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LTC6948IUFD-4#PBF

Description
IC FRACTIONAL-N PLL W/VCO 28QFN
CategoryAnalog mixed-signal IC    The signal circuit   
File Size494KB,38 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
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LTC6948IUFD-4#PBF Overview

IC FRACTIONAL-N PLL W/VCO 28QFN

LTC6948IUFD-4#PBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
MakerLinear ( ADI )
Parts packaging codeQFN
package instructionQFN-28
Contacts28
Manufacturer packaging codeUFD
Reach Compliance Codecompliant
ECCN code3A991
Analog Integrated Circuits - Other TypesPLL FREQUENCY SYNTHESIZER
JESD-30 codeR-PQCC-N28
JESD-609 codee3
length5 mm
Humidity sensitivity level1
Number of functions1
Number of terminals28
Maximum operating temperature105 °C
Minimum operating temperature-40 °C
Package body materialPLASTIC/EPOXY
encapsulated codeHVQCCN
Package shapeRECTANGULAR
Package formCHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)NOT SPECIFIED
Maximum seat height0.8 mm
Maximum supply voltage (Vsup)3.45 V
Minimum supply voltage (Vsup)3.15 V
Nominal supply voltage (Vsup)3.3 V
surface mountYES
technologyCMOS
Temperature levelINDUSTRIAL
Terminal surfaceMatte Tin (Sn)
Terminal formNO LEAD
Terminal pitch0.5 mm
Terminal locationQUAD
Maximum time at peak reflow temperatureNOT SPECIFIED
width4 mm
FeaTures
n
n
n
n
n
n
n
n
n
n
n
n
LTC6948
Ultralow Noise 0.37GHz to
6.39GHz Fractional-N Synthesizer
with Integrated VCO
DescripTion
The
LTC
®
6948
is a high performance, low noise, 6.39GHz
phase-locked loop (PLL) with a fully integrated VCO,
including a reference divider, phase-frequency detector
(PFD), ultralow noise charge pump, fractional feedback
divider, and VCO output divider.
The fractional divider uses an advanced, 4th order Δ∑
modulator which provides exceptionally low spurious
levels. This allows wide loop bandwidths, producing
extremely low integrated phase noise values.
The programmable VCO output divider, with a range of 1
through 6, extends the output frequency range.
Output Frequency Options
LTC6948-1
O_DIV = 1
O_DIV = 2
O_DIV = 3
O_DIV = 4
O_DIV = 5
O_DIV = 6
LTC6948-2
LTC6948-3
LTC6948-4
2.240 to 3.740 3.080 to 4.910 3.840 to 5.790 4.200 to 6.390
1.120 to 1.870 1.540 to 2.455 1.920 to 2.895 2.100 to 3.195
0.747 to 1.247 1.027 to 1.637 1.280 to 1.930 1.400 to 2.130
0.560 to 0.935 0.770 to 1.228 0.960 to 1.448 1.050 to 1.598
0.448 to 0.748 0.616 to 0.982 0.768 to 1.158 0.840 to 1.278
0.373 to 0.623 0.513 to 0.818 0.640 to 0.965 0.700 to 1.065
Low Noise Fractional-N PLL with Integrated VCO
No ∆-∑ Modulator Spurs
18-Bit Fractional Denominator
–226 dBc/Hz Normalized In-Band Phase Noise Floor
–274 dBc/Hz Normalized In-Band 1/f Noise
–157 dBc/Hz Wideband Output Phase Noise Floor
Excellent Integer Boundary Spurious Performance
Output Divider (1 to 6, 50% Duty Cycle)
Output Buffer Muting
Reference Input Frequency Up to 425MHz
Fast Frequency Switching
FracNWizard™ Software Design Tool Support
applicaTions
n
n
n
n
Wireless Basestations (LTE, WiMAX, W-CDMA, PCS)
Microwave Data Links
Military and Secure Radio
Test and Measurement
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
FracNWizard is a trademark of Analog Devices, Inc. All other trademarks are the property of
their respective owners.
Typical applicaTion
6.3GHz Wideband Receiver
1.6nF
76.8
15
1µF
10µH
5V
76.8
–90
1µF
1µF
GND
REF
V
REF+
V
CP+
GND
V
VCO+
REF
+
STAT
CS
SCLK
SDI
SDO
LDO
V
D+
CP
BVCO
GND
CM
A
CM
B
CM
C
GND
TB
TUNE
1µF
2.2µF
0.01µF
56nF
0.01µF
PHASE NOISE (dBc/Hz)
1µF
–100
–110
–120
–130
RMS NOISE = 0.412°
–140 RMS JITTER = 183fs
f
PFD
= 50MHz
–150 LOOP BW = 186kHz
INTN = 0
CPLE = 1
–160
1M
1k
100
10k
100k
OFFSET FREQUENCY (Hz)
0.1µF 3.3V
2.4nF
LTC6948-4 Phase Noise,
f
RF
= 6236MHz
100MHz
51.1
SPI BUS
0.1µF
LTC6948-4
MUTE
V
RF+
GND
RF
RF
+
3.3V
3.3V
0.1µF
BB
UNUSED OUTPUT
AVAILABLE FOR
OTHER USE
50
3.3V
68nH
3.3V
0.01µF
100pF
R = 2, f
PFD
= 50MHz
N = 84 TO 127.8
LBW = 186kHz
O=1
10M 40M
6946 TA01b
0.1µF
68nH 100pF
f
LO
= 4200MHz TO 6390MHz IN 190.7Hz STEPS
RF INPUT SIGNAL
LO IF
RF
IF OUTPUT
6948 TA01a
6948fa
For more information
www.linear.com/LTC6948
1

