Linear Technology LTC1064, LTC1064ACJ, LTC1064MJ, LTC1064CS, LTC1064CN Datasheet

LTC1064

Low Noise, Fast, Quad

Universal Filter Building Block

FEATURES

■Four Filters in a 0.3-Inch Wide Package

■One Half the Noise of the LTC1059/LTC1060/ LTC1061 Devices

■Maximum Center Frequency: 140kHz

■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

■Customized Version with Internal Resistors Available

APPLICATIOUS

■Anti-Aliasing Filters

■Wide Frequency Range Tracking Filters

■Spectral Analysis

■Loop Filters

DESCRIPTIOU

The LTC®1064 consists of four high speed, low noise switched-capacitor filter building blocks. Each filter building 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 frequency 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, Bessel and Chebyshev) can be formed.

A customized monolithic version of the LTC1064 including internal thin film resistors can be obtained for high volume applications. Consult LTC Marketing for details.

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

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

LTCMOS is a trademark of Linear Technology Corporation.

TYPICAL APPLICATIOU

Clock-Tunable 8th Order Cauer Lowpass Filter with fCUTOFF up to 100kHz

							13k
							66.5k	RH2
								102k
22.1k	1					24		PIN 12
VIN		INV B		INV C			10k
10k	2	HPB/NB		HPC/NC		23
18.25k							12.1k			0
	3					22
		BPB		BPC
10.7k							17.4k			–15
	4					21		RL2
		LPB		LPC
								26.7k		–30
	5					20
		SB		SC					(dB)	–45
	6					19
		AGND		V	–			–8V		–60
8V	7					18	5MHz		GAIN
		V+		CLK				0.1μF		–75
			LTC1064
0.1μF	8	SA		50/100		17	8V			–90
10k								VOUT
	9	LPA		LPD		16				–105
49.9K							41.2k
	10	BPA		BPD		15				–120
11.5K							12.7k
	11	HPA/NA		HPD		14				–135
							14k
(FROM	12	INV A		INV D		13				1k
RH2, RL2)							121k
							10k
FOR fCLK = 5MHz, ADD C1 = 10pF BETWEEN PINS 4, 1						WIDEBAND NOISE 140μVRMS
C2 = 10pF BETWEEN PINS 21, 24
C3 = 27pF BETWEEN PINS 9, 12								1064 TA01

Gain vs Frequency

fCLK = 5MHz RIPPLE = ±0.1dB

fCLK = 1MHz RIPPLE = ±0.05dB

10k 100k 1M INPUT FREQUENCY (Hz)

1064 TA02

1

LTC1064

ABSOLUTE WAXIWUW RATINGSU

Total Supply Voltage (V + to V –)	............................. 16V
Power Dissipation.............................................	500mW
Operating Temperature Range	– 40 ° C to 85°C
LTC1064AC/LTC1064C....................
LTC1064AM/LTC1064M ................	– 55 ° C to 125°C

Storage Temperature Range ................	– 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................	300°C

PACKAGE/ORDER IUFORWATIOU

			TOP VIEW
INV B					INV C
		1		24
HPB/NB					HPC/NC
		2		23
BPB		3		22	BPC
LPB		4		21	LPC
SB		5		20	SC
					V–
AGND		6		19
V+
		7		18	CLK
SA		8		17	50/100
LPA
		9		16	LPD
BPA					BPD
		10		15
HPA/NA
		11		14	HPD
INV A					INV D
		12		13

J PACKAGE		N PACKAGE
24-LEAD CERAMIC DIP	24-LEAD PLASTIC DIP
TJMAX = 150°C, θJA =		100°C/ W (J)
TJMAX = 110°C, θJA =		65°C/ W (N)

ORDER PART

NUMBER

LTC1064ACJ

LTC1064CJ

LTC1064AMJ

LTC1064MJ

LTC1064ACN

LTC1064CN

				TOP VIEW
INV B						INV C
		1			24
HPB/NB						HPC/NC
		2			23
BPB		3			22	BPC
LPB		4			21	LPC
SB		5			20	SC
						V–
AGND		6			19
V+
		7			18	CLK
SA		8			17	50/100
LPA
		9			16	LPD
BPA						BPD
		10			15
HPA/NA
		11			14	HPD
INV A						INV D
		12			13

SW PACKAGE

24-LEAD PLASTIC SO

TJMAX = 100°C, θJA = 85°C/ W

ORDER PART

NUMBER

LTC1064CS

Consult factory for Industrial grade parts.

