http://www.chemdy.com AD835是一款完整的四象限电压输出模拟乘法器，采用先进的介质隔离互补双极性工艺制造。它产生X和Y电压输入的线性乘积，−3 dB输出带宽为250 MHz（小信号上升时间为1 ns）。满量程（−1 V至+1 V）上升至下降时间为2.5 ns（采用150 Ω的标准RL），同样条件下的0.1%建立时间典型值为20 ns。
其差分乘法输入(X, Y)和求和输入(Z)处于高阻态。低阻抗输出电压(W)最高可达±2.5 V，可驱动低至25 Ω的负载。正常工作时采用±5 V电源。
AD835不仅具有出众的速度性能，而且易于使用，功能丰富。例如，除允许在输出端添加信号之外，Z输入端还能使AD835的工作电压放大最高约10倍。因此，该放大器的乘积噪声非常低(50 nV/√Hz)，远胜于早期产品。
AD835采用8引脚PDIP封装(N)和8引脚SOIC封装(R)，额定温度范围为−40°C至+85°C工业温度范围。
应用
高速乘法、除法、平方运算
宽带调制和解调
相位检测和测量
正弦波频率加倍
视频增益控制和键控
电压控制放大器和滤波器
产品聚焦
AD835是首款单芯片250 MHz四象限电压输出乘法器。
AD835适用于各种信号处理应用，只需极少的外部器件。
高输入阻抗(100 kΩ||2 pF)使得信号源负载可忽略不计。
高输出电流能力支持驱动低阻抗负载。
通过精心优化器件并使用特殊的低噪声带隙基准电压源，可实现出色的低噪声电平。
易于使用，性价比高，适合要求使用混合或板级解决方案的应用。
特性
简单：基本函数为W = XY + Z
完整：只需极少的外部器件
直流耦合电压输出简化应用
高速：满量程的0.1%建立时间仅20 ns
高差分输入阻抗X、Y和Z输入
乘法器噪声非常低：50 nV/vHz
AD835: 250 MHz,Voltage Output 4-Quadrant Multiplier
The AD835 is a complete four-quadrant, voltage output analog multiplier, fabricated on an advanced dielectrically isolated complementary bipolar process. It generates the linear product of its X and Y voltage inputs with a −3 dB output bandwidth of 250 MHz (a small signal rise time of 1 ns). Full-scale (−1 V to +1 V) rise to fall times are 2.5 ns (with a standard RL of 150 Ω), and the settling time to 0.1% under the same conditions is typically 20 ns.
Its differential multiplication inputs (X, Y) and its summing input (Z) are at high impedance. The low impedance output voltage (W) can provide up to ±2.5 V and drive loads as low as 25 Ω. Normal operation is from ±5 V supplies.
Though providing state-of-the-art speed, the AD835 is simple to use and versatile. For example, as well as permitting the addition of a signal at the output, the Z input provides the means to operate the AD835 with voltage gains up to about ×10. In this capacity, the very low product noise of this multiplier (50 nV/√Hz) makes it much more useful than earlier products.
The AD835 is available in an 8-lead PDIP package (N) and an 8-lead SOIC package (R) and is specified to operate over the −40°C to +85°C industrial temperature range.
APPLICATIONS
Very fast multiplication, division, squaring
Wideband modulation and demodulation
Phase detection and measurement
Sinusoidal frequency doubling
Video gain control and keying
Voltage-controlled amplifiers and filters
PRODUCT HIGHLIGHTS
The AD835 is the first monolithic 250 MHz, four-quadrant voltage output multiplier.
Minimal external components are required to apply the AD835 to a variety of signal processing applications.
High input impedances (100 kΩ||2 pF) make signal source loading negligible.
High output current capability allows low impedance loads to be driven.
State-of-the-art noise levels achieved through careful device optimization and the use of a special low noise, band gap voltage reference.
Designed to be easy to use and cost effective in applications that require the use of hybrid or board-level solutions.
Features
Simple: Basic Function is W = XY + Z
Complete: Minimal External Components Required
DC-Coupled Voltage Output Simplifies
Use
Very Fast: Settles to 0.1% of FS in 20 ns
High Differential Input Impedance X, Y,
and Z Inputs
Low Multiplier Noise: 50 nV/vHz
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