MGA-85563-BLKG Avago Technologies US Inc., MGA-85563-BLKG Datasheet - Page 7

• Manufacturer Part Number: MGA-85563-BLKG
• Description: AMP RFIC LNA GAAS 3V SOT-363
• Manufacturer: Avago Technologies US Inc.
• Type: General Purpose Amplifierr

Specifications of MGA-85563-BLKG

• P1db: 0.9dBm
• Noise Figure: 1.6dB
• Package / Case: SC-70-6, SC-88, SOT-363
• Current - Supply: 15mA ~ 20mA
• Frequency: 0Hz ~ 6GHz
• Gain: 18dB
• Rf Type: Cellular, PCS, WLAN
• Test Frequency: 2GHz
• Voltage - Supply: 2.7V ~ 3.6V
• Mounting Style: SMD/SMT
• Technology: Low Noise Amplifier
• Number Of Channels: 1
• Operating Frequency: 6000 MHz
• Operating Supply Voltage: 3 V
• Supply Current: 20 mA @ 3 V
• Manufacturer's Type: Low Noise Amplifier
• Frequency (max): 6GHz
• Operating Supply Voltage (typ): 3V
• Package Type: SOT-363
• Mounting: Surface Mount
• Pin Count: 6
• Noise Figure (typ): 1.6(Min)@6000MHzdB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 516-1957; MGA-85563-BLKG

MGA-85563 Applications Information
Description
The MGA-85563 is a two-stage, low noise GaAs RFIC am-
plifier designed for receiver applications in the 800 MHz
to 5.8 GHz frequency range. The device combines low
noise performance with high linearity to make it a desir-
able choice for receiver front end stages.
A special feature of the MGA-85563 is the ability to cus-
tomize its output power capability for higher linearity by
setting the device’s current. For applications requiring
additional dynamic range, the third order intercept point
can be boosted by up to 6 dB by using this feature.
The MGA-85563 operates from a +3-volt power supply
and draws a nominal current of 15 mA. The RFIC is con-
tained in a miniature SOT-363 (SC-70) package to mini-
mize printed circuit board space. The combination of
3-volt operation and small size are important to design-
ers of miniature, battery-powered wireless communica-
tions products such as cellular telephones, PCS, and RF
modems.
The high frequency response of the MGA-85563 extends
through 6 GHz making it an excellent choice for use in 5
GHz RLL as well as 2.4 and 5.7 GHz spread spectrum and
ISM/license-free band applications.
Internal, on-chip capacitors limit the low end frequency
response to applications above approximately 500 MHz.
Application Guidelines
The MGA-85563 is very easy to use. For most applications,
all that is required to operate the MGA-85563 is to apply +3
volts to the RF Output pin, and noise match the RF Input.
RF Input
To achieve lowest noise figure performance, the input
of the MGA-85563 should be matched from the system
impedance (typically 50 Ω) to the optimum source im-
pedance for minimum noise, *
the input of the device impedance is near 50 Ω and the
reactive part is capacitive, a simple series inductor at
the input is often all that is needed to provide a suitable
noise match for many applications.
RF Output
The RF Output port is internally matched to 50 Ω and will
not normally require additional matching.
DC Bias
DC bias is applied to the MGA-85563 through the RF
Output connection. Figure 15 shows how an inductor
(RFC) is used to isolate the RF signal from the DC supply.
7
opt
. Since the real part of
Input
The bias line is capacitively bypassed to keep RF from the
DC supply lines and prevent resonant dips or peaks in
the response of the amplifier.
The DC schematic for an MGA-85563 amplifier circuit is
shown in Figure 15.
Figure 15. Schematic Diagram with Bias and Current Setting Connections.
A DC blocking capacitor (C2) is used at the output of the
RFIC to isolate the supply voltage from succeeding circuits.
While the RF input terminal of the MGA-85563 is at DC
ground potential, it should not be used as a current sink.
If the input is connected directly to a preceding stage
that has a DC voltage present, a blocking capacitor (C1)
should be used.
Setting the Bias Current for Higher Linearity
The MGA-85563 has a feature that allows the user to
place an external resistor (R
ground and thereby increase the device current. The
current can be raised from its nominal 15 mA up to ap-
proximately 50 mA. The higher current increases ampli-
fier linearity by boosting output power (P
8 dB. Maximum linearity performance is obtained at a
current of 30 to 35 mA. Currents greater than 35 mA are
not recommended since the output power has reached
a point of diminishing returns at this current.
Figure 16 shows the relationship between device current
and the value of the external resistor.
Figure 16. Bias Current vs. Resistor Value.
RF
35
30
25
20
15
10
C1
10
R
b
85
50
C3
90
R
b
RFC
()
130
C2
+3V
Output
170
RF
b
) from the R
200
bias
1dB
) by up to
pin to DC