RF2488 View Datasheet(PDF) - RF Micro Devices
Part Name
Description
Manufacturer
RF2488 Datasheet PDF : 22 Pages
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Preliminary
RF2488
Pin Function Description
Interface Schematic
1
Low LNA Low band LNA ground connection. As an option, an external inductor to See pin 3.
GND
ground may be used to reduce LNA gain.
2
GAIN SEL CMOS compatible signal controlling both the low band and high band
LNA gain. Logic (0)=Low Gain, Logic (1)=High Gain.
3 Low LNA IN Low band LNA input. The maximum VSWR is 2:1 (Cell/GSM RX band)
for both the gain and bypass mode. This pin is internally DC-biased
and should be DC blocked with a capacitor suitable for the frequency of
operation.
Low LNA IN
Low LNA OUT
4 High LNA IN High band LNA input. The maximum VSWR is 2:1 (DCS/PCS RX band)
for both the gain and bypass mode. This pin is internally DC-biased
and should be DC blocked with a capacitor suitable for the frequency of
operation.
High LNA IN
Low LNA GND
High LNA OUT
5
High LNA High band LNA ground connection. Immediate grounding required
See pin 4.
GND
adjacent to pin.
6
High LNA High band LNA supply voltage. Local bypass capacitor required.
VCC
7
High LNA High band LNA Output. Bias for the LNA is provided through this pin, See pin 4.
OUT
hence it should be connected to VCC through an inductor.
8
GND
Direct connection to ground.
9 IF OUT SEL IF output select state control pin. This CMOS compatible signal con-
trols the selection of the IF mixer output path (see the State Control
Truth Table). Local bypass capacitor required.
10 High MIX IN High 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
High MIX IN
real and requires external matching to 50Ω.
High LNA GND
8
11
NC
12 High LO IN High band local oscillator input. This pin is internally AC-coupled and See pin 19.
matched to 50Ω.
13
IF2-
IF output. Open collector output, requires external matching compo-
nents and DC connection to VCC.
IF2+
IF2-
1 pF
1 pF
1 pF
14
IF2+
IF output. Open collector output, requires external matching compo- See pin 13.
nents and DC connection to VCC.
15
MXR VCC Mixer supply voltage. Local bypass capacitor required.
Rev A0 010905
8-127
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