LTC6420CUDC-20-PBF LINER [Linear Technology], LTC6420CUDC-20-PBF Datasheet

no-image

LTC6420CUDC-20-PBF

Manufacturer Part Number
LTC6420CUDC-20-PBF
Description
Dual Matched 1.8GHz Differential Amplifi ers/ADC Drivers
Manufacturer
LINER [Linear Technology]
Datasheet
FEATURES
APPLICATIONS
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
TYPICAL APPLICATION
V
V
IN
IN
Matched Dual Amplifi er with Output Common Mode Biasing
Matched Gain ±0.1dB
Matched Phase ±0.1° at 100MHz
Channel Separation 80dB at 100MHz
1.8GHz –3dB Bandwidth; Fixed Gain of 10V/V (20dB)
IMD3 = –84dBc at 100MHz, 2V
Equivalent OIP3 = 46dBm at 100MHz
1nV/√Hz Internal Op Amp Noise
6.2dB Noise Figure
Differential Inputs and Outputs
Rail-to-Rail Output Swing
80mA Supply Current (240mW) per Amplifi er
1.1V to 1.6V Output Common Mode Voltage,
Adjustable
DC- or AC-Coupled Operation
20-Lead 3mm × 4mm × 0.75mm QFN Package
Differential ADC Driver
Differential Driver/Receiver
Single Ended to Differential Conversion
IF Sampling (Diversity) Receivers
A
B
Z
Z
0.1μF
0.1μF
0.1μF
0.1μF
IN
IN
= 200Ω
= 200Ω
V–
–IN A
+IN A
+IN B
–IN B
0.1μF
0.1μF
LTC6420-20
V+ A
V+ B
100Ω
100Ω
100Ω
100Ω
3V
3V
1000pF
1000pF
+
+
V
V
V
V
1000Ω
1000Ω
1000Ω
1000Ω
OCM
OCM
OCM
OCM
A
A
B
B
ENABLEA
ENABLEB
12.5Ω
12.5Ω
12.5Ω
12.5Ω
P-P
+OUT A
–OUT A
– OUT B
+OUT B
V–
±0.1dB GAIN MATCHING
±0.1° PHASE MATCHING AT 100MHz
V
V
V
V
OCM
OCM
OCM
OCM
A
A
B
B
642020 TA01a
DESCRIPTION
The LTC
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 LTC6420-20 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
capacitors in many applications. The gain is internally
fi xed at 20dB (10V/V).
The LTC6420-20 saves space and power compared to
alternative solutions using IF gain blocks and transformers.
The LTC6420-20 is packaged in a compact 20-lead
3mm × 4mm QFN package and operates over the –40°C
to 85°C temperature range.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
®
6420-20 is a dual high-speed differential amplifi er
Amplifi ers/ADC Drivers
40
35
30
25
20
15
10
5
0
– 0.25
Distribution of Gain Match
1.8GHz Differential
CHANNEL-TO-CHANNEL GAIN MATCH (dB)
– 0.15
– 0.05
Dual Matched
0.05
LTC6420-20
0.15
642020 TA01b
0.25
642020fa
1

Related parts for LTC6420CUDC-20-PBF

LTC6420CUDC-20-PBF Summary of contents

Page 1

FEATURES n Matched Gain ±0.1dB n Matched Phase ±0.1° at 100MHz n Channel Separation 80dB at 100MHz n 1.8GHz –3dB Bandwidth; Fixed Gain of 10V/V (20dB) n IMD3 = –84dBc at 100MHz, 2V P-P n Equivalent OIP3 = 46dBm at ...

Page 2

... ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LTC6420CUDC-20#PBF LTC6420CUDC-20#TRPBF LDDM LTC6420IUDC-20#PBF LTC6420IUDC-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 ΔG Gain Matching TC Gain Temperature Drift GAIN V Output Swing Low (V = 1.5V) SWINGMIN OCM V Output Swing ...

Page 4

LTC6420-20 AC ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER ΔG Gain Matching ΔP Phase Matching Channel Separation (Note 8) –3dBBW –3dB Bandwidth 0.5dBBW Bandwidth for 0.5dB Flatness 0.1dBBW Bandwidth for 0.1dB Flatness NF Noise Figure ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Channel to Channel Gain Match vs Frequency 0.5 0.4 0.3 0.2 0.1 0.0 –0.1 –0.2 –0.3 –0.4 –0.5 10 100 1000 2000 FREQUENCY (MHz) 642020 G01 Frequency Response 100 FREQUENCY ...

Page 6

LTC6420-20 TYPICAL PERFORMANCE CHARACTERISTICS Noise Figure and Input Referred Noise Voltage vs Frequency NOISE FIGURE 100 1000 FREQUENCY (MHz) 642020 G08 ...

Page 7

PIN FUNCTIONS +INA, –INA, –INB, +INB (Pins 6): Differential Inputs of A and B channel respectively. – V (Pins 3, 4, 13, 14, 21): Negative Power Supply. All four pins, as well as the exposed back, must ...

Page 8

LTC6420-20 APPLICATIONS INFORMATION Circuit Operation Each of the two channels of the LTC6420-20 is composed of a fully differential amplifi er with on chip feedback and output common mode voltage control circuitry. Differential gain and input impedance are set by ...

Page 9

APPLICATIONS INFORMATION matching network while the other input is connected to the same matching network and a source resistor. Because the return ratios of the two feedback paths are equal, the two outputs have the same gain and thus symmetrical ...

Page 10

... C35 C39 C32 [1] C32 J6 0.1μF 0.1μ 1000pF –OUTB R12 2 R14 88.7 [1] C40 1 5 0.1μF J8 TCM4-19+ R15 1 2 +OUTB C44 88.7 C41 0.1μF [1] VERSION U1 R5, R9, R10, R13 T1, T3 –C LTC6420CUDC-20 NONE TCM4-19+ –G LTC6421CUDC-20 NONE TCM4-19+ 642020 F04b 642020fa ...

Page 11

TYPICAL APPLICATIONS Test Circuit B, 4-Port Measurements (Only the Signal-Path Connections Are Shown) 0.1μ PORT 1000Ω G +INA (50Ω) 100Ω 12.5Ω – + – 200Ω –INA AGILENT 100Ω 12.5Ω + ...

Page 12

LTC6420-20 TYPICAL APPLICATION Dual ADC Driver for Wideband Direct-Conversion Receivers C1 0.1μF + – 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 ...

Related keywords