ONET8531T_17 Datasheet, PDF (5/17 Pages) Texas Instruments – 11.3 Gbps Limiting Transimpedance Amplifier With RSSI

ONET8531T
www.ti.com
SLLS891B – FEBRUARY 2008 – REVISED AUGUST 2011
AC ELECTRICAL CHARACTERISTICS
Z₂₁
f_HSS,3dB
f_L,3dB
I_N,IN
S_US
DJ
PARAMETER
Small signal transimpedance
Small signal bandwidth
Low frequency –3 dB bandwidth
Input referred RMS noise
Unstressed sensitivity optical
Deterministic jitter
DJ_OL
V_OUT,D,MAX
A_{RSSI_IB}
A_{RSSI_EB}
PSNR
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
TEST CONDITIONS
Differential output; Input current I_IN = 20 μA_p-p
I_IN = 16 μA_p-p ⁽¹⁾
16 μA < I_IN < 2000 μA_p-p
10 GHz bandwidth⁽²⁾
10.3125 Gbps, PRBS31 pattern, 850 nm, BER 10^–12
16 μA_p-p < I_IN < 500 μA_p-p (10.3125 Gbps,
PRBS31 pattern)
500 μA_p-p < I_IN < 2000 μA_p-p (10.3125 Gbps,
PRBS31 pattern)
2000 μA_p-p < I_IN < 2500 μA_p-p (K28.5 pattern)
Input current I_IN = 200 μA_p-p
Resistive load to GND⁽³⁾
Resistive load to GND⁽³⁾
F < 10 MHz⁽⁵⁾, supply filtering according to SFF8431
MIN TYP MAX
2500 4500 6500
7 10
30 100
0.9 1.6
–14
UNIT
Ω
GHz
kHz
μA
dBm
6 11
ps_p-p
6 13
240
0.48
6 15 ps_p-p
280 350 mV_p-p
0.5 0.52 A/A
3.5 10 16 μA
0.43
0.6 A/A
25
μA
–15
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 = (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–0.65 V.
(4) Offset is added to improve accuracy below 5 μA. 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 © 2008–2011, Texas Instruments Incorporated
5