TZA3023 Ver la hoja de datos (PDF) - Philips Electronics
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TZA3023 Datasheet PDF : 24 Pages
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Philips Semiconductors
SDH/SONET STM4/OC12
transimpedance amplifier
Product specification
TZA3023
FUNCTIONAL DESCRIPTION
The TZA3023 is a transimpedance amplifier intended for
use in fibre optic links for signal recovery in STM4/OC12
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 TZA3023 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
1 µA to 1.5 mA (p-p). An AGC loop 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.
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 13 on the bare die
(TZA3023U). Pad 13 is not bonded in the packaged device
(TZA3023T). This pad can be left unconnected during
normal operation. It can also be used to force an external
AGC voltage. If pad 13 is connected to GND, the internal
AGC loop is disabled and the receiver gain is at a
maximum. The maximum input current is then
approximately 50 µA.
A differential amplifier converts the single-ended output of
the preamplifier to a differential output voltage (see Fig.3).
handbook, full pagewidth
VCC
600 Ω 600 Ω
2 mA
4.5 mA
30 Ω
30 Ω
VOUTQ
VOUT
4.5 mA
MGK922
Fig.3 Data output buffer.
handbook, full pagewidth
2000 Mar 29
VO(max)
VOQH
VOH
VOQL
VOL
VO(min)
CML/PECL OUTPUT
VCC
VOO
Vo (p-p)
MGK885
Fig.4 Logic level symbol definitions for data outputs OUT and OUTQ.
4
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