TZA3036U PHILIPS [NXP Semiconductors], TZA3036U Datasheet - Page 4

• Manufacturer Part Number: TZA3036U
• Description: SDH/SONET STM1/OC3 transimpedance amplifier
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Table 2.
Bonding pad locations with respect to the center of the die (see
[1]
7. Functional description
TZA3036_1
Product data sheet
Symbol
GND
GND
OUTQ
OUT
AGC
IDREF_MON
V
CC
These pads go HIGH when current flows into pad IPHOTO.
Bonding pad description
Pad
11
12
13
14
15
16
17
7.1 PIN diode connections
The TZA3036 is a TransImpedance Amplifier (TIA) intended for use in fiber optic links for
signal recovery in STM1/OC3 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 TZA3036 are high receiver sensitivity, wide
dynamic range and large bandwidth. Excellent receiver sensitivity is achieved by
minimizing transimpedance amplifier noise.
The TZA3036 has a wide dynamic range to handle the signal current generated by the
PIN diode which can vary from 0.18 A 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 TZA3036 is optimized for STM1/OC3 application. It works from DC
onward due to the absence of offset control loops. This allows for excellent performance
regardless of signal content (long sequences of identical bits can be converted). A
differential amplifier converts the output of the preamplifier to a differential voltage.
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.
X
486.4
346.4
206.4
66.4
73.6
213.6
353.6
…continued
Y
278.6
278.6
278.6
278.6
278.6
278.6
278.6
Rev. 01 — 24 March 2006
Type
ground
ground
output
output
input
output
supply
Figure
SDH/SONET STM1/OC3 transimpedance amplifier
Description
ground; connect together pads 9, 10, 11 and 12 as
many as possible
ground; connect together pads 9, 10, 11 and 12 as
many as possible
data output; complement of pad OUT; use pad 7 or pad
13
data output; use pad 8 or pad 14
AGC voltage; use pad 6 or pad 15
current output for RSSI measurements; connect a
resistor to pad 5 or pad 16 and ground
supply voltage; connect supply to pad 4 or pad 17
10); X and Y are in m.
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
[1]
TZA3036
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