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LMH3401
LMH5401
LMH6401
Broad Market Device Overview
TI Confidential – NDA Restrictions
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LMH3401
7 GHz Bandwidth, Fixed Gain, Fully Differential Amplifier (FDA)
Features
• 3 dB bandwidth of 7 GHz @ 16 dB gain
• 18,000 V/us Slew Rate
• Optimized for single ended 50 Ω input to differential
conversion (DC to 7GHz active balun operation)
• Fully differential output on settable common mode voltage
• NF= 9 dB (Rs = 50 Ω) @ 1GHz, G=16dB, SE input
• Low distortion at max gain (2Vpp, 200 Ω, SE-DE):
 10 MHz: HD2 @ -96 dBc, HD3 @ -102 dBc
 500MHz HD2 @ -79 dBc; HD3 @ -77 dBc
 1 GHz: HD2 @ -64 dBc, HD3 @ -72 dBc
• OIP3 of 45 dBm @ 200MHz
• OIP3 of 33 dBm @ 1GHz and 24 dBm @ 2 GHz
• OIP2 of 71 dBm @ 1GHz and 56 dBm @ 2 GHz
• Supply operation from 3.3 to 5.0 V @ 56 mA
• Split supply operation supported
• Power down feature
• 2.5 x 2.5 mm2 14 lead QFN package
Applications
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Gig ADC Driver
Communications Receivers
IF / RF and baseband gain blocks
SAW filter Buffer/ Driver
Test and Measurement
Defense/Radar
Benefits
• Unprecedented usable bandwidth with excellent linearity
performance through 2GHz.
• Supports DC coupled operation, with either single or split
supply operation.
• Easy single-ended input to differential output conversion
without external baluns.(Active Balun configuration)
• Low power (280 mW on 5V supply) makes it attractive for a
variety of wide band, high dynamic range applications where
power and board space savings are desirable.
• LMH5401 external gain set version
LMH5401
8 GHz GBW Fully Differential Amplifier (FDA)
Features
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Gain bandwidth (GBW) of 8GHz
17,500 V/us Slew Rate
Gain >3dB (externally set)
Low harmonic distortion (2Vpp, 200Ω, G=12dB, DE-DE):
 100 MHz: HD2 @ -104dBc, HD3 @ -96dBc
 200 MHz: HD2 @ -95dBc, HD3 @ -92dBc
 500 MHz: HD2 @ -80dBc, HD3 @ -77dBc
 1 GHz: HD2 @ -64dBc, HD3 @ -58dBc
Low intermodulation distortion (2Vpp, 200Ω, G=12dB, DE-DE):
 100MHz: IMD2 @ -95dBc, IMD3 @ -95dBc
 200MHz: IMD2 @ -89dBc, IMD3 @ -91dBc
 500MHz: IMD2 @ -71dBc, IMD3 @ -75dBc
 1GHz: IMD2 @ -52dBc, IMD3 @ -60dBc
Output: 5.8Vpp on 5V supply
Supply operation from 3.3 to 5.0 V @ 55mA
Split supply operation supported
Power down
2.5 x 2.5 mm2 14 lead QFN package
Applications
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DAC output buffer
Gig ADC Driver
Communications Transmitter Signal Chain
IF / RF and baseband gain blocks
SAW filter Buffer/ Driver
Test and Measurement
Defense/Radar
Benefits
• Unprecedented usable bandwidth and application
flexibility DC to 2GHz.
• Excellent linearity performance through 1GHz
• Supports DC coupled operation, with either single
or split supply operation.
• Easy single-ended in to differential out conversion
without external baluns.
• Low power (280 mW on 5V supply) makes it
attractive for a variety of wide band, high dynamic
range applications where power and board space
savings are desirable.
LMH6401
4.5GHz, Variable Gain Amplifier (DVGA)
Features
Benefits
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• Unprecedented usable bandwidth with excellent linearity
performance through 2GHz.
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3 dB bandwidth of 4.5 GHz @ 26 dB gain
26 dB maximum voltage gain
32 dB gain range with 1 dB control step
Differential (100 Ω)
Differential output around adjustable common mode (Vocm)
8.0 dB NF @ 1 GHz at maximum gain
Low distortion at max gain (2Vpp, 200 Ω) :
 200 MHz: HD2 @ -73 dBc, HD3 @ -80 dBc
 500 MHz: HD2 @ -68 dBc, HD3 @ -72 dBc
 1 GHz: HD2 @ -63 dBc, HD3 @ -63 dBc
 2 GHz: HD2 @ -58 dBc, HD3 @ -54 dBc
OIP3 of 43 dBm @ 200MHz
OIP3 of 33 dBm @ 1GHz and 27 dBm @ 2 GHz
OIP2 of 60 dBm @ 1GHz and 52 dBm @ 2 GHz
SPI control with 1.8V compatible logic
Supply operation from 4 to 5.25 V @ 71 mA
Split supply capable
Fabricated on CBC8 Complementary SiGe process
3.0 x 3.0 mm2 16 lead QFN package
Applications
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Gig ADC Driver
Communications Receivers / AGC
IF / RF and baseband gain blocks
SAW filter Buffer/ Driver
Test and Measurement
Defense/Radar
• Differential DC coupled operation supported
• Low distortion single ended conversions from 50Ω source
using a 1:2 ratio input balun
• Low power (355mW on 5V supply) makes it attractive for a
variety of wide band, high signal fidelity applications where
power savings are desirable.
