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TZA1024

Data amplifier and laser supply circuit for CD audio and video optical systems (ADALAS)

Philips Electronics 

Philips Semiconductors

Data amplifier and laser supply circuit for CD

audio and video optical systems (ADALAS)

Product specification

TZA1024

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

VIH

HIGH-level input

voltage

pin CDRW

pin PWRON

pin EQSEL

note 10

2⁄3VDD

−

2⁄3VDD

−

−

−

VDD + 0.2

V

VDD + 0.2

V

−

V

Notes

1. Closed-loop output impedance (10 kΩ between pins RFEQO and RFFB).

2. GRF = (GRFEQO at fEQ) − (GRFEQO at f = 1 kHz) where:

a) fEQ = 720 kHz for n = 1 times speed (see Fig.5)

b) fEQ = 1440 kHz for n = 2 times speed (see Fig.6)

c) fEQ = not applicable for n = 4 times speed (see Fig.7).

3. The appropriate external filter (n = 1, 2 or 4) should be used (see Table 1).

4. Values to be used in equation (1).

5. Vdrop = VDD(L) − Vo(LASER).

6. An external resistor can be used to reduce the maximum output current (and the gain) of the laser supply;

see equation (4).

7. The output impedance strongly depends on the drop voltage (Vdrop). The output impedance will approximately double

when the drop voltage doubles.

8.

RSref = -∆---∆---V----V--V----V---m---D---m---D---o--D----o--n-D-----n--

9. When a voltage dip at VDD(L) occurs it could cause peak currents on Io(LASER) coming out of the ALPC output.

To protect the laser against such peak currents a protection circuit will switch-off the laser current when Vdrop

becomes lower than Vclamp. When Vdrop > Vclamp the laser will switch-on automatically again.

10. The pin EQSEL is a three level switch. When this pin is left open-circuit two internal resistors will keep the pin EQSEL

at 1⁄2VDD. This is the n = 4 times speed state. The two internal resistors are non-linear (when EQSEL = HIGH or LOW

the input or output current will be limited).

1998 Oct 30

10

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