參數(shù)資料
型號: LTC6945IUFD#TRPBF
廠商: Linear Technology
文件頁數(shù): 1/28頁
文件大?。?/td> 0K
描述: IC SYNTHESIZER INTEGER N 28QFN
軟件下載: PLLWizard™
PLLWizard™, with .NET 2.0 installer
標(biāo)準(zhǔn)包裝: 2,500
類型: *
PLL:
輸入: 時鐘
輸出: 時鐘
電路數(shù): 1
比率 - 輸入:輸出: 1:1
差分 - 輸入:輸出: 是/是
頻率 - 最大: 6GHz
除法器/乘法器: 是/無
電源電壓: 3.15 V ~ 5.25 V
工作溫度: -40°C ~ 105°C
安裝類型: 表面貼裝
封裝/外殼: 28-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 28-QFN(4x5)
包裝: 帶卷 (TR)
LTC6945
1
6945f
TYPICAL APPLICATION
FEATURES
DESCRIPTION
Ultralow Noise and Spurious
0.35GHz to 6GHz Integer-N
Synthesizer
TheLTC6945isahighperformance,lownoise,6GHzphase-
locked loop (PLL), including a reference divider, phase-
frequency detector (PFD) with phase-lock indicator, charge
pump, integer feedback divider and VCO output divider.
The part features a buffered, programmable VCO output
divider with a range of 1 through 6. The differential, low
noise output buffer has user-programmable output power
ranging from –6dBm to 3dBm, and may be muted through
either a digital input pin or software.
The low noise reference buffer outputs a typical 0dBm
square wave directly into a 50Ω impedance from 10MHz
to 250MHz, or may be disabled through software.
The ultralow noise charge pump contains selectable high
and low voltage clamps useful for VCO monitoring, and
also may be set to provide a V+/2 bias.
All device settings are controlled through a SPI-compatible
serial port.
LTC6945 Data Converter Sample Clock
1GHz Sample Clock Phase Noise
APPLICATIONS
n Low Noise Integer-N PLL
n 350MHz to 6GHz VCO Input Range
n –226dBc/Hz Normalized In-Band Phase Noise Floor
n –274dBc/Hz Normalized In-Band 1/f Noise
n –157dBc/Hz Wideband Output Phase Noise Floor
n Excellent Spurious Performance
n Output Divider (1 to 6, 50% Duty Cycle)
n Low Noise Reference Buffer
n Output Buffer Muting
n Charge Pump Supply from 3.15V to 5.25V
n Charge Pump Current from 250μA to 11.2mA
n Configurable Status Output
n SPI Compatible Serial Port Control
n PLLWizard Software Design Tool Support
n Wireless Base Stations (LTE, WiMAX, W-CDMA, PCS)
n Broadband Wireless Access
n Microwave Data Links
n Military and Secure Radio
n Test and Measurement
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PLLWizard is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
OFFSET FREQUENCY (Hz)
–160
PHASE
NOISE
(dBc/Hz)
–150
–130
–110
–100
100
10k
100k
10M 40M
6945 TA01b
–170
1k
1M
–120
–140
–180
DSB INTEGRATION
(100Hz TO 1GHz)
RMS NOISE = 0.014°
RMS JITTER = 39fs
fPFD = 25MHz
BW = 2.3kHz
VVCO
+
GND
VCO
+
VCO
VREFO
+
REFO
STAT
CS
SCLK
SDI
SDO
VD
+
MUTE GND RF
GND
LTC6945
fPFD = 25MHz
RF+ VRF
+ BB
REFREF+ VREF
+ CP VCP+
3.3V
68nH
SAMPLE CLOCK
1GHz, 7dBm
5V
3.3V
5V
VTUNE
432Ω
570nF
47nF
100pF
16.5Ω
CRYSTEK
CVCSO-914-1000
LOOP
BANDWIDTH
~2.3kHz
0.01μF
100pF
6945 TA01b
0.1μF
SPI BUS
470pF
1.0μF
0.01μF
51.1Ω
100MHz
REF
470pF
100pF
GND
0.1μF
100pF
50Ω
ALT SAMPLE CLOCK
500MHz OR 1GHz
3.3V
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