LMH6401_16 Datasheet, PDF (1/48 Pages) Texas Instruments – LMH6401 DC to 4.5 GHz, Fully-Differential, Digital Variable-Gain Amplifier

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LMH6401
SBOS730A – APRIL 2015 – REVISED MAY 2015
LMH6401 DC to 4.5 GHz, Fully-Differential, Digital Variable-Gain Amplifier
1 Features
•1 3-dB Bandwidth: 4.5 GHz at 26-dB Gain
• Gain Range: –6 dB to 26 dB in 1-dB Steps
• Differential Input Impedance: 100 Ω
• Differential Output with Common-Mode Control
• Distortion at Max Gain (V_O = 2 V_PPD, R_L = 200 Ω):
– 200 MHz: HD2 at –73 dBc, HD3 at –80 dBc
– 500 MHz: HD2 at –68 dBc, HD3 at –72 dBc
– 1 GHz: HD2 at –63 dBc, HD3 at –63 dBc
– 2 GHz: HD2 at –58 dBc, HD3 at –54 dBc
• Output IP3:
– 43 dBm at 200 MHz
– 33 dBm at 1 GHz
– 27 dBm at 2 GHz
• Output IP2:
– 67 dBm at 200 MHz
– 60 dBm at 1 GHz
– 52 dBm at 2 GHz
• 8-dB Noise Figure at 1 GHz, R_S = 100 Ω
• 82-ps Rise, Fall Time Pulse Response
• Supply Operation: 5.0 V at 69 mA
• Supports Single- and (±) Split-Supply Operation:
– DC- and AC-Coupled Applications
• Fabricated on an Advanced Complementary
BiCMOS Process
• 3-mm × 3-mm UQFN-16 Package
2 Applications
• Test and Measurement
• Ultra-Wideband ADC Drivers
• Communications Receivers
• RF Sampling Subsystems
• SAW Filter Buffers and Drivers
• Defense and Radar
3 Description
The LMH6401 is a wideband, digitally-controlled,
variable-gain amplifier (DVGA) designed for dc to
radio frequency (RF), intermediate frequency (IF),
and high-speed time-domain applications. The device
is an ideal analog-to-digital converter (ADC) driver for
dc- or ac-coupled applications that require an
automatic gain control (AGC).
Noise and distortion performance is optimized to drive
ultra-wideband ADCs. The amplifier has an 8-dB
noise figure at maximum gain and a –63-dBc
harmonic distortion at 1 GHz for full-scale signal
levels. The device supports both single- and split-
supply operation for driving an ADC. A common-
mode reference input pin is provided to align the
amplifier output common-mode with the ADC input
requirements.
Gain control is performed via an SPI™ interface,
allowing a 32-dB gain range from –6 dB to 26 dB in
1-dB steps. A power-down feature is also available
through the external PD pin or SPI control.
This level of performance is achieved at a low power
level of 345 mW. The operating ambient temperature
range is –40°C to 85°C.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LMH6401
UQFN (16)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Harmonic Distortion vs Frequency (V_O = 2 V_PPD)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
10
HD2
HD3
100
Frequency (MHz)
1000 2000
D038
IF Sampling Receiver Application
RF
LO
LMH6401
1-dB Attenuator Steps
Zin ~ 100 Ÿ
0 dB to 32 dB
INP
Av =
INM
26 dB
10 Ÿ OUTP
OUTM
10 Ÿ
PD
CS
SCLK
SPI
SDI
SDO
VOCM
Ultra-
Wideband
ADC
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.