ELECTRICAL CHARACTERISTICS

(Internal Op Amps) TA = 25°C, unless otherwise specified.

PARAMETER	CONDITIONS		MIN	TYP	MAX	UNITS
Operating Supply Voltage Range			±2.375		±8	V
Voltage Swings	VS = ±5V, RL = 5k		±3.2	±3.6		V
		●	±3.1			V
Output Short-Circuit Current (Source/Sink)	VS = ±5V			3		mA
DC Open-Loop Gain	VS = ±5V, RL = 5k			80		dB
GBW Product	VS = ±5V			7		MHz
Slew Rate	VS = ±5V			10		V/μs

2

LTC1064

ELECTRICAL CHARACTERISTICS

(Complete Filter) VS = ±5V, TA = 25°C, TTL clock input level, unless otherwise specified.

PARAMETER		CONDITIONS			MIN	TYP	MAX	UNITS
Center Frequency Range, fO		VS = ±8V, Q £ 3				0.1 to 140		kHz
Input Frequency Range						0 to 1		MHz
Clock-to-Center Frequency	LTC1064	fCLK = 1MHz, fO = 20kHz, Pin 17 High				50 ± 0.3	50 ± 0.8	%
Ratio, fCLK/fO	LTC1064A (Note 1)	Sides A, B, C: Mode 1,		●				%
		R1 = R3 = 5k, R2 = 5k, Q = 10,					50 ± 0.9	%
		Sides D: Mode 3, R1 = R3 = 50k		●
		R2 = R4 = 5k
	LTC1064	Same as Above, Pin 17 Low, fCLK = 1MHz				100 ± 0.3		%
	LTC1064A (Note 1)	fO = 10kHz					100 ± 0.8
		Sides A, B, C		●				%
		Side D		●			100 ± 0.9
Clock-to-Center Frequency	LTC1064	fCLK = 1MHz				0.4		%
Ratio, Side-to-Side Matching	LTC1064A (Note 1)			●			1	%
Clock-to-Center Frequency	LTC1064	fCLK = 4MHz, fO = 80kHz, Pin 17 High				50 ± 0.6		%
Ratio, fCLK/fO (Note 2)	LTC1064A (Note 1)	Sides A, B, C: Mode 1, VS = ±7.5V					50 ± 1.3	%
		R1 = R3 = 50k, R2 = 5k, Q = 5
		Side D: Mode 3, R1 = R3 = 50k
		R2 = R4 = 5k, fCLK = 4MHz
	LTC1064	Same as Above, Pin 17 Low				100 ± 0.6	100 ± 1.3	%
	LTC1064 A (Note 1)	fCLK = 4MHz, fO = 40kHz						%
Q Accuracy		Sides A, B, C: Mode 1, Q = 10		●		±2	6	%
		Side D: Mode 3, fCLK = 1MHz		●		±3	8	%
fO Temperature Coefficient		Mode 1, 50:1, fCLK < 2MHz				±1		ppm/°C
Q Temperature Coefficient		Mode 1, 100:1, fCLK < 2MHz				±5		ppm/°C
		Mode 3, fCLK < 2MHz				±5		ppm/°C
DC Offset Voltage	VOS1 (Table 1)	fCLK = 1MHz, 50:1 or 100:1		●		2	15	mV
	VOS2 (Table 1)	fCLK = 1MHz, 50:1 or 100:1		●		3	45	mV
	VOS3 (Table 1)	fCLK = 1MHz, 50:1 or 100:1		●		3	45	mV
Clock Feedthrough		fCLK < 1MHz				0.2		mVRMS
Maximum Clock Frequency		Mode 1, Q < 5, VS ³ ±5V				7		MHz
Power Supply Current					9	12	23	mA
				●			26	mA
The ● denotes specifications which apply over the full operating			Note 1: Contact LTC Marketing.
temperature range.			Note 2: Not tested, guaranteed by Design.

