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MAX3275 Datasheet(PDF) 6 Page - Maxim Integrated Products

Part # MAX3275
Description  Low-Noise, Fibre Channel Transimpedance Amplifiers
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX3275 Datasheet(HTML) 6 Page - Maxim Integrated Products

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Output Buffer
The output buffer provides a reverse-terminated voltage
output. The buffer is designed to drive a 100
Ω differen-
tial load between OUT+ and OUT-. The output current
is divided between internal 50
Ω resistors and the exter-
nal load resistor.
For optimum supply-noise rejection, the MAX3275/
MAX3277 should be terminated with a differential load.
If a single-ended output is required, the unused
output should be terminated in a similar manner. The
MAX3275/MAX3277 will not drive a DC-coupled, 50
grounded load; however, it will drive a compatible 50
CML input.
DC Cancellation Circuit
The direct-current (DC) cancellation circuit uses low-
frequency feedback to remove the DC component of
the input signal (Figure 3). This feature centers the
input signal within the transimpedance amplifier’s linear
range, thereby reducing pulse-width distortion caused
by large input signals. Pulse-width distortion in small
signals will not be corrected.
The DC cancellation circuit is internally compensated
and therefore does not require external capacitors. This
circuit minimizes pulse-width distortion for data
sequences that exhibit a 50% mark density and 8b/10b
coding. A mark density significantly different from 50%
will cause the MAX3275/MAX3277 to generate pulse-
width distortion.
DC cancellation current is drawn from the input and
creates noise. For low-level signals with little or no DC
component, the added noise is insignificant.
Applications Information
Optical Power Relations
Many of the MAX3275/MAX3277 specifications relate to
the input signal amplitude. When working with optical
receivers, the input is sometimes expressed in terms of
average optical power and extinction ratio. Figure 4 and
Table 1 show relations that are helpful for converting
optical power to input signal when designing with
the MAX3275/MAX3277. (Refer to Application note
HFAN–3.0.0 Accurately Estimating Optical Receiver
Sensitivity.)
Optical Sensitivity Calculation
The input-referred RMS noise current (IN) of the
MAX3275/MAX3277 generally determines the receiver
Low-Noise, Fibre Channel Transimpedance
Amplifiers
6
_______________________________________________________________________________________
AMPLITUDE
OUTPUT (LARGE SIGNALS)
TIME
OUTPUT (SMALL SIGNALS)
Figure 2. MAX3275/MAX3277 Limited Output
AMPLITUDE
INPUT FROM PHOTODIODE
TIME
INPUT (AFTER DC CANCELLATION)
Figure 3. DC Cancellation Effect on Input
Table 1. Optical Power Relations
PARAMETER
SYMBOL
RELATION
Average Power
PAVG
PAVG = (P0 + P1)/2
Extinction Ratio
re
re = P1/P0
Optical Power of a 1
P1
P1 = 2PAVG(re)/(re + 1)
Optical Power of a 0
P0
P0 = 2PAVG/(re + 1)
Signal Amplitude
PIN
PIN = P1 - P0
PIN = 2PAVG(re - 1)/(re + 1)
P0
P1
PAVG
TIME
Figure 4. Optical Power Relations


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