LTC1064-2CSW#TR_技术文档

LTC1064

Low Noise, Fast, Quad

Universal Filter Building Block

U

FEATURES

DESCRIPTIO

■

Four Filters in a 0.3 Inch Wide Package

The LTC^®1064 consists of four high speed, low noise

switched-capacitor filter building blocks. Each filter build-

ing block, together with an external clock and three to five

resistors can provide various 2nd order functions like

lowpass, highpass, bandpass and notch. The center fre-

quency of each 2nd order function can be tuned with an

external clock, or a clock and resistor ratio. For Q ≤ 5, the

center frequency range is from 0.1Hz to 100kHz. For Q ≤

3, the center frequency range can be extended to 140kHz.

Up to 8th order filters can be realized by cascading all four

2nd order sections. Any classical filter realization (such as

Butterworth,Cauer,BesselandChebyshev)canbeformed.

■

Maximum Center Frequency: 140kHz

■

Customized Version with Internal Resistors

Available

■

One Half the Noise of the LTC1059/LTC1060/

LTC1061 Devices

Maximum Clock Frequency: 7MHz

■

Clock-to-Center Frequency Ratio of 50:1 and 100:1

Simultaneously Available

■

Power Supplies: ±2.375V to ±8V

■

Low Offsets

■

Low Harmonic Distortion

■

Available in 24-Pin DIP and SO Wide Packages

A customized monolithic version of the LTC1064 includ-

ing internal thin film resistors can be obtained for high

volume applications. Consult LTC Marketing for details.

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

LTCMOS is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

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APPLICATIO S

■

Anti-Aliasing Filters

Wide Frequency Range Tracking Filters

Spectral Analysis

Loop Filters

■

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TYPICAL APPLICATIO

Clock-Tunable 8th Order Cauer Lowpass Filter with f

up to 100kHz

CUTOFF

13k

66.5k

R

H2

102k

PIN 12

Gain vs Frequency

22.1k

1

2

24

23

22

21

20

19

18

17

16

15

14

13

V

INV B

HPB/NB

BPB

INV C

HPC/NC

BPC

IN

10k

0

–15

18.25k

10.7k

12.1k

17.4k

3

R

4

L2

LPB

LPC

–30

26.7k

5

SB

SC

–45

f

= 5MHz

CLK

RIPPLE = ±0.1dB

6

–

–60

AGND

V

–8V

0.1µF

LTC1064

7

+

–75

8V

V

CLK

50/100

LPD

5MHz

8V

f

= 1MHz

0.1µF

10k

CLK

8

–90

RIPPLE = ±0.05dB

SA

V

OUT

9

–105

–120

–135

LPA

41.2k

12.7k

14k

49.9K

11.5K

10

11

12

BPA

BPD

HPA/NA

INV A

HPD

1k

10k

100k

1M

(FROM

H2 L2

INPUT FREQUENCY (Hz)

INV D

R

, R )

121k

10k

1064 TA02

FOR f

CLK

= 5MHz, ADD C1 = 10pF BETWEEN PINS 4, 1

C2 = 10pF BETWEEN PINS 21, 24

WIDEBAND NOISE ≅ 140µV

RMS

1064 TA01

C3 = 27pF BETWEEN PINS 9, 12

1064fb

1

LTC1064

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ABSOLUTE AXI U RATI GS ^{(Note 1)}

Total Supply Voltage (V⁺to V^–) ............................. 16V

Power Dissipation............................................. 500mW

Operating Temperature Range

Storage Temperature Range ................ –65°C to 150°C

Lead Temperature (Soldering, 10 sec)................. 300°C

LTC1064AC/LTC1064C.................... –40°C to 85°C

LTC1064AM

LTC1064M (OBSOLETE) ............... –55°C to 125°C

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PACKAGE/ORDER I FOR ATIO

TOP VIEW

ORDER PART

NUMBER

ORDER PART

NUMBER

INV B

HPB/NB

BPB

INV B

HPB/NB

BPB

1

2

24

23

22

21

20

19

18

17

16

15

14

13

INV C

HPC/NC

BPC

1

2

INV C

HPC/NC

BPC

24

23

22

21

20

19

18

17

16

15

14

13

LTC1064ACN

LTC1064CN

3

LTC1064CSW

3

LPB

4

LPC

4

LPC

SB

5

SC

5

SC

–

AGND

6

V

6

V

+

V

7

CLK

7

CLK

SA

LPA

SA

LPA

8

50/100

LPD

8

50/100

LPD

9

BPA

10

11

12

BPD

10

11

12

BPD

HPA/NA

INV A

HPA/NA

INV A

HPD

INV D

SW PACKAGE

24-LEAD PLASTIC SO WIDE

N PACKAGE

24-LEAD PLASTIC DIP

T_JMAX= 100°C, θ_JA= 85°C/ W

T_JMAX= 110°C, θ_JA= 65°C/W

LTC1064ACJ

LTC1064CJ

LTC1064AMJ

LTC1064MJ

J PACKAGE 24-LEAD CERAMIC DIP

T_JMAX= 150°C, θ_JA= 100°C/W

OBSOLETE PACKAGE

Consider the 24-Lead N Package as an Alternate Source

Order Options Tape and Reel: Add #TR

Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF

Lead Free Part Marking: http://www.linear.com/leadfree/

Consult LTC Marketing for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS

(Internal Op Amps) The

●

denotes the specifications which apply over the

full operating temperature range, otherwise specifications are at T = 25°C.

A

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Operating Supply Voltage Range

Voltage Swings

± 2.375

±3.2

±3.1

±8

V

V = ±5V, R = 5k

±3.6

S

L

●

Output Short-Circuit Current (Source/Sink)

DC Open-Loop Gain

GBW Product

V = ±5V

3

80

7

mA

dB

MHz

S

V = ±5V, R = 5k

S

L

V = ±5V

S

Slew Rate

V = ±5V

S

10

V/µs

1064fb

2

LTC1064

ELECTRICAL CHARACTERISTICS

(Complete Filter) The

●

denotes the specifications which apply over the full

operating temperature range, otherwise specifications are at V = ±5V, T = 25°C, TTL clock input level, unless otherwise specified.

