ltc6401-26 Linear Technology Corporation, ltc6401-26 Datasheet

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ltc6401-26

Manufacturer Part Number
ltc6401-26
Description
1.6ghz Low Noise, Low Distortion Differential Adc Driver For Dc-140mhz
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
APPLICATIONS
TYPICAL APPLICATION
0.1μF
V
1.6GHz –3dB Bandwidth
Fixed Gain of 20V/V (26dB)
–85dBc IMD3 at 70MHz (Equivalent OIP3 = 46.5dBm)
–72dBc IMD3 at 140MHz (Equivalent OIP3 = 40dBm)
1nV/√ ⎯ H ⎯ z Internal Op Amp Noise
1.5nV/√ ⎯ H ⎯ z Total Input Referred Noise
6.8dB Noise Figure
Differential Inputs and Outputs
50Ω 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 4.7V
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
150Ω
37.4Ω
1000pF
Single-Ended to Differential ADC Driver at 140MHz IF
0.1μF
0.1μF
3.3V
+IN
–IN
V
+
LTC6401-26
V –
LTC6401-26
V
V
OCM
OCM
+OUT
–OUT
1.25V
0.1μF
COILCRAFT
0603CS
P-P
100Ω
15Ω
15Ω
24nH
L1
33pF
33pF
33pF
10Ω
10Ω
16-BIT ADC
130Msps
LTC2208
DESCRIPTION
ADC Driver for DC-140MHz
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 LTC6401-26 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 of transformers or AC-coupling ca-
pacitors in many applications. The gain is internally fi xed
at 26dB (20V/V).
The LTC6401-26 saves space and power compared to
alternative solutions using IF gain blocks and transform-
ers. The LTC6401-26 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.
AIN
AIN
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Low Distortion Differential
+
LTC2208
3.3V
V
V
DD
CM
®
6401-26 is a high-speed differential amplifi er
640126 TA01a
1.6GHz Low Noise,
60
50
40
30
20
10
0
0
Equivalent OIP3 vs Frequency
50
LTC6401-26
FREQUENCY (MHz)
100
DIFFERENTIAL INPUT
(NOTE 7)
150
NO R
R
L
640126 TA01b
= 200Ω
L
640126f
1
200

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ltc6401-26 Summary of contents

Page 1

... The LTC6401-26 saves space and power compared to alternative solutions using IF gain blocks and transform- P-P ers. The LTC6401-26 is packaged in a compact 16-lead 3mm × 3mm QFN package and operates over the –40°C to 85°C temperature range. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ...

Page 2

... LTC6400 AND LTC6401 SELECTOR GUIDE PART NUMBER GAIN (dB) LTC6401-8 LTC6401-20 20 LTC6401-26 26 LTC6400-20 20 LTC6400- 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 low distortion of the LTC6400 comes at the expense of higher power consumption. Please refer to the separate LTC6400 data sheets for complete details ...

Page 3

... E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 2.4V ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0V, Both Inputs and Outputs Floating ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 3V, Both Inputs and Outputs Floating 2.85V to 3.5V LTC6401-26 = 1.25V, ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0V unless OCM L MIN ...

Page 4

... LTC6401-26 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 1/f Noise Corner SR Slew Rate t 1% Settling Time S1% t Overdrive Recovery Time OVDR ...

Page 5

... Note 5: Input and output baluns used. See Test Circuit A. Note 6: Measured using Test Circuit B. R Note 7: Since the LTC6401- feedback amplifi er with low output impedance, a resistive load is not required when driving an AD converter. Therefore, typical output power is very small. In order to compare the LTC6401-26 with amplifi ...

Page 6

... LTC6401-26 TYPICAL PERFORMANCE CHARACTERISTICS Frequency Response TEST CIRCUIT 100 FREQUENCY (MHz) S21 Phase and Group Delay vs Frequency 0 –50 –100 PHASE –150 –200 0 200 400 600 FREQUENCY (MHz) Input and Output Impedance vs Frequency 180 Z MAG IN Z MAG OUT ...

