RF2488 Ver la hoja de datos (PDF) - RF Micro Devices
Número de pieza
componentes Descripción
Fabricante
RF2488 Datasheet PDF : 22 Pages
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RF2488
Preliminary
Pin Function Description
Interface Schematic
16
IF1-
IF output. Open collector output, requires external matching compo-
nents and DC connection to VCC.
IF1+
IF1-
1 pF
1 pF
1 pF
17
IF1+
IF output. Open collector output, requires external matching compo- See pin 16.
nents and DC connection to VCC.
18 BAND SEL This CMOS compatible pin controls the selection of the low or high
band signal path (See the State Control Truth Table). Local bypass
capacitor required.
19 Low LO IN LO band local oscillator input. This pin is AC-coupled and matched to
50 Ω.
LO IN
500 Ω
8
20
TX/RX
This CMOS compatible TX/RX mode select Power Control Pin. CMOS
compatible signal controlling the functional state of the device (See the
State Control Truth Table). Local bypass capacitor required.
21 Low MIX IN Low band RF mixer input. Although the base of the mixer input transis-
tor is AC coupled, this pin serves a dual purpose of providing a DC bias
path via external inductor to GND. The typical input impedance is 8Ω
Low MIX IN
real and requires external matching to 50Ω.
22
VCC BIAS Bias supply voltage. Local bypass capacitor required.
23
Low LNA Low band LNA output. Bias for the LNA is provided through this pin, See pin 3.
OUT
hence it should be connected to VCC through and inductor.
24
Low LNA Low band LNA RF supply voltage. Local bypass capacitor required.
VCC
RF2488 State Control Truth Table
State
0
1
2
3
4
5
6
7
TX/RX
0
0
0
0
1
1
1
1
Band Sel
0
0
1
1
0
0
1
1
IF Out Sel
0
1
0
1
0
1
0
1
Active Circuits
Low Band LNA, IF1 Mixer
Low Band LNA, IF2 Mixer
High Band LNA, IF1 Mixer
High Band LNA, IF2 Mixer
All Off
All Off
All Off
All Off
8-128
Rev A0 010905
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