TZA1024 datasheet(8/20 Pages) PHILIPS

8 / 20 page

1998 Oct 30

Philips Semiconductors

Product speciﬁcation

Data ampliﬁer and laser supply circuit for CD

audio and video optical systems (ADALAS)

TZA1024

CHARACTERISTICS

VDD = 2.4 V; VDD(L) − Vo(LASER) = 0.55 V; Ii(DIN) = 0 mA; Io(LASER) = 80 mA; VCMFB = 1⁄2VDD; PWRON = HIGH;

CDRW = LOW; EQSEL = open-circuit; CCFIL = 10 nF; RRFFB =10kΩ; pin RGADJ connected to ground; Tamb =25 °C;

unless otherwise speciﬁed.

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Supplies

VDD

supply voltage

2.4

−

5.5

VDDL(L)

laser supply voltage

2.4

−

5.5

IDD

supply current

−

quiescent supply

current

PWRON = LOW

−−

µA

RF ampliﬁer

Ii(DIN)

central diode input

current

−70

−

+70

µA

Zi(DIN)

central diode input

impedance

−

100

−Ω

VCMFB

common mode

feedback input voltage

0.7

⁄2VDD

VDD − 0.4

VO(RFEQO)

RF ampliﬁer output

DC-level

CDRW = LOW

VCMFB − 0.05 −

VCMFB + 0.25 V

CDRW = HIGH

VCMFB − 0.35 −

VCMFB + 0.35 V

Vo(RFEQO)

RF ampliﬁer output

voltage

0.25

−

VDD − 0.25

Zo(RFEQO)

RF ampliﬁer output

impedance

note 1

−

100

−Ω

td(f)(RF)

RF ﬂatness delay

CDRW = LOW or HIGH

f < 1 MHz; n = 1;

EQSEL = LOW

−−

f < 2 MHz; n = 2;

EQSEL = HIGH

−−

5ns

f < 4 MHz; n = 4;

EQSEL = open-circuit

−−

2.5

GRF

RF path gain boost

CDRW = LOW or HIGH;

notes 2 and 3

f = 720 kHz; n = 1;

EQSEL = LOW

−

f = 1440 kHz; n = 2;

EQSEL = HIGH

−

f = 2880 kHz; n = 4;

EQSEL = open-circuit

−

Ztr(RF)

RF transimpedance

note 4

CDRW = LOW

9.2

9.8

10.4

Ω

CDRW = HIGH

35.6

40.4

Ω

THDRF

RF total harmonic

distortion

note 3

−−50

−

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