參數(shù)資料
型號(hào)： AD600ARZ-RL
廠(chǎng)商： Analog Devices Inc
文件頁(yè)數(shù)： 9/33頁(yè)
文件大?。?/td> 0K
描述： IC AMP VGA DUAL LN 50MA 16SOIC
標(biāo)準(zhǔn)包裝： 1,000
系列： X-AMP®
放大器類(lèi)型： 可變?cè)鲆?br>
電路數(shù)： 2
轉(zhuǎn)換速率： 275 V/µs
-3db帶寬： 35MHz
電流 - 輸入偏壓： 350nA
電流 - 電源： 11mA
電流 - 輸出 / 通道： 50mA
電壓 - 電源，單路/雙路(±)： ±4.75 V ~ 5.25 V
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 16-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC W
包裝： 帶卷 (TR)
AD600/AD602
Rev. F | Page 16 of 32
REALIZING OTHER GAIN RANGES
Larger gain ranges can be accommodated by cascading
amplifiers. Combinations built by cascading two amplifiers
include 20 dB to +60 dB (using one AD602), 10 dB to +70 dB
(using of an AD602 followed by of an AD600), and 0 dB to
80 dB (using one AD600). In multiple-channel applications,
extra protection against oscillation can be provided by using
amplifier sections from different packages.
ULTRALOW NOISE VCA
The two channels of the AD600 or AD602 can operate in
parallel to achieve a 3 dB improvement in noise level, providing
1 nV/√Hz without any loss of gain accuracy or bandwidth.
In the simplest case, as shown in Figure 35, the signal inputs,
A1HI and A2HI, are tied directly together. The outputs, A1OP
and A2OP, are summed via R1 and R2 (100 Ω each), and the
control inputs, C1HI/C2HI and C1LO/C2LO, operate in
parallel. Using these connections, both the input and output
resistances are 50 Ω. Thus, when driven from a 50 Ω source and
terminated in a 50 Ω load, the gain is reduced by 12 dB, so the
gain range becomes –12 dB to +28 dB for the AD600 and 22 dB
to +18 dB for the AD602. The peak input capability remains
unaffected (1 V rms at the IC pins, or 2 V rms from an
unloaded 50 Ω source). The loading on each output, with a
50 Ω load, is effectively 200 Ω because the load current is
shared between the two channels, so the overall amplifier still
meets its specified maximum output and distortion levels for a
200 Ω load. This amplifier can deliver a maximum sine wave
power of 10 dBm to the load.
VPOS
VNEG
100
100
50
GAIN-CONTROL
VOLTAGE
VG
–+
VIN
VOUT
1
2
3
4
5
6
16
15
14
13
12
11
7
8
10
9
REF
A1
A2
AD600 OR
AD602
+
–
C1HI
A1CM
A1OP
A2OP
A2CM
C1LO
A1HI
A1LO
GAT1
A2LO
A2HI
+
C2HI
C2LO
GAT2
+5V
–5V
00
53
8-
0
33
Figure 35. An Ultralow Noise VCA Using the AD600 or AD602
LOW NOISE, 6 dB PREAMPLIFIER
In some ultrasound applications, a high input impedance
preamplifier is needed to avoid the signal attenuation that
results from loading the transducer by the 100 Ω input resistance
of the X-AMP. High gain cannot be tolerated because the
peak transducer signal is typically ±0.5 V, whereas the peak
input capability of the AD600 or AD602 is only slightly more
than ±1 V. A gain of 2 is a suitable choice. It can be shown that,
if the preamplifier’s overall referred-to-input (RTI) noise is the
same as that due to the X-AMP alone (1.4 nV/√Hz), the input
noise of nX2 preamplifier must be √(3/4) times as large, that is,
1.2 nV/√Hz.
+5V
–5V
+5V
–5V
1F
0.1F
VIN
INPUT
GROUND
OUTPUT
GROUND
R1
49.9
R2
174
R5
42.2
R3
562
R7
174
R8
49.9
Q1
MRF904
Q2
MM4049
100
RIN OF X-AMP
R6
562
1F
R4
42.2
1F
00
53
8-
0
34
Figure 36. A Low Noise Preamplifier for the AD600/AD602
An inexpensive circuit using complementary transistor types
chosen for their low rbb is shown in Figure 36. The gain is
determined by the ratio of the net collector load resistance to
the net emitter resistance. It is an open-loop amplifier. The gain
is ×2 (6 dB) only into a 100 Ω load, assumed to be provided by
the input resistance of the X-AMP; R2 and R7 are in shunt with
this load, and their value is important in defining the gain. For
small-signal inputs, both transistors contribute an equal trans-
conductance that is rendered less sensitive to signal level by the
emitter resistors, R4 and R5. They also play a dominant role in
setting the gain.
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