Preliminary
8-127
RF2488
Rev A0 010905
8
Pin
Function
Description
Interface Schematic
1Low LNA
GND
Low band LNA ground connection. As an option, an external inductor to
ground may be used to reduce LNA gain.
See pin 3.
2GAIN SEL
CMOS compatible signal controlling both the low band and high band
LNA gain. Logic (0) = Low Gain, Logic (1)=High Gain.
3Low 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.
4High 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.
5High LNA
GND
High band LNA ground connection. Immediate grounding required
adjacent to pin.
See pin 4.
6High LNA
VCC
High band LNA supply voltage. Local bypass capacitor required.
7High LNA
OUT
High band LNA Output. Bias for the LNA is provided through this pin,
hence it should be connected to VCC through an inductor.
See pin 4.
8GND
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 8
Ω
real and requires external matching to 50
Ω.
11
NC
12
High LO IN
High band local oscillator input. This pin is internally AC-coupled and
matched to 50
Ω.
See pin 19.
13
IF2-
IF output. Open collector output, requires external matching compo-
nents and DC connection to VCC.
14
IF2+
IF output. Open collector output, requires external matching compo-
nents and DC connection to VCC.
See pin 13.
15
MXR VCC
Mixer supply voltage. Local bypass capacitor required.
Low LNA GND
Low LNA OUT
Low LNA IN
High LNA GND
High LNA OUT
High LNA IN
High MIX IN
IF2+
IF2-
1pF
1pF
1pF
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