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LTC6400IUD-20#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC6400-20
1
640020f
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
1.8GHz Low Noise, Low
Distortion Differential ADC
Driver for 300MHz IF
The LTC
®
6400-20 is a high-speed differential amplifi er
targeted at processing signals from DC to 300MHz. The
part has been specifi cally designed to drive 12-, 14- and
16-bit ADCs with low noise and low distortion, but can also
be used as a general-purpose broadband gain block.
The LTC6400-20 is easy to use, with minimal support
circuitry required. The output common mode voltage is
set using an external pin, independent of the inputs, which
eliminates the need for transformers or AC-coupling ca-
pacitors in many applications. The gain is internally fi xed
at 20dB (10V/V).
The LTC6400-20 saves space and power compared to
alternative solutions using IF gain blocks and transform-
ers. The LTC6400-20 is packaged in a compact 16-lead
3mm × 3mm QFN package and operates over the –40°C
to 85°C temperature range.
Equivalent Output IP3 vs
Frequency
■
1.8GHz –3dB Bandwidth
■
Fixed Gain of 10V/V (20dB)
■
–94dBc IMD
3
at 70MHz (Equivalent OIP3 = 51dBm)
■
–65dBc IMD
3
at 300MHz (Equivalent OIP3 = 36.5dBm)
■
1nV/√Hz Internal Op Amp Noise
■
2.1nV/√Hz Total Input Noise
■
6.2dB Noise Figure
■
Differential Inputs and Outputs
■
200Ω Input Impedance
■
2.85V to 3.5V Supply Voltage
■
90mA Supply Current (270mW)
■
1V to 1.6V Output Common Mode Voltage,
Adjustable
■
DC- or AC-Coupled Operation
■
Max Differential Output Swing 4.4V
P-P
■
Small 16-Lead 3mm × 3mm × 0.75mm QFN Package
■
Differential ADC Driver
■
Differential Driver/Receiver
■
Single Ended to Differential Conversion
■
IF Sampling Receivers
■
SAW Filter Interfacing
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
29Ω
66.5Ω
0.1μF
0.1μF
640020 TA01a
LTC6400-20
V
OCM
V
+
ENABLE
–IN
+IN
LTC2208
10Ω
0.1μF
INPUT
1000pF
LTC2208 130Msps
16-Bit ADC
1.25V
3.3V
10Ω
+OUT
+OUTF
–OUTF
–OUT
V
–
AIN
+
AIN
–
V
CM
V
DD
20dB GAIN
0.1μF
Single-Ended to Differential ADC Driver
FREQUENCY (MHz)
050
OUTPUT IP3 (dBm)
60
50
40
30
20
10
0
100 150 200
640020 TA01b
250 300
(NOTE 7)
LTC6400-20
2
640020f
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
+
– V
–
) ..........................................3.6V
Input Current (Note 2) ..........................................±10mA
Operating Temperature Range
(Note 3) ............................................... –40°C to 85°C
Specifi ed Temperature Range
(Note 4) ............................................... –40°C to 85°C
Storage Temperature Range ................... –65°C to 150°C
Maximum Junction Temperature .......................... 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
(Note 1)
16 15 14 13
5 6 7 8
TOP VIEW
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
9
10
11
17
12
4
3
2
1V
+
V
OCM
V
+
V
–
V
–
ENABLE
V
+
V
–
–IN
–IN
+IN
+IN
–OUT
–OUTF
+OUTF
+OUT
T
JMAX
= 125°C, θ
JA
= 68°C/W, θ
JC
= 4.2°C/W
EXPOSED PAD (PIN 17) IS V
–
, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LTC6400 AND LTC6401 SELECTOR GUIDE
PART NUMBER GAIN
(dB)
GAIN
(V/V)
Z
IN
(DIFFERENTIAL)
(Ω)
I
S
(mA)
LTC6400-20 20 10 200 90
LTC6401-20 20 10 200 50
In addition to the LTC6400 family of amplifi ers, a lower power LTC6401 family is available. The LTC6401 is pin compatible to the LTC6400, and has the
same low noise performance. The lower power consumption of the LTC6401 comes at the expense of slightly higher non-linearity, especially at input
frequencies above 140MHz. Please refer to the separate LTC6401 data sheets for complete details. Other gain versions from 8dB to 26dB will follow.
