4.25 Gbps, 3.3 V Low Noise,
Data Sheet
FEATURES
Bandwidth: 3.5 GHz
Input noise current density: 8 pA/√Hz
Optical sensitivity
−22.0 dBm
1
−20.4 dBm
2
Differential transimpedance: 3700 V/A
Power dissipation: 80 mW
Differential output swing: 260 mV p-p
Input overload current: 5.6 mA p-p
On-chip RSSI function
Low frequency cutoff: 12 kHz
On-chip PD filter: R
F
= 200 Ω, C
F
= 20 pF
Die size: 0.7 mm × 1.2 mm
APPLICATIONS
4.25 Gbps optical receivers
GbE/FC optical receivers
SFF-8472-compliant receivers
PIN/APD-TIA receiver optical subassemblies
GENERAL DESCRIPTION
The ADN2882 is a 3.3 V high gain SiGe transimpedance
amplifier (TIA) which converts the small signal current of a
photo detector to a large differential voltage output. The
ADN2882 features a typical 475 nA input-referred noise,
enabling an optical sensitivity of −22 dBm (0.85 A/W PIN).
With a bandwidth of 3.5 GHz, the ADN2882 allows a data rate
operation up to 4.25 Gbps. Typical power dissipation is 80 mW.
To facilitate the assembly in small form factor packages, such as
TO-46 headers, the ADN2882 provides an on-chip RC filter
(200 Ω, 20 pF) and features a 12 kHz low frequency cutoff
without using an external capacitor. An on-chip RSSI circuit,
which generates a voltage proportional to the average photo-
diode current, is available for power monitoring and assembly
alignment.
The ADN2882 is available in die form. With a chip area of
1.2 mm × 0.7 mm, the TIA layout is optimized for TO-Can-
based packages.
1
Based on 1550 nm PIN, C
D
= 0.5 ± 0.10 pF, responsivity = 0.85 A/W,
ER = 9 dB, PRBS 2
31
− 1 at 4.25 Gbps, BER < 10
−12
.
2
Calculated result based on an 850 nm PIN, C
D
= 0.5 ± 0.15 pF,
responsivity = 0.48 A/W, ER = 9 dB, at 4.25 Gbps, BER < 10
−12
.
FUNCTIONAL BLOCK DIAGRAM
1100Ω
0.85V
20pF
50Ω
200Ω 50Ω
3.3V
FILTER
IN
VCCFILTER
VCC
GND GND CAP
5mA
OUTB
OUT
RSSI
04946-001
Figure 1.
Rev. A
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