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LTC6416

更新时间： 2024-11-21 05:44:03
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凌特 - Linear /
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描述
2 GHz Low Noise Differential 16-Bit ADC Buffer

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LTC6416 数据手册

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LTC6416  
2 GHz Low Noise Differential  
16-Bit ADC Buffer  
FEATURES  
DESCRIPTION  
The LTC®6416 is a differential unity gain buffer designed  
to drive 16-bit ADCs with extremely low output noise  
and excellent linearity beyond 300MHz. Differential input  
impedance is 12kΩ, allowing 1:4 and 1:8 transformers to  
be used at the input to achieve additional system gain.  
n
2GHz –3dB Small Signal Bandwidth  
n
300MHz 0ꢀ1dB Bandwidth  
n
1ꢀ8nV/√Hz Output Noise  
n
46ꢀ25dBm Equivalent OIP3 at 140MHz  
n
40ꢀ25dBm Equivalent OIP3 Up to 300MHz  
n
–81dBc/–72dBc HD2/HD3 at 140MHz, 2V Out  
P-P  
With no external biasing or gain setting components and  
a flow-through pinout, the LTC6416 is very easy to use.  
It can be DC-coupled and has a common mode output  
offset of –40mV. If the input signals are AC-coupled, the  
LTC6416 input pins are internally biased to provide an  
output common mode voltage that is set by the voltage  
n
n
n
n
–84ꢀ5dBc IM3 at 140MHz, 2V Out Composite  
P-P  
–74dBc/–67ꢀ5dBc HD2/HD3 at 300MHz, 2V Out  
P-P  
–72ꢀ5dBc IM3 at 300MHz, 2V Out Composite  
P-P  
Programmable High Speed, Fast Recovery  
Output Clamping  
DC-Coupled Signal Path  
n
n
n
n
on the V pin.  
CM  
Operates on Single 2.7V to 3.9V Supply  
Low Power: 150mW on 3.6V  
2mm × 3mm 10-Pin DFN Package  
In addition the LTC6416 has high speed, fast recovery  
clamping circuitry to limit output signal swing. Both the  
high and low clamp voltages are internally biased to allow  
maximum output swing but are also user programmable  
via the CLLO and CLHI pins.  
APPLICATIONS  
n
Differential ADC Driver  
Supply current is nominally 42mA and the LTC6416 oper-  
ates on supply voltages ranging from 2.7V to 3.9V.  
n
IF Sampling Receivers  
n
Impedance Transformer  
SAW Filter Interface  
CCD Buffer  
The LTC6416 is packaged in a 10-lead 3mm × 2mm DFN  
package.Pinoutisoptimizedforplacementdirectlyadjacent  
to Linear’s high speed 12-, 14- and 16-bit ADCs.  
n
n
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other  
trademarks are the property of their respective owners.  
LTC6416 Driving LTC2208 ADC  
with 1:8 Transformer fIN =140MHz,  
fS = 130MHz, –1dBFS, PGA = 1  
TYPICAL APPLICATION  
0
+
V
= 3.6V  
–10  
–20  
–30  
–40  
–50  
–60  
–70  
–80  
–90  
–100  
HD2 = –94dBc  
HD3 = –89.1dBc  
LTC6416 Driving LTC2208 ADC – 140MHz IF  
SFDR = 89.1dB  
3.6V  
SNR = 70.7dB  
MEASURED USING DC1257B  
WITH MINI-CIRCUIT TCM8-1+  
1:8 TRANSFORMER  
680pF  
0.1μF  
2.2μF  
3.3V  
CLHI  
+
V
1.5pF  
1pF  
1:8  
V
25Ω  
CM  
OUT  
+
+
–
200Ω  
IN  
AIN  
+
–
50Ω  
16  
LTC6416  
–
LTC2208  
PGA = 1  
OUT  
+
AIN  
200Ω  
IN  
–
GND  
25Ω  
–110  
–120  
GND  
CLLO  
1.5pF  
6416 TA01a  
0.1μF  
MINI-CIRCUITS  
TCM8-1+  
20  
30  
40  
50  
0
60  
10  
FREQUENCY (MHz)  
CLOCK  
(130MHz)  
6416 TA01b  
6416f  
1
1234567...20

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