Linear Technology LTC6946-2 Demo, Ultralow Noise and Spurious 513MHz to 4.91GHz Integer-N Synthesizer with Integrated VCO (Req DC590) Line DC1705B-B Scheda Tecnica
Codici prodotto
DC1705B-B
LTC6946
1
6946fa
TYPICAL APPLICATION
FEATURES
DESCRIPTION
Ultralow Noise and Spurious
0.37GHz to 5.7GHz Integer-N
Synthesizer with Integrated VCO
The LTC
®
6946 is a high performance, low noise, 5.7GHz
phase-locked loop (PLL) with a fully integrated VCO,
including a reference divider, phase-frequency detector
(PFD) with phase-lock indicator, ultralow noise charge
pump, integer feedback divider, and VCO output divider.
The charge pump contains selectable high and low voltage
clamps useful for VCO monitoring.
including a reference divider, phase-frequency detector
(PFD) with phase-lock indicator, ultralow noise charge
pump, integer feedback divider, and VCO output divider.
The charge pump contains selectable high and low voltage
clamps useful for VCO monitoring.
The integrated low noise VCO uses no external components.
It is internally calibrated to the correct output frequency
with no external system support.
It is internally calibrated to the correct output frequency
with no external system support.
The part features a buffered, programmable VCO output
divider with a range of 1 through 6, providing a wide
frequency range.
divider with a range of 1 through 6, providing a wide
frequency range.
LTC6946-3 PLL Phase Noise
APPLICATIONS
n
Low Noise Integer-N PLL with Integrated VCO
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
Output Buffer Muting
n
Low Noise Reference Buffer
n
Charge Pump Current Adjustable 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
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.
PLLWizard is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
OFFSET FREQUENCY (Hz)
–140
PHASE NOISE (dBc/Hz)
–130
–110
–90
–80
100
10k
100k
10M 40M
6946 TA01b
–150
1k
1M
–100
–120
–160
RMS NOISE = 0.61°
RMS JITTER = 296fs
f
RMS JITTER = 296fs
f
RF
= 5.7GHz
f
PFD
= 10MHz
BW = 85kHz
GND
V
CP
+
CP
V
REF
+
REF
–
REF
+
BB
V
RF
+
RF
+
RF
–
GND
MUTE
V
REFO
+
REFO
S
TAT
CS
SCLK
SDI
SDO
V
D
+
V
VCO
+
GND
CM
A
CM
B
CM
C
GND
TB
TUNE
LTC6946-3
0.01μF
0.01μF
2.2μF
0.01μF
100pF
0.01μF
68nH
68nH
1μF
3.3V
3.3V
4.7nF
57nF
100pF
UNUSED OUTPUT
IS AVAILABLE
FOR OTHER USE
RF INPUT
SIGNAL
TO IF
PROCESSING
PROCESSING
LO
IF
RF
0.01μF
470pF
0.1μF
0.1μF
3.3V
6946 TA01a
3.3V
3.3V
+
470pF
51.1Ω
50Ω
SPI BUS
10MHz
15Ω
97.6Ω
5V
Frequency Coverage Options
LTC6946-1
LTC6946-2
LTC6946-3
VCO Frequency (GHz) 2.240 to 3.740
3.080 to 4.910
3.840 to 5.790
O DIV = 1
2.240 to 3.740
3.080 to 4.910
3.840 to 5.790
O DIV = 2
1.120 to 1.870
1.540 to 2.455
1.920 to 2.895
0 DIV = 3
0.747 to 1.247
1.027 to 1.637
1.280 to 1.930
O DIV = 4
0.560 to 0.935
0.770 to 1.228
0.960 to 1.448
O DIV = 5
0.448 to 0.748
0.616 to 0.982
0.768 to 1.158
O DIV = 6
0.373 to 0.623
0.513 to 0.818
0.640 to 0.965
5.7GHz Wideband Receiver