2

9105BS–DVD–03/08

ATR0881 [Preliminary]

1.

Description

The ATR0881 is a laser diode driver designed to operate two grounded red laser diodes for CD

and DVD and one floating blue laser diode for Blu-ray. The floating blue laser diode needs an

extra supply voltage V

flexible and configurable for a wide range of applications. Five channels can be assigned to one

of the two reference current inputs IR and IW. The channel gains can be individually set by

DACs. Prescalers with 2 bits are provided to increase the resolution. Overcurrent protection cir-

cuits supervise the reference current inputs. The channel enable inputs can be configured as

single ended or LVDS. In SyncDrive mode, channels 3, 4, and 5 are synchronized to channel 2.

The on-chip spread spectrum HFM with low EMI reduces laser mode hopping noise. All HFM

frequency and swing parameters can be set by the serial interface. A high frequency-accuracy

can be achieved by the frequency counter feature. HFM enable can be configured as single

ended or LVDS or automatically-disabling by write channels.