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| 型號(hào)： | RFT3100-2 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁(yè)數(shù)： | 1/2頁(yè) |
| 文件大?。?/td> | 571K |
| 代理商： | RFT3100-2 |
QUALCOMM INCORPORATED CDMA TECHNOLOGIES 5775 MOREHOUSE DR. SAN DIEGO, CA 92121-1714 http://www.cdmatech.com <cdma-technologies@qualcomm.com> T (858)658-5005 F (858)658-1556
Enabling the future of communications.
Q
TM
T x B A S E B A N D / R F P R O C E S S O R
RFT3100
R
The RFT3100 Baseband-to-
Radio Frequency (RF) Transmit
Processor performs all transmit
(Tx) signal processing functions
required between the analog
baseband and the Power
Amplifier (PA) for IS-95 Code
Division Multiple Access
(CDMA) cellular, JSTD-018
PCS, and ARIB-53 (Japan)
single-band and dual-band
applications. The RFT3100
device incorporates the
previous-generation functionality
of the IFT3000 Baseband-to-
Intermediate Frequency (IF)
Processor together with RF
upconversion and driver
amplifiers. In addition to
offering the most advanced and
integrated CDMA Tx solution
available, providing a board
area savings of more than 65
percent over previous
generation chipsets, the
RFT3100 device minimizes
power consumption for
extended talk-time performance.
The RFT3100 device is
available in three
configurations: dual-band
cellular and PCS (RFT3100-1),
cellular-only (RFT3100-2), and
PCS-only (RFT3100-3).
Utilizing an analog baseband
interface, the RFT3100 device
connects directly to
QUALCOMM’s MSM3100
and MSM3300 chipsets. The
baseband quadrature signals
are upconverted to the cellular
or PCS frequency bands and
amplified to provide signal drive
capability to the PA. The
RFT3100 device includes an IF
mixer for upconverting analog
baseband to IF, a
programmable Phase Locked
Loop (PLL) for generating Tx IF
frequency, single-sideband
upconversion from IF to RF, two
cellular and two PCS driver
amplifiers (dual-band version),
and Tx power control through
an 85 dB variable gain
amplifier (VGA). The single-
sideband upconversion also
eliminates the need for a
Figure 1. RFT3100 Processor Functional Block Diagram
PLL
SBCK
SBDT
SBST
AB_SEL
PA_ON
DAC_IREF
TX_Q
TX_QN
90
0
Σ
TX_I
TX_IN
VCONTROL
1/2
VDDA
VDDD
VDDM
VDDRF
CELLA_OUT
CELLB_OUT
PCSA_OUT
PCSB_OUT
R
I
T
T
P
P
T
L
I
SSB
SBI &
CONTROL
RFT3100 OVERVIEW
T
TM
bandpass filter normally
required between the
upconverter and driver
amplifier, providing overall
board area and cost savings.
RFT3100 functionality is
specifically controlled from the
MSM device via the three-line
serial bus interface (SBI).
Designed to meet the
requirements for global CDMA
markets, the RFT3100 device
will operate over the following
Tx frequency ranges:
Cellular band
824 MHz - 925 MHz
PCS band
1750 MHz - 1910 MHz
The range of supply voltage
for the RFT3100 device is from
2.7 V to 3.3 V, which provides
operating compatibility for
platforms utilizing a single-cell
Li-Ion battery design. RFT3100
operating modes are controlled
by the MSM and include
selective power-down, gain
control, and punctured CDMA
transmission (gated Tx power)
for optimal power savings and
talk-time improvement.
The RFT3100 device is
fabricated on an advanced
BiCMOS process, which
accommodates both precision
high-frequency analog circuits
and low-power CMOS functions,
and is available in a 32-pad
BCC++ plastic package.
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