LTC1563-3IGN

更新时间： 2024-02-27 06:48:44

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
12页	149K
描述
Active RC, 4th Order Lowpass Filter Family

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技术参数
数据手册

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LTC1563-3IGN 技术参数

是否Rohs认证：	符合	生命周期：	Transferred
零件包装代码：	SSOP	包装说明：	SSOP, SSOP16,.25
针数：	16	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.29	有源滤波器类型：	CONTINUOUS TIME FILTER
中心频率或截止频率最大范围：	256 kHz	中心频率或截止频率最小范围：	0.256 kHz
JESD-30 代码：	R-PDSO-G16	JESD-609代码：	e3
长度：	4.9 mm	湿度敏感等级：	1
功能数量：	1	端子数量：	16
最高工作温度：	85 °C	最低工作温度：	-40 °C
阶次：	4TH	封装主体材料：	PLASTIC/EPOXY
封装代码：	SSOP	封装等效代码：	SSOP16,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, SHRINK PITCH
峰值回流温度（摄氏度）：	250	极和零点：	4 AND 0
电源：	+-5/2.7/11 V	认证状态：	Not Qualified
响应：	LOWPASS	座面最大高度：	1.75 mm
子类别：	Active Filters	最大供电电流 (Isup)：	23 mA
最大供电电压 (Vsup)：	11 V	最小供电电压 (Vsup)：	2.7 V
标称供电电压 (Vsup)：	4.75 V	表面贴装：	YES
技术：	CMOS	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	0.635 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	传递特性：	BESSEL
宽度：	3.899 mm	Base Number Matches：	1

LTC1563-3IGN 数据手册

LTC1563-2/ LTC1563-3

W U U

APPLICATIONS INFORMATION

Functional Description

in parallel, yields a net effective resistance of 952k and an

error of –5%. Note that the gain is also limited to unity at

the minimum f_C.

The LTC1563-2/LTC1563-3 are a family of easy-to-use,

4th order lowpass filters with rail-to-rail operation. The

LTC1563-2, with a single resistor value, gives a unity-gain

filter approximating a Butterworth response. The

LTC1563-3, with a single resistor value, gives a unity-gain

filter approximating a Bessel (linear phase) response. The

proprietary architecture of these parts allows for a simple

unity-gain resistor calculation:

At intermediate f_C, the gain is limited by one of the two

reasons discussed above. For best results, design filters

with gain using FilterCAD Version 3 (or newer) or contact

the Linear Technology Filter Applications Group for assis-

tance.

DC Offset, Noise and Gain Considerations

R = 10k(256kHz/f_C)

The LTC1563-X is DC offset trimmed in a 2-step manner.

First, section A is trimmed for minimum DC offset. Next,

section B is trimmed to minimize the total DC offset

(section A plus section B). This method is used to give the

minimum DC offset in unity gain applications and most

higher gain applications.

where f_Cis the desired cutoff frequency. For many appli-

cations, this formula is all that is needed to design a filter.

For example, a 50kHz filter requires a 51.2k resistor. In

practice, a 51.1k resistor would be used as this is the

closest E96, 1% value available.

The LTC1563-X is constructed with two 2nd order sec-

tions. The output of the first section (section A) is simply

fed into the second section (section B). Note that section

A and section B are similar, but not identical. The parts are

designed to be simple and easy to use.

Forgains greaterthanunity, thegainshouldbedistributed

such that most of the gain is taken in section A, with

section B at a lower gain (preferably unity). This type of

gain distribution results in the lowest noise and lowest DC

offset. For high gain, low frequency applications, all of the

gain is taken in section A, with section B set for unity-gain.

In this configuration, the noise and DC offset is dominated

by those of section A. At higher frequencies, the op amps’

finite bandwidth limits the amount of gain that section A

can reliably achieve. The gain is more evenly distributed in

this case. The noise and DC offset of section A is now

multiplied by the gain of section B. The result is slightly

higher noise and offset.

By simply utilizing different valued resistors, gain and

other transfer functions are achieved. For these applica-

tions,theresistorvaluecalculationgets moredifficult.The

tables of formulas provided later in this section make this

task much easier. For best results, design these filters

using FilterCAD Version 3.0 (or newer) or contact the

Linear Technology Filter Applications group for assis-

tance.

Cutoff Frequency (f_C) and Gain limitations

Output Loading: Resistive and Capacitive

The LTC563-X has both a maximum f_Climit and a mini-

mumf_Climit.Themaximumf_Climit(256kHzinHighSpeed

mode and 25.6kHz in the Low Power mode) is set by the

speed of the LTC1563-X’s op amps. At the maximum f_C,

the gain is also limited to unity.

The op amps of the LTC1563-X have a rail-to-rail output

stage. To obtain maximum performance, the output load-

ing effects must be considered. Output loading issues can

be divided into resistive effects and capacitive effects.

Resistiveloadingaffects themaximumoutputsignalswing

and signal distortion. If the output load is excessive, the

output swing is reduced and distortion is increased. All of

theoutputvoltageswingtestingontheLTC1563-Xis done

withR22=100kanda10kloadresistor.Forbestundistorted

outputswing, theoutputloadresistanceshouldbegreater

than 10k.

A minimum f_Cis dictated by the practical limitation of

reliably obtaining large valued, precision resistors. As the

desiredf_Cdecreases,theresistorvaluerequiredincreases.

When f_Cis 2.56kHz, the resistors are 1M. Obtaining a

reliable, precise 1M resistance between two points on a

printed circuit board is somewhat difficult. For example, a

1M resistor with 20MΩ of stray, layout related resistance

FilterCAD is trademark of Linear Technology Corporation.

1...4 5 678 9 10...12

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型号	品牌	描述	获取价格	数据表
LTC1563-3IGN#TRPBF	Linear	LTC1563 - Active RC, 4th Order Lowpass Filter Family; Package: SSOP; Pins: 16; Temperature	获取价格
LTC1563C	Linear	Active RC, 4th Order Lowpass Filter Family	获取价格
LTC1563I	Linear	Active RC, 4th Order Lowpass Filter Family	获取价格
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LTC1564CG	Linear	10kHz to 150kHz Digitally Controlled Antialiasing Filter and 4-Bit P.G.A	获取价格

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