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.
● 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 (VO = 2 VPPD, RL = 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, RS = 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
