1999 Aug 24

11

Philips Semiconductors

Preliminary specification

SDH/SONET STM1/OC3 laser drivers

TZA3031AHL; TZA3031BHL;

TZA3031U

CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Supply

supply voltage

4.75

5

5.25

V

supply current

note 1

−

65

90

mA

total power dissipation

note 2

−

430

810

mW

Data inputs: pins DIN and DINQ (and pins DLOOP and DLOOPQ on TZA3031BHL); see Fig.5

input voltage

(peak-to-peak value)

differential

100

250

800

mV

input offset voltage

−25

−

+25

mV

minimum input voltage

−−

V

maximum input voltage

−−

input impedance

for low frequencies;

single-ended

810

12

k

Ω

CMOS inputs: pin ALS (and pin ENL on TZA3031BHL)

LOW-level input voltage

−−

1.5

V

HIGH-level input voltage

3.5

−−

V

internal pull-down resistance on

pin ALS

21

25.5

30

k

Ω

internal pull-down resistance on

pin ENL

15

25

35

k

Ω

CMOS output: pin ALARM (on TZA3031AHL)

LOW-level output voltage

−

0.2

V

HIGH-level output voltage

4.8

−

5V

Monitor photodiode input: pin MONIN

DC input voltage

1.5

1.8

2.0

V

monitor photodiode current

laser optical ‘0’

24

−

260

µA

laser optical ‘1’

96

−

1040

µA

monitor photodiode capacitance note 3

30

−

50

pF

Control loop reference currents: pins ONE and ZERO

reference current on pin ONE

note 4

6

−

65

µA

reference voltage on pin ONE

−1.55

−1.5

−1.45

V

reference current on pin ZERO

note 4

6

−

65

µA

reference voltage on pin ZERO

−1.55

−1.5

−1.45

V

Control loop time constants: pins TONE and TZERO

voltage on pin TONE

floating output

1.4

−

3.4

V

transconductance of pin TONE

note 5

−

100

−

mA/V

voltage on pin TZERO

floating output

1.4

−

3.4

V

transconductance of pin TZERO note 6

−

160

−

mA/V