RF2492PCBA 데이터 시트보기 (PDF) - RF Micro Devices
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RF2492PCBA Datasheet PDF : 22 Pages
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RF2492
Preliminary
Pin Function Description
Interface Schematic
1
LO IN
LO input for both bands. Impedance is approximately (120-j25)Ω.
1kΩ shunt resistor (static bleed).
AC coupled to transistor base
(internal DC block).
2
VCC2
Power supply connection for internal LO amplifiers. External low-induc-
tance bypass capacitor between 1nF and 47nF recommended.
3
GND
Ground connection.
4
IF1+
High-band IF output. Open collector. “Current combiner” IF interface to 2pF internal shunt capacitance.
1000Ω SAW filter recommended
5
IF1-
High-band IF output. Open collector. “Current combiner” IF interface to 2pF internal shunt capacitance.
1000Ω SAW filter recommended
6
BYPASS Pin requires external bypass capacitor between 1nF and 47nF.
7
IF2-
Low-band IF output. Open collector. “Current combiner” IF interface to 2pF internal shunt capacitance.
1000Ω SAW filter recommended
8
IF2+
Low-band IF output. Open collector. “Current combiner” IF interface to 2pF internal shunt capacitance.
1000Ω SAW filter recommended
9
IF SEL
Logic input. High selects IF1 mixer; low selects IF2 mixer.
Diode to VCC and Ground.
CMOS logic interface.
10 LNA IP SEL Logic input. High selects external LNA current reference (pin 17); low Diode to VCC and Ground.
selects internal LNA current reference.
CMOS logic interface.
11 CELL LNA Low-band LNA input (base). Simple external matching required for best
IN
performance.
12
LNA GAIN Logic input. High selects maximum LNA gain; low selects minimum
Diode to VCC and Ground.
8
SEL
LNA gain.
CMOS logic interface.
13
VCC1
Power supply for internal references, logic, and mixer preamplifiers.
Internal RF bypass capacitor. External bypass capacitor between 1nF
and 47nF required.
14
MIX GAIN Logic input. High selects maximum mixer gain (mixer RF amp on); low Diode to VCC and Ground.
SEL
selects minimum mixer gain (mixer RF amp off).
CMOS logic interface.
15 CELL LNA Low-band LNA output (collector). Simple external L-C matching
OUT
required.
16
GND
Ground connection. See evaluation board layout.
17
LNA ISET External current reference for LNA. Resistor to ground sets LNA cur-
rent when Pin 10 is high. 20kΩ results in approximately 10mA LNA cur-
rent. Higher resistance results in lower current.
18
CELL MIX Low band mixer RF preamplifier input (base). External L-C network
IN
required for best performance.
19
PCS LO High-band buffered LO output.
OUT+
Internal DC blocking capacitor.
1kΩ shunt resistor (static bleed).
20
PCS LO High-band buffered LO output.
OUT-
Internal DC blocking capacitor.
1kΩ shunt resistor (static bleed).
21
CELL LO Low-band buffered LO output.
OUT+
Internal DC blocking capacitor.
1kΩ shunt resistor (static bleed).
22
CELL LO Low-band buffered LO output.
OUT-
Internal DC blocking capacitor.
1kΩ shunt resistor (static bleed).
23 PCS MIX IN High-band mixer RF preamplifier input (base). External L-C network
required for best performance.
24
GND
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane (low-inductance ground required for best perfor-
mance).
8-38
Rev A4 010828
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