S

A

PARAMETER

CONDITIONS

V = ±8V, Q ≤ 3

MIN

TYP

0.1 to 140

0 to 1

MAX

UNITS

kHz

MHz

Center Frequency Range, f

Input Frequency Range

O

S

Clock-to-Center Frequency

Ratio, f /f

LTC1064

LTC1064A (Note 2)

f

= 1MHz, f = 20kHz, Pin 17 High

50 ± 0.3

%

CLK

O

Sides A, B, C: Mode 1,

R1 = R3 = 5k, R2 = 5k, Q = 10,

Sides D: Mode 3, R1 = R3 = 50k

R2 = R4 = 5k

●

50 ± 0.8

50 ± 0.9

CLK

O

%

LTC1064

LTC1064A (Note 2)

Same as Above, Pin 17 Low, f

= 1MHz

100 ± 0.3

%

CLK

f = 10kHz

O

Sides A, B, C

Side D

●

100 ± 0.8

100 ± 0.9

Clock-to-Center Frequency

Ratio, Side-to-Side Matching LTC1064A (Note 2)

LTC1064

f

= 1MHz

0.4

%

CLK

●

1

Clock-to-Center Frequency

LTC1064

LTC1064A (Note 2)

f

= 4MHz, f = 80kHz, Pin 17 High

50 ± 0.6

%

CLK

O

Ratio, f /f (Note 3)

Sides A, B, C: Mode 1, V = ±7.5V

50 ± 1.3

CLK

O

S

R1 = R3 = 50k, R2 = 5k, Q = 5

Side D: Mode 3, R1 = R3 = 50k

R2 = R4 = 5k, f

= 4MHz

CLK

LTC1064

LTC1064 A (Note 2)

Same as Above, Pin 17 Low

= 4MHz, f = 40kHz

100 ± 0.6

%

f

100 ± 1.3

CLK

O

Q Accuracy

Sides A, B, C: Mode 1, Q = 10

Side D: Mode 3, f = 1MHz

●

±2

±3

6

8

%

CLK

f Temperature Coefficient

O

Mode 1, 50:1, f

< 2MHz

±1

ppm/°C

CLK

Q Temperature Coefficient

Mode 1, 100:1, f

< 2MHz

±5

ppm/°C

CLK

Mode 3, f

< 2MHz

CLK

DC Offset Voltage

V

(Table 1)

f

= 1MHz, 50:1 or 100:1

< 1MHz

●

2

3

0.2

7

12

15

45

mV

OS1

OS2

OS3

CLK

Clock Feedthrough

Maximum Clock Frequency

Power Supply Current

mV

RMS

MHz

Mode 1, Q < 5, V ≥ ±5V

S

9

23

26

mA

●

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: Contact LTC Marketing.

Note 3: Not tested, guaranteed by design.

Table 1. Output DC Offsets, One 2nd Order Section

V

OSLP

PINS 4, 9, 16, 21

OSN

OSBP

MODE

PINS 2, 11, 14, 23

PINS 3, 10, 15, 22

1

1b

2

V

[(1/Q) + 1 + ⏐⏐ ⏐⏐ ] – V /Q

H

V

OSN

– V

OS1

OLP

OS3

OS2

[(1/Q) + 1 + (R2/R1)] – V /Q

~(V

– V )[1 + (R5/R6)]

OSN OS2

OS3

[(1 + (R2/R1) + (R2/R3) + (R2/R4) – V (R2/R3)]

V

– V

OSN OS2

OS3

× [R4/(R2 + R4)] + V [R2/(R2 + R4)]

OS2

3

V

[1 + (R4/R1) + (R4/R2) + (R4/R3)]

OS1

OS2

OS3

– V (R4/R2) – V (R4/R3)

OS2

OS3

1064fb

3

LTC1064

W

BLOCK DIAGRA

HPA/NA

(11)

BPA

(10)

LPA

(9)

+

V

(7)

INV A

(12)

–

50/100 (17)

+

Σ

∫

AGND

(6)

+

–

CLK (18)

–

BPB

(3)

LPB

(4)

HPB/NB

(2)

V

(19)

SA

(8)

INV B

(1)

–

Σ

–

+

HPC/NC

(23)

LPC

(21)

BPC

(22)

SB

(5)

+

INV C

(24)

BY TYING PIN 17 TO V , ALL SECTIONS

OPERATE WITH (f /f ) = 50:1

–

+

CLK

O

–

Σ

–

BY TYING PIN 17 TO V , ALL SECTIONS

OPERATE WITH (f /f ) = 100:1

CLK

O

BY TYING PIN 17 TO AGND, SECTIONS B, C

LPD

(16)

HPD

(14)

BPD

(15)

OPERATE WITH (f /f ) = 50:1 AND

CLK

O

SECTIONS A, D OPERATE AT 100:1

SC

(20)

INV D

(13)

–

+

1064 BD

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TYPICAL PERFORMANCE CHARACTERISTICS

Mode 1, (f /f ) = 50:1

Mode 1, (f /f ) = 100:1

Mode 2, (f /f ) = 25:1

CLK O

CLK

O

CLK

O

T

= 25°C

T

= 25°C

T

= 25°C

Q = 5

A

Q = 5

Q = 10

+

20

15

10

5

20

15

10

5

20

15

10

5

Q = 10

PIN 17 AT V

(R2/R4) = 3

Q = 10

V

S

= ±5V

V

= ±5V

S

V

S

= ±7.5V

V = ±2.5V

S

C

V

= ±2.5V

S

C

= 15pF

V

C

= ±5V

= 15pF

V

= ±7.5V

S

C

S

0

V

S

= ±2.5V

–5

T

= 25°C

T

= 25°C

A

V

= ±7.5V

S

Q = 5 OR 10

V

= ±5V

S

1.5

1.0

0.5

0

1.5

1.0

0.5

0

1.5

1.0

0.5

0

V

= ±5V

S

V

S

= ±2.5V

V

= ±2.5V

S

V

S

= ±7.5V

V

= ±5V

V

= ±2.5V

S

0

10

40

60 70 80 90 100110 120

0

10

40

60 70 80 90 100110 120

50

20 30

50

20 30

0

10

40

60 70 80 90 100110 120

50

20 30

CENTER FREQUENCY (kHz)

1064 G02

1064 G03

1064 G01

1064fb

4

LTC1064

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TYPICAL PERFORMANCE CHARACTERISTICS

Mode 2, (f /f ) = 25:1

Mode 3, (f /f ) = 50:1

CLK O

Mode 2, (f /f ) = 50:1

CLK

O

CLK

O

T

= 25°C

T

= 25°C

A

S

A

–

V

= ±7.5V

PIN 17 AT V

(R2/R4) = 3

Q = 5

T

= 25°C

A

C

20

15

10

5

+

20

15

10

5

V

= ±5V

PIN 17 AT V

(R2/R4) = 3

S

V

S

= ±2.5V

C

= 5pF

20

15

10

5

R2 = R4

V

= ±5V

S

Q = 10

Q = 5

Q = 10

Q = 5

= 22pF

Q = 2

= 39pF

V = ±2.5V

S

V

= ± 7.5V

S

C

0

V

S

= ± 7.5V

–5

0

–5

1.5

1.0

0.5

0

1.5

1.0

0.5

0

V

= ±5V

S

Q = 2

Q = 5

1.5

1.0

0.5

0

V

= ±2.5V

S

V

= ±5V

S

V

S

= ± 7.5V

V

S

= ± 7.5V

V

S

= ±2.5V

0

20

80

120140160180200

100

CENTER FREQUENCY (kHz)

