参数资料
| 型号： | AD835AR |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC MULTIPLIER 4-QUADRANT 8-SOIC |
| 标准包装： | 1 |
| 功能： | 模拟乘法器 |
| 位元/级数： | 四象限 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 管件 |
AD835
Rev. D | Page 11 of 16
APPLICATIONS INFORMATION
The AD835 is easy to use and versatile. The capability for adding
another signal to the output at the Z input is frequently valuable.
Three applications of this feature are presented here: a wideband
voltage-controlled amplifier, an amplitude modulator, and a
frequency doubler. Of course, the AD835 may also be used as a
square law detector (with its X inputs and Y inputs connected in
parallel). In this mode, it is useful at input frequencies to well
over 250 MHz because that is the bandwidth limitation of the
output amplifier only.
MULTIPLIER CONNECTIONS
Figure 20 shows the basic connections for multiplication. The
inputs are often single sided, in which case the X2 and Y2 inputs
are normally grounded. Note that by assigning Pin 7 (X2) and
Pin 2 (Y2), respectively, to these (inverting) inputs, an extra
measure of isolation between inputs and output is provided.
The X and Y inputs may be reversed to achieve some desired
overall sign with inputs of a particular polarity, or they may be
driven fully differentially.
Power supply decoupling and careful board layout are always
important in applying wideband circuits. The decoupling
recommendations shown in Figure 20 should be followed
supply decoupling components are omitted for clarity but should
be used wherever optimal performance with high speed inputs
is required. However, if the full, high frequency capabilities of the
AD835 are not being exploited, these components can be
omitted.
WIDEBAND VOLTAGE-CONTROLLED AMPLIFIER
Figure 21 shows the AD835 configured to provide a gain of
nominally 0 dB to 12 dB. (In fact, the control range extends from
well under –12 dB to about +14 dB.) R1 and R2 set the gain to
be nominally ×4. The attendant bandwidth reduction that comes
with this increased gain can be partially offset by the addition of
the peaking capacitor C1. Although this circuit shows the use of
dual supplies, the AD835 can operate from a single 9 V supply
with a slight revision.
00883-
021
R1
97.6
Ω
C1
33pF
R2
301
Ω
AD835
1
2
3
4
8
VOLTAGE
OUTPUT
VG
(GAIN CONTROL)
VIN
(SIGNAL)
X2
VP
W
Y1
X1
Y2
+5V
–5V
VN
Z
7
6
5
Figure 21. Voltage-Controlled 50 MHz Amplifier Using the AD835
The ac response of this amplifier for gains of 0 dB (VG = 0.25 V),
In this application, the resistor values have been slightly adjusted to
reflect the nominal value of U = 1.05 V. The overall sign of the
gain may be controlled by the sign of VG.
00
88
3-
02
2
10k
100k
1M
FREQUENCY (Hz)
–9
–6
–3
0
3
6
9
12
15
18
21
GA
IN
(
d
B
)
10M
100M
12dB
(VG = 1V)
6dB
(VG = 0.5V)
0dB
(VG = 0.25V)
Figure 22. AC Response of VCA
AMPLITUDE MODULATOR
Figure 23 shows a simple modulator. The carrier is applied to the
Y input and the Z input, while the modulating signal is applied to
the X input. For zero modulation, there is no product term so the
carrier input is simply replicated at unity gain by the voltage
follower action from the Z input. At X = 1 V, the RF output is
doubled, while for X = –1 V, it is fully suppressed. That is, an
X input of approximately ±1 V (actually ±U or about 1.05 V)
corresponds to a modulation index of 100%. Carrier and
modulation frequencies can be up to 300 MHz, somewhat
beyond the nominal 3 dB bandwidth.
Of course, a suppressed carrier modulator can be implemented
by omitting the feedforward to the Z input, grounding that
pin instead.
0
088
3-
0
26
+5V
–5V
AD835
1
2
3
4
8
X2
MODULATION
SOURCE
MODULATED
CARRIER
OUTPUT
CARRIER
SOURCE
VP
W
Y1
X1
Y2
VN
Z
7
6
5
Figure 23. Simple Amplitude Modulator Using the AD835
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD835AR-ND | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD835AR-REEL | 功能描述:IC MULTIPLIER 4-QUADRANT 8-SOIC RoHS:否 类别:集成电路 (IC) >> 线性 - 模拟乘法器，除法器 系列:- 标准包装:25 系列:HA 功能:模拟乘法器 位元/级数:四象限 封装/外壳:16-CDIP（0.300"，7.62mm） 供应商设备封装:16-CDIP 侧面铜焊 包装:管件 |
| AD835AR-REEL7 | 功能描述:IC MULTIPLIER 4-QUADRANT 8-SOIC RoHS:否 类别:集成电路 (IC) >> 线性 - 模拟乘法器，除法器 系列:- 标准包装:25 系列:HA 功能:模拟乘法器 位元/级数:四象限 封装/外壳:16-CDIP（0.300"，7.62mm） 供应商设备封装:16-CDIP 侧面铜焊 包装:管件 |
| AD835ARZ | 功能描述:IC MULTIPLIER 4-QUADRANT 8-SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 模拟乘法器，除法器 系列:- 标准包装:25 系列:HA 功能:模拟乘法器 位元/级数:四象限 封装/外壳:16-CDIP（0.300"，7.62mm） 供应商设备封装:16-CDIP 侧面铜焊 包装:管件 |
| AD835ARZ | 制造商:Analog Devices 功能描述:Analog Multiplier IC 制造商:Analog Devices 功能描述:IC, ANALOG MULTIPLIER, 1000V/ uS, 8-SOIC |
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