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PDF ATA12001 Data sheet ( Hoja de datos )
| Número de pieza | ATA12001 | |
| Descripción | AGC Transimpedance Amplifier | |
| Fabricantes | ANADIGICS | |
| Logotipo |  |
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FEATURES
· Single +5 Volt Supply
· Automatic Gain Control
· -31 dBm Sensitivity
· 0 dBm Optical Overload
· 1100 MHz Bandwidth
APPLICATIONS
· SONET OC-24 (1 Gb/s) Receiver
· Low Noise RF Amplifier
· BISDN
· HIPPI
ATA12001
AGC Transimpedance Amplifier
SONET OC-24
PRELIMINARY DATA SHEET-Rev 4
VDD2
VDD1
925 um 4E
IIN
GND
GND
1992
GND
VOUT
GND GND GND CBY CBY GND CAGC GND
1250 um
D1C
PRODUCT DESCRIPTION
The ANADIGICS ATA12001 is a 5V low noise
transimpedance amplifier with AGC designed to be
used in 1Gb/s fiber optic links. The device is used in
conjunction with a photodetector (PIN diode or
avalanche photodiode) to convert an optical signal
into an output voltage. The ATA12001 offers a
bandwidth of 1100MHz and a dynamic range of 31dB.
It is manufactured in a GaAs MESFET process and
is available in bare die form.
VDD1
AGC
VDD2
GND
IIN
or
neg. Supply
4K
- 35
VGA
70K
CAGC
4pF
+ 0.8
VOUT
PATENT PENDING
CPhotodetecBtYor Cathode must be connected to
IIN for proper AGC operation
Figure 1: Equivalent Circuit
GND
08/2001
1 page  
www.datasheet4u.coBmANDWIDTH vs. CT
1800
1600
1400
1200
B(3dB) ≈A / 2 π RF (CN + CT)
VDD = 5.5 V
VDD = 5.0 V
1000
800
VDD = 4.5 V
600
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
CT(pF)
Figure 5: Bandwidth vs. CT
Note: All performance curves are typical @ TA =25°C
unless otherwise noted.
VDD=5.5 V
VDD=4.5 V
RF
I IIN
ATA12001
1.7
1.6
1.5
1.4
1.3
1.2
5 1.1
1.0
- 2.2
- 1.7 - 1.2 - 0.7 - 0.2
IIN (mA DC)
Figure 7: Bandwidth vs. IIN
IIN Connection
(refer to the equivalent circuit diagram) Bonding the
detector cathode to IIN (and thus drawing current from
the ATA12001) improves the dynamic range. Although
the detector may be used in the reverse direction for
input currents not exceeding 25 mA, the specifications
for optical overload will not be met.
2.0
1.8
1.6
12001
IIN
I
1.4
50 1.2
1.0
VDD = 5.5 V
0.8
0.6
VDD = 4.5 V 0.4
-2.2 -1.7 -1.2 -0.7 -0.2
IIN (mA DC)
Figure 6: Transimpedance vs. IIN
VOUT Connection
The output pad should be connected via a coupling
capacitor to the next stage of the receiver channel
(filter or decision circuits), as the output buffers are
not designed to drive a DC coupled 50 ohm load
(this would require an output bias current of
approximately 36 mA to maintain a quiescent 1.8
Volts across the output load). If VOUT is connected to a
high input impedance decision circuit (>500 ohms),
then a coupling capacitor may not be required,
although caution should be exercised since DC
offsets of the photo detector/TIA combination may
cause clipping of subsequent gain or decision
circuits.
Output Collapse
heavy AGC
VDD =5.5 V
Linear Region
Rf
IIN 12001 VOUT
VDD=4.5 V
-4 -3
-2 -1
3.4
3.2
3.0
2.9
2.7
2.5
2.4
2.2
2.0
1.9
1.7
1.5
1.4
1.2
1.0
0.8
0.7
0.5
0.3
0.2
0.0
IIN(mA DC)
Figure 8: VOUT vs. IIN
PRELIMINARY DATA SHEET - Rev 4
08/2001
5
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ATA12001.PDF ] | |
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