCBZ
厂商: Analog Devices Inc
文件页数: 43/60页
文件大小: 0K
描述: BOARD EVAL FOR AD9523-1
设计资源: AD9523(-1) Eval Board Schematic
AD9523(-1) BOM
AD9523(-1) 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: AD9523
主要属性: 板载 PLL 环路滤波器
次要属性: LED 状态指示器
已供物品:
AD9523-1
Rev. B | Page 48 of 60
Table 42. PLL1 Miscellaneous Control
Address
Bits
Bit Name
Description
7
Enable REFB R divider
independent division control
1: REFB R divider is controlled by Register 0x012 and Register 0x013.
0: REFB R divider is set to the same setting as the REFA R divider (Register 0x010
and Register 0x011). This requires that, for the loop to stay locked, the REFA and
REFB input frequencies must be the same.
6
OSC_CTRL control voltage to
VCC/2 when reference clock fails
High permits the OSC_CTRL control voltage to be forced to midsupply when the
feedback or input clocks fail. Low tristates the charge pump output.
1: OSC_CTRL control voltage goes to VCC/2.
0: OSC_CTRL control voltage tracks the tristated (high impedance) charge pump
(through the buffer).
5
Reserved
Reserved.
Programs the REFA, REFB mode selection (default = 000).
REF_SEL
Pin
Bit 4
Bit 3
Bit 2
Description
0
Nonrevertive: stay on REFB.
0
1
Revert to REFA.
0
1
0
Select REFA.
0
1
Select REFB.
0
1
REF_SEL pin = 0 (low): REFA.
[4:2]
Reference selection mode
1
REF_SEL pin = 1 (high): REFB.
1
Bypass REFB R divider
Puts the divider into bypass mode (same as programming divider word to 0 or 1).
1: divider in bypass mode (divide = 1).
0: divider normal operation.
0x01C
0
Bypass REFA R divider
Puts the divider into bypass mode (same as programming divider word to 0 or 1).
1: divider in bypass mode (divide = 1).
0: divider normal operation.
1 X = don’t care.
Table 43. PLL1 Loop Filter Zero Resistor Control
Address
Bits
Bit Name
Description
[7:4]
Reserved
Reserved.
Programs the value of the zero resistor, RZERO.
Bit 3
Bit 2
Bit 1
Bit 0
RZERO Value (kΩ)
0
883
0
1
677
0
1
0
341
0
1
135
0
1
0
10
0
1
0
1
10
0
1
0
10
0
1
10
0x01D
[3:0]
PLL1 loop filter, RZERO
1
0
Use external resistor
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