The LMH6678 is a low power 2-channel central-office xDSL driver that uses dual current feedback op amps to achieve a fixed gain of AV = +5.4, with high integration and low power consumption. It can provide 580 mW at 19.8 dBm line output power. The LMH6678 can also be put into a listen mode to maintain the termination for receive signals with 100 mW/Ch power dissipation. The LMH6678 has two separate 2-bit power control inputs compatible with 3.3V CMOS for each channel, which enable independent control of line status. When the drivers for both channels are shut off, power consumption drops to only 6 mW. Thermal Shutdown function protects the IC from a shorted line fault or system over temperature. The LMH6678 is available in a 5mm x 4mm 24-lead LLP package.
The LMH6678 is a low power 2-channel differential output driver utilizing dual current feedback op amps with a fixed gain of AV= +5.4. It provides high integration with low power consumption, delivering 580 mW at 19.8 dBm line output. The device includes two separate 2-bit power control inputs compatible with 3.3V CMOS for independent channel status control and features thermal shutdown protection.
| Fixed Voltage Gain (AV) | +5.4 V/V |
|---|---|
| Line Output Power | 19.8 dBm (580 mW) |
| Listen Mode Power Dissipation | 100 mW/Ch |
| Shutdown Mode Power Consumption | 6mW total (3 mW/Ch) |
| Analog Supply Voltage | +12V |
| Output Current | 580 mA |
| Package Type | 24-lead LLP (5mm x 4mm) |
| Thermal Resistance (θJA) | 36˚C/W |
The device utilizes dual current feedback op amps with a fixed gain of AV= +5.4.
The analog supplies (AVCC1, AVCC2) require +12V and the digital supplies (DVDD, AVDD) require +3.3V.
Yes, it has a Thermal Shutdown function to protect the IC from shorted line faults or system over temperature.