40 60

0

10

40

60 70 80 90 100110 120

50

CENTER FREQUENCY (kHz)

20 30

0

10

40

60 70 80 90 100110 120

50

20 30

1064 G04

1064 G05

CENTER FREQUENCY (kHz)

1064 G06

Mode 3, (f /f ) = 50:1

Mode 3, (f /f ) = 100:1

Wideband Noise vs Q

CLK

O

CLK

O

240

220

200

180

160

140

120

100

80

T

= 25°C

T

= 25°C

ANY OUTPUT

R3 = R1

ONE SECOND ORDER

SECTION

MODE 1 OR 3

100:1 OR 50:1

A

C

A

C

= 15pF

C

= 5pF

20

15

10

5

20

15

10

5

R2 = R4

V

R2 = R4

Q = 10

V

= ±2.5V

S

= ±7.5V

V

S

= ±5V

S

Q = 2

Q = 1

±7.5V

±5V

±2.5V

V

S

= ± 7.5V

0

–5

V

S

= ±5V

V

= ±2.5V

S

V

= ±7.5V

S

1.5

1.0

0.5

0

1.5

1.0

0.5

0

60

V

= ±2.5V

S

V = ± 7.5V

S

V

= ±5V

40

S

20

0

10

40

60 70 80 90 100110 120

50

20 30

0

10

40

60 70 80 90 100110 120

50

20 30

0

2

8 12 14 16 18 20 22 24

10

4

6

CENTER FREQUENCY (kHz)

Q

1064 G07

1064 G08

1064 G09

Harmonic Distortion, 8th Order

LP Butterworth, f = 20kHz,

Power Supply Current vs

Supply Voltage

C

THD = 0.015% for 3V

Input

RMS

48

44

40

36

32

28

24

20

16

12

8

–55°C

25°C

125°C

4

0

1064 G11

0

2

8

12 14 16 18 20 22 24

4

6

10

+

–

POWER SUPPLY VOLTAGE (V – V )

1064 G10

1064fb

5

LTC1064

U

PIN FUNCTIONS

V⁺, V^–(Pins 7, 19): Power Supplies. They should be

bypassed with a 0.1µF ceramic capacitor. Low noise,

nonswitching power supplies are recommended. The de-

vice operates with a single 5V supply and with dual

supplies. The absolute maximum operating power supply

voltage is ±8V.

AGND (Pin 6): Analog Ground. When the LTC1064 oper-

ates with dual supplies, Pin 6 should be tied to system

ground.WhentheLTC1064operateswithasinglepositive

supply, the analog ground pin should be tied to 1/2 supply

and it should be bypassed with a 1µF solid tantalum in

parallel with a 0.1µF ceramic capacitor, Figure 1. The

positive input of all the internal op amps, as well as the

common reference of all the internal switches, are inter-

nally tied to the analog ground pin. Because of this, a very

“clean” ground is recommended.

50/100 (Pin 17): By tying Pin 17 to V⁺, all filter sections

operate with a clock-to-center frequency ratio internally

setat50:1. WhenPin17isatmid-supplies, sectionsBand

C operate with (f_CLK/f_O) = 50:1 and sections A and D

operate at 100:1. When Pin 17 is shorted to the negative

supply pin, all filter sections operate with (f_CLK/f_O) =

100:1.

CLK (Pin 18): Clock. For ±5V supplies the logic threshold

level is 1.4V. For ±8V and 0V to 5V supplies the logic

threshold levels are 2.2V and 3V respectively. The logic

threshold levels vary ±100mV over the full military tem-

perature range. The recommended duty cycle of the input

clockis50%,althoughforclockfrequenciesbelow500kHz,

the clock “on” time can be as low as 200ns. The maximum

clock frequency for ±5V supplies is 4MHz. For ±7V

supplies and above, the maximum clock frequency is

7MHz.

1

24

23

22

21

20

2

+

V

LTC1064

3

4

5

5k

V+/2

6

19

–

AGND

V

CLOCK INPUT

+

7

18

+

V

= 15V, TRIP VOLTAGE = 7V

= 10V, TRIP VOLTAGE = 6.4V

= 5V, TRIP VOLTAGE = 3V

+

V

CLK

+

1µF

8

17

16

15

14

13

0.1µF

50/100

9

10

11

12

TO DIGITAL

GROUND

ANALOG

GROUND

PLANE

1064 F01

NOTE: PINS 5, 8, 20, IF NOT USED, SHOULD BE CONNECTED TO PIN 6

Figure 1. Single Supply Operation

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6

LTC1064

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APPLICATIONS INFORMATION

ANALOG CONSIDERATIONS

Grounding and Bypassing

Figure 2 shows an example of an ideal ground plane

design for a 2-sided board. Of course this much ground

plane will not always be possible, but users should strive

to get as close to this as possible. Protoboards are not

recommended.

The LTC1064 should be used with separated analog and

digital ground planes and single point grounding

techniques.

Pin 6 (AGND) should be tied directly to the analog ground

plane.

Buffering the Filter Output

Pin 7 (V⁺) should be bypassed to the ground plane with a

0.1µF ceramic capacitor with leads as short as possible.

Pin 19 (V^–) should be bypassed with a 0.1µF ceramic

capacitor. For single supply applications, V^–can be tied to

the analog ground plane.

For good noise performance, V⁺and V^–must be free of

noise and ripple.

When driving coaxial cables and 1× scope probes, the

filter output should be buffered. This is important espe-

cially when high Qs are used to design a specific filter.

Inadequate buffering may cause errors in noise, distor-

tion, Q and gain measurements. When 10× probes are

used, buffering is usually not required. An inverting buffer

is recommended especially when THD tests are per-

formed. As shown in Figure 3, the buffer should be

adequately bypassed to minimize clock feedthrough.

All analog inputs should be referenced directly to the

single point ground. The clock inputs should be shielded

from and/or routed away from the analog circuitry and a

separate digital ground plane used.

