参数资料
型号: AD9520-0BCPZ-REEL7
厂商: Analog Devices Inc
文件页数: 62/80页
文件大小: 0K
描述: IC CLOCK GEN 2.8GHZ VCO 64LFCSP
设计资源: Synchronizing Multiple AD9910 1 GSPS Direct Digital Synthesizers (CN0121)
Phase Coherent FSK Modulator (CN0186)
标准包装: 750
类型: 时钟发生器,扇出配送
PLL:
输入: CMOS,LVDS,LVPECL
输出: CMOS,LVPECL
电路数: 1
比率 - 输入:输出: 2:12,2:24
差分 - 输入:输出: 是/是
频率 - 最大: 2.95GHz
除法器/乘法器: 是/无
电源电压: 3.135 V ~ 3.465 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 64-VFQFN 裸露焊盘,CSP
供应商设备封装: 64-LFCSP-VQ(9x9)
包装: 带卷 (TR)
Data Sheet
AD9520-0
Rev. A | Page 65 of 80
Table 54. PLL
Reg.
Addr.
(Hex) Bits Name
Description
0x010 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; Bit 7 = 0b.
0: positive (higher control voltage produces higher frequency) (default).
1: negative (higher control voltage produces lower frequency).
[6:4] CP current
Charge pump current (with CPRSET = 5.1 k).
Bit
6
Bit
5
Bit
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)
[3:2] CP mode
Charge pump operating mode.
Bit
3
Bit
2 Charge Pump Mode
0
High impedance state.
0
1
Forces source current (pump up).
1
0
Forces sink current (pump down).
1
Normal operation (default).
[1:0] PLL power-down PLL operating mode.
Bit
1
Bit
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.
0x011 [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).
0x012 [7:6] Unused
Unused.
[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).
0x013 [7:6] Unused
Unused.
[5:0] 6-bit A counter
A counter (part of N divider). The N divider is also called the feedback divider (default: 0x00).
0x014 [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).
0x015 [7:5] Unused
Unused.
[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).
0x016 7
Set CP pin
to VCP/2
Sets the CP pin to one-half of the VCP supply voltage.
0: CP normal operation (default).
1: CP pin set to VCP/2.
6
Reset R counter
Resets R counter (R divider).
0: normal (default).
1: holds R counter in reset.
5
Reset A and B
counters
Resets A and B counters (part of N divider).
0: normal (default).
1: holds A and B counters in reset.
4
Reset all
counters
Resets R, A, and B counters.
0: normal (default).
1: holds R, A, and B counters in reset.
3
B counter bypass B counter bypass. This is valid only when operating the prescaler in FD mode.
0: normal (default).
1: B counter is set to divide-by-1. This allows the prescaler setting to determine the divide for the N divider.
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