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TZA3013

SDH/SONET STM16/OC48 transimpedance amplifier

Philips Electronics 

Philips Semiconductors

SDH/SONET STM16/OC48

transimpedance amplifier

Product specification

TZA3013A; TZA3013B

FUNCTIONAL DESCRIPTION

The TZA3013 is a transimpedance amplifier intended for

use in fibre optic links for signal recovery in STM16/OC48

applications. It amplifies the current generated by a photo

detector (PIN diode or avalanche photodiode) and

converts it to a differential output voltage.

The most important characteristics of the TZA3013 are

high receiver sensitivity and wide dynamic range. High

receiver sensitivity is achieved by minimizing

transimpedance amplifier noise.

The TZA3013 has a wide dynamic range to handle the

signal current generated by the PIN diode which can vary

from 6 µA to 1.7 mA (p-p). This is implemented by an AGC

loop which reduces the preamplifier feedback resistance

so that the amplifier remains linear over the whole input

range. The AGC loop hold capacitor is integrated on-chip,

so an external capacitor is not required.

A differential amplifier converts the output of the

preamplifier to a differential voltage. The data output circuit

is shown in Fig.3.

The logic level symbol definitions are shown in Fig.4.

handbook, full pagewidth

VCC

2 kΩ

OUTSENSE

50 Ω

OUT

50 Ω

OUTQ

2 kΩ

OUTQSENSE

16 Ω

16 Ω

MGT102

Fig.3 Data output circuit.

handbook, full pagewidth

VO(max)

VOQH

VOH

VOQL

VOL

VO(min)

VOO

VCC

Vo(p-p)

MGR243

2001 Feb 26

Fig.4 Logic level symbol definitions for data outputs OUT and OUTQ.

5

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