ONET8541T_16 Datasheet, PDF (5/17 Pages) Texas Instruments – 11.3 Gbps Limiting Transimpedance Amplifier

ONET8541T
www.ti.com
SLLSE85A – JULY 2011 – REVISED AUGUST 2011
AC ELECTRICAL CHARACTERISTICS
over recommended operating conditions (unless otherwise noted). Typical values are at V_CC = +3.3 V and T_A = 25°C
PARAMETER
TEST CONDITIONS
MIN TYP MAX
Z₂₁
f_HSS,3dB
f_L,3dB
i_N,IN
S_US
DJ
DJ_OL
V_OUT,D,MAX
A_{RSSI_IB}
A_{RSSI_EB}
PSNR
Small signal
transimpedance
Small signal bandwidth
Low frequency –3 dB
bandwidth
Input referred RMS noise
Unstressed sensitivity
Deterministic jitter
Overload deterministic jitter
Maximum differential output
voltage
RSSI gain internal bias
RSSI internal bias output
offset current (no light)⁽⁴⁾
RSSI gain external bias
RSSI external bias output
offset current (no light)
Power supply noise
rejection
Differential output; Input current i_IN = 20 μA_PP
i_IN = 16 μA_PP ⁽¹⁾
16 μA < i_IN < 2000 μA_PP
10 GHz bandwidth⁽²⁾
10.3125 Gbps, PRBS31 pattern, 1310 nm, BER 10^–12
25 μA_PP < i_IN < 500 μA_PP (10.3125 Gbps, K28.5 pattern)
500 μA_PP < i_IN < 2000 μA_PP (10.3125 Gbps, K28.5 pattern)
2000 μA_PP < i_IN < 2500 μA_PP (10.3125 Gbps, K28.5 pattern)
Input current i_IN = 500 μA_PP
Resistive load to GND⁽³⁾
Resistive load to GND⁽³⁾
F < 10 MHz⁽⁵⁾, Supply filtering according to SFF8431
2500 4000
7
9
30 100
0.95 1.4
–20
6
12
6
14
7
16
180 300 420
0.48 0.5 0.52
2
7
16
0.43
0.6
25
–15
UNIT
Ω
GHz
kHz
μA
dBm
ps_PP
ps_PP
mV_PP
A/A
μA
A/A
μA
dB
(1) The small signal bandwidth is specified over process corners, temperature, and supply voltage variation. The assumed photodiode
capacitance is 0.2 pF and the bond-wire inductance is 0.3 nH. The small signal bandwidth strongly depends on environmental parasitics.
Careful attention to layout parasitics and external components is necessary to achieve optimal performance.
(2) Input referred RMS noise is (RMS output noise)/ (gain at 100 MHz).
(3) The RSSI output is a current output, which requires a resistive load to ground (GND). The voltage gain can be adjusted for the intended
application by choosing the external resistor; however, for proper operation, ensure that the voltage at RSSI does not exceed
V_CC – 0.65V.
(4) Offset is added to improve accuracy below 5μA. When measured without input current (no light) the offset can be subtracted as a
constant offset from RSSI measurements.
(5) PSNR is the differential output amplitude divided by the voltage ripple on supply; no input current at IN.
Copyright © 2011, Texas Instruments Incorporated
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