Page 7

... TEST CIRCUIT 640126 G09 Harmonic Distortion vs Frequency –40 –50 –60 –70 –80 –90 –100 –110 640126 G11 LTC6401-26 = 87.5Ω PER OUTPUT L +OUT –OUT TIME (ns) 640126 G08 = 87.5Ω PER OUTPUT L –OUT +OUT 50 100 150 200 250 TIME (ns) ...

Page 8

... LTC6401-26 TYPICAL PERFORMANCE CHARACTERISTICS Third Order Intermodulation Distortion vs Frequency –40 DIFFERENTIAL INPUT COMPOSITE OUT P-P –50 –60 –70 –80 –90 –100 200Ω L –110 0 50 100 150 FREQUENCY (MHz) 640126 G13 Output 1dB Compression Point vs Frequency 19.0 DIFFERENTIAL INPUT R = 375Ω ...

Page 9

... R FILT 50Ω IN+ OUT– FILT 2.7pF 50Ω IN– OUT OUT 25Ω 500Ω 12.5Ω 2k COMMON MODE CONTROL 5.3pF – OCM LTC6401-26 – . The Exposed Pad must be +OUT 8 +OUTF 7 FILT –OUTF 6 –OUT 5 640126 BD 640126f 9 ...

Page 10

... Moreover, they offer single-ended 50Ω matching in wideband applications and no external resistor is needed. The LTC6401-26 is very fl exible in terms of I/O coupling. It can be AC- or DC-coupled at the inputs, the outputs or both. Due to the internal connection between input and output, users are advised to keep input common mode voltage between 1V and 1 ...

Page 11

... R 25Ω L –OUT 5 16 –IN 640126 F04 Figure 5. LTC6401-26 Internal Filter Topology Modifi ed for Low Filter Bandwidth (Three External Capacitors) LTC6401-26 pin, which is a high impedance input. The control is OCM pin and is aimed to reduce com- OCM pin should be tied ...

Page 12

... LTC6401-26 is connected 1.25V. Alternatively, a single-ended input signal can be converted to a differential signal via a balun and fed to the input of the LTC6401-26. Figure 8 summarizes the IMD3 performance of the whole system as shown in Figure 7. Test Circuits Due to the fully-differential design of the LTC6401 and its usefulness in applications with differing characteristic specifi ...

Page 13

... 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 LTC6401UD-26 OPEN OPEN M/A-COM MABA-007159-000000 LTC6401-26 C18 0.1μF R10 R14 86.6Ω (1) R12 TCM 4:19 4 (1) 0.1μF 1:4 2 SL2 R7 R11 (2) ( 0.1μF 86.6Ω ...

Page 14

... LTC6401-26 TYPICAL APPLICATION +IN 24.9Ω PORT 1 (50Ω) 0.1μF +IN 1/2 AGILENT –IN E5O71A –IN 24.9Ω PORT 2 (50Ω) 0.1μF 1000pF 14 Test Circuit B, 4-Port Analysis + V 1000pF 0.1μF V – + ENABLE BIAS CONTROL OUT 500Ω 25Ω 12.5Ω FILT 50Ω IN+ OUT– ...

Page 15

... Plastic QFN (3mm × 3mm) (Reference LTC DWG # 05-08-1691) 0.70 ±0.05 PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC 0.75 ± 0.05 (4 SIDES) 1.45 ± 0.10 (4-SIDES) 0.200 REF 0.00 – 0.05 LTC6401-26 BOTTOM VIEW—EXPOSED PAD PIN 1 NOTCH R = 0.20 TYP R = 0.115 OR 0.25 × 45° CHAMFER TYP 15 16 0.40 ± 0. (UD16) QFN 0904 0.25 ± 0.05 ...

Page 16

... LTC6401-26 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 LT5514 Ultralow Distortion IF Amplifi ...

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