1FEATURES

23• Fast Switching: Rise and Fall Times: 0.6/1.0

ns.

• Low Voltage Differential Signaling (LVDS)

Channels Enable Interface for the Fast Switching Lines

• Low Output Current Noise: 0.24 nA/√Hz

• Dual Output: Selectable by SELA/B Pin (Active

HIGH)

– SELA = LMH6526 SEB = LMH6525

• Four Independent Current Channels

– Gain of 300, 300 mA Write Channel

– Gain of 150, 150 mA Low-Noise Read

Channel

– Two Gain of 150, 150 mA Write Channels

– 600 mA Minimum Combined Output Current

• Integrated AC Coupled HFM Oscillator

– Selectable Frequency and Amplitude

Setting

– By External Resistors

– 200 MHz to 600 MHz Frequency Range

– Amplitude to 100 mA Peak-to-Peak

Modulation

• Complete Shutdown by ENABLE Pin

• 5V Single-Supply Operation

• Logic inputs TTL and CMOS compatible

• Space Saving Package (OFN)

• LMH6525 has Differential Enable Oscillator

Inputs

• LMH6526 has Single Ended Enable Oscillator

Inputs

APPLICATIONS

• Combination DVD/CD Recordable and

Rewritable Drives

• DVD Camcorders

• DVD Recorders

DESCRIPTION

The LMH™6525/6526 is a laser diode driver for use

in combination DVD/CD recordable and rewritable

systems. The part contains two high-current outputs

for reading and writing the DVD (650 nm) and CD

(780 nm) lasers. Functionality includes read, write

and erase through four separate switched current

channels. The channel currents are summed together

at the selected output to generate multilevel

waveforms for reading, writing and erasing of optical

discs. The LVDS interface delivers DVD write speeds of 16x and higher while minimizing noise and

crosstalk. The LMH6525/6526 is optimized for both

speed and power consumption to meet the demands

of next generation systems. The part features a 150

mA read channel plus one 300 mA and two 150 mA write channels, which can be summed to allow a total

output current of 600 mA or greater. The channel

currents are set through four independent current

inputs.