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參數(shù)資料
| 型號(hào)： | RF2488 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 衰減器 |
| 英文描述： | MULTI-MODE DUAL-BAND LNA MIXER |
| 中文描述： | RF/MICROWAVE DOWN CONVERTER |
| 文件頁數(shù)： | 7/22頁 |
| 文件大?。?/td> | 483K |
| 代理商： | RF2488 |
Preliminary
8-129
RF2488
Rev A0 010905
8
F
Detailed Desc ription
The RF2488 is fabricated on a high performance Silicon Germanium process that allows optimization of key RF param-
eters (including noise figure, gain and linearity) for very low current consumption. The RF2488 is packaged in a small 24-
pin, 4mmx4mm, leadless chip carrier. It can be operated on a single supply voltage from 2.7V to 3.3V. To reduce power
consumption the RF2488 has a standby mode that draws less than 10uA.
The RF2488 has two frequency bands of operation. Each is comprised of an LNA and two downconverting mixers with
combined RF inputs, and two separate intermediate frequency outputs. The LNA outputs and mixer RF inputs are typi-
cally connected through an image reject SAW filter, which provides image rejection and out-of-band blocking with low in-
band insertion loss. Either of the two IF outputs can be selected whether operating in low band or high band mode. This
feature allows different IF frequencies and SAW filters to be used for different air interfaces in multi-mode phones. The
modes are selected using the external BAND SEL and IF SEL pins; these can be switched using standard CMOS logic
levels.
LNA
There are two LNA circuits: one for high band and one for low band. They have two gain conditions: high gain and low
gain. The gain state is selected using the external GAIN SEL pin that can be switched with standard CMOS logic levels.
The LNAs require a DC-blocking capacitor at the input and an inductor to ground; the inductor is used to provide addi-
tional input linearity and can be removed if the linearity is not required. The LNA output requires an output match, which
is determined by the input impedance of the IR SAW filter (typically 50
). The match must include an inductor to supply
to provide the LNA with a DC path to V
CC
.
In high gain mode, the low band LNA exhibits 18dB of gain combined with a noise figure of <1.4dB and a input IP3 (IIP3)
of 3dB. In low gain mode, the device switches to a highly linear state, with IIP3 in excess of 20dBm and a gain of -9dB
with a current drain of less than 500uA.
In high gain mode, the high band LNA exhibits 17dB of gain combined with a noise figure of <1.7dB and a IIP3 of 2dB.
In low gain mode, the device switches to a highly linear state, with IIP3 in excess of 15dBm and a gain of -6dB with a cur-
rent drain of less than 500uA.
Mixers
The mixers are all single-balanced mixers, with low noise figure, high linearity and high gain. The RF input match can be
tuned for a wide range of RF input frequencies. In low band mode, the match consists of an inductive choke to ground
and a 7
to 50
step up input match. In high band mode, the match consists of a resonant circuit that provides a DC
choke to ground and a 7
to 50
step up input match.
The LO input port is internally matched to 50
and is internally DC-blocked for easy interface across a wide bandwidth.
The LO input can be driven with signals as low as -9dBm with no performance degradation. The matching of the IF out-
puts is discussed in the applications section.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RF2488-000 | 制造商:TE Connectivity 功能描述:TRF250-090UT - Bag |
| RF2489 | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:DUAL-BAND/TRI-MODE CDMA LOW NOISE AMPLIFIER/MIXER |
| RF2489_07 | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:DUAL-BAND/TRI-MODE CDMA LOW NOISE AMPLIFIER/MIXER |
| RF2489-000 | 制造商:TE Connectivity 功能描述:TRF250-110UT - Bag |
| RF2489PCBA-41X | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:DUAL-BAND/TRI-MODE CDMA LOW NOISE AMPLIFIER/MIXER |
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