Rainbow Electronics MAX2338 - Manual (Page 8)

MAX2338
Triple/Dual-Mode CDMA LNA/Mixers
8 _______________________________________________________________________________________
Pin Description
PIN NAME FUNCTION
1 RLNA
LNA Bias–Setting Resistor Connection. For nominal bias, connect a 24k Ω resistor to ground. The
value of this resistor sets the bias current for HGHL LNAs.
2 PLNAIN
High-Band RF Input. Requires a blocking capacitor which may be used as part of the input
matching network.
3, 8, 11, 18,
24, 25, 27,
Exposed
Paddle
GND
Ground Reference for RF, DC and Logic Inputs. Solder the exposed paddle evenly to the circuit
board ground plane.
4 CLNAIN
Low-Band RF Input. Requires a blocking capacitor which may be used as part of the input
matching network.
5 BAND Band-Select Logic Input. LOW selects high-band (PCS), HIGH selects low-band (cellular).
6 LIN Linearity-Select Logic Input. See Detailed Description for control modes.
7 GAIN Gain-Select Logic Input. See Detailed Description for control modes.
9 LO/2
LO Divider-Select Input. LOW disables LO divider, HIGH selects divider in cellular and FM
modes. See Detailed Description for control modes.
10 LOIN LO Input Port. Requires an external DC blocking capacitor.
12 PLOOUT
PCS LO Buffer Output Port. Internally matched to 100 Ω (nominal). Does not require a blocking
capacitor.
13 CLOOUT
Cell LO Buffer Output Port. Internally matched to 100 Ω (nominal). Does not require a blocking
capacitor. The output frequency is one half LOIN when LO/2 is floating or HIGH, and equal to
LOIN when LO/2 is LOW.
14 NC No Connection
15 FMOUT
FM Mixer Output Port. Requires pullup inductor and DC blocking capacitor, which may be used
as part of the output matching network.
16 V CC Power Supply Pin. Bypass with capacitor as close to the pin as possible.
17 BUFFEN
LO Output Buffer Enable. Drive BUFFEN HIGH to power up the LO output buffer associated with
the selected band.
19, 20 IF-, IF+
Mixer Differential Outputs. Require pullup inductors and series capacitors which can be used as
part of the output matching network.
21 RBIAS
Bias Setting Resistor Connection. For nominal bias, connect a 24k Ω resistor to ground. The value
of this resistor sets current for all blocks except HGHL LNA.
22 CMIXIN
Low-Band Mixer Input. Requires a blocking capacitor which may be used as part of the input
matching network.
23 PMIXIN
High-Band Mixer Input. Requires a blocking capacitor which may be used as part of the input
matching network.
26 PLNAOUT
High-Band LNA Output Port. Connect a pullup inductor to V CC and an external series blocking
capacitor which may be used as a part of the output matching network.
28 CLNAOUT
Low-Band LNA Output Port. Connect a pullup inductor to V CC and an external series blocking
capacitor which may be used as a part of the output matching network.