LMH2190TM-38/NOPB

The LMH2190TM-38/NOPB from Texas Instruments is a quad-channel clock tree driver designed for applications requiring precise clock distribution, such as in mobile handsets. It can be clocked up to 27 MHz and offers independent clock request pins for each output, allowing peripherals to control clock activation.

This device supports both sine and square wave inputs, providing 1.8V square wave outputs. Key electrical specifications include an additive RMS jitter of 100 fs (typical), an output skew of 8.5 ps, and an output drive capability of up to 50 pF. The core supply voltage can range from 2.5V to 5V, with an integrated 1.8V low-dropout regulator capable of supplying 10 mA.

The LMH2190 features an I2C interface configurable up to 400 kHz (Fast Mode) for overriding default settings, including clock and clock request input polarity. It offers high isolation of supply noise to the clock input and high output-to-output isolation, along with EMI-controlled output edges and filtering. The operating temperature range is -20°C to 85°C.

Packaged in a compact DSBGA (YFQ) with an area of 3.24 mm², this clock driver is suitable for space-constrained designs. It provides a solution for clocking issues like limited drive capability, master clock protection, and isolation buffering from noisy modules.