TZA3033T/C3,112 NXP Semiconductors, TZA3033T/C3,112 Datasheet - Page 5

• Manufacturer Part Number: TZA3033T/C3,112
• Manufacturer: NXP Semiconductors

Specifications of TZA3033T/C3,112

• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• Lead Free Status / RoHS Status: Compliant

Philips Semiconductors
FUNCTIONAL DESCRIPTION
The TZA3033 is a transimpedance amplifier intended for
use in fibre optic links for signal recovery in STM1/OC3
applications. It amplifies the current generated by a photo
detector (PIN diode or avalanche photodiode) and
transforms it into a differential output voltage. The most
important characteristics of the TZA3033 are high receiver
sensitivity and wide dynamic range.
High receiver sensitivity is achieved by minimizing noise in
the transimpedance amplifier. The signal current
generated by a PIN diode can vary between
0.25 A to 1.6 mA (p-p). An AGC loop (see Fig.1) is
implemented to make it possible to handle such a wide
dynamic range. The AGC loop increases the dynamic
range of the receiver by reducing the feedback resistance
of the preamplifier.
2002 Sep 06
handbook, full pagewidth
handbook, full pagewidth
SDH/SONET STM1/OC3
transimpedance amplifier
Fig.4 Logic level symbol definitions for data outputs OUT and OUTQ.
V CC
V O(max)
V O(min)
V OQH
V OQL
V OH
V OL
266
Fig.3 Data output circuit.
2 mA
266
5
V OO
The AGC loop hold capacitor is integrated on-chip, so an
external capacitor is not needed for AGC. The AGC
voltage can be monitored at pad 15 on the bare die
(TZA3033U). Pad 15 is not bonded in the packaged device
(TZA3033T). This pad can be left unconnected during
normal operation. It can also be used to force an external
AGC voltage. If pad 15 (AGC) is connected to V
internal AGC loop is disabled and the receiver gain is at a
maximum. The maximum input current is then
approximately 10 A.
A differential amplifier converts the output of the
preamplifier to a differential voltage (see Fig.3).
The logic level symbol definitions are shown in Fig.4.
4.5 mA
4.5 mA
30
30
MGT547
MGR243
V CC
V o(p-p)
OUTQ
OUT
Product specification
TZA3033
CC
, the