Datasheet > 过滤器 > 有源滤波器> LTC1562IG-2#PBF

LTC1562IG-2#PBF

更新时间： 2024-01-14 15:08:39

品牌	Logo	应用领域
凌特 - Linear		有源滤波器过滤器光电二极管 LTE
页数	文件大小	规格书
16页	182K
描述
LTC1562-2 - Very Low Noise, Low Distortion Active RC Quad Universal Filter; Package: SSOP; Pins: 20; Temperature Range: -40°C to 85°C

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LTC1562IG-2#PBF 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,
针数：	20	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.06	有源滤波器类型：	CONTINUOUS TIME FILTER
中心频率或截止频率最大范围：	300 kHz	中心频率或截止频率最小范围：	20 kHz
JESD-30 代码：	R-PDSO-G20	JESD-609代码：	e3
长度：	7.2 mm	湿度敏感等级：	1
负电源电压最大值（Vsup）：	-5.25 V	负电源电压最小值（Vsup）：	-2.375 V
标称负供电电压 (Vsup)：	-5 V	功能数量：	4
端子数量：	20	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SSOP	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：	2 AND 0	认证状态：	Not Qualified
响应：	UNIVERSAL	座面最大高度：	2 mm
最大供电电压 (Vsup)：	5.25 V	最小供电电压 (Vsup)：	2.375 V
标称供电电压 (Vsup)：	5 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：	0.65 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：	RESISTOR PROGRAMMABLE
宽度：	5.3 mm	Base Number Matches：	1

LTC1562IG-2#PBF 数据手册

LTC1562-2

W U U

APPLICATIONS INFORMATION

The LTC1562-2 contains four matched, 2nd order,

3-terminal universal continuous-time filter blocks, each

with a virtual-ground input node (INV) and two rail-to-rail

outputs (V1, V2). In the most basic application, one such

block and three external resistors provide 2nd order

lowpassandbandpassresponsessimultaneously(Figure

3, with a resistor for Z_IN). The three external resistors

program f_O, Q and gain. A combination of internal preci-

sion components and external resistor R2 sets the center

frequency f_Oof each 2nd order block. The LTC1562-2 is

trimmed at manufacture so that f_Owill be 200kHz ±0.5%

iftheexternalresistorR2isexactly7958Ω.TheLTC1562-

2 is a higher frequency, pin compatible variant of the

LTC1562,withdifferentinternalRandCvaluesandhigher

speed amplifiers.

Setting f_Oand Q

Each of the four 2nd order sections in the LTC1562-2 can

be programmed for a standard filter function (lowpass,

bandpass or highpass) when configured as in Figure 3

with a resistor or capacitor for Z_IN. These transfer func-

tions all have the same denominator, a complex pole pair

with center frequency ω_O= 2πf_Oand quality parameter Q.

(The numerators depend on the response type as de-

scribed below.) External resistors R2 and R_Qset f_Oand Q

as follows:

7958Ω

f_O=

Q =

200kHz

(

)

2πC (R1)R2

R_Q

7958Ω R2

R_Q200kHz

However, lowpass/bandpass filtering is only one specific

application for the 2nd order building blocks in the

LTC1562-2. Highpass response results if the external

impedanceZ_INinFigure3becomesacapacitorC_IN(whose

value sets only gain, not critical frequencies) as described

below. Responses with zeroes (e.g, elliptic or notch

responses) are available by feedforward connections with

multiple2ndorderblocks(seeTypicalApplicatons).More-

over, the virtual-ground input gives each 2nd order sec-

tion the built-in capability for analog operations such as

gain (preamplification), summing and weighting of mul-

tiple inputs, or accepting current or charge signals di-

rectly. These Operational Filter^TMfrequency-selective

building blocks are nearly as versatile as operational

amplifiers.

f_O

(R1)R2

(

)

R1 = 7958Ω and C = 100pF are internal to the LTC1562-2

while R2 and R_Qare external.

A typical design procedure proceeds from the desired f_O

and Q as follows, using finite-tolerance fixed resistors.

First find the ideal R2 value for the desired f_O:

200kHz

R2 Ideal =

7958Ω

(

)

(

)

f_O

Then select a practical R2 value from the available finite-

tolerance resistors. Use the actual R2 value to find the

desired R_Q, which also will be approximated with finite

tolerance:

The user who is not copying exactly one of the Typical

Applications schematics shown later in this data sheet is

urged to read carefully the next few sections through at

least Signal Swings, for orientation about the LTC1562-2,

before attempting to design custom application circuits.

Also available free from LTC, and recommended for de-

signing custom filters, is the general-purpose analog filter

design software FilterCAD^TMfor Windows^®. This software

includes tools for finding the necessary f₀, Q and gain

parameters to meet target filter specifications such as

frequency response.

R_Q= Q (7958Ω)R2

The f_Orange is approximately 20kHz to 300kHz, limited

mainly by the magnitudes of the external resistors

required. As shown above, R2 varies with the inverse

square of f_O. This relationship desensitizes f_Oto R2’s

tolerance (by a factor of 2 incrementally), but it also

implies that R2 has a wider range than f_O. (R_Qand R_INalso

Operational Filter and FilterCAD are trademarks of Linear Technology Corporation.

Windows is a registered trademark of Microsoft Corporation.

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LTC1562IG-2#TR	Linear	LTC1562-2 - Very Low Noise, Low Distortion Active RC Quad Universal Filter; Package: SSOP;	获取价格
LTC1562IG-2#TRPBF	Linear	LTC1562-2 - Very Low Noise, Low Distortion Active RC Quad Universal Filter; Package: SSOP;	获取价格
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