LTC1064-4MJ

LTC1064-4MJ Datasheet

LTC1064-4

Part	Datasheet
LTC1064-4MJ	LTC1064-4MJ (pdf)

PDF Datasheet Preview
LTC1064-4 Low Noise, 8th Order, Clock Sweepable Cauer Lowpass Filter • 8th Order Filter in a 14-Pin Package • 80dB or More Stopband Attenuation at 2 x fCUTOFF • 50:1, fCLK to fCUTOFF Ratio Cauer 100:1, fCLK to Ratio Transitional • 135µVRMS Total Wideband Noise • THD or Better • 100kHz Maximum fCUTOFF Frequency • Operates up to ±8V Power Supplies • Input Frequency Range up to 50 Times the Filter Cutoff Frequency U APPLICATIO S • Antialiasing Filters • Telecom Filters • Sinewave Generators , LTC and LT are registered trademarks of Linear Technology Corporation. LTCMOS is a trademark of Linear Technology Corporation. DESCRIPTIO The is an 8th order, clock sweepable Cauer lowpass switched capacitor filter. An external TTL or CMOS clock programs the value of the filter’s cutoff frequency. With Pin 10 at V+, the fCLK to fCUTOFF ratio is 50:1 the filter has a Cauer response and with compensation the passband ripple is ±0.1dB. The stopband attenuation is 80dB at 2 x fCUTOFF. Cutoff frequencies up to 100kHz can be achieved. With Pin 10 at the fCLK to ratio is 100:1, the filter has a transitional ButterworthCauer response with lower noise and lower delay nonlinearity than the Cauer response. The stopband attenuation at x is 92dB. Cutoff frequencies up to 50kHz can be achieved. The LTC1064-4 features low noise and low harmonic distortion even when input voltages up to 3VRMS are applied. The LTC1064-4 overall performance competes with equivalent multiple op amp active realizations. The LTC1064-4 is pin compatible with the LTC1064-1, LTC1064-2 and LTC1064-3. The LTC1064-4 is manufactured using Linear Technology’s enhanced LTCMOSTM silicon gate process. TYPICAL APPLICATIO 8th Order Clock Sweepable Lowpass Elliptic Filter 8V 0.1µF INV C R h, I 2 VIN COMP2* 13 3 AGND LTC1064-4 fCLK 11 CLOCK TTL, 5 AGND 50/100 10 6 COMP1* 7 INV A 9 VOUT VOUT 0.1µF 1064 TA01 * FOR FREQUENCIES ABOVE 20kHz AND MINIMUM PASSBAND RIPPLE REFER TO THE PIN DESCRIPTION SECTION FOR COMPENSATION GUIDELINES. NOTE:THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1µF CAPACITOR CLOSE TO THE PACKAGE. BYPASSING PIN 10 WITH 0.1µF CAPACITOR REDUCES CLOCK FEEDTHROUGH. THE CONNECTION BETWEEN PINS 7 AND 14 SHOULD BE PHYSICALLY DONE UNDER THE PACKAGE. VOUT/VIN dB Frequency Response 20 TA = 25°C fCLK = 5MHz, 50:1 CCOMP1 = 30pF, CCOMP2 = 18pF fCLK = 2MHz, 50:1 fCLK = 1MHz, 100:1 100k FREQUENCY Hz 1064-4 TA01b

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LTC1064-4

Low Noise, 8th Order, Clock Sweepable Cauer Lowpass Filter
• 8th Order Filter in a 14-Pin Package
• 80dB or More Stopband Attenuation at 2 x fCUTOFF
• 50:1, fCLK to fCUTOFF Ratio Cauer
100:1, fCLK to Ratio Transitional
• 135µVRMS Total Wideband Noise
• THD or Better
• 100kHz Maximum fCUTOFF Frequency
• Operates up to ±8V Power Supplies
• Input Frequency Range up to 50 Times the Filter

Cutoff Frequency

U APPLICATIO S
• Antialiasing Filters
• Telecom Filters
• Sinewave Generators
, LTC and LT are registered trademarks of Linear Technology Corporation. LTCMOS is a trademark of Linear Technology Corporation.

DESCRIPTIO

The is an 8th order, clock sweepable Cauer lowpass switched capacitor filter. An external TTL or CMOS clock programs the value of the filter’s cutoff frequency. With Pin 10 at V+, the fCLK to fCUTOFF ratio is 50:1 the filter has a Cauer response and with compensation the passband ripple is ±0.1dB. The stopband attenuation is 80dB at 2 x fCUTOFF. Cutoff frequencies up to 100kHz can be achieved. With Pin 10 at the fCLK to ratio is 100:1, the filter has a transitional ButterworthCauer response with lower noise and lower delay nonlinearity than the Cauer response. The stopband attenuation at x is 92dB. Cutoff frequencies up to 50kHz can be achieved.

The LTC1064-4 features low noise and low harmonic distortion even when input voltages up to 3VRMS are applied. The LTC1064-4 overall performance competes with equivalent multiple op amp active realizations. The LTC1064-4 is pin compatible with the LTC1064-1, LTC1064-2 and LTC1064-3.

The LTC1064-4 is manufactured using Linear Technology’s enhanced LTCMOSTM silicon gate process.

TYPICAL APPLICATIO
8th Order Clock Sweepable Lowpass Elliptic Filter
8V 0.1µF

INV C R h, I
2 VIN

COMP2* 13
3 AGND

LTC1064-4
fCLK
11 CLOCK

TTL,
5 AGND
50/100 10
6 COMP1*
7 INV A
9 VOUT

VOUT
0.1µF
1064 TA01
* FOR FREQUENCIES ABOVE 20kHz AND MINIMUM PASSBAND RIPPLE REFER TO THE PIN DESCRIPTION SECTION FOR COMPENSATION GUIDELINES. NOTE:THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1µF CAPACITOR CLOSE TO THE PACKAGE. BYPASSING PIN 10 WITH 0.1µF CAPACITOR REDUCES CLOCK FEEDTHROUGH. THE CONNECTION BETWEEN PINS 7 AND 14 SHOULD BE PHYSICALLY DONE UNDER THE PACKAGE.

VOUT/VIN dB

Frequency Response
20 TA = 25°C
fCLK = 5MHz, 50:1 CCOMP1 = 30pF, CCOMP2 = 18pF
fCLK = 2MHz, 50:1
fCLK = 1MHz, 100:1
100k

FREQUENCY Hz
1064-4 TA01b

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Datasheet ID: LTC1064-4MJ 645745