CX74001 View Datasheet(PDF) - Skyworks Solutions
Part Name
Description
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CX74001 Datasheet PDF : 23 Pages
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CX74001
Pin #
Name
1
LNA_CTRL1
Rx ASIC for CDMA, AMPS, and PCS Applications
Table 1. CX74001 Pin Assignments and Signal Descriptions (1 of 4)
Description
Digital signal used in conjunction with pin 3 to control LNA gain step. DO NOT ALLOW TO
FLOAT OR LEAVE UNCONNECTED
Equivalent Circuit
Vcc
2
PCS_LNAIN
PCS LNA input pin. High-Q matching network should be used to minimize noise figure, and a
DC blocking capacitor is required.
3
LNA_CTRL0
Digital signal used in conjunction with pin 1 to control LNA gain step. DO NOT ALLOW TO
FLOAT OR LEAVE UNCONNECTED
Vcc
4
CELL_LNA_IN
Cellular LNA input pin. High-Q matching network should be used to minimize noise figure, and
a DC blocking capacitor is required.
5
VCC_RF_BIAS
6
CELL_LNA_EMIT
Supply voltage to the RF bias (needed by all LNA/Mixer blocks) . An RF bypass capacitor
should be connected from the pin to ground with minimal trace length.
Ground directly to ground with minimum trace length.
7
CELL/PCS
8
FM/CDMA
9
VCO_VCC
10 VCO_ON
11 CELL_TANK–
12 CELL_TANK+
13 PCS_TANK–
14 PCS_TANK+
15 LOD
Digital signal used for band selection: 0 = cellular (800 MHz), 1 = PCS (1900 MHz).
Digital signal used in cellular band for mode selection: 0 = AMPS, 1 = CDMA.
Voltage supply to the VCO buffers. A bypass capacitor should be placed close to the device
from pin 9 to ground with minimal trace length.
VCO control signal to turn VCO and PLL buffer ON/OFF during slotted paging modes, thereby
increasing standby time.
Differential tank cellular band VCO pin. Care should be taken during the layout of the external
–
tank circuit to prevent parasitic oscillations.
+
Differential tank cellular band VCO pin. Care should be taken during the layout of the external
tank circuit to prevent parasitic oscillations.
Differential tank PCS band VCO pin. Care should be taken during the layout of the external
tank circuit to prevent parasitic oscillations.
Differential tank PCS band VCO pin. Care should be taken during the layout of the external
tank circuit to prevent parasitic oscillations.
Linearity On Demand. It provides the bias control for the mixers, thereby reducing the chip
current consumption at the expense of input IP3.
4
Skyworks
101134A
Proprietary Information and Specifications are Subject to Change
March 5, 2002
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