02040-BRF-001-A Datasheet, PDF (1/2 Pages) M/A-COM Technology Solutions, Inc. – Limiting Amplifier for Applications up to 2.1 Gbps

Limiting Amplifier for Applications up to 2.1 Gbps
M02040
M02040 can support either a 3.3V or 3.3V/5V supply
The M02040 is an integrated high-gain limiting amplifier.
Featuring PECL outputs, the M02040 is usable in applica-
tions up to 2.1 Gbps. Full output swing is achieved even at
minimum input sensitivity. The M02040 operates with a 3.3V
or 3.3V/5V supply.
> KEY FEATURES
> 4 mV maximum input sensi-
tivity at 2.1 Gbps
> PECL outputs
> Average and peak-to-peak
receive power monitor
outputs
> Jam function
> Low power (< 180 mW)
> 16 pin 3x3 QFN,
standard/green package
The M02040 also includes two analog RSSI outputs propor-
tional to either the average or peak-to-peak input signal
and a programmable signal-level detector allowing the user
to set thresholds at which the logic outputs are enabled.
The M02040 is pin compatible with the M02050 2.5 Gbs post
amplifier.
Inputs
The data inputs are internally connected to V_TT via 50W
resistors, and generally need to be AC coupled. The nominal
V_TT voltage is 2.85V because of the internal resistor divider
to V_CC which means this is the DC potential on the data
inputs. See the applications information section for further
details on choosing the AC-coupling capacitor.
DC Offset Compensation
M02040 contains an internal DC autozero circuit that can
remove the effect of DC offsets without using external
components. This circuit is configured such that the feed-
back is effective only at frequencies well below the lowest
frequency of interest. The low frequency cut off is typically
25 kHz.
PECL Outputs
The M02040 features 100k/300k PECL compliant outputs.
The outputs may be terminated using any standard AC or
DC-coupling PECL termination technique. AC-coupling is
used in applications where the average DC content of the
data is zero e.g. SONET. The advantage of this approach is
lower power consumption, no susceptibility to DC drive and
compatibility with non-PECL interfaces.
Loss of Signal (LOS)
The M02040 features input signal level detection over an
extended range. Using an external resistor, R_ST, between pin
ST_SET and V_CC, the user can program the input signal
threshold. The LOS signal is active when the signal is below
the threshold value. The signal detection circuitry has the
equivalent of 3.5 dB (typical) electrical hysteresis. R_ST
establishes a threshold voltage at the ST_SET pin. Internally,
the input signal level is monitored by the level detector
(which also outputs the RSSI_PP voltage). As described in the
RSSI_PP section, this voltage is proportional to the input
signal peak-to-peak value. The voltage at ST_SET is internally
>