TZA3036 Просмотр технического описания (PDF) - Philips Electronics
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TZA3036 Datasheet PDF : 15 Pages
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Philips Semiconductors
TZA3036
SDH/SONET STM1/OC3 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 12 as
many as possible
GND
12
346.4
278.6
ground ground; connect together pads 9, 10, 11 and 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 to pad 4 or pad 17
[1] These pads go HIGH when current flows into pad IPHOTO.
7. Functional description
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 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 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.
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.
TZA3036_1
Product data sheet
Rev. 01 — 24 March 2006
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
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