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LMV242LDX Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LMV242LDX Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 16 page Bond Pad mechanical Dimensions X/Y Coordinates Pad Size Signal Name Pad Number X Y X Y Out 1 1 −281 617 92 92 Out 2 2 −281 490 92 92 Comp2 3 −281 363 92 92 V DD 4 −281 236 92 92 RF IN 5 −281 −617 92 92 V RAMP 6 281 −617 92 92 TX_EN 7 281 −360 92 92 BS 8 281 −118 92 92 Comp1 9 281 20 92 92 GND 10 281 187 92 92 Note: Dimensions of the bond pad coordinates are in µm Origin of the coordinates: center of the die Coordinates refer to the center of the bond pad Pin Descriptions Pin Name Description Power Supply 4 V DD Positive Supply Voltage 10 GND Power Ground Digital Inputs 7 TX_EN Schmitt-triggered logic input. A LOW shuts down the whole chip for battery saving purposes. A HIGH enables the chip. 8 BS Schmitt-triggered Band Select pin. When BS = H, channel 1 (OUT1) is selected, when BS = L, channel 2 (OUT2) is selected. Analog Inputs 5 RF IN RF Input connected to the Coupler output with optional attenuation to measure the Power Amplifier (PA) / Antenna RF power levels. 6V RAMP 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. Compensation 9 Comp1 Connects an external RC network between the Comp1 pin and the Comp2 pin for an overall loop compensation and to control the closed loop frequency response. Conventional loop stability techniques can be used in selecting this network, such as Bode plots. A good starting value for the RC combination will beC=68pFandR=0 Ω. 3 Comp2 Frequency compensation pin. The BS signal switches this pin either to OUT1 or to OUT2. Output 1 Out1 This pin is connected to the PA of either channel 1 or channel 2. 2 Out2 Note: 1. All inputs and outputs are referenced to GND (pin 10). 2. For the digital inputs, a LOW is < 0.8V and a HIGH is > 1.8V. 3. RF power detection is performed internally in the LMV242 and only an RF power coupler with optional extra attenuation has to be used. www.national.com 5 |
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