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.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
LMH6401 | UQFN (16) | 3.00 mm × 3.00 mm |
Changes from * Revision (April 2015) to A Revision
DEVICE | BW (AV = 12 dB) | DISTORTION | NOISE |
---|---|---|---|
LMH5401 | 6.2 GHz | –75-dBc HD2, –75-dBc HD3 at 500 MHz | 1.25 nV/√Hz |
LMH3401 | 7 GHz, G = 16 dB | –79-dBc HD2, –77-dBc HD3 at 500 MHz | 1.4 nV/√Hz |
LMH6554 | 1.6 GHz | –79-dBc HD2, –70-dBc HD3 at 250 MHz | 0.9 nV/√Hz |
DEVICE | MAX GAIN, BW | DISTORTION | NOISE FIGURE |
---|---|---|---|
LMH6517 | 22 dB, 1.2 GHz | 43-dBm OIP3 at 200 MHz, –74-dBc HD3 at 200 MHz | 5.5 dB |
LMH6521 | 26 dB, 1.2 GHz | 49-dBm OIP3 at 200 MHz, –84-dBc HD3 at 200 MHz | 7.3 dB |
LMH6881 | 26 dB, 2.4 GHz | 42-dBm OIP3 at 200 MHz, –76-dBc HD3 at 200 MHz | 9.7 dB |