UAF42

更新时间： 2024-01-13 18:45:54

品牌	Logo	应用领域
BB		有源滤波器 LTE
页数	文件大小	规格书
14页	571K
描述
FILTER DESIGN PROGRAM FOR THE UAF42 UNIVERSAL ACTIVE FILTER

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UAF42 技术参数

生命周期：	Transferred	Reach Compliance Code：	unknown
风险等级：	5.67	Is Samacsys：	N
有源滤波器类型：	CONTINUOUS TIME FILTER	中心频率或截止频率最大范围：	100 kHz
中心频率或截止频率最小范围：		JESD-30 代码：	R-PDSO-G16
负电源电压最大值（Vsup）：	-18 V	负电源电压最小值（Vsup）：	-6 V
标称负供电电压 (Vsup)：	-15 V	功能数量：	1
端子数量：	16	最高工作温度：	85 °C
最低工作温度：	-25 °C	封装主体材料：	PLASTIC/EPOXY
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
极和零点：	2 AND 0	认证状态：	Not Qualified
响应：	UNIVERSAL	最大供电电压 (Vsup)：	18 V
最小供电电压 (Vsup)：	6 V	标称供电电压 (Vsup)：	15 V
表面贴装：	YES	温度等级：	OTHER
端子形式：	GULL WING	端子位置：	DUAL
传递特性：	RESISTOR PROGRAMMABLE	Base Number Matches：	1

UAF42 数据手册

AP P LICATION BULLETIN

Mailing Address: PO Box 11400 • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706

Tel: (602) 746-1111 • Twx: 910-952-111 • Telex: 066-6491 • FAX (602) 889-1510 • Immediate Product Info: (800) 548-6132

FILTER DESIGN PROGRAM FOR

THE UAF42 UNIVERSAL ACTIVE FILTER

By Johnnie Molina and R. Mark Stitt (602) 746-7592

Although active filters are vital in modern electronics, their

eliminates signals above the cutoff frequency (in the stop-

band), and perfectly passes signals below it (in the pass-

band). In real filters, various trade-offs are made in an

attempt to approximate the ideal. Some filter types are

optimized for gain flatness in the pass-band, some trade-off

gain variation or ripple in the pass-band for a steeper rate of

attenuation between the pass-band and stop-band (in the

transition-band), still others trade-off both flatness and rate

of roll-off in favor of pulse-response fidelity. FILTER42

supports the three most commonly used all-pole filter types:

Butterworth, Chebyshev, and Bessel. The less familiar In-

verse Chebyshev is also supported. If a two-pole band-pass

or notch filter is selected, the program defaults to a resonant-

circuit response.

design and verification can be tedious and time consuming.

To aid in the design of active filters, Burr-Brown provides a

series of FilterPro™ computer-aided design programs. Us-

ing the FILTER42 program and the UAF42 it is easy to

design and implement all kinds of active filters. The UAF42

is a monolithic IC which contains the op amps, matched

resistors, and precision capacitors needed for a state-variable

filter pole-pair. A fourth, uncommitted precision op amp is

also included on the die.

Filters implemented with the UAF42 are time-continuous,

free from the switching noise and aliasing problems of

switched-capacitor filters. Other advantages of the state-

variable topology include low sensitivity of filter parameters

to external component values and simultaneous low-pass,

high-pass, and band-pass outputs. Simple two-pole filters

can be made with a UAF42 and two external resistors—see

Figure 1.

Butterworth (maximally flat magnitude). This filter has the

flattest possible pass-band magnitude response. Attenuation

is –3dB at the design cutoff frequency. Attenuation beyond

the cutoff frequency is a moderately steep –20dB/decade/

pole. The pulse response of the Butterworth filter has mod-

erate overshoot and ringing.

The DOS-compatible program guides you through the de-

sign process and automatically calculates component values.

Low-pass, high-pass, band-pass, and band-reject (or notch)

filters can be designed.

Chebyshev (equal ripple magnitude). (Other transliterations

of the Russian Heby]ov are Tschebychev, Tschebyscheff

or Tchevysheff). This filter response has steeper initial rate

of attenuation beyond the cutoff frequency than Butterworth.

Active filters are designed to approximate an ideal filter

response. For example, an ideal low-pass filter completely

R_F1

R_F2

15.8kΩ

R₁

50kΩ

C₁

R₂

50kΩ

C₂

1000pF

A₂

1000pF

A₁

A₃

V_O

R₃

50kΩ

R₄

50kΩ

V_IN

UAF42

NOTE: A UAF42 and two external resistors make a unity-gain, two-pole, 1.25dB ripple

Chebyshev low-pass filter. With the resistor values shown, cutoff frequency is 10kHz.

FIGURE 1. Two-Pole Low-Pass Filter Using UAF42.

AB-035C

Printed in U.S.A. July, 1993

12 3 4 5 6 7...14

中文翻译

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与UAF42相关器件

型号	品牌	获取价格	描述	数据表
UAF42_14	TI	获取价格	UNIVERSAL ACTIVE FILTER
UAF42AD	BB	获取价格	Active Filter, 4 Func, Bandpass/Highpass/Lowpass,
UAF42AG	BB	获取价格	Continuous Time Filter, 1 Func, Resistor Programmable, Universal, CDIP14,
UAF42AP	BB	获取价格	UNIVERSAL ACTIVE FILTER
UAF42AP	TI	获取价格	UNIVERSAL ACTIVE FILTER
UAF42AP-1	TI	获取价格	UNIVERSAL ACTIVE FILTER
UAF42APG4	TI	获取价格	Universal Active Filter 14-PDIP
UAF42AU	BB	获取价格	UNIVERSAL ACTIVE FILTER
UAF42AU	TI	获取价格	UNIVERSAL ACTIVE FILTER
UAF42AU-1	TI	获取价格	Universal Active Filter 16-SOIC

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