參數(shù)資料
型號(hào)： AD9522-3/PCBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 64/84頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL FOR AD9522-3 CLK GEN
設(shè)計(jì)資源： AD9522 Eval Board Schematic
AD9522 BOM
標(biāo)準(zhǔn)包裝： 1
主要目的： 計(jì)時(shí)，時(shí)鐘發(fā)生器
嵌入式： 否
已用 IC / 零件： AD9522-3
主要屬性： 12 LVDS/24 CMOS 輸出，2 GHz VCO
次要屬性： I²C & SPI 接口
已供物品： 板
AD9522-3
Rev. 0 | Page 67 of 84
Table 52. PLL
Reg.
Addr
(Hex) Bit(s) Name
Description
010
[7]
PFD polarity
Sets the PFD polarity. Negative polarity is for use (if needed) with external VCO/VCXO only.
The on-chip VCO requires positive polarity, [7] = 0.
[7] = 0; positive (higher control voltage produces higher frequency) (default).
[7] = 1; negative (higher control voltage produces lower frequency).
010
[6:4]
CP current
Charge pump current (with CPRSET = 5.1 kΩ).
[6]
[5]
[4]
ICP (mA)
0
0.6
0
1
1.2
0
1
0
1.8
0
1
2.4
1
0
3.0
1
0
1
3.6
1
0
4.2
1
4.8 (default)
010
[3:2]
CP mode
Charge pump operating mode.
[3]
[2]
Charge Pump Mode
0
High impedance state.
0
1
Force source current (pump up).
1
0
Force sink current (pump down).
1
Normal operation (default).
010
[1:0]
PLL power-
down
PLL operating mode.
[1]
[0]
Mode
0
Normal operation; this mode must be selected to use the PLL.
0
1
Asynchronous power-down (default).
1
0
Unused.
1
Synchronous power-down.
011
[7:0]
14-bit R counter,
Bits[7:0] (LSB)
Reference divider LSBs—lower eight bits. The reference divider (also called the R divider or R counter) is
14 bits long. The lower eight bits are in this register (default: 0x01).
012
[5:0]
14-bit R counter,
Bits[13:8] (MSB)
Reference divider MSBs—upper six bits. The reference divider (also called the R divider or R counter) is
14 bits long. The upper six bits are in this register (default: 0x00).
013
[5:0]
6-bit A counter
A counter (part of N divider). The N divider is also called the feedback divider (default: 0x00).
014
[7:0]
13-bit B counter,
Bits[7:0] (LSB)
B counter (part of N divider)—lower eight bits. The N divider is also called the feedback divider (default: 0x03).
015
[4:0]
13-bit B counter,
Bits[12:8] (MSB)
B counter (part of N divider)—upper five bits. The N divider is also called the feedback divider (default: 0x00).
016
[7]
Set CP pin
to VCP/2
Sets the CP pin to one-half of the VCP supply voltage.
[7] = 0; CP normal operation (default).
[7] = 1; CP pin set to VCP/2.
016
[6]
Reset R counter
Reset R counter (R divider).
[6] = 0; normal (default).
[6] = 1; hold R counter in reset.
016
[5]
Reset A and B
counters
Reset A and B counters (part of N divider).
[5] = 0; normal (default).
[5] = 1; hold A and B counters in reset.
016
[4]
Reset all
counters
Reset R, A, and B counters.
[4] = 0; normal (default).
[4] = 1; hold R, A, and B counters in reset.
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