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FEATURES

s

LT1568

Very Low Noise,

High Frequency Active RC,

Filter Building Block

DESCRIPTIO

The LT

廬

1568 is an easy-to-use, active-RC filter building

block with rail-to-rail inputs and outputs. The internal ca-

pacitors of the IC and the GBW product of the internal low

noise op amps are trimmed such that consistent and repeat-

able filter responses can be achieved. With a single resis-

tor value, the LT1568 provides a pair of

matched

2-pole

Butterworth lowpass filters with unity gain suitable for I/Q

channels.

By using unequal-valued external resistors, the two 2-pole

sections can create different frequency responses or

gains. In addition, the two stages may be cascaded to

create a single 4-pole filter with a programmable re-

sponse. Capable of cutoff frequencies up to 10MHz, the

LT1568 is ideal for antialiasing or channel filtering in high

speed data communications systems. The LT1568 can

also be used as a bandpass filter.

The LT1568 features very low noise, supporting signal-to-

noise ratios of over 90dB. It also provides single-ended to

differential signal conversion for directly driving high

speed A/D converters. The LT1568 has a shutdown mode

that reduces supply current to approximately 0.5mA on a

5V supply.

The LT1568 is available in a narrow 16-lead SSOP

package.

, LTC and LT are registered trademarks of Linear Technology Corporation.

s

Up to 10MHz Center Frequency on a Single 3V

Supply

Easy to Use鈥擜 Single Resistor Value Sets Lowpass

Cutoff Frequency (200kHz

鈮?茠

C

鈮?/div>

5MHz), Unequal

Resistor Values Extend Cutoff Frequency Up to

10MHz

Extremely Flexible鈥擠ifferent Resistor Values

Allow Lowpass Transfer Functions with or Without

Gain (Butterworth, Chebyshev or Custom)

SNR = 92dB (茠

C

= 2MHz, 2V

P-P

)

THD = 鈥?4dB (茠

C

= 2MHz, 1V

P-P

)

Internal Capacitors Trimmed to

鹵0.75%

Single 4-Pole Lowpass Filter or

Matched Pair

of

2-Pole Lowpass Filters

Can be Connected as a Bandpass Filter

Single-Ended or Differential Output

Operates from Single 3V (2.7V Min) to

鹵5V

Supply

Rail-to-Rail Input and Output Voltages

APPLICATIO S

s

Replaces Discrete RC Active Filters and LC Filter

Modules

Antialiasing/Reconstruction Filters

Dual or I-and-Q Channels (Two Matched 2nd Order

Filters in One Package)

Single-Ended to Differential Conversion

Video Signal Processing

TYPICAL APPLICATIO

3V

0.1碌F

1

511鈩?/div>

V

INA

V

OUTA

V

OUTA

511鈩?/div>

2

3

4

5

6

0.1碌F 7

8

Amplitude and Phase Matched Dual Butterworth 2.5MHz Lowpass

Filter with Differential Output. Single 3V Supply Operation

16

V

+

LT1568

15

INVA

INVB

14

SA

SB

13

OUTA

OUTB

12

OUTA

OUTB

11

GNDA GNDB

10

NC

EN

9

V

鈥?/div>

V

鈥?/div>

V

+

Amplitude Response

3

0

鈥?

511鈩?/div>

GAIN (dB)

鈥?

V

INB

V

OUTB

511鈩?/div>

V

OUTB

THE PROPRIETARY ARCHITECTURE

ALLOWS FOR A SIMPLE RESISTOR

CALCULATION:

10MHz

R = 128鈩?鈥?/div>

;

茠

C

= CUTOFF FREQUENCY

茠

C

鈥?

鈥?2

鈥?5

鈥?8

鈥?1

鈥?4

鈥?7

100k

1M

FREQUENCY (Hz)

10M

1568 TA02

1568 TA01

U

1568f

1

數(shù)據(jù)列表
LT1568
標(biāo)準(zhǔn)包裝
100
類別
集成電路 (IC)
家庭
接口 - 濾波器 - 有源
系列
-
濾波器類型
帶通
頻率 - 截止或中心
200kHz
濾波器數(shù)
2
濾波器階數(shù)
2nd
電源電壓
2.7 V ~ 11 V，±2.7 V ~ 5.5 V
安裝類型
表面貼裝
封裝/外殼
16-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝
16-SSOP
包裝
管件

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LT1568IGN Datasheet

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LT1568IGN 產(chǎn)品屬性

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