• Shutdown to 3mA offers added system power savings
LMH6401
ADA4961
LMH6401
Units
Bandwidth
3.2
4.5
GHz
Gain
-6 to 15
-6 to 26
dB
Noise Figure (max gain)
5.6
7.7
dB
Max output swing
5
5.8
Vpp
HD2/3 (500MHz)
-79/-80 @1.2Vpp
-68/-72 @ 2Vpp
dBc
HD2/3 (1.0GHz)
-79/-74 @1.2Vpp
-63/-63 @ 2Vpp
dBc
OIP3 (500MHz)
45.5
40
dBm
OIP3 (1.0GHz)
40
33
dBm
Slew Rate
12000
17400
V/us
Supply voltage
3.3/5
4/5
V
Current consumption
155/120
70
mA
Supports DC coupled
No
Yes
• Summary:
 ADA4961 is not suitable for DC coupled applications (won’t be suitable for T&M)
 Linearity and noise performance of ADA4961 is better as compared to LMH6401,
but LMH6401 power consumption is only 40%
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Variable Gain Amplifier – Digital
LMH6401
32dB gain range, 1dB
step
33dBm OIP3 @ 1GHz
4500MHz, QFN-16
4500
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Fully Differential Amplifiers
1
THS4541
2.7-5.4V, IQ=10.1mA
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TI Designs/Application: TIDA-00xxx
TSW54J60EVM
IF Sampling 1GSPS 16-bit ADC with Fully Differential Amplifier Reference Designs
Solution Features
Solution Benefits
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16-bit 1GSPS 2-ch ADC ADS54J60
• Ch A: 4.5GHz DVGA Fully Diff LMH6401
• Ch B: 7GHz Fully Diff Amplifier LMH3401
Clock Jitter Cleaner LMK04828
Complete TI Power Solution
400-MHz Low Pass Filter Design
TIDA-00xxx complete ref design files
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Reference design made from TI ADC, AMP,
CLK and Power components
Supports DC-coupled 400-MHz Bandwidth
Measure the board against your requirements
Copy TI‘s schematics and layout to get started
LMH6401
XFMR
Tools & Resources
AC-Coupled
• Compatible with
TSW14J56EVM
JESD204B capture card
• FMC standard width
DVGA
ADS54J60
400MHz
LPF
ADC
DC-Coupled
400MHz
LPF
FDA
1GHz Clock
LMH3401
TSW54J60EVM
TSW14J56EVM
OUTPUT
10Gbps
JESD204B
TO FPGA
CARD
TSW54J60EVM
TI Confidential – Maximum Restrictions
LMK04828
PLL
JITTER
CLEANER/
CLOCK
TI Designs/Application: TIDA-00431
TSW12J54EVM
RF Sampling 4GSPS ADC with 8GHz DC-Coupled Fully Diff Amplifier
Solution Features
Solution Benefits
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12-bit 4GSPS ADC ADC12J4000
8GHz Fully Differential Amplifier LMH5401
4.8GHz Low Phase Noise PLL/VCO TRF3765
Clock Jitter Cleaner LMK04828
Complete TI Power Solution
2GHz Butterworth Low Pass Filter Design
TIDA-00431 complete ref design files
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Reference design made from TI ADC, AMP,
PLL/VCO, CLK and Power components
Supports DC-coupled 2 GHz Bandwidth
Measure the board against your requirements
Copy TI‘s schematics and layout to get started
ADC12J4000
LMH5401
Tools & Resources
• Compatible with
TSW14J56EVM
JESD204B capture card
• FMC standard width
2GHz
LPF
INPUT
RF = DC – 2GHz
FDA
Voltage Gain = 4 V/V
SE-DIFF
TSW14J56EVM
4GHz Clock
PLL
TSW12J54EVM
TSW12J54EVM
TI Confidential – Maximum Restrictions
RF ADC
PLL
JITTER
CLEANER/
CLOCK
RF
PLL/VCO
LMK04828
TRF3765
OUTPUT
10Gbps
JESD204B
TO FPGA
CARD
Baluns vs Amplifiers
Balun
Amplifiers
Size
Large size (mostly ≥ 15mm2)
Small size (LMH3401/LMH5401: 6.25mm2)
DC coupled
Not suitable for DC coupled application
Suitable for DC coupled applications
Frequency response
Not suitable for wide bandwidth: Large
insertion loss and varies with frequency
Suitable for wide bandwidth: Minimal insertion loss
and almost constant across frequency
Power gain
No power gain
Supports power gain
- Impedance matching and voltage/current gain are
dependent
- Impedance matching and gain are independent
No buffering
Buffered
- Requirement on previous stage to drive filter and
ADC input load
- No reverse isolation
- Previous stage is isolated from filter and ADC input load
- Reverse isolation: Avoids ADC switching components
going back to previous stages (ex: antenna)
Distortion
Worse distortion due to phase unbalance
Better distortion with wideband amplifiers
Noise
Less noise (dependent on insertion loss)
Adds noise
Temperature range
Limited temp range (ex: -20 to 85C)
Large gain variation across temperature
Wide temp range (ex: -40 to 85C)
Small gain variation across temperature
Reliability
Less reliable due to mechanical construction
(ex: vibration during flight)
Reliable due to monolithic implementation
Buffering
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