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參數(shù)資料
| 型號： | AD8310ARMZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP LOGARITHMIC 8MSOP |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 類型： | 對數(shù)放大器 |
| 應(yīng)用： | 接收器信號強(qiáng)度指示（RSSI） |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-MSOP |
| 包裝： | 帶卷 (TR) |
AD8310
Rev. F | Page 18 of 24
OUTPUT FILTERING
LOWERING THE HIGH-PASS CORNER FREQUENCY
OF THE OFFSET COMPENSATION LOOP
For applications in which maximum video bandwidth and,
consequently, fast rise time are desired, it is essential that the
BFIN pin be left unconnected and free of any stray capacitance.
In normal operation using an ac-coupled input signal, the
OFLT pin should be left unconnected. Input-referred dc offsets
of about 1.5 mV in the signal path are nulled via an internal
offset control loop. This loop has a high-pass 3 dB corner at
about 2 MHz. In low frequency ac-coupled applications, it is
necessary to lower this corner frequency to prevent input
signals from being misinterpreted as offsets. An external
capacitor on OFLT lowers the high-pass corner to arbitrarily
low frequencies (Figure 36). For example, by using a 1 μF
capacitor, the 3 dB corner is reduced to 60 Hz.
The nominal output video bandwidth of 25 MHz can be reduced
by connecting a ground-referenced capacitor (CFILT) to the BFIN
pin, as shown in Figure 35. This is generally done to reduce out-
put ripple (at twice the input frequency for a symmetric input
waveform such as sinusoidal signals).
+4
2
μA/dB
3k
Ω
VOUT
BFIN
CFILT
AD8310
CFILT = 1/(2π× 3kΩ× VIDEO BANDWIDTH) – 2.1pF
01084-035
()
COFLT
(SEE TEXT)
AD8310
OFLT
01084-036
()
Figure 35. Lowering the Postdemodulation Video Bandwidth
CFILT is selected using the following equation:
Figure 36. Lowering the High-Pass Corner Frequency
of the Offset Control Loop
pF
1
.
2
k
3
2
1
×
Ω
×
π
=
idth
VideoBandw
CFILT
(11)
The corner frequency is set by the following equation:
The video bandwidth should typically be set at a frequency
equal to about one-tenth the minimum input frequency. This
ensures that the output ripple of the demodulated log output,
which is at twice the input frequency, is well filtered.
In many log amp applications, it might be necessary to lower
the corner frequency of the postdemodulation filtering to
achieve low output ripple while maintaining a rapid response
time to changes in signal level. An example of a 4-pole active
filter is shown in the AD8307 data sheet.
OFLT
CORNER
C
f
×
π
=
2625
2
1
(12)
where COFLT is the capacitor connected to OFLT.
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