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LTC6416CDDB-TRPBF

Description
2 GHz Low Noise Differential 16-Bit ADC Buffer
File Size387KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC6416CDDB-TRPBF Overview

2 GHz Low Noise Differential 16-Bit ADC Buffer

FEATURES
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LTC6416
2 GHz Low Noise Differential
16-Bit ADC Buffer
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.
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
on the V
CM
pin.
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.
Supply current is nominally 42mA and the LTC6416 oper-
ates on supply voltages ranging from 2.7V to 3.9V.
The LTC6416 is packaged in a 10-lead 3mm
×
2mm DFN
package. Pinout is optimized for placement directly adjacent
to Linear’s high speed 12-, 14- and 16-bit ADCs.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
2GHz –3dB Small Signal Bandwidth
300MHz ±0.1dB Bandwidth
1.8nV/√Hz Output Noise
46.25dBm Equivalent OIP3 at 140MHz
40.25dBm Equivalent OIP3 Up to 300MHz
–81dBc/–72dBc HD2/HD3 at 140MHz, 2V
P-P
Out
–84.5dBc IM3 at 140MHz, 2V
P-P
Out Composite
–74dBc/–67.5dBc HD2/HD3 at 300MHz, 2V
P-P
Out
–72.5dBc IM3 at 300MHz, 2V
P-P
Out Composite
Programmable High Speed, Fast Recovery
Output Clamping
DC-Coupled Signal Path
Operates on Single 2.7V to 3.9V Supply
Low Power: 150mW on 3.6V
2mm
×
3mm 10-Pin DFN Package
APPLICATIONS
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Differential ADC Driver
IF Sampling Receivers
Impedance Transformer
SAW Filter Interface
CCD Buffer
TYPICAL APPLICATION
LTC6416 Driving LTC2208 ADC – 140MHz IF
AMPLITUDE (dBFS)
3.6V
680pF
0.1μF
CLHI
1:8
50Ω
200Ω
IN
+
LTC6416 Driving LTC2208 ADC
with 1:8 Transformer f
IN
=140MHz,
f
S
= 130MHz, –1dBFS, PGA = 1
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
PGA = 1
6416 TA01a
2.2μF
V
+
3.3V
1.5pF
AIN
+
1pF
AIN
LTC2208
16
V
+
= 3.6V
HD2 =
–94dBc
HD3 =
–89.1dBc
SFDR = 89.1dB
SNR = 70.7dB
MEASURED USING DC1257B
WITH MINI-CIRCUIT TCM8-1+
1:8 TRANSFORMER
V
CM
OUT
+
OUT
GND
25Ω
+
MINI-CIRCUITS
TCM8-1+
LTC6416
200Ω
IN
GND
0.1μF CLLO
25Ω
1.5pF
–110
–120
0
10
20
30
40
FREQUENCY (MHz)
50
60
6416 TA01b
CLOCK
(130MHz)
6416f
1

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