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參數(shù)資料
型號(hào): LTC6946IUFD-3#TRPBF
廠商: Linear Technology
文件頁數(shù): 24/30頁
文件大?。?/td> 0K
描述: IC INTEGER-N PLL W/VCO 28QFN
軟件下載: PLLWizard™
PLLWizard™, with .NET 2.0 installer
標(biāo)準(zhǔn)包裝: 2,500
類型: 時(shí)鐘/頻率合成器(RF/IF),分?jǐn)?shù)-N,整數(shù)-N,
PLL:
輸入: 時(shí)鐘
輸出: 時(shí)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: 5.79GHz
除法器/乘法器: 是/是
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)
LTC6946
30
6946fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
LINEAR TECHNOLOGY CORPORATION 2011
LT 1111 REV A PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER
DESCRIPTION
COMMENTS
LTC5540/LTC5541
LTC5542/LTC5543
High Dynamic Range Down Mixers
8dB Conversion Gain, 26.4dBm IIP3, 9.6dB NF, 600MHz to 4GHz
LTC5590/LTC5591
LTC5592/LTC5593
High Linearity Dual Mixers
600MHz to 4.5GHz, 8.5dB Gain, 26.2dBm IIP3, 9.9dB NF
LTC5569
Broadband Dual Mixer
300MHz to 4GHz, 26.8dB IIP3, 2dB Gain, 11.7dB NF, 600mW Power
LTC5588-1
Ultrahigh OIP3 I/Q Modulator
200MHz to 6GHz, 31dBm OIP3, –160.6dBm/Hz Noise Floor
LT
5575
Direct Conversion I/Q Demodulator
800MHz to 2.7GHz, 22.6dBm IIP3, 60dBm IIP3, 12.7dB NF
LTC6946-2 Driving a Passive Downconverting Mixer
MUTE
GND
RF
RF
+
V
RF
+
BB
REF
+
REF
V
REF
+
CP
V
CP
+
GND
VREFO+
REFO
STAT
CS
SCLK
SDI
SDO
VD+
VVCO+
GND
CMA
CMB
CMC
GND
TB
TUNE
LTC6946-2
SPI BUS
3.3V
470pF
51.1Ω
+
15Ω
5V
RZ
1μF
3.3V
LOOP COMPENSATION
COMPONENT VALUES ARE
APPLICATION SPECIFIC
DEPENDING ON THE LO
FREQUENCY RANGE AND
STEP SIZE AND THE PHASE
NOISE OF THE REFERENCE
CI
0.01μF
0.1μF
3.3V
1μF
0.01μF
2.2μF
CP
0.01μF
BALUN TDK HHM1525
3.3V
LO2
LO1
LOBIAS
LOSEL
VCC3
IFBIAS
IFGND
SHDN
GND
LTC5541
GND GND
VCC2
CT
RF
VCC1
1μF
3.3V
30nH
IF+
150nH
IF
470pF
10MHz
REFERENCE
TOKO
4DFB-1842N-10
22pF
1μF
3.3V
LO = 1842MHz
0.1μF
ADC
150nH 1nF 140MHz
SAW
140MHz
BPF
1.5pF
2.2pF
LNA
IMAGE
BPF
RF IN
1952MHz
TO 2012MHZ
3.3V
22pF
1nF
6946 TA03
RF BLOCKER POWER (dBm)
–20
9
SSB
NOISE
FIGURE
(dB)
10
12
13
14
–10
0
5
18
6946 TA03b
11
–15
–5
15
16
17
RF = 1982MHz
BLOCKER = 2082MHz
LO = LTC6946-2
LO = CLEAN LAB SOURCE
LTC5541 Noise Figure vs Blocker
Power and LO Signal Source
LTC6946-2 Mixer Application
Phase Noise
OFFSET FREQUENCY (Hz)
–130
–140
PHASE
NOISE
(dBc/Hz)
–110
–90
–150
–120
–100
100
10k
100k
1M
10M
6946 TA03c
–160
1k
RMS NOISE = 0.270°
fRF = 1842MHz
fPFD = 2MHz
OD = 2
fSTEP = 1MHz
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