ltc6401cud-8-trpbf Linear Technology Corporation, ltc6401cud-8-trpbf Datasheet

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ltc6401cud-8-trpbf

Manufacturer Part Number
ltc6401cud-8-trpbf
Description
1.3ghz Low Noise, Low Distortion Differential Adc Driver For 140mhz If
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
APPLICATIONS
TYPICAL APPLICATION
1.3GHz –3dB Bandwidth
Fixed Gain of 10V/V (20dB)
–93dBc IMD
–74dBc IMD
1nV/√ ⎯ H ⎯ z Internal Op Amp Noise
2.1nV/√ ⎯ H ⎯ z Total Input Noise
6.2dB Noise Figure
Differential Inputs and Outputs
200Ω Input Impedance
2.85V to 3.5V Supply Voltage
50mA Supply Current (150mW)
1V to 1.6V Output Common Mode Voltage,
Adjustable
DC- or AC-Coupled Operation
Max Differential Output Swing 4.4V
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
INPUT
66.5Ω
0.1μF + 1000pF
29Ω
3
3
0.1μF
0.1μF
Single-Ended to Differential ADC Driver
3.3V
at 70MHz (Equivalent OIP
at 140MHz (Equivalent OIP
+IN
–IN
ENABLE
V
+
LTC6401-20
V
OCM
V –
+OUT
–OUT
20dB GAIN
+OUTF
–OUTF
0.1μF
P-P
10Ω
10Ω
1.25V
3
3
= 50.5dBm)
= 41dBm)
AIN
AIN
LTC2208 130Msps
+
LTC2208
16-Bit ADC
V
CM
640120 TA01a
DESCRIPTION
3.3V
V
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 LTC6401-20 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 LTC6401-20 saves space and power compared to
alternative solutions using IF gain blocks and transform-
ers. The LTC6401-20 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.
DD
Distortion Differential ADC
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
1.3GHz Low Noise, Low
®
6401-20 is a high-speed differential amplifi er
Driver for 140MHz IF
70
60
50
40
30
20
10
0
Equivalent Output IP3 vs Frequency
0
50
FREQUENCY (MHz)
100
LTC6401-20
150
(NOTE 7)
640120 TA01b
200
640120f
1

Related parts for ltc6401cud-8-trpbf

ltc6401cud-8-trpbf Summary of contents

Page 1

... The LTC6401-20 is packaged in a compact 16-lead P-P 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. All other trademarks are the property of their respective owners. 1.25V 0.1μF 3.3V 10Ω ...

Page 2

... ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LTC6401CUD-20#PBF LTC6401CUD-20#TRPBF LTC6401IUD-20#PBF LTC6401IUD-20#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 G Gain Temperature Drift TEMP V Output Swing Low SWINGMIN V Output Swing High SWINGMAX V Maximum Differential Output Swing ...

Page 4

LTC6401-20 AC ELECTRICAL CHARACTERISTICS = 1.25V, ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0V fl oating, V OCM SYMBOL PARAMETER –3dBBW –3dB Bandwidth 0.1dBBW Bandwidth for 0.1dB Flatness 0.5dBBW Bandwidth for 0.5dB ...

Page 5

AC ELECTRICAL CHARACTERISTICS = 1.25V, ⎯ E ⎯ N ⎯ A ⎯ B ⎯ L ⎯ 0V fl oating, V OCM SYMBOL PARAMETER IMD Third-Order Intermodulation 3,140M (f1 = 139.5MHz f2 = 140.5MHz) OIP Third-Order Output ...

Page 6

LTC6401-20 TYPICAL PERFORMANCE CHARACTERISTICS Input and Output Refl ection and Reverse Isolation vs Frequency 0 TEST CIRCUIT B –10 –20 S11 –30 S22 –40 –50 S12 –60 –70 –80 10 100 1000 3000 FREQUENCY (MHz) 640120 G04 Noise Figure and ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS Harmonic Distortion (Unfi ltered) vs Frequency –40 DIFFERENTIAL INPUT OUT P-P –50 –60 –70 –80 –90 –100 HD2 HD2 200Ω R –110 HD3 HD3 200Ω R –120 0 ...

Page 8

LTC6401-20 TYPICAL PERFORMANCE CHARACTERISTICS Equivalent Output Third Order Intercept vs Frequency 70 UNFILTERED UNFILTERED 200Ω FILTERED DIFFERENTIAL INPUT COMPOSITE OUT P-P (NOTE 7) ...

Page 9

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 the ...

Page 10

LTC6401-20 APPLICATIONS INFORMATION Circuit Operation The LTC6401- low noise and low distortion fully differential op amp/ADC driver with: • Operation from DC to 1.3GHz –3dB bandwidth impedance • Fixed gain of 10V/V (20dB) • Differential input impedance 200Ω ...

Page 11

APPLICATIONS INFORMATION R S 0.1μF 50Ω 100Ω 1000Ω – IN+ OUT– 66.5Ω 14 +IN 0.1μF 15 –IN IN– OUT 0.1μF 1000Ω 50Ω 100Ω 16 – 66.5Ω Figure 3. Input ...

Page 12

LTC6401-20 APPLICATIONS INFORMATION Output Common Mode Adjustment The LTC6401-20’s output common mode voltage is set by the V pin, which is a high impedance input. The OCM output common mode voltage is capable of tracking range from ...

Page 13

APPLICATIONS INFORMATION Top Silkscreen LTC6401-20 640120f 13 ...

Page 14

... V CC C10 C9 C12 0.1μF 1000pF 1000pF R19 1.5k C7 0.1μF C23 C5 0.1μF 0.1μF R21 (1) C24 C6 0.1μF 0.1μ LTC6401CUD-20 OPEN OPEN MINI-CIRCUITS TCM4-19 (1:4) C18 0.1μF R10 R14 86.6Ω ( TCM 4- (1) 0.1μF 1:4 2 SL2 R7 (2) ( 0.1μF 86.6Ω R13 C22 0Ω ...

Page 15

... RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 16

... SNR = 82dB at 3V Supply, 4th Order Filter SNR = 82dB at 3V Supply, 4th Order Filter SNR = 76dB at 3V Supply, 4th Order Filter SNR = 76dB at 3V Supply, 4th Order Filter www.linear.com ● = –65dBc at 300MHz – 640120f LT 0907 • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2007 ...

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