lmh2120umx National Semiconductor Corporation, lmh2120umx Datasheet
lmh2120umx
Available stocks
Related parts for lmh2120umx
lmh2120umx Summary of contents
Page 1
... To save power and pre- vent discharge of an external filter capacitance, the output (OUT) is high impedance during shutdown. The LMH2120 power detector is offered in a tiny 6-bump micro SMD package. Typical Application © 2010 National Semiconductor Corporation LMH2120 Features ■ Linear root mean square response ■ ...
Page 2
Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage V - GND DD RF Input Input power DC Voltage Enable (EN) Input Voltage V ESD Tolerance ...
Page 3
Symbol Parameter v Output Referred Noise Integrated n (Note 8) Timing Characteristics t Turn-on Time from shutdown ON t Rise Time R t Fall Time F RF Detector Transfer, fit range -15 dBm to -5 dBm for Linear Slope and ...
Page 4
Symbol Parameter (Note 1900 MHz IN P Minimum Power Level, bottom MIN end of Dynamic Range P Maximum Power Level, top end MAX of Dynamic Range V Minimum Output Voltage MIN V Maximum Output Voltage MAX K ...
Page 5
Symbol Parameter DR Dynamic Range for specified Accuracy Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is ...
Page 6
... C2 EN Analog Input B1 RF Output A2 OUT Ordering Information Package Part Number LMH2120UM 6-Bump micro SMD LMH2120UMX www.national.com 6-Bump micro SMD 30055702 Top View 6–Bump microSMD Marking 30055792 Top View X = Date Code T = Die Traceability R = LMH2120UM Positive Supply Voltage. DD Ground. Both C1 and B2 need to be connected to GND. ...
Page 7
Block Diagram LMH2120 7 30055703 www.national.com ...
Page 8
Typical Performance Characteristics RF = 1900 MHz CW (Continuous Wave, unmodulated). Specified errors are input referred. IN Supply Current vs. Supply Voltage (Active) Supply Current vs. Enable Voltage (EN) Output Sourcing Current vs. RF Input Power www.national.com Unless otherwise specified ...
Page 9
RF Input Impedance vs. Frequency, Resistance (R) and Reactance (X) 30055765 Output Voltage Noise vs. Frequency 30055764 Lin Intercept vs. Frequency 30055716 Power Supply Rejection Ratio vs. Frequency Lin Slope vs. Frequency Output Voltage vs. RF Input Power 9 30055763 ...
Page 10
Output Voltage vs. Frequency Lin Conformance vs. RF Input Power at 50 MHz Temperature Variation vs. RF Input Power at 50 MHz www.national.com Output Voltage vs. RF Input Power at 50 MHz 30055718 Lin Conformance (50 units) vs. RF Input ...
Page 11
Output Voltage vs. RF Input Power at 900 MHz Lin Conformance (50 units) vs. RF Input Power at 900 MHz Temperature Variation (50 units) vs. RF Input Power at 900 MHz Lin Conformance vs. RF Input Power at 900 MHz ...
Page 12
Power Step Error vs. RF Input Power at 900 MHz LTE variation vs. RF Input Power at 900 MHz Lin Conformance vs. RF Input Power at 1900 MHz www.national.com W-CDMA variation vs. RF Input Power at 900 MHz ...
Page 13
Temperature Variation vs. RF Input Power at 1900 MHz 1 dB Power Step Error vs. RF Input Power at 1900 MHz W-CDMA variation vs. RF Input Power at 1900 MHz Temperature Variation (50 units) vs. RF Input Power at 1900 ...
Page 14
Output Voltage vs. RF Input Power at 2600 MHz Lin Conformance (50 units) vs. RF Input Power at 2600 MHz Temperature Variation (50 units) vs. RF Input Power at 2600 MHz www.national.com Lin Conformance vs. RF Input Power at 2600 ...
Page 15
Lin Conformance vs. RF Input Power at 3500 MHz Temperature Variation vs. RF Input Power at 3500 MHz Output Voltage vs. RF Input Power at 5800 MHz Lin Conformance (50 units) vs. RF Input Power at 3500 MHz 30055748 Temperature ...
Page 16
Temperature Variation vs. RF Input Power at 5800 MHz www.national.com 30055754 16 ...
Page 17
Application Information The LMH2120 Linear RMS power detector partic- ularly suited for accurate power measurements of modulated RF signals that exhibit large peak-to-average ratios (PAR’s). The RMS detector implements the exact definition of power resulting in ...
Page 18
For more complex waveforms it is not always easy to deter- mine the exact relationship between RMS value and peak value. A peak measurement can therefore become impracti- cal. An approximation can be used for the V relationship, but it ...
Page 19
For measuring the RMS (power) level of a signal, the time average of the squared signal needs to be measured as de- scribed in section ACCURATE POWER This is implemented in the LMH2120 by means of a multiplier and a ...
Page 20
This can be done by selecting a directional coupler with the appropriate coupling factor. Since the LMH2120 has a constant input impedance, a re- sistive divider can also be used instead of a directional cou- pler (Figure 5). FIGURE ...
Page 21
This is because the capacitor C doesn’t need to be fully recharged each cy- S cle. Supply The LMH2120 has an internal LDO to handle supply voltages between 2.7V to 5V. This enables ...
Page 22
FIGURE 8. E vs. RF input Power at 1900 MHz LC Variation over Temperature Error In contrast to the linear conformance error, the variation over temperature error (E ) purely measures the error due to VOT temperature variation. The measured ...
Page 23
FIGURE 11. Graphical Representation Step Error Calculations Figure 12 shows the typical 10 dB step error at 1900 MHz, where a dynamic range obtained for E FIGURE 12 Step Error vs. ...
Page 24
FIGURE 15. Linear Conformance Error vs. RF Input Power at 1900 MHz FIGURE 16. Temperature Variation vs. RF Input Power at 1900 MHz www.national.com LAYOUT RECOMMENDATIONS As with any other RF device, careful attention must be paid to the board ...
Page 25
Physical Dimensions inches (millimeters) unless otherwise noted 6-Bump microSMD NS Package Number UMD06AAA X1 = 0.825 mm ± 0.030 1.225 mm ± 0.030 0.425 mm ± 0.045 mm 25 www.national.com ...
Page 26
... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...