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Linear Technology Electronic Components Datasheet

LTC6417 Datasheet

1.6GHz Low Noise High Linearity Differential Buffer/16-Bit ADC Driver

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Features
n 1.6GHz –3dB Small Signal Bandwidth
n Low Distortion Driving 50Ω Load, 2.4VP-P Out
–100dBc/–69dBc HD2/HD3 at 140MHz
–80dBc IM3 and 46dBm OIP3 at 140MHz
–100dBc/–66dBc HD2/HD3 at 380MHz
–68dBc IM3 and 39dBm OIP3 at 380MHz
n 1.5nV/√Hz Output Noise
n 4.3pA/√Hz Input Current Noise
n Programmable High Speed, Fast Recovery
Output Clamping
n 4.28VP-P Maximum Output Swing on a 50Ω
Differential Load
n DC-Coupled Signal Path
n Operates on Single 4.75V to 5.25V Supply
n Power: 615mW on 5V, Can Be Reduced to 370mW,
Shutdown Mode 120mW
n 3mm × 4mm 20-Lead QFN Package
Applications
n Differential ADC Driver
n CCD Buffer
n Cable Driver
n 50Ω Buffer
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
LTC6417
1.6GHz Low Noise High Linearity
Differential Buffer/16-Bit ADC
Driver with Fast Clamp
Description
The LTC®6417 is a differential unity gain buffer that can
drive a 50Ω load with extremely low noise and excellent
linearity. It is well suited for driving high speed 14- and
16-bit pipeline ADCs with input signals from DC to beyond
600MHz. Differential input impedance is 18.5kΩ, allowing
1:4 and 1:8 transformers to be used at the input providing
additional system gain in 50Ω systems.
With no external biasing or gain setting components and
a flow-through pinout, the LTC6417 is very easy to use. It
can be DC-coupled and has a common mode output offset
of –60mV. The LTC6417 input pins are internally biased to
provide an output common mode voltage that is set by
the voltage on the VCM pin for AC-coupled applications.
Supply current is typically 123mA and the LTC6417 operates
on supply voltages ranging from 4.75V to 5.25V. Power
consumption can be reduced to 74mA via the PWRADJ
pin. The LTC6417 also has a hardware shutdown feature
which reduces current consumption to 24mA.
The LTC6417 features fast, adjustable output voltage clamp-
ing to help protect subsequent circuitry. The CLHI pin sets
the maximum swing, while a symmetric minimum swing
is set up internally. LTC6417 VOR pin will signal overrange
when the clamps limit output voltage.
The LTC6417 is packaged in a 20-lead 3mm × 4mm QFN
package. Pinout is optimized for placement directly adjacent
to Linear Technology’s high speed 14- and 16-bit ADCs.
Typical Application
LTC6417 Driving an LTC2209 16-Bit ADC at 140MHz IF
5V
3.3V
50Ω
+–
680pF
0.1µF
1,6,
11,16
2.2µF
T1
WBC4-14LB
43
2
••
61
0.01µF
100Ω
100Ω
0.01µF
8
9
V+ 5
PWRADJ
2
IINN+–SLHTCD6NV4CC1ML7VHOI ROO1UU4TT+–1198
GND 12 15 1k
3, 7,10,
17, 20, 21
C43
27pF
E1
51nH
R36
60.4Ω
C41
12pF
R12
60.4Ω
C44
27pF
E2
51nH
2.2µF
E3
75nH
C45
18pF
E5
51nH
R42
300Ω
10Ω
C40
12pF
C10
12pF
R53
120Ω
R43
300Ω
10Ω
E3
75nH
C46
18pF
AIN+
LTC2209
16
AIN–
VCM PGA = 0
CLOCK
(153.6MHz)
6417 TA01a
LTC6417 Driving LTC2209
16-Bit ADC 32K Point FFT,
fIN = 140MHz, –1dBFS, PGA = 0
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
HD2 = –88dBc
HD3 = –94dBc
SFDR = 88dBc
SNR = 75.4dB
SEE FIGURE 1/TABLE 1
1:4 BALUN
fS = 153.6Msps
DEMO BOARD DC1685A
10 20 30 40 50 60 70 80
FREQUENCY (MHz)
6417 TA01b
6417f
1


Linear Technology Electronic Components Datasheet

LTC6417 Datasheet

1.6GHz Low Noise High Linearity Differential Buffer/16-Bit ADC Driver

No Preview Available !

LTC6417
Absolute Maximum Ratings
(Note 1)
Total Supply Voltage (V+ to GND)..............................5.5V
Input
Input
Current
Current
((CINL+H, II,NV–C).M...)..........................................................................±±3100mmAA
Output Current (OUT+, OUT).............................. ±100mA
Output Current (VOR)............................................ ±10mA
Operating Temperature Range
(TC) (Note 2)........................................... –40°C to 105°C
Specified Temperature Range
(TC) (Note 3)........................................... –40°C to 105°C
Storage Temperature Range................... –65°C to 150°C
Junction Temperature (TJMAX)............................... 150°C
Pin Configuration
TOP VIEW
V+
CLHI
GND
NC
PWRADJ
V+
1
2
3
4
5
6
20 19 18 17
21
GND
16 V+
15 VCM
14 VOR
13 NC
12 SHDN
11 V+
7 8 9 10
UDC PACKAGE
20-LEAD (3mm × 4mm) PLASTIC QFN
TJMAX = 150°C, θJA = 52°C/W, θJC = 6.8°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
LTC6417CUDC#PBF
LTC6417IUDC#PBF
LTC6417CUDC#TRPBF LFVN
LTC6417IUDC#TRPBF LFVN
20-Lead (3mm × 4mm) Plastic QFN
20-Lead (3mm × 4mm) Plastic QFN
*Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
0°C to 70°C
–40°C to 105°C (TC)
D C Electrical Characteristics The l denotes the specifications which apply over the full operating
PtdeeWmfiRpnAeeDrdaJatus=re(VIN+r,a+nS–gHeIDN,No)t.=hVe0OrVwUuTisDneIlFeFsspisseocdtiehfifecirnawetiidosneassna(oOrteeUdaT.t+VT–IANOC=UM2T5is°)C.d.eSfVein+ee=DdC5aVts,eG(sItNNcD+ir+=cuI0NiVt,s)N/c2ho.eRVmOLaOUtATiCDcM., CisLOdAeDfi=ne6dpFa.sV(COMU=T+1.+2O5VU,TCL)/H2I.
= V+,
VINDIFF
is
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input/Output Characteristics
GDIFF
Differential Gain
VINDIFF = ±1.2V Differential
–0.15
l –0.2
–0.1
0
0
dB
dB
TCGDIFF
Differential Gain Temperature
Coefficient
l 0.0002
dB/°C
VSWINGDIFF
VSWINGMIN
VSWINGMAX
Differential Output Voltage Swing
Output Voltage Swing Low
Output Voltage Swing High
VOUTDIFF, VINDIFF = ±2.3V
4
l 3.3
4.28
Single-Ended Measurement of OUT+, OUT
0.19 0.28
VINDIFF = ±2.3V
l 0.4
Single-Ended Measurement of OUT+, OUT
2.25 2.33
VINDIFF = ±2.3V
l 2.05
VVPP--PP
V
V
V
V
6417f
2


Part Number LTC6417
Description 1.6GHz Low Noise High Linearity Differential Buffer/16-Bit ADC Driver
Maker Linear
Total Page 30 Pages
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