TZA3026 Просмотр технического описания (PDF) - NXP Semiconductors.

Номер в каталоге

Компоненты Описание

производитель

TZA3026

SDH/SONET STM4/OC12 transimpedance amplifier

NXP Semiconductors. 

Philips Semiconductors

TZA3026

SDH/SONET STM4/OC12 transimpedance amplifier

Table 2: Bonding pad description …continued

Bonding pad locations with respect to the center of the die (see Figure 10), X and Y are in µm.

Symbol

Pad X

Y

Type

Description

GND

11 486.4 278.6 ground

ground; connect together pads 9, 10, 11 and pad 12 as many as

possible

GND

12 346.4 278.6 ground

ground; connect together pads 9, 10, 11 and pad 12 as many as

possible

OUTQ

13 206.4 278.6 output

data output; complement of pad OUT; use pad 7 or pad 13

OUT

14 66.4 278.6 output

data output; use pad 8 or pad 14 [1]

AGC

15 −73.6 278.6 input

AGC voltage; use pad 6 or pad 15

IDREF_MON 16 −213.6 278.6 output

current output for RSSI measurements; connect a resistor to pad 5

or pad 16 and ground

VCC

17 −353.6 278.6 supply

supply voltage; connect supply voltage to pad 4 or pad 17

[1] These pads go HIGH when current flows into pad IPHOTO.

7. Functional description

The TZA3026 is a TransImpedance Amplifier (TIA) intended for use in fiber optic receivers

for signal recovery in STM4/OC12 or FTTx 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 TZA3026 are high receiver sensitivity, wide

dynamic range and large bandwidth. Excellent receiver sensitivity is achieved by

minimizing transimpedance amplifier noise.

The TZA3026 has a wide dynamic range to handle the signal current generated by the

PIN diode which can vary from 0.85 µA to 1.5 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.

The bandwidth of TZA3026 is optimized for STM4/OC12 application. It works from DC

onward due to the absence of offset control loops. Therefore the amount of Consecutive

Identical Digits (CID) will not effect the output waveform. A differential amplifier converts

the output of the preamplifier to a differential voltage.

7.1 PIN diode connections

The performance of an optical receiver is largely determined by the combined effect of the

transimpedance amplifier and the PIN diode. In particular, the method used to connect the

PIN diode to the input (pad IPHOTO) and the layout around the input pad strongly

influences the main parameters of a transimpedance amplifier, such as sensitivity,

bandwidth, and PSRR.

Sensitivity is most affected by the value of the total capacitance at the input pad.

Therefore, to obtain the highest possible sensitivity the total capacitance should be as low

as possible.

9397 750 14763

Product data sheet

Rev. 01 — 2 May 2005

© Koninklijke Philips Electronics N.V. 2005. All rights reserved.

4 of 15

Share Link: