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參數(shù)資料
| 型號： | AD8307ARZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP LOGARITHMIC 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 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-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
AD8307
Rev. D | Page 19 of 24
SLOPE AND INTERCEPT ADJUSTMENTS
Where higher calibration accuracy is needed, the adjustments
shown in Figure 37 can be used, either singly or in combination.
The log slope is lowered to 20 mV/dB by shunting the nominally
12.5 kΩ on-chip load resistor (see Figure 31) with 50 kΩ, adjusted
by VR1. The calibration range is ±10% (18 mV/dB to 22 mV/dB),
including full allowance for the variability in the value of the
internal load. The adjustment can be made by alternately applying
two input levels, provided by an accurate signal generator, spaced
over the central portion of the log amp’s dynamic range, for
example, 60 dBm and 0 dBm. An AM modulated signal at the
center of the dynamic range can also be used. For a modulation
depth, M, expressed as a fraction, the decibel range between the
peaks and troughs over one cycle of the modulation period is
given by
M
dB
+
=
Δ
1
log
20
10
(7)
For example, using an rms signal level of 40 dBm with a 70%
modulation depth (M = 0.7), the decibel range is 15 dB, as the
signal varies from 47.5 dBm to 32.5 dBm.
The log intercept is adjustable over a ±3 dB range, which is
sufficient to absorb the worst-case intercept error in the AD8307,
plus some system level errors. For greater range, set RS to zero.
VR2 is adjusted while applying an accurately known CW signal
near the lower end of the dynamic range to minimize the effect
of any residual uncertainty in the slope. For example, to position
the intercept to 80 dBm, a test level of 65 dBm can be applied
and VR2 adjusted to produce a dc output of 15 dB above zero at
25 mV/dB, which is 0.3 V.
01
08
2-
0
37
C2 = CC
C1 = CC
20mV/dB
±10%
AD8307
INPUT
–75dBm TO
+16dBm
INP VPS ENB INT
INM COM OFS OUT
NC
NC = NO CONNECT
87
6
5
23
4
1
4.7
VR2
50k
RS
0.1F
VP, 2.7V TO 5.5V
AT ~8mA
±3dB
VR1
50k
32.4k
FOR VP = 3V, RS = 20k
VP = 5V, RS = 51k
Figure 37. Slope and Intercept Adjustments
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| AD8307ARZ-RL7 | 功能描述:IC AMP LOGARITHMIC 8-SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:可變增益放大器 應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
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| AD8309ARU-REEL | 制造商:Analog Devices 功能描述: |
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