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.