參數(shù)資料
型號： HMC714LP5E
廠商： HITTITE MICROWAVE CORP
元件分類： 檢測器
英文描述： 100 MHz - 5800 MHz RF/MICROWAVE LINEAR DETECTOR, 15 dBm INPUT POWER-MAX
封裝： 5 X 5 MM, ROHS COMPLIANT, PLASTIC, SMT, 32 PIN
文件頁數(shù)： 28/40頁
文件大小： 1985K
代理商： HMC714LP5E
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
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Transient response can also be slewed by the RMS output if it is excessively loaded: keep load resistance above
375Ω. An optimal load resistance of approximately 500Ω to 1kΩ will allow the output to move as quickly as it is able.
For increased load drive capability, consider a buffer amplifier on the RMS output.
Using an integrating amplifier on the RMS output allows for an alternative treatment for faster settling times. An external
amplifier optimized for transient settling can also provide additional RMS filtering, when operating HMC714LP5E with
a lower CINT capacitance value.
LOG-Slope and Intercept
The HMC714LP5E provides for an adjustment of output scale by controlling the fraction of RMSA/RMSB that is
fed-back to the setpoint interface at the VSETA/VSETB pins. Log-slope and intercept can be adjusted to “magnify” a
specific portion of the input sensing range, and to fully utilize the dynamic range of the RMS output.
A log-slope of 36.5 mV/dBm is set by connecting the RMSA/RMSB outputs directly to VSETA/VSETB pins using
0Ω resistors RFBKA and RFBKB. The log-slope is adjusted by using the appropriate resistors RFBKA, RFBKB,
RSHUNTA, RSHUNTB on the RMSA/RMSB and VSETA/VSETB pins. Log-intercept is adjusted by applying a DC
voltage to the VSETA/VSETB pins through resistors RSETA and RSETB .
Due to the 15 kΩ input resistance at the VSETA/VSETB pins, moderately low resistance values should be used to
minimize the scaling errors. Very low resistor values will reduce the load driving capabilities of RMSA/RMSB outputs
while larger values will result in scaling errors and increase of the temperature errors because of the mismatch of
the on-chip and external resistor temperature coefficients.
When R
FBK
= 0 Ohm to set RMS = V
SET
, then = 1
Note: Avoid excessive loading of the RMS output; keep
C
LOAD
< 35 pF, and R
LOAD
> 375Ω
Optimized slope = * log slope
Optimized intercept = log intercept - (R
FBK
/ R
SET
) * Vzc
R
FBK
=
R
FBK
// R
SHUNT
// R
SET
0
0.5
1
1.5
2
2.5
3
3.5
4
0
50
100
150
200
250
10 dBm
0 dBm
-10 dBm
-20 dBm
-30 dBm
TIME (usec)
RMSOUT
(V)
0
0.5
1
1.5
2
2.5
3
3.5
4
0
0.5
1
1.5
2
2.5
3
10 dBm
0 dBm
-10 dBm
-20 dBm
-30 dBm
TIME (usec)
RMSOUT
(V)
Rise/Fall Characteristics, CINT = 0 pF
Rise/Fall Characteristics, CINT = 10 nF
RMS Output Interface and Transient Response (Continued)
HMC714LP5 / 714LP5E
v07.1109
DUAL RMS POWER DETECTOR
0.1 - 5.8 GHz
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