參數(shù)資料
型號(hào)： LTC5583IUF#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24
封裝： 4 X 4 MM, LEAD FREE, PLASTIC, MO-220WGGD-X, QFN-24
文件頁(yè)數(shù)： 14/28頁(yè)
文件大?。?/td> 1136K
代理商： LTC5583IUF#TRPBF
LTC5583
21
5583fa
Figure 7. Simplified Circuit Schematic of the RMS
Power Detector Output Interface
5583 F07
LTC5583
RSS
50Ω
VOA
OR
VOB
INPUT
VCC
CLOAD
VOUT
RMS Power Detector Output: VOA, VOB
The output buffer amplifier of the LTC5583 is shown in
Figure 7. This Class-AB buffer amplifier can output ±5mA
current to the load. The output impedance is determined
primarily by the 50Ω series resistor connected to the buffer
amplifier inside the chip. This will prevent any overstress
on the internal devices in the event that the output is
shorted to ground.
The –3dB small-signal bandwidth of the buffer amplifier
is about 22.4MHz and the full-scale rise/fall time can be
as fast as 140ns, limited by the slew rate of the internal
circuit instead. When the output is resistively terminated
or open, the fastest output transient response is achieved
when a large signal is applied to the RF input. The rise time
of the LTC5583 is about 140ns and the fall time is 3.5μs,
respectively, for full-scale pulsed RF input power with
8.2nF filtering capacitors. The speed of the output transient
response is dictated mainly by the filtering capacitors (at
least 8nF) at the FLTA and FLTB pins. See the detailed output
transient response in the Typical Performance Character-
istics section. When the RF input has AM content, residual
ripple may be present at the output depending upon the
low frequency content of the modulated RF signal. This
ripple can be reduced with a larger filtering capacitor at
the expense of a slower transient response.
APPLICATIONS INFORMATION
Since the output buffer amplifier of the LTC5583 is capable
of driving an arbitrary capacitive load, the residual ripple
can be further filtered at the output with a series resistor
RSS and a large shunt capacitor CLOAD (see Figure 7). This
lowpass filter also reduces the output noise by limiting the
output noise bandwidth. When this RC network is designed
properly, a fast output transient response can be maintained
with reduced residual ripple. For example, we can estimate
CLOAD with an output voltage swing of 1.7V at 2140MHz.
In order to not allow the maximum 5mA sourcing current
to limit the fall time (about 5μs), the maximum value of
CLOAD can be chosen as follows:
CLOAD ≤ 5mA Allowable Additional Time/1.7V
= 5mA 0.25μs/1.7V = 735pF
Once CLOAD is determined, RSS can be chosen properly
to form an RC low-pass filter with a corner frequency of
1/[2π (RSS + 50) CLOAD].
In general, the rise time of the LTC5583 is much shorter
than the fall time. However, when the output RC filter is
used, the rise time may be dominated by the time constant
of this filter. Accordingly, the rise time becomes very similar
to the fall time. Although the maximum sinking capability
of the LTC5583 is 5mA, it is recommended that the output
load resistance should be greater than 1.2k in order to
achieve the full output voltage swing.
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