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Linear Technology Electronic Components Datasheet

LTC6957-3 Datasheet

Dual Output Buffer/Driver/Logic Converter

No Preview Available !

FEATURES
nn Low Phase Noise Buffer/Driver
nn Optimized Conversion of Sine Wave Signals to
Logic Levels
nn Three Logic Output Types Available
nn LVPECL
nn LVDS
nn CMOS
nn Additive Jitter 45fsRMS (LTC6957-1)
nn Frequency Range Up to 300MHz
nn 3.15V to 3.45V Supply Operation
nn Low Skew 3ps Typical
nn Fully Specified from –40°C to 125°C
nn 12-Lead MSOP and 3mm × 3mm DFN Packages
APPLICATIONS
nn System Reference Frequency Distribution
nn High Speed ADC, DAC, DDS Clock Driver
nn Military and Secure Radio
nn Low Noise Timing Trigger
nn Broadband Wireless Transceiver
nn High Speed Data Acquisition
nn Medical Imaging
nn Test and Measurement
LTC6957-1/LTC6957-2/
LTC6957-3/LTC6957-4
Low Phase Noise, Dual
Output Buffer/Driver/
Logic Converter
DESCRIPTION
The LTC®6957-1/LTC6957-2/LTC6957-3/LTC6957-4 is a
family of very low phase noise, dual output AC signal
buffer/driver/logic level translators. The input signal can
be a sine wave or any logic level (≤2VP-P). There are four
members of the family that differ in their output logic
signal type as follows:
LTC6957-1: LVPECL Logic Outputs
LTC6957-2: LVDS Logic Outputs
LTC6957-3: CMOS Logic, In-Phase Outputs
LTC6957-4: CMOS Logic, Complementary Outputs
The LTC6957 will buffer and distribute any logic signal
with minimal additive noise, however, the part really
excels at translating sine wave signals to logic levels. The
early amplifier stages have selectable lowpass filtering
to minimize the noise while still amplifying the signal to
increase its slew rate. This input stage filtering/noise limit-
ing is especially helpful in delivering the lowest possible
phase noise signal with slow slewing input signals such
as a typical 10MHz sine wave system reference.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents 7969189 and 8319551.
TYPICAL APPLICATION
3.3V
0.1µF
FILTA
OCXO
100MHz
+7dBm
SINE WAVE
10nF
50Ω
10nF
FILTB
IN+
IN
V+
GND
SD1
OUT1
TO PLL CHIPS
OR SYSTEM
SAMPLING CLOCKS
OUT2
SD2
6957 TA01a
For more information www.linear.com/LTC6957-1
Additive Phase Noise at 100MHz
–140
–145
SINGLE-ENDED SINE WAVE INPUT
AT +7dBm (500mVRMS)
FILTA = FILTB = GND
–150
–155
LTC6957-2 (LVDS)
LTC6957-4 (CMOS)
–160
LTC6957-3
(CMOS)
–165
100
LTC6957-1 (LVPECL)
1k 10k 100k
OFFSET FREQUENCY (Hz)
1M
69571234 TA01b
6957fb
1


Linear Technology Electronic Components Datasheet

LTC6957-3 Datasheet

Dual Output Buffer/Driver/Logic Converter

No Preview Available !

LTC6957-1/LTC6957-2/
LTC6957-3/LTC6957-4
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage (V+
Input Current (IN+,
IoNrV, DFIDL)TtAo,
GND...........................
FILTB, SD1, SD2)
3.6V
(Note 2)........................................................... ±10mA
LTC6957-1 Output Current ......................... 1mA, –30mA
LTC6957-2 Output Current .................................. ±10mA
LTC6957-3, LTC6957-4 Output Current (Note 3)... ±30mA
Specified Temperature Range
LTC6957I..............................................–40°C to 85°C
LTC6957H........................................... –40°C to 125°C
Junction Temperature ........................................... 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (for MSOP Soldering, 10sec).... 300°C
PIN CONFIGURATION
LTC6957-1, LTC6957-2
TOP VIEW
FILTA
V+
IN+
IN
GND
FILTB
1
2
3
4
5
6
12 SD1
11 OUT1+
13 10 OUT1
GND 9 OUT2
8 OUT2+
7 SD2
DD PACKAGE
12-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 58°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
LTC6957-1, LTC6957-2
TOP VIEW
FILTA 1
V+ 2
IN+ 3
IN4
GND 5
FILTB 6
12 SD1
11 OUT1+
10 OUT1
9 OUT2
8 OUT2+
7 SD2
MS PACKAGE
12-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 145°C/W
LTC6957-3, LTC6957-4
TOP VIEW
FILTA
V+
IN+
IN
GND
FILTB
1
2
3
4
5
6
12 SD1
11 VDD
13 10 OUT1
GND 9 OUT2
8 GNDOUT
7 SD2
DD PACKAGE
12-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 58°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
LTC6957-3, LTC6957-4
TOP VIEW
FILTA 1
V+ 2
IN+ 3
IN4
GND 5
FILTB 6
12 SD1
11 VDD
10 OUT1
9 OUT2
8 GNDOUT
7 SD2
MS PACKAGE
12-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 145°C/W
6957fb
2 For more information www.linear.com/LTC6957-1


Part Number LTC6957-3
Description Dual Output Buffer/Driver/Logic Converter
Maker Linear
Total Page 30 Pages
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