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參數(shù)資料
| 型號： | AD602JCHIPS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | Dual, Low Noise, Wideband Variable Gain Amplifiers |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, UUC |
| 封裝： | DIE |
| 文件頁數(shù)： | 25/28頁 |
| 文件大小： | 432K |
| 代理商： | AD602JCHIPS |
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AD600/AD602
Rev. E | Page 25 of 28
5
3
–5
4
2
0
1
–1
–3
–2
–4
L
1μ
10μ
10
1
100m
10m
1m
100μ
INPUT SIGNAL (V rms)
0
Figure 52. V
LOG
Is Linear over the Full 120 dB Range
Figure 52 shows V
LOG
to be linear over a full 120 dB range.
Figure 53 shows the error ripple due to the individual gain
functions bounded by ±0.2 dB (dotted lines) from 6 μV to 2 V.
The small perturbations at about 200 μV and 20 mV, caused by
the impracticality of matching the gain functions perfectly, are
the only sign that the gains are now sequential. Figure 54 is a
plot of V
AGC
that remains very close to its set value of 316 mV
rms over the full 120 dB range.
To compare the SNRs in the simultaneous and sequential
modes of operation more directly, all interstage attenuation was
eliminated (R2 and R3 in Figure 47 and R2 in Figure 51), the
input of U1A was shorted, R5 was selected to provide a 20 kHz
bandwidth (R5 = 7.87 kΩ), and only the gain control was
varied, using an external source. The rms value of the noise was
then measured at V
OUT
and expressed as an SNR relative to
0 dBV, which is almost the maximum output capability of the
AD600. Results for the simultaneous mode can be seen in
Figure 55. The SNR degrades uniformly as the gain is increased.
Note that since the inverting gain control was used, the gain in
this curve and in Figure 56 decreases for more positive values of
the gain-control voltage.
2.0
–2.0
0.5
1.0
1.5
–1.5
–1.0
–0.5
G
–0.2
0.2
0
1μ
10μ
10
1
100m
10m
1m
100μ
INPUT SIGNAL (V rms)
0
Figure 53. Error Ripple due to the Individual Gain Functions
400
300
200
350
250
G
1μ
10μ
10
1
100m
10m
1m
100μ
INPUT SIGNAL (V rms)
0
Figure 54. V
AGC
Remains Close to Its Setpoint of
316 mV rms over the Full 120 dB Range
90
0
833.2
20
10
–625.0
–833.2
30
40
50
60
70
80
625.0
416.6
208.3
0
–208.3
–416.6
V
C
(mV)
S
0
V
C
SCALE = 10.417mV/dB
Figure 55. SNR vs. Control Voltage for Parallel Gain Control (See Figure 47)
In contrast, the SNR for the sequential mode is shown in Figure 56.
U1A always acts as a fixed noise source; varying its gain has no
influence on the output noise. This is a feature of the X-AMP
technique. Therefore, for the first 40 dB of control range
(actually slightly more, as is explained later), when only this
VCA section has its gain varied, the SNR remains constant.
During this time, the gains of U1B and U2A are at their
minimum value of 1.07 dB.
V
C
(V)
90
0
3.817
20
10
–0.558
–1.183
30
40
50
60
70
80
3.192
2.567
1.942
1.317
0.692
0.067
S
0
V
C
SCALE = 31.25mV/dB
Figure 56. SNR vs. Control Voltage for Sequential Gain Control (See Figure 51)
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| AD602JR | 功能描述:IC AMP VGA DUAL LN 50MA 16SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:X-AMP® 標準包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SOIC 包裝:帶卷 (TR) |
| AD602JR-REEL | 制造商:Analog Devices 功能描述:SP Amp Variable Gain Amp Dual ±5.25V 16-Pin SOIC W T/R |
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