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Description IC FRACTIONAL-N PLL W/VCO 28QFN IC FRACTIONAL-N PLL W/VCO 28QFN IC FRACTIONAL-N PLL W/VCO 28QFN IC FRACTIONAL-N PLL W/VCO 28QFN IC FRACTIONAL-N PLL W/VCO 28QFN IC FRACTIONAL-N PLL W/VCO 28QFN IC FRACTIONAL-N PLL W/VCO 28QFN IC FRACTIONAL-N PLL W/VCO 28QFN
type - Clock/Frequency Synthesizer (RF/IF), Fractional-N Clock/Frequency Synthesizer (RF/IF), Fractional-N Clock/Frequency Synthesizer (RF/IF), Fractional-N Clock/Frequency Synthesizer (RF/IF), Fractional-N Clock/Frequency Synthesizer (RF/IF), Fractional-N Clock/Frequency Synthesizer (RF/IF), Fractional-N Clock/Frequency Synthesizer (RF/IF), Fractional-N
PLL - yes yes yes yes yes yes yes
enter - clock clock clock clock clock clock clock
output - clock clock clock clock clock clock clock
Number of circuits - 1 1 1 1 1 1 1
Ratio - Input:Output - 1:1 1:1 1:1 1:1 1:1 1:1 1:1
Differential - Input:Output - Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Frequency - maximum - 3.74GHz 4.91GHz 5.79GHz 6.39GHz 4.91GHz 5.79GHz 3.74GHz
Frequency divider/multiplier - yes/no yes/no yes/no yes/no yes/no yes/no yes/no
Voltage - Power - 3.15 V ~ 5.25 V 3.15 V ~ 5.25 V 3.15 V ~ 5.25 V 3.15 V ~ 5.25 V 3.15 V ~ 5.25 V 3.15 V ~ 5.25 V 3.15 V ~ 5.25 V
Operating temperature - -40°C ~ 105°C -40°C ~ 105°C -40°C ~ 105°C -40°C ~ 105°C -40°C ~ 105°C -40°C ~ 105°C -40°C ~ 105°C
Installation type - surface mount surface mount surface mount surface mount surface mount surface mount surface mount
Package/casing - 28-WFQFN Exposed Pad 28-WFQFN Exposed Pad 28-WFQFN Exposed Pad 28-WFQFN Exposed Pad 28-WFQFN Exposed Pad 28-WFQFN Exposed Pad 28-WFQFN Exposed Pad
Supplier device packaging - 28-QFN(4x5) 28-QFN(4x5) 28-QFN(4x5) 28-QFN(4x5) 28-QFN(4x5) 28-QFN(4x5) 28-QFN(4x5)
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