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參數資料
| 型號： | LMV248 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Dual Band GSM Power Controller |
| 中文描述： | 雙頻GSM功率控制器 |
| 文件頁數： | 6/11頁 |
| 文件大小： | 289K |
| 代理商： | LMV248 |
Application Section
Pin Description
See Figure 1 for the basics of a typical LMV248 dual band
application.
TABLE 1.
See Figure 2 for a simplified block diagram of the LMV248’s
internal architecture
Pin
Name
Description
Power Supply
5, 6
9,11, 13
1
GND
V
DD
BS
Power Ground; both pins must be tied together.
Positive Supply Voltage
Selects the RF detector input (VfA or VfB) and the corresponding output
amplifier (Out_A or Out_B) enabled when the Tx_En is HIGH. The
compensation is also connected to the correct amplifier automatically.
A HIGH input enables Out_A.
A LOW input enables Out_B.
The other unselected output is held close to GND.
A HIGH input enables the input and output amplifiers (VfA and Out_A or
VfB and Out_B) selected by the band select pin, BS.
Detector diodes for the RF power detector are connected here. An
internal switch connects a 10μA current sink to the input pin selected by
BS to bias the detector diode. This signal is referenced to V
DD
. (See
Notes 9 and 11).
The reference diode used for temperature compensation of the VfA and
VfB RF power signals is connected here. Internally, a 10μA current sink
connects to this pin to bias the reference diode. This signal is referenced
to V
DD
. (See notes 9 and 11).
Sets the RF output power level. The useful input voltage range is from
0.2V to 1.8V, although voltages from 0V to V
DD
are allowed. An internal
filter with a corner frequency of approximately 1.6MHz smooths the
Ramp signal, to eliminate step discontinuities from the baseband DAC’s
output.
Sets the desired minimum output voltage of the controller (selected by
BS) to the threshold voltage of the RF power amplifier. This reduces
ramp up time, since a smaller voltage range is slewed across. The
recommended input voltage range is from 0V to 2V.
Connect an external RC network here for overall loop compensation and
to control the closed loop frequency response. In most cases this
network will be simply a capacitor. Conventional loop stability techniques
can be used in selecting this network, such as Bode plots.
A rail-to-rail output capable of sourcing is 6mA, sinking 2mA, with less
than 200mV drop including over temperature. The output is free from
glitches when enabled by Tx_En. When an output is not selected by BS,
it is close to GND. When Tx_En is low, output voltages are near GND.
Digital Inputs
2
Tx_En
Analog Inputs
10
VfA
12
VfB
14
TC
15
Ramp
16
V
HOME
Compensation
7
Comp1
8
Comp2
Outputs
4
Out A
3
Out B
Note 9:
All inputs and outputs are referenced to GND, except VfA, VfB, and TC, which are referenced to V
DD
.
Note 10:
For the digital inputs, a LOW is
≤
0.8V and HIGH is
≥
1.8V.
Note 11:
RF power detection is usually via a RF detector diode and a RF power coupler.
L
www.national.com
6
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMV248LQ | 功能描述:IC CTROL DUAL BAND PWR 16-LLP RoHS:否 類別:RF/IF 和 RFID >> RF 電源控制器 IC 系列:- 標準包裝:3,000 系列:- RF 型:GSM 頻率:450MHz ~ 2GHz 特點:四頻帶 封裝/外殼:8-VFBGA 供應商設備封裝:8-MicroSMD（1.51x1.51） 包裝:帶卷 (TR) 其它名稱:LMV243BLX |
| LMV248LQX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual Band GSM Power Controller |
| LMV2F-3M4 | 制造商:BACO Controls Inc 功能描述: |
| LMV301 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Low Bias Current, 1.8V to 5V Single-Supply, Rail-to-Rail Operational Amplifier |
| LMV301MG | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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