參數(shù)資料
型號(hào): AD9520-4BCPZ
廠商: Analog Devices Inc
文件頁數(shù): 62/80頁
文件大小: 0K
描述: IC CLOCK GEN 1.6GHZ VCO 64LFCSP
設(shè)計(jì)資源: Synchronizing Multiple AD9910 1 GSPS Direct Digital Synthesizers (CN0121)
Phase Coherent FSK Modulator (CN0186)
標(biāo)準(zhǔn)包裝: 1
類型: 時(shí)鐘發(fā)生器,扇出配送
PLL:
輸入: CMOS,LVDS,LVPECL
輸出: CMOS,LVPECL
電路數(shù): 1
比率 - 輸入:輸出: 2:12,2:24
差分 - 輸入:輸出: 是/是
頻率 - 最大: 1.8GHz
除法器/乘法器: 是/無
電源電壓: 3.135 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 64-VFQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 64-LFCSP-VQ(9x9)
包裝: 托盤
產(chǎn)品目錄頁面: 776 (CN2011-ZH PDF)
配用: AD9520-4/PCBZ-ND - BOARD EVAL FOR AD9520-4
Data Sheet
AD9520-4
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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