T0810

Features:

Current-controlled output current source with 3 input channels
Low-power consumption
Output current per channel to 150 mA
Total output current to 200 mA
Rise time 1.0 ns / fall time 1.1 ns
On-chip RF oscillator
Control of frequency and swing by use of 2 external resistors
Oscillator frequency range from100MHz to 500 MHz
Oscillator swing to 100 mA
Fast settling APC amplifier
Single 5-V power supply
Common enable / disable input
TTL/CMOS control signals
Small SSO16 package


Application

CD-RW drives
Writable optical drives


Pinout




Specifications

Parameter	Symbol	Value	Unit
Supply voltage	VCC	-0.5 to +6.0	V
Input voltage at IR, I2, I3	VIN1	-0.5 to + 0.5	V
Input voltage at NE2, NE3, ENOSC	VIN2	-0.5 to VCC + 0.5	V
Output voltage	VOUT	-0.5 to VCC 1	V
Power dissipation	PMAX	1 1)	W
Junction temperature	TJ	150
Storage temperature range	TSTG	-65 to +125

1) R_thJA  80 K/W


Description

The T0810 is a laser diode driver for the operation of a grounded laser diode for CD-RWdrives. T0810 includes three channels for three different optical power levels which are controlled by a separate IC. The read channel generates a continuous output level whereas the channels 2 and 3 are provided as write channels with very fast switching speeds. Write current pulses are enabled when a 'low' signal is applied to the NE Pins. All channels of T0810 are summed together at the IOUT Pin. Each channel can contribute up to 150 mA to the total output current of up to 200 mA. A total gain of 400 mA is provided between each reference current input and output. Although the reference inputs are current inputs, voltage control is possible by using external resistors.

An on-chipRF oscillator of T0810 is provided to reduce lasermode hopping noise during read mode. Frequency and swing can be set by two external resistors.Oscillation is enabled by a 'high' at the ENOSC Pin. Complete output current and oscillator switch-off of T0810 is achieved by a 'low' at the ENABLE input.

The T0810 also includes a fast settling APC (Adaptive Power Control) transimpedance amplifier. It is provided to interface between the front end monitor photo diode and the ALPC (Adaptive Laser Diode Power Controller) circuit.