LTC6401CUD-14-PBF LINER [Linear Technology], LTC6401CUD-14-PBF Datasheet

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LTC6401CUD-14-PBF

Manufacturer Part Number
LTC6401CUD-14-PBF
Description
2GHz Low Noise, Low Distortion Differential ADC Driver for DC-140MHz
Manufacturer
LINER [Linear Technology]
Datasheet
FEATURES
APPLICATIONS
TYPICAL APPLICATION
0.1μF
C2
V
2GHz –3dB Bandwidth
Fixed Gain of 5V/V (14dB)
–91dBc IMD3 at 70MHz (Equivalent OIP3 = 49.3dBm)
–81dBc IMD3 at 140MHz (Equivalent OIP3 = 44.5dBm)
1.1nV/√ ⎯ H ⎯ z Internal Op Amp Noise
7.3dB Noise Figure
Differential Inputs and Outputs
200Ω 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
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
IN
68.5Ω
R1
29Ω
1000pF
R2
C1
0.1μF
0.1μF
C3
C4
3.3V
+IN
–IN
V
+
V –
LTC6401-14
V
OCM
+OUT
–OUT
1.25V
C5
0.1μF
COILCRAFT
0603CS
P-P
100Ω
15Ω
15Ω
R
R
R3
S1
S2
24nH
L1
C
33pF
C
33pF
C
33pF
F2
F1
F3
10Ω
10Ω
R
R
S3
S4
DESCRIPTION
The LTC
targeted 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 LTC6401-14 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 14dB (5V/V).
The LTC6401-14 saves space and power compared to
alternative solutions using IF gain blocks and transform-
ers. The LTC6401-14 is packaged in a compact 16-lead
3mm × 3mm QFN package and operates over the –40°C
to 85°C temperature range.
All other trademarks are the property of their respective owners.
16-Bit ADC
LTC2208
130Msps
Distortion Differential ADC
AIN
AIN
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
+
LTC2208
3.3V
V
V
DD
CM
®
6401-14 is a high-speed differential amplifi er
640114 TA01a
2GHz Low Noise, Low
Driver for DC-140MHz
60
50
40
30
20
10
0
Equivalent Output IP3 vs Frequency
0
20 40 60 80
LTC6401-14
FREQUENCY (MHz)
100 120 140 160 180
(NOTE 7)
640114 TA01b
640114f
1
200

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LTC6401CUD-14-PBF Summary of contents

Page 1

FEATURES 2GHz –3dB Bandwidth ■ Fixed Gain of 5V/V (14dB) ■ ■ –91dBc IMD3 at 70MHz (Equivalent OIP3 = 49.3dBm) –81dBc IMD3 at 140MHz (Equivalent OIP3 = 44.5dBm) ■ 1.1nV/√ ⎯ H ⎯ z Internal Op Amp Noise ■ ■ ...

Page 2

... ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LTC6401CUD-14#PBF LTC6401CUD-14#TRPBF LTC6401IUD-14#PBF LTC6401IUD-14#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. Consult LTC Marketing for information on non-standard lead based fi nish parts. ...

Page 3

DC ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T otherwise noted. SYMBOL PARAMETER Input/Output Characteristic G Gain DIFF TC Gain Temperature Drift GAIN V Output Swing Low SWINGMIN V Output Swing High SWINGMAX V Maximum Differential Output Swing ...

Page 4

LTC6401-14 AC ELECTRICAL CHARACTERISTICS ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0V unless otherwise noted. L SYMBOL PARAMETER –3dBBW –3dB Bandwidth 0.5dBBW Bandwidth for 0.5dB Flatness 0.1dBBW Bandwidth for 0.1dB Flatness 1/f ...

Page 5

AC ELECTRICAL CHARACTERISTICS ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0V unless otherwise noted. L SYMBOL PARAMETER 140MHz Input Signal HD2,140M/ Second/Third Order Harmonic Distortion V HD3,140M IMD3,140M Third-Order Intermodulation (f1 = ...

Page 6

LTC6401-14 TYPICAL PERFORMANCE CHARACTERISTICS Input and Output Refl ection and Reverse Isolation vs Frequency 0 TEST CIRCUIT B –10 –20 S11 –30 S22 –40 –50 –60 S12 –70 –80 10 100 1000 3000 FREQUENCY (MHz) 640114 G04 Noise Figure and ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS Third Order Intermodulation Distortion vs Frequency –40 DIFFERENTIAL INPUT COMPOSITE OUT P-P –50 –60 200Ω –70 – –90 –100 –110 100 120 140 160 ...

Page 8

LTC6401-14 PIN FUNCTIONS + V (Pins 1, 3, 10): Positive Power Supply (Normally tied 3.3V). All three pins must be tied to the same voltage. Bypass each pin with 1000pF and 0.1μF capaci- tors as close to ...

Page 9

APPLICATIONS INFORMATION Circuit Operation The LTC6401- low noise and low distortion fully differential op amp/ADC driver with: • Operation from DC to 2GHz –3dB bandwidth • Fixed gain of 5V/V (14dB) • Differential input impedance 200Ω • Differential ...

Page 10

LTC6401-14 APPLICATIONS INFORMATION Referring to Figure 3, LTC6401-14 can be easily confi gured for single-ended input and differential output without a balun. The signal is fed to one of the inputs through a matching network while the other input is ...

Page 11

APPLICATIONS INFORMATION only a few components as shown in Figure 6. Three 39pF capacitors and a 16nH inductor create a bandpass fi lter with 165MHz center frequency, –3dB frequencies at 138MHz and 200MHz. LTC6401-14 500Ω 200Ω 12.5Ω 13 +IN +OUT ...

Page 12

LTC6401-14 APPLICATIONS INFORMATION Test Circuits Due to the fully-differential design of the LTC6401 and its usefulness in applications with differing characteristic specifi cations, two test circuits are used to generate the information in this datasheet. Test Circuit A is DC987B, ...

Page 13

... V CC C10 C9 C12 0.1μF 1000pF 1000pF C7 0.1μF C23 C5 0.1μF 0.1μF R21 R22 (1) (1) C24 C6 0.1μF 0.1μ SL1 -F LTC6401CUD-14 MINI-CIRCUITS TCM4-19 (1:4) 6dB LTC6401-14 C18 0.1μF R10 R14 86.6Ω ( TCM 4: (1) 0.1μF 1:4 2 SL2 R7 (2) ( 0.1μF 86.6Ω ...

Page 14

LTC6401-14 TYPICAL APPLICATIONS PORT 1 (50Ω) 0.1μF 1/2 AGILENT 200Ω E5O71A PORT 2 (50Ω) 0.1μF 14 Test Circuit B, 4-Port Analysis + V 1000pF 0.1μF V – + ENABLE BIAS CONTROL ...

Page 15

PACKAGE DESCRIPTION 3.50 ± 0.05 1.45 ± 0.05 2.10 ± 0.05 (4 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 3.00 ± 0.10 PIN 1 TOP MARK (NOTE 6) NOTE: 1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WEED-2) 2. ...

Page 16

LTC6401-14 RELATED PARTS PART NUMBER DESCRIPTION High-Speed Differential Amplifi ers/Differential Op Amps LT ® 1993-2 800MHz Differential Amplifi er/ADC Driver LT1993-4 900MHz Differential Amplifi er/ADC Driver LT1993-10 700MHz Differential Amplifi er/ADC Driver LT1994 Low Noise, Low Distortion Differential Op Amp ...

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