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LTC6401IUD-8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC6401-8
1
64018f
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
2.2GHz Low Noise, Low
Distortion Differential ADC
Driver for DC-140MHz
The LTC
®
6401-8 is a high-speed differential amplifi er tar-
geted at processing signals from DC to 140MHz. 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 LTC6401-8 is easy to use, with minimal support cir-
cuitry 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 8dB (2.5V/V).
The LTC6401-8 saves space and power compared to al-
ternative solutions using IF gain blocks and transformers.
The LTC6401-8 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
■
2.2GHz –3dB Bandwidth
■
Fixed Gain of 2.5V/V (8dB)
■
–92dBc IMD3 at 70MHz (Equivalent OIP3 = 50dBm)
■
–80.5dBc IMD3 at 140MHz (Equivalent OIP3 = 44dBm)
■
1nV/√
⎯
H
⎯
z Internal Op Amp Noise
■
12.1dB Noise Figure
■
Differential Inputs and Outputs
■
400Ω Input Impedance
■
2.85V to 3.5V Supply Voltage
■
45mA Supply Current (135mW)
■
1V to 1.6V Output Common Mode, Adjustable
■
DC- or AC-Coupled Operation
■
Max Differential Output Swing 4.6V
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.
R2
27.4Ω
R1
59.0Ω
C4
0.1μF
C3
0.1μF
64018 TA01a
LTC6401-8
LTC2208
R
S1
15Ω
C2
0.1μF
V
IN
C1
1000pF
3.3V3.3V
R
S2
15Ω
R
S3
10Ω
R
S4
10Ω
R3
100Ω
V
OCM
C5
0.1μF
1.25V
C
F2
33pF
COILCRAFT
0603CS
C
F1
33pF
L1
24nH
C
F3
33pF
V
+
–IN
+IN
+OUT
–OUT
V
–
AIN
+
AIN
–
V
CM
V
DD
LTC2208
130Msps
16-Bit ADC
0 100 120 140 160 18020 40 60 80 200
FREQUENCY (MHz)
OUTPUT IP3 (dBm)
60
50
40
20
10
30
0
64018 TA01b
(NOTE 7)
LTC6401-8
2
64018f
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
– V
EE
) ......................................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
(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
= 150°C, θ
JA
= 68°C/W, θ
JC
= 4.2°C/W
EXPOSED PAD (PIN 17) IS V
–
, MUST BE SOLDERED TO PCB
LTC6400 AND LTC6401 SELECTOR GUIDE
PART NUMBER GAIN
(dB)
GAIN
(V/V)
Z
IN
(DIFFERENTIAL)
(Ω)
I
CC
(mA)
LTC6401-8 8 2.5 400 45
LTC6401-20 20 10 200 50
LTC6401-26 26 20 50 45
LTC6400-20 20 10 200 90
LTC6400-26 26 20 50 85
In addition to the LTC6401 family of amplifi ers, a lower distortion LTC6400 family is available. The LTC6400 is pin compatible to the LTC6401, and has the
same low noise performance. The LTC6400 shows higher linearity especially at input frequency above 140MHz at the expense of higher supply current.
Please refer to the separate LTC6400 data sheets for complete details. Other gain versions from 8dB to 14dB will follow.
ORDER INFORMATION
Please check each datasheet for complete details.
PIN CONFIGURATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LTC6401CUD-8#PBF LTC6401CUD-8#TRPBF LCCY 16-Lead (3mm × 3mm) Plastic QFN 0°C to 70°C
LTC6401IUD-8#PBF LTC6401IUD-8#TRPBF LCCY 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/
LTC6401-8
3
64018f
DC ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Input/Output Characteristic
G
DIFF
Gain V
IN
= ±400mV Differential
●
7.5 8 8.5 dB
TC
GAIN
Gain Temperature Drift V
IN
= ±400mV Differential
●
–0.5 mdB/°C
V
SWINGMIN
Output Swing Low Each Output, V
IN
= ±1.6V Differential
●
89 170 mV
V
SWINGMAX
Output Swing High Each Output, V
IN
= ±1.6V Differential
●
2.3 2.42 V
V
OUTDIFFMAX
Maximum Differential Output Swing 1dB Compressed
●
4.6 V
P-P
I
OUT
Output Current Drive V
OUT
> 2V
P-P,DIFF
●
10 mA
V
OS
Input Offset Voltage Differential
●
–4 4 mV
TCV
OS
Input Offset Voltage Drift Differential
●
3 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
●
340 400 460
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
●
36 55 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
●
5 μV/°C
IV
OCM
V
OCM
Input Current
●
3.6 15 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
●
1.4 4 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, Input and Output Floating
●
36 45 60 mA
I
SHDN
Shutdown Supply Current
⎯
E
⎯
N
⎯
A
⎯
B
⎯
L
⎯
E = 2.4V, Input and Output Floating
●
0.8 3 mA
PSRR Power Supply Rejection Ratio
(Differential Outputs)
V
+
= 2.85V to 3.5V
●
50 73.5 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.
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LTC6401IUD-8#PBF

Mfr. #:
Buy LTC6401IUD-8#PBF
Manufacturer:
Analog Devices Inc.
Description:
High Speed Operational Amplifiers 3GHz Low Noise/Low Distortion Differential Amp
Lifecycle:
New from this manufacturer.
Delivery:
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