CX74005 View Datasheet(PDF) - Conexant Systems
Part Name
Description
View to exact match
CX74005 Datasheet PDF : 2 Pages
| |||
wireless communications products
VGA+l /Q
Demodulator RFlC
CX74005
Conexant Delivers RF Chipsets
for 2G and 3G CDMA Applications
The CX74005 RFIC is a variable gain amplifier (VGA) and In-phase
and Quadrature (I/Q) modulator, intended for use in code division
multiple access (CDMA) portable phones in the cellular and
Personal Communications System (PCS) bands. As a dual-mode
IC, it can be used in CDMA mode or advanced mobile phone
system (AMPS) mode. In addition, this device can be used for
wideband CDMA (WCDMA) applications in the IMT-2000 band.
The intermediate frequencies (IF) are combined through separate
buffers at the input of the VGA, depending on the selected mode.
The VGA has a gain control range greater than 90 dB. The device
has two very high-frequency (VHF) oscillators that operate with
external tank circuits. They provide signals to the local oscillator
(LO) for the I /Q demodulator in the cellular and PCS bands.
The I/Q demodulator provides a superior gain and phase balance
of typically less than 0.2 dB gain and 2º phase imbalances.
Employing silicon bipolar technology, the CX74005 is designed
for high performance and a high level of integration.
The CX74005, along with Conexant’s CX74002 Transmit RFIC,
CX74004 LNA/mixer RFIC, a Conexant power amplifier module and
Conexant’s baseband processor forms a complete RF subsystem
that interfaces with the most common cdma baseband devices.
Distinguishing Features
• Tri-mode, dual-band functionality
• Superior gain and phase balance in the
I/Q demodulator (0.2 dB + 2º typical)
• 90 dB of dynamic range in the variable
gain amplifier
• Three battery-cell operation
(2.7V < VCC < 3.6V)
• IF inputs and I/Q outputs
• On-chip 100 to 640 MHz oscillators
• Low-power operation: <20 mA
• 5mm x5mm land grid array (LGA)
chipscale package
Share Link: 