PIN 1 IDENT

1

24

23

22

21

20

19

18

17

16

15

14

13

V

IN

2

3

4

FOR BEST HIGH FREQUENCY RESPONSE

PLACE RESISTORS PARALLEL TO DOUBLE-

SIDED COPPER CLAD BOARD AND LAY FLAT

(4 RESISTORS SHOWN HERE TYPICAL)

5k

–7.5V

0.1µF CERAMIC

5

LTC1064

6

7.5V

7

8

CLOCK

DIGITAL

GROUND

PLANE

0.1µF

CERAMIC

9

(SINGLE POINT

GROUND)

10

11

12

ANALOG

GROUND

PLANE

NOTE: CONNECT ANALOG AND DIGITAL

GROUND PLANES AT A SINGLE POINT AT

THE BOARD EDGE

1064 F02

Figure 2. Example Ground Plane Breadboard Technique for LTC1064

1064fb

7

LTC1064

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APPLICATIONS INFORMATION

Noise

Offset Nulling

All the noise performance mentioned excludes the clock

feedthrough. Noise measurements will degrade if the

already described grounding bypassing and buffering

techniques are not practiced. The graph Wideband Noise

vs Q in the Typical Performance Characteristics section is

a very good representation of the noise performance of

this device.

Lowpass filters may have too much DC offset for some

users. A servo circuit may be used to actively null the

offsets of the LTC1064 or any LTC switched-capacitor

filter.ThecircuitshowninFigure4willnulloffsetstobetter

than300µV. Thiscircuittakessecondstosettlebecauseof

the integrator pole frequency.

+

SEPARATE V POWER SUPPLY TRACE FOR BUFFER

R12

FROM

+

R11

FILTER OUTPUT

0.1µF

10k

1µF

V

IN

R21

R31

R22

R32

10k

R1

1M

4

–

LT^®318

+

V

TRACE FOR FILTER

R3

100k

+

LT1007

LT1056

V

OUT

TO FILTER

FIRST SUMMING

NODE

C1

19

LT1012

LTC1064

0.1µF

+

7

POSITIVE

SUPPLY

7

0.1µF

–

0.1µF

R2

1M

1µF

0.1µF

NEGATIVE

SUPPLY

C2

0.1µF

+

C1 = C2 = LOW LEAKAGE FILM

(I.E., POLYPROPYLENE)

R1 = R2 = METAL FILM 1%

1064 F04

1064 F03

Figure 3. Buffering the Output of a 4th Order Bandpass Realization

Figure 4. Servo Amplifier

W

U

ODES OF OPERATIO

PRIMARY MODES

Mode 1

R3

R2

In Mode 1, the ratio of the external clock frequency to the

center frequency of each 2nd order section is internally

fixed at 50:1 or 100:1. Figure 5 illustrates Mode 1 provid-

ing 2nd order notch, lowpass and bandpass outputs.

Mode 1 can be used to make high order Butterworth

lowpass filters; it can also be used to make low Q notches

and for cascading 2nd order bandpass functions tuned at

thesamecenterfrequencywithunitygain.Mode1isfaster

than Mode 3. Note that Mode 1 can only be implemented

with three of the four LTC1064 sections because Section

D has no externally available summing node. Section D,

however, can be internally connected in Mode 1 upon

special request.

BP

LP

N

S

R1

V

IN

–

+

–

+

Σ

∫

1/4 LTC1064

AGND

R2

R1

R3

R1

R2

R1

R3

R2

f

CLK

100(50)

f

=

; f = f ; H

= –

; H

= –

; H = –

ON1

; Q =

O

n

O

OLP

OBP

1064 F05

Figure 5. Mode 1: 2nd Order Filter Providing Notch,

Bandpass and Lowpass

1064fb

8

LTC1064

W

U

ODES OF OPERATIO

Mode 3

SECONDARY MODES

Mode 1b

Mode3isthesecondoftheprimarymodes. InMode3, the

ratio of the external clock frequency to the center fre-

quencyofeach2ndordersectioncanbeadjustedabove or

below 50:1 or 100:1. Side D of the LTC1064 can only be

connected in Mode 3. Figure 6 illustrates Mode 3, the

classical state variable configuration, providing highpass,

bandpass and lowpass 2nd order filter functions. Mode 3

is slower than Mode 1. Mode 3 can be used to make high

order all-pole bandpass, lowpass, highpass and notch

filters.

Mode1bisderivedfromMode1.InMode1b,Figure7,two

additional resistors R5 and R6 are added to alternate the

amount of voltage fed back from the lowpass output into

the input of the SA (or SB or SC) switched-capacitor

summer. This allows the filter’s clock-to-center frequency

ratio to be adjusted beyond 50:1 or 100:1. Mode 1b

maintains the speed advantages of Mode 1.

R6

R5

When the internal clock-to-center frequency ratio is set at

50:1, the design equations for Q and bandpass gain are

different from the 100:1 case. This was done to provide

speed without penalizing the noise performance.

R3

R2

BP

LP

N

S

R1

V

IN

–

+

–

+

Σ

∫

C

1064 F07

1/4 LTC1064

R4

R3

R2

AGND

BP

LP

HP

S

R3

R2

f

R6

R5 + R6

CLK

f

O

=

; f = f Q =

O;

;

n

√

100(50) R5 + R6

R1

V

IN

–

+

R2

R1

R6

R5 + R6

–

+

R2

R1

f

CLK

H

(f→ 0) = H

f→ = –

; H

= –

;

ON1

OBP

ON2

OLP

Σ

(

)

∫

2

1064 F06

1/4 LTC1064

R3

R1

H

= –

; R5⏐⏐R6 ≤ 5k

1064 F07 Eq

AGND

Figure 7. Mode 1b: 2nd Order Filter Providing Notch,

Bandpass and Lowpass

R2

R4

R3 R2

R2

R1

f

CLK

MODE 3 (100:1):

MODE 3 (50:1):

f

=

; Q =

; H

= –

;

O

OHP

√

R2 R4

100

R3

R1

R4

R1

H

= –

; H

= –

OBP

OLP

Mode 2

R2

R4

R2

1.005

f

R2

R4

√

CLK

50

f

O

=

; Q =

;

Mode 2 is a combination of Mode 1 and Mode 3, as shown

in Figure 8. With Mode 2, the clock-to-center frequency

ratio f_CLK/f_Ois always less than 50:1 or 100:1. The

advantage of Mode 2 is that it provides less sensitivity to

resistor tolerances than does Mode 3. As in Mode 1,

Mode 2 has a notch output which depends on the clock

frequency and the notch frequency is therefore less than

the center frequency f_O.