Please check each datasheet for complete details.
PIN CONFIGURATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC6400CUD-20#PBF LTC6400CUD-20#TRPBF LCCS 16-Lead (3mm × 3mm) Plastic QFN 0°C to 70°C
LTC6400IUD-20#PBF LTC6400IUD-20#TRPBF LCCS 16-Lead (3mm × 3mm) Plastic QFN –40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
LTC6400-20
3
640020f
DC ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Input/Output Characteristic
G
DIFF
Gain V
IN
= ±100mV Differential
●
19.4 20 20.6 dB
TC
GAIN
Gain Temperature Drift V
IN
= ±100mV Differential
●
–1.5 mdB/°C
V
SWINGMIN
Output Swing Low Each Output, V
IN
= ±600mV Differential
●
80 150 mV
V
SWINGMAX
Output Swing High Each Output, V
IN
= ±600mV Differential
●
2.35 2.46 V
V
OUTDIFFMAX
Maximum Differential Output Swing 1dB Compressed
●
4.4 V
P-P
I
OUT
Output Current Drive Each Output
●
20 mA
V
OSDIFF
Input Differential Offset Voltage
●
–2 2 mV
TCV
OSDIFF
Input Differential Offset Voltage Drift T
MIN
to T
MAX
●
1.2 μV/°C
I
VRMIN
Input Common Mode Voltage Range, MIN 1 V
I
VRMAX
Input Common Mode Voltage Range, MAX 1.6 V
R
INDIFF
Input Resistance (+IN, –IN) Differential
●
170 200 230
Ω
C
INDIFF
Input Capacitance (+IN, –IN) Differential, Includes Parasitic 1 pF
R
OUTDIFF
Output Resistance (+OUT, –OUT) Differential
●
18 25 32
Ω
R
OUTFDIFF
Filtered Output Resistance (+OUTF, –OUTF) Differential
●
85 100 115
Ω
C
OUTFDIFF
Filtered Output Capacitance (+OUTF, –OUTF) Differential, Includes Parasitic 2.7 pF
CMRR Common Mode Rejection Ratio Input Common Mode Voltage 1.1V~1.4V
●
45 65 dB
Output Common Mode Voltage Control
G
CM
Common Mode Gain V
OCM
= 1V to 1.6V 1 V/V
V
OCMMIN
Output Common Mode Range, MIN
●
1
1.1
V
V
V
OCMMAX
Output Common Mode Range, MAX
●
1.6
1.5
V
V
V
OSCM
Common Mode Offset Voltage V
OCM
= 1.1V to 1.5V
●
–15 15 mV
TCV
OSCM
Common Mode Offset Voltage Drift T
MIN
to T
MAX
●
16 μV/°C
IV
OCM
V
OCM
Input Current
●
515 μA
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E Pin
V
IL
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E Input Low Voltage
●
0.8 V
V
IH
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E Input High Voltage
●
2.4 V
I
IL
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E Input Low Current
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E = 0.8V
●
0.5 μA
I
IH
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E Input High Current
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E = 2.4V
●
1.2 3 μA
Power Supply
V
S
Operating Supply Range
●
2.85 3 3.5 V
I
S
Supply Current
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E = 0.8V
●
75 90 105 mA
I
SHDN
Shutdown Supply Current
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E = 2.4V
●
13 mA
PSRR Power Supply Rejection Ratio (Differential
Outputs)
V
+
= 2.85V to 3.5V
●
55 86 dB
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
+
= 3V, V
–
= 0V, +IN = –IN = V
OCM
= 1.25V,
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E = 0V, No R
L
unless
otherwise noted.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC6400IUD-20#TRPBF

Mfr. #:
Buy LTC6400IUD-20#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
High Speed Operational Amplifiers 3GHz Low Noise/Low Distortion Differential Amp
Lifecycle:
New from this manufacturer.
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