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LMH5401
SBOS710B –OCTOBER 2014–REVISED JANUARY 2015
LMH5401 8-GHz, Low-Noise, Low-Power, Fully-Differential Amplifier
1 Features
3 Description
The LMH5401 is a very high-performance, differential
amplifier optimized for radio frequency (RF),
intermediate frequency (IF), or high-speed, dc-
coupled, time-domain applications. The device is
ideal for dc- or ac-coupled applications that may
1
•
Gain Bandwidth Product (GBP): 8 GHz
•
Excellent Linearity Performance:
DC to 2 GHz, G = 12 dB
•
•
Slew Rate: 17,500 V/µs
require
a
single-ended-to-differential
(SE-DE)
Low HD2, HD3 Distortion
conversion when driving an analog-to-digital
converter (ADC). The LMH5401 generates very low
levels of second- and third-order distortion when
operating in SE-DE or differential-to-differential (DE-
DE) mode.
(1 VPP, 200 Ω, DE-DE, G = 12 dB):
–
–
–
–
100 MHz: HD2 at –104 dBc, HD3 at –96 dBc
200 MHz: HD2 at –95 dBc, HD3 at –92 dBc
500 MHz: HD2 at –80 dBc, HD3 at –77 dBc
1 GHz: HD2 at –64 dBc, HD3 at –58 dBc
The amplifier is optimized for use in both SE-DE and
DE-DE systems. The device has unprecedented
usable bandwidth from dc to 2 GHz. The LMH5401
can be used for SE-DE conversions in the signal
chain without external baluns in a wide range of
applications such as test and measurement,
broadband communications, and high-speed data
acquisition.
•
Low IMD2, IMD3 Distortion
(2 VPP, 200 Ω, DE-DE, G = 12 dB):
–
–
–
200 MHz: IMD2 at –96 dBc, IMD3 at –95 dBc
500 MHz: IMD2 at –80 dBc, IMD3 at –83 dBc
1 GHz: IMD2 at –70 dBc, IMD3 at –63 dBc
•
•
•
•
•
Input Voltage Noise: 1.25 nV/√Hz
Input Current Noise: 3.5 pA/√Hz
Supports Single- and Dual-Supply Operation
Power Consumption: 55 mA
A common-mode reference input pin is provided to
align the amplifier output common-mode with the
ADC input requirements. Power supplies between
3.3 V and 5.0 V can be selected and dual-supply
operation is supported when required by the
application. A power-down feature is also available
for power savings.
Power-Down Feature
2 Applications
This level of performance is achieved at a very low
power level of 275 mW when a 5.0-V supply is used.
The device is fabricated in Texas Instruments'
advanced complementary BiCMOS process and is
available in a space-saving, UQFN-14 package for
higher performance.
•
•
•
•
•
•
•
•
GSPS ADC Drivers
ADC Drivers for High-Speed Data Acquisition
ADC Drivers for 1-GBPS Ethernet over Microwave
DAC Buffers
IF, RF, and Baseband Gain Blocks
SAW Filter Buffers and Drivers
Balun Replacement DC to 2 GHz
Level Shifters
Device Information(1)
DEVICE NAME
LMH5401
PACKAGE
BODY SIZE
UQFN (14)
2.50 mm × 2.50 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Distortion versus Frequency
(G = 12 dB, SE-DE, RL = 200 Ω, VPP = 2 V)
0
LMH5401 Driving an ADC12J4000
HD2
HD3
±20
RT
50-:,
FB+
IN-
25 :
RF
Single-Ended
OUT+ RO
10 :
OUT_AMP
10 :
Input
RG
±40
±60
ꢀꢀ
+
ꢀ
+
ꢀ
IN+
IN-
LMH5401
Filter
RO
ADC
IN+
FB-
RG+RM
RF
OUTꢀ
25 :
±80
CM
±100
±120
10
100
1k
Frequency (MHz)
C014
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.