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LMH2100TM Datasheet

  • LMH2100TM

  • National Semiconductor [50 MHz to 4 GHz 40 dB Logarithmic P...

  • NSC

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LMH2100 50 MHz to 4 GHz 40 dB Logarithmic Power Detector for CDMA and WCDMA
November 28, 2007
LMH2100
50 MHz to 4 GHz 40 dB Logarithmic Power Detector for
CDMA and WCDMA
General Description
The LMH2100 is a 40 dB RF power detector intended for use
in CDMA and WCDMA applications. The device has an RF
frequency range from 50 MHz to 4 GHz. It provides an accu-
rate temperature and supply compensated output voltage that
relates linearly to the RF input power in dBm. The circuit op-
erates with a single supply from 2.7V to 3.3V.
The LMH2100 has an RF power detection range from 鈭?5
dBm to 鈭? dBm and is ideally suited for direct use in combi-
nation with a 30 dB directional coupler. Additional low-pass
filtering of the output signal can be realized by means of an
external resistor and capacitor. Figure (a) shows a detector
with an additional output low pass filter. The filter frequency
is set with R
S
and C
S
.
Figure (b) shows a detector with an additional feedback low
pass filter. Resistor R
P
is optional and will lower the Trans
impedance gain (R
TRANS
). The filter frequency is set with
C
P
//C
TRANS
and R
P
//R
TRANS
.
The device is active for Enable = High, otherwise it is in a low
power consumption shutdown mode. To save power and pre-
vent discharge of an external filter capacitance, the output
(OUT) is high-impedance during shutdown.
The LMH2100 power detector is offered in the small 0.4 mm
pitch micro SMD package.
Features
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
40 dB linear in dB power detection range
Output voltage range 0.3 to 2V
Shutdown
Multi-band operation from 50 MHz to 4 GHz
0.5 dB accurate temperature compensation
External configurable output filter bandwidth
0.4 mm-pitch micro SMD package
Applications
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
UMTS/CDMA/WCDMA RF power control
GSM/GPRS RF power control
PA modules
IEEE 802.11b, g (WLAN)
Typical Application
30014071
30014004
(a) LMH2100 with Output RC Low Pass Filter
(b) LMH2100 with Feedback (R)C Low Pass Filter
漏 2007 National Semiconductor Corporation
300140
www.national.com

LMH2100TM 產(chǎn)品屬性

  • 50MHz 到 4GHz

  • CDMA, GPRS, GSM, UMTS, WCDMA, WLAN

  • -45dBm 至 -5dBm

  • 7.1mA

  • 2.7V 到 3.3V

  • Bump

  • 6

  • -40°C 到 +85°C

  • No SVHC (19-Dec-2011)

  • 2100

  • Micro Bump

  • Micro Bump

  • -40°C

  • 85°C

  • 3.3V

  • 2.7V

  • 表面安裝

  • 3.3V

  • 7.1mA

  • 2V

  • 7.3A

  • 4GHz

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