INTEGRATED CIRCUITS
DATA SHEET
TZA3023
SDH/SONET STM4/OC12
transimpedance amplifier
Product specification
Supersedes data of 2000 Mar 29
2002 Sep 05
Philips Semiconductors
Product specification
SDH/SONET STM4/OC12
transimpedance amplifier
FEATURES
•
Wide dynamic input range from 1
µA
to 1.5 mA
•
Low equivalent input noise of 3.5 pA/√Hz (typical)
•
Differential transimpedance of 21 kΩ
•
Wide bandwidth from DC to 600 MHz
•
Differential outputs
•
On-chip Automatic Gain Control (AGC)
•
No external components required
•
Single supply voltage from 3.0 to 5.5 V
•
Bias voltage for PIN diode
•
Pin compatible with SA5223
•
Goldplated version available for direct placement of
photodiode on die.
ORDERING INFORMATION
TYPE
NUMBER
TZA3023T
TZA3023U
TZA3023U/G
PACKAGE
NAME
SO8
−
−
DESCRIPTION
plastic small outline package; 8 leads; body width 3.9 mm
bare die in waffle pack carriers; die dimensions 1.030
×
1.300 mm
bare die with goldplating in waffle pack carriers; die dimensions
1.030
×
1.300 mm
APPLICATIONS
TZA3023
•
Digital fibre optic receiver in short, medium and long
haul optical telecommunications transmission systems
or in high-speed data networks
•
Wideband RF gain block.
DESCRIPTION
The TZA3023 is a low-noise transimpedance amplifier with
AGC designed to be used in STM4/OC12 fibre optic links.
It amplifies the current generated by a photo detector
(PIN diode or avalanche photodiode) and converts it to a
differential output voltage.
VERSION
SOT96-1
−
−
2002 Sep 05
2
Philips Semiconductors
Product specification
SDH/SONET STM4/OC12
transimpedance amplifier
BLOCK DIAGRAM
TZA3023
handbook, full pagewidth
VCC
8 (11, 12)
2
kΩ
DREF 1 (1)
GAIN
CONTROL
AGC
(1)
(13)
peak detector
IPhoto 3 (4)
7 (10) OUTQ
A1
low noise
amplifier
single-ended to
differential converter
6 (9) OUT
TZA3023
2, 4, 5 (2, 3, 5, 6, 7, 8)
BIASING
MGK918
GND
The numbers in brackets refer to the pad numbers of the bare die version.
(1) AGC analog I/O is only available on the TZA3023U (pad 13).
Fig.1 Block diagram.
2002 Sep 05
3
Philips Semiconductors
Product specification
SDH/SONET STM4/OC12
transimpedance amplifier
PINNING
SYMBOL
DREF
GND
IPhoto
GND
GND
OUT
OUTQ
V
CC
AGC
Note
1. For the TZA3023U/G this pad is connected to the gold layer on top of the passivation layer.
PIN
TZA3023T
1
2
3
4
5
6
7
8
−
PAD
TZA3023U
1
2, 3
4
5, 6
7, 8
9
10
11, 12
13
TYPE
analog output
ground
analog input
ground
ground
output
output
supply
input/output
DESCRIPTION
TZA3023
bias voltage for PIN diode; cathode should be connected to
this pin; note 1
ground
current input; anode of PIN diode should be connected to this
pin; DC bias level of 800 mV, one diode voltage above ground
ground
ground
data output; pin OUT goes HIGH when current flows into
pin IPhoto
data output; compliment of pin OUT
supply voltage
AGC analog I/O
handbook, halfpage
DREF 1
GND 2
8 VCC
7
OUTQ
OUT
GND
TZA3023T
IPhoto
GND
3
4
MGK917
6
5
Fig.2 Pin configuration.
2002 Sep 05
4
Philips Semiconductors
Product specification
SDH/SONET STM4/OC12
transimpedance amplifier
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.
TZA3023
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
30
Ω
30
Ω
VOUTQ
VOUT
4.5 mA
2 mA
4.5 mA
MGK922
Fig.3 Data output buffer.
handbook, full pagewidth
CML/PECL OUTPUT
VCC
VO(max)
VOQH
VOH
Vo (p-p)
VOQL
VOL
VO(min)
VOO
MGK885
Fig.4 Logic level symbol definitions for data outputs OUT and OUTQ.
2002 Sep 05
5
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