√

R2

–

R3 16R4

R3

R1

R3

R2

R1

R4

R1

H

= –

; H

= –

; H

= –

OHP

OBP

OLP

1 –

16R4

NOTE: THE 50:1 EQUATIONS FOR MODE 3 ARE DIFFERENT FROM THE EQUATIONS

FOR MODE 3 OPERATIONS OF THE LTC1059, LTC1060 AND LTC1061. START WITH

f , CALCULATE R2/R4, SET R4; FROM THE Q VALUE, CALCULATE R3:

O

R2

R3 =

; THEN CALCULATE R1 TO SET

R2 THE DESIRED GAIN.

1.005

Q

R2

R4

1064 F06 Eq

+

√

16R4

When the internal clock-to-center frequency ratio is set at

50:1, the design equations for Q and bandpass gain are

different from the 100:1 case.

Figure 6. Mode 3: 2nd Order Filter Providing Highpass,

Bandpass and Lowpass

1064fb

9

LTC1064

W

U

ODES OF OPERATIO

R2

R1

R4

R3

R2

R4

f

R3

R2

R4

f

CLK

50

CLK

MODE 2 (100:1):

f

=

1 +

; f

=

; Q =

1 +

; H

= –

OLP

;

O

n

√

R2

R4

100

1 +

R2

R1

R3

R1

R2

R1

f

CLK

2

BP

LP

N

S

H

= –

; H (f→ 0) = –

ON1

; H

f→ = –

OBP

ON2

(

)

R2

1 +

R4

R1

V

IN

–

+

R2

R1

R2

–

R2

R4

+

1.005 1 +

f

R2

R4

f

√

CLK

50

CLK

50

Σ

∫

f

=

1 +

; f

=

; Q =

; H

= –

;

MODE 2 (50:1):

O

n

OLP

√

R2

1 +

–

R3 16R4

R4

1064 F08

1/4 LTC1064

R3

R1

R3

R2

R1

; H

1 +

f

R2

R1

AGND

CLK

2

H

= –

; H (f→ 0) = –

ON1

=

ON2

f→

=

–

OBP

(

)

R2

R4

1 –

16R4

NOTE: THE 50:1 EQUATIONS FOR MODE 2 ARE DIFFERENT FROM THE EQUATIONS

FOR MODE 2 OPERATION OF THE LTC1059, LTC1060 AND LTC1061. START WITH

f , CALCULATE R2/R4, SET R4; FROM THE Q VALUE, CALCULATE R3:

O

R2

R3 =

; THEN CALCULATE R1 TO SET THE DESIRED GAIN.

1.005

Q

R2

1 +

+

√

1064 F08Eq

R4 16R4

Figure 8. Mode 2: 2nd Order Filter Providing Notch, Bandpass and Lowpass

outputscanbesummeddirectlyintotheinvertinginputof

the next section. The topology of Mode 3a is useful for

elliptic highpass and notch filters with clock-to-cutoff

frequency ratios higher than 100:1. This is often required

to extend the allowed input signal frequency range and to

avoid premature aliasing.

Mode 3a

This is an extension of Mode 3 where the highpass and

lowpass outputs are summed through two external resis-

torsR_HandR_Ltocreateanotch.ThisisshowninFigure 9.

Mode 3a is more versatile than Mode 2 because the notch

frequency can be higher or lower than the center fre-

quency of the 2nd order section. The external op amp of

Figure 9 is not always required. When cascading the

sections of the LTC1064, the highpass and lowpass

When the internal clock-to-center frequency ratio is set at

50:1, the design equations for Q and bandpass gain are

different from the 100:1 case.

R2

R4

f

R

R2

R1

R3

R1

f

CLK

H

CLK

MODE 3a (100:1):

f

=

; f

=

; H =

OHP

; HOBP =

–

;

O

n

√

100

L

R

R2

R1

R4

R1

R

R4

R1

f

G

CLK

2

C

H

f

= –

; H (f→ 0) =

; H

f→

=

;

OLP

ON1

ON2

(

) (

)

(

)

(

) (

)

H

L

R

G

R

R3

R2

R4

G

R4

R3

R2

(f=f ) = Q

O

H

–

H

; Q =

ON

=

OLP

OHP

(

)

R

√

L

H

R2

R1

f

R2

R4

f

R

H

CLK

50

CLK

50

–

;

1 +

; f

=

n

; H

f→

=

MODE 3a (50:1):

NOTCH

O

OHP

(

)

√

2

R

L

R

G

BP

LP

R

HP

S

R3

R1

R3

R2

R4

1.005

R1

R4

R1

√

–

H

= –

; H (f=0) =

Q =

;

–

+

V

IN

–

OBP

OLP

+

L

R2

–

R2

1 –

–

Σ

∫

16R4

R3 16R4

+

NOTE: THE 50:1 EQUATIONS FOR MODE 3A ARE DIFFERENT FROM

1/4 LTC1064

THE EQUATIONS FOR MODE 3A OPERATION OF THE LTC1059,

R

H

AGND

LTC1060 AND LTC1061. START WITH f , CALCULATE R2/R4, SET R4;

O

FROM THE Q VALUE, CALCULATE R3:

R2

EXTERNAL OP AMP OR INPUT

OP AMP OF THE LTC1064,

R3 =

; THEN CALCULATE R1 TO

R2

SET THE DESIRED GAIN.

SIDE A, B, C, D

1.005 R2

1064 F09

1064 F09Eq

+

√

Q

R4 16R4

Figure 9. Mode 3a: 2nd Order Filter Providing Highpass, Bandpass, Lowpass and Notch

1064fb

10

LTC1064

U

TYPICAL APPLICATIO S

Wideband Bandpass: Ratio of High to Low Corner Frequency Equal to 2

R14

Amplitude Response

1

2

24

23

22

21

20

19

18

17

16

15

14

13

INV B

HPB/NB

BPB

INV C

HPC/NC

BPC

R23

R33

R43

R24

R34

R44

15

0

3

f

= 7MHz

CLK

4

–15

–30

–45

–60

–75

–90

–105

LPB

LPC

V

5

OUT

SB

SC

6

–

C1

AGND

V

–5V TO –8V

LTC1064

0.1µF

7

+

f

= 2MHz

CLK

5V TO 8V

V

CLK

50/100

LPD

f

≤ 7MHz

CLK

0.1µF

8

SA

R41

R31

R21

9

LPA

C2

R42

R32

R22

R12

10

11

12

BPA

BPD

V

= ±8V

S

HPA/NA

INV A

HPD

10k

100k

INPUT FREQUENCY (Hz)

1M

R11

INV D

V

IN

1064 TA04

R13

RESISTOR VALUES:

R11 = 16k

R12 = 10k

R21 = 16k

R22 = 10k

R31 = 7.32k R41 = 10k

R32 = 22.6k R42 = 13.3k

R13 = 23.2k R23 = 13.3k R33 = 21.5k R43 = 10k

R14 = 6.8k R24 = 20k R34 = 15.4k R44 = 32.4k

NOTE: FOR f ≥ 3MHz, USE C1 = C2 = 22pF

1064 TA03

CLK

Quad Bandpass Filter with Center Frequency Equal to f , 2f , 3f and 4f

O

10.5k

R12

R13

1

2

24

23

22

21

20

19

18

17

16

15

14

13

Amplitude Response

V

INV B

HPB/NB

BPB

INV C

HPC/NC

BPC

V

IN1

IN2

R22

R32

R23

R33

R43

5

f

= 2MHz

CLK

0

–5

3

4

LPB

LPC

5

–10

–15

–20

–25

–30

–35

–40

SB

SC

6

–

AGND

V

–5V TO –8V

0.1µF

LTC1064

7

+

V

CLK

50/100

LPD

f

5V TO 8V

CLK

8

SA

0.1µF

R44

R34

R24

9

LPA

R31

R21

10

11

12

BPA

BPD

HPA/NA

INV A

HPD

R11

R14

0

10

20

30

50

40

INV D

V

IN4

V

IN3

INPUT FREQUENCY (kHz)

20k

17.4k

20k

1064 TA06

20k

–

+

RESISTOR VALUES:

R11 = 249k R21 = 10k R31 = 249k

R12 = 249k R22 = 10k R32 = 249k

V

LT1056

OUT

R13 = 499k R23 = 10k R33 = 174k R43 = 17.8k

R14 = 453k R24 = 10k R34 = 249k R44 = 40.2k

1064 TA05

1064fb

11

LTC1064

TYPICAL APPLICATIO S

U

8th Order Bandpass Filter with 2 Stopband Notches

R

L2

R

H2

R

Amplitude Response

H3

R12

1

2

24

23

22

21

20

19

18

17

16

15

14

13

10

0

INV B

HPB/NB

BPB

INV C

HPC/NC

BPC

V

f

= ±5V

S

CLK

R22

R32

R42

R23

R33

R43

= 1.28MHz

+

PIN 17 AT V

3

–10

–20

–30

–40

–50

–60

–70

4

LPB

LPC

R

L3

5

SB

SC

6

–

AGND

V

–5V TO –8V

LTC1064

0.1µF

7

+

V

CLK

50/100

LPD

1.28MHz

5V TO 8V

8

+

0.1µF

TO V

SA

R41

R31

R21

R44

R34

R24

9

LPA

10

11

12

BPA

BPD

1

5

10

20

40

100

HPA/NA

INV A

HPD

INPUT FREQUENCY (kHz)

R11

V

INV D

IN

1064 TA08

V

OUT

RESISTOR VALUES:

R11 = 46.95k R21 = 10k

R12 = 93.93k R22 = 10k

R23 = 16.3k

R31 = 38.25k R41 = 11.81k

R32 = 81.5k

R33 = 70.3k

R42 = 14.72k

R43 = 10k

R

= 27.46k

= 17.9k

R

= 6.9k

= 69.7k

H2

H3

L2

L3

R24 = 13.19k R34 = 39.42k R44 = 10.5k

+

–

NOTE 1: THE V , V PINS SHOULD BE BYPASSED WITH A 0.1µF TO 0.22µF

CERAMIC CAPACITOR, RIGHT AT THE PINS.

NOTE 2: THE RATIOS OF ALL (R2/R4) RESISTORS SHOULD BE MATCHED

TO BETTER THAN 0.25%. THE REMAINING RESISTORS SHOULD BE

BETTER THAN 0.5% ACCURATE.

1064 TA07

C-Message Filter

R13

Amplitude Response

1

2

24

23

22

21

20

19

18

17

16

15

14

13

INV B

HPB/NB

BPB

INV C

HPC/NC

BPC

10

0

R22

R32

R42

R23

R33

R43

V

= ±5V

S

3

–10

–20

–30

–40

–50

–60

–70

4

LPB

LPC

0.1µF

5

SB

SC

R14

6

–

–5V

AGND

V

LTC1064

7

3.5795MHz

16

+

f

=

V

CLK

50/100

LPD

5V

CLK

0.1µF

R12

R41

R31

R21

8

SA

R44

R34

R24

9

LPA

10

11

12

BPA

BPD

HPA/NA

INV A

HPD

0

1

2

3

4

5

R11

INPUT FREQUENCY (kHz)

V

IN

INV D

V

OUT

1064 TA10

RESISTOR VALUES:

R11 = 88.7k R21 = 10k

R31 = 35.7k R41 = 88.7k

R12 = 10k

R22 = 44.8k R32 = 33.2k R42 = 24.9k

R13 = 15.8k R23 = 48.9k R33 = 63.5k R43 = 25.5k

R14 = 15.8k R24 = 44.8k R34 = 16.5k R44 = 24.9k

1064 TA09

1064fb

12

LTC1064

U

TYPICAL APPLICATIO S

8th Order Chebyshev Lowpass Filter with a Passband

Ripple of 0.1dB and Cutoff Frequency up to 100kHz

R13

Amplitude Response

1

2

24

23

22

21

20

19

18

17

16

15

14

13

INV B

HPB/NB

BPB

INV C

HPC/NC

BPC

15

0

R22

R32

R42

R23

R33

R43

R14

3

R12

4

–15

–30

–45

–60

–75

–90

–105

LPB

LPC

5

SB

SC

6

–

–5V TO –8V

= 5MHz

AGND

V

0.1µF

LTC1064

7

+

V

CLK

50/100

LPD

f

5V TO 8V

CLK

0.1µF

8

5V TO 8V

R44

SA

R41

R31

R21

9

LPA

V

f

= ±8V

= 5MHz

PASSBAND RIPPLE = 0.1dB

S

CLK

R34

R24

10

11

12

BPA

BPD

HPA/NA

INV A

HPD

10k

100k

1M

R11

V

INV D

INPUT FREQUENCY (Hz)

IN

V

OUT

1064 TA12

RESISTOR VALUES:

R11 = 100.86k R21 = 16.75k R31 = 23.6k R41 = 99.73k

R12 = 25.72k R22 = 20.93k R32 = 45.2k R42 = 25.52k

R13 = 16.61k R23 = 10.18k R33 = 68.15k R43 = 99.83k

R14 = 13.84k R24 = 11.52k R34 = 17.72k R44 = 25.42k

1064 TA11

FOR f

> 3MHz, ADD C2 = 10pF ACROSS R42

C3 = 10pF ACROSS R43

CLK

C4 = 10pF ACROSS R44

WIDEBAND NOISE = 170µV

RMS

1064fb

13

LTC1064

U

TYPICAL APPLICATIO S

8th Order Clock-Sweepable Lowpass Elliptic Antialiasing Filter

R

H1

R

L1

R

H2

Amplitude Response

R

L2

0

–15

–30

–45

–60

–75

–90

–105

R11

1

2

24

23

22

21

20

19

18

17

16

15

14

13

INV B

HPB/NB

BPB

INV C

HPC/NC

BPC

V

IN

R22

R32

R42

R21

R31

R41

3

4

LPB

LPC

5

SB

SC

6

–

–7.5V

AGND

V

LTC1064

7

0.1µF

+

V

CLK

50/100

LPD

f

≤ 2MHz

7.5V

CLK

0.1µF

8

–7.5V

SA

R43

R44

R34

R24

9

LPA

R33

R23

10

11

12

BPA

BPD

40

FREQUENCY (kHz)

60

70

0

10

20

30

50

HPA/NA

INV A

HPD

8TH ORDER CLOCK-SWEEPABLE LOWPASS

ELLIPTIC ANTIALIASING FILTER MAINTAINS,

INV D

V

OUT

R

L3

FOR 0.1Hz ≤ f

≤ 20kHz, A ±0.1dB MAX

CUTOFF

PASSBAND ERROR AND 72dB MIN STOPBAND

ATTENUATION AT 1.5 × f

R

H3

CUTOFF

RESISTOR VALUES:

R11 = 19.1k R21 = 10k

R22 = 10k

TOTAL WIDEBAND NOISE = 150µV

,

RMS

R31 = 13.7k R41 = 15.4k

R32 = 23.7k R42 = 10.2k

R

= 14k

= 26.7k

= 10k

R

H1

R

H2

R

H3

= 30.9k

= 76.8k

= 60.2k

THD = 70dB (0.03%) FOR V = 3V

,

RMS

L1

L2

L3

IN

f

/f = 100:1. THIS FILTER AVAILABLE

CLK CUTOFF

R23 = 11.3k R33 = 84.5k R43 = 10k

R24 = 15.4k R34 = 15.2k R44 = 42.7k

AS LTC1064-1 WITH INTERNAL THIN FILM

RESISTORS

1064 TA14

NOTE: FOR t

>15kHz, ADD A 5pF CAPACITOR ACROSS R41 AND R43

1064 TA13

CUTOFF

1064fb

14

LTC1064

U

TYPICAL APPLICATIO S

Dual 4th Order Bessel Filter with 140kHz Cutoff Frequency

R13

Amplitude Response

R12

1

2

24

23

22

21

20

19

18

17

16

15

14

13

INV B

HPB/NB

BPB

INV C

HPC/NC

BPC

V

IN1

15

0

R22

R32

R42

R23

R33

R43

3

–15

–30

–45

–60

–75

–90

–105

4

LPB

LPC

5

SB

SC

V

OUT1

6

–

–8V

0.1µF

AGND

V

LTC1064

7

+

7MHz

CLOCK

8V

V

CLK

50/100

LPD

8V

8

0.1µF

SA

V

OUT2

9

LPA

V

CLK

= ±8V

= 7MHz

S

R44

R34

R24

R41

R31

R21

10

11

12

f

BPA

BPD

HPA/NA

INV A

HPD

10k

100k

1M

R11

INPUT FREQUENCY (Hz)

INV D

V

IN2

R14

1064 TA16

RESISTOR VALUES:

R11 = 14.3k R21 = 13k

R31 = 7.5k

R41 = 10k

R42 = 10k

R12 = 15.4k R22 = 15.4k R32 = 7.5k

R13 = 3.92k R23 = 20k

R14 = 3.92k R24 = 20k

R33 = 27.4k R43 = 40k

R34 = 6.8k

R44 = 10k

WIDEBAND NOISE = 64µV

RMS

1064 TA15

f_CLK

f_–3dB

65

1

8th Order Linear Phase (Bessel) Filter with

=

R12

R11

Amplitude Response

1

2

24

23

22

21

20

19

18

17

16

15

14

13

INV B

HPB/NB

BPB

INV C

HPC/NC

BPC

V

IN1

R21

R31

R41

R22

R32

R42

15

0

3

4

–15

–30

–45

–60

–75

–90

–105

LPB

LPC

5

SB

SC

TO R13

6

–

–5V TO –8V

0.1µF

AGND

V

LTC1064

7

f

+

CLK

V

CLK

50/100

LPD

5V TO 8V

≤7MHz

8

0.1µF

+

SA

TO V

V

OUT

V

= ±8V

S

9

LPA

f

= 4.5MHz

CLK

–3dB

R44

R34

R24

R43

R33

R23

= 50% DUTY CYCLE

10

11

12

BPA

BPD

= 70kHz

HPA/NA

INV A

HPD

10k

100k

INPUT FREQUENCY (Hz)

1M

R13

FROM

PIN 20

INV D

R14

1064 TA18

RESISTOR VALUES:

R11 = 34.8k R21 = 34.8k R31 = 14.3k R41 = 40.2k

R12 = 10.5k R22 = 45.3k R32 = 22.1k R42 = 39.2k

R13 = 12.7k R23 = 34.8k R33 = 24.3k R43 = 20k

R14 = 20k

R24 = 34.8k R34 = 13.3k R44 = 20k

WIDEBAND NOISE = 70µV

RMS

1064 TA17

1064fb

15

LTC1064

TYPICAL APPLICATIO S

U

Dual 5th Order Chebyshev Lowpass Filter with

50kHz and 100kHz Cutoff Frequencies

R14

R13a

R13b

1

2

24

23

22

21

20

19

18

17

16

15

14

13

Amplitude Response

INV B

HPB/NB

BPB

INV C

HPC/NC

BPC

V

IN2

R23

R33

R43

R24

R34

R44

C2

1000pF

15

0

PASSBAND RIPPLE = 0.2dB

3

4pF

4

LPB

LPC

–15

–30

–45

–60

–75

–90

–105

V

C

OUT2

5

SB

SC

f

= 100kHz

2pF

6

–

–8V

AGND

V

LTC1064

7

5MHz

T L

0.1µF

+

V

CLK

50/100

LPD

8V

2

22pF

8

V

C

0.1µF

OUT1

SA

f

= 50kHz

R42

R32

R22

9

LPA

R41

10

11

12

39pF

BPA

BPD

R31

R21

HPA/NA

INV A

HPD

R11a

R11b

10k

50k 100k

INPUT FREQUENCY (Hz)

1M

INV D

V

IN1

C1

1000pF

R12

1064 TA20

RESISTOR VALUES:

R11a = 4.32k R21 = 11.8k R31 = 29.4k R41 = 10k

R11b = 27.4k R22 = 20k R32 = 21.5k R42 = 31.6k

R12 = 10.5k

R13a = 3k

R23 = 11.8k R33 = 29.4k R43 = 10k

R24 = 20k

R34 = 21.6k R44 = 31.6k

R13b = 29.4k

R14 = 10.5k

1064 TA19

1064fb

16

LTC1064

U

PACKAGE DESCRIPTIO

J Package

24-Lead CERDIP (Narrow .300 Inch, Hermetic)

(Reference LTC DWG # 05-08-1110)

1.290

(32.77)

MAX

21

24

23

22

20

19

18

17

16

15

10

14

11

13

12

.025

(0.635)

RAD TYP

.220 – .310

(5.588 – 7.874)

1

2

3

4

5

6

7

8

9

.005

(0.127)

MIN

.200

(5.080)

MAX

.300 BSC

(7.62 BSC)

.015 – .060

(0.381 – 1.524)

.008 – .018

(0.203 – 0.457)

0° – 15°

.045 – .065

(1.143 – 1.651)

.125

(3.175)

MIN

.100

(2.54)

BSC

NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE

OR TIN PLATE LEADS

.014 – .026

(0.360 – 0.660)

J24 0801

OBSOLETE PACKAGE

1064fb

17

LTC1064

U

PACKAGE DESCRIPTIO

N Package

24-Lead PDIP (Narrow .300 Inch)

(Reference LTC DWG # 05-08-1510)

1.265*

(32.131)

MAX

24

23

22

21

20

19

18

17

16

15

10

14

11

13

12

.255 ± .015*

(6.477 ± 0.381)

3

4

5

6

7

8

9

1

2

.300 – .325

(7.620 – 8.255)

.045 – .065

(1.143 – 1.651)

.130 ± .005

(3.302 ± 0.127)

.020

(0.508)

MIN

.065

(1.651)

TYP

.008 – .015

(0.203 – 0.381)

+.035

N24 1103

.120

(3.048)

MIN

.018 ± .003

(0.457 ± 0.076)

.100

(2.54)

BSC

.325

–.015

+0.889

8.255

(

)

–0.381

NOTE:

INCHES

1. DIMENSIONS ARE

MILLIMETERS

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)

1064fb

18

LTC1064

U

PACKAGE DESCRIPTIO

SW Package

24-Lead Plastic Small Outline (Wide .300 Inch)

(Reference LTC DWG # 05-08-1620)

.050 BSC .045 ±.005

.030 ±.005

TYP

.598 – .614

(15.190 – 15.600)

NOTE 4

N

24 23 22 21 20 19 18

16 15 14 13

17

N

.325 ±.005

.420

MIN

.394 – .419

(10.007 – 10.643)

NOTE 3

1

2

3

N/2

RECOMMENDED SOLDER PAD LAYOUT

.291 – .299

(7.391 – 7.595)

NOTE 4

2

3

5

7

8

9

10

1

4

6

11 12

.037 – .045

.093 – .104

.010 – .029

(0.940 – 1.143)

× 45°

(2.362 – 2.642)

(0.254 – 0.737)

.005

(0.127)

RAD MIN

0° – 8° TYP

.050

(1.270)

BSC

.004 – .012

.009 – .013

(0.102 – 0.305)

NOTE 3

(0.229 – 0.330)

.014 – .019

.016 – .050

(0.356 – 0.482)

TYP

(0.406 – 1.270)

NOTE:

1. DIMENSIONS IN

INCHES

(MILLIMETERS)

S24 (WIDE) 0502

2. DRAWING NOT TO SCALE

3. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.

THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS

4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)

1064fb

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

19

LTC1064

TYPICAL APPLICATIO S

U

Clock-Tunable, 30kHz to 90kHz 8th Order Notch Filter

Providing Notch Depth in Excess of 60dB

R13

R14

C2

Amplitude Response

1

2

24

23

22

21

20

19

18

17

16

15

14

13

INV B

HPB/NB

BPB

INV C

HPC/NC

BPC

10

0

R23

R33

R22

R32

R42

BW

3

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

–110

4

LPB

LPC

0.1µF

5

SB

SC

6

–

C1

AGND

V

–8V

LTC1064

7

+

8V

V

CLK

50/100

LPD

f

≤ 5MHz

CLK

C3

0.1µF

8

SA

R12

9

LPA

V

f

= ±8V

= 4MHz

R31

R21

R44

R34

R24

S

CLK

10

11

12

C1 = C2 = C3 = 15pF

BPA

BPD

THE NOTCH DEPTH FROM

5kHz TO 30kHz IS 50dB

HPA/NA

INV A

HPD

10

30

40

50

60

70

20

R11

WIDEBAND NOISE = 300µV

RMS

INV D

V

IN1

INPUT FREQUENCY (kHz)

R

L4

0.1%

1064 TA22

R

G

R

H4

0.1%

–

+

RESISTOR VALUES:

R11 = 50k R21 = 5k

R31 = 50k

R

= 68.1k

L4

H4

LT1056

V

G

OUT

R12 = 15.4k R22 = 10k R32 = 88.7k R42 = 48.7k

= 10k (0.1%)

R13 = 10k

R23 = 10k R33 = 100k

R14 = 9.09k R24 = 10k R34 = 63.4k R44 = 12.4k

1064 TA21

RELATED PARTS

PART NUMBER

DESCRIPTION

COMMENT

LTC1061

Triple Universal Filter Building Block

Quad Universal Building Blocks

Three Filter Building Blocks in a 20-Pin Package

f :f = 25:1, 50:1, 100:1 and 200:1

CLK

LTC1068 Series

LTC1164

O

Low Power, Quad Universal Filter Building Block

High Speed, Quad Universal Building Block

Low Noise, Low Power Pin-for-Pin LTC1064 Compatible

Up to 250kHz Center Frequency

LTC1264

1064fb

LT/LT 0905 REV B • PRINTED IN USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

20

●

(408) 432-1900 FAX: (408) 434-0507 www.linear.com


型号：	LTC1064-2CSW#TR
厂家：	Linear
描述：	LTC1064-2 - Low Noise, High Frequency, 8th Order Butterworth Lowpass Filter; Package: SO; Pins: 16; Temperature Range: 0°C to 70°C LTE 光电二极管有源滤波器
文件：	总20页 (文件大小：247K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LTC1064-2CSW#TR [Linear]

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