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

		VOSN	VOSBP	VOSLP
MODE	PINS 2, 11, 14, 23		PINS 3, 10, 15, 22	PINS 4, 9, 16, 21
1	VOS1 [(1/Q) + 1	+ ½½HOLP½½] – VOS3/Q	VOS3	VOSN – VOS2
1b	VOS1 [(1/Q) + 1	+ (R2/R1)] – VOS3/Q	VOS3	~(VOSN – VOS2)[1 + (R5/R6)]
2	VOS1 [(1 + (R2/R1) + (R2/R3) + (R2/R4) – VOS3(R2/R3)]		VOS3	VOSN – VOS2
	´ [R4/(R2 + R4)] + VOS2[R2/(R2 + R4)]
3	VOS2		VOS3	VOS1[1 + (R4/R1) + (R4/R2) + (R4/R3)]
				– VOS2(R4/R2) – VOS3(R4/R3)

3

LTC1064

BLOCK DIAGRAW

HPA/NA

BPA

LPA

(11)

(10)

(9)

INV A

–

(12)

+

S

+ ò

+ ò

AGND

+

–

(6)

HPB/NB

BPB

LPB

(2)

(3)

(4)

SA

INV B

(8)

(1)

–

+

S

+ ò

+ ò

+

HPC/NC

–

BPC

LPC

(23)

(22)

(21)

SB

INV C

(5)

–

(24)

+

S

+ ò

+ ò

+

HPD

–

BPD

LPD

(14)

(15)

(16)

SC

INV D

(20)

–

(13)

+ ò

+ ò

+

V+ (7)

50/100 (17)

CLK (18)

V – (19)

BY TYING PIN 17 TO V +, ALL SECTIONS OPERATE WITH (fCLK/fO) = 50:1.

BY TYING PIN 17 TO V –, ALL SECTIONS OPERATE WITH (fCLK/fO) = 100:1.

BY TYING PIN 17 TO AGND, SECTIONS B, C

OPERATE WITH (fCLK/fO) = 50:1 AND SECTIONS A, D OPERATE AT 100:1.

1064 BD

TYPICAL PERFORWAUCE CHARACTERISTICS

CENTER FREQUENCY ERROR (%) Q ERROR (%)

	Mode 1, (fCLK/fO) = 50:1
					TA = 25°C
20							Q = 5
							Q = 10
15
													VS = ±5V
10
				VS = ±2.5V
5																	VS = ±7.5V
0

–5	TA = 25°C
		VS = ±7.5V
1.5	Q = 5 OR 10
		VS = ±5V
1.0	VS = ±2.5V
0.5
0

0 10 20 30 40 50 60 70 80 90 100110 120 CENTER FREQUENCY (kHz)

		Mode 1, (fCLK/fO) = 100:1												Mode 2, (fCLK/fO) = 25:1
											TA = 25°C											TA = 25°C
		20									Q = 5			20								Q = 10
											Q = 10											PIN 17 AT V+
	(%)	15		VS = ±5V									(%)	15								(R2/R4) = 3
		10					VS = ±7.5V							10	VS = ±2.5V
	ERROR												ERROR									CC = 15pF
																CC = 15pF
		5												5								VS = ±5V
	Q	0											Q	0
		–5	VS = ±2.5V											–5
										TA = 25°C
FREQUENCYCENTER	(%)ERROR	1.5					VS = ±5V			Q = 5 OR 10		FREQUENCYCENTER	(%)ERROR	1.5
			VS = ±2.5V
		1.0						VS = ±7.5V						1.0
		0.5												0.5			VS = ±2.5V					VS = ±5V
		0				40		60	70	80	90 100110 120			0
		0	10	20	30		50							0	10	20	30	40	50	60	70	80	90 100110 120
					CENTER FREQUENCY (kHz)												CENTER FREQUENCY (kHz)

1064 G01

1064 G02

1064 G03

4

LTC1064

TYPICAL PERFORWAUCE CHARACTERISTICS

	Mode 2, (fCLK/fO) = 25:1
			T	A =		25°		C
	20		VS = ±7.5V
			PIN 17 AT V+
(%)	15		(R2/R4) = 3
	10
ERROR								Q = 5									Q = 2
	5
							CC =		22pF								CC = 39pF
	0
Q
	–5
FREQUENCYCENTER (%)ERROR
	1.5
	1.0								Q =		5					Q =		2
	0.5
	0
							60 80 100120140160180 200
	0		20		40

CENTER FREQUENCY (kHz)

											1064 G04
		Mode 3, (fCLK/fO) = 50:1
			TA = 25°C
		20	CC = 15pF
			R2 = R4
		15
	(%)		VS = ±7.5V
		10									Q = 2
	ERROR
		5
		0									Q = 1
	Q
		–5
CENTER FREQUENCY	ERROR (%)	1.5	VS = ±2.5V							VS = ±7.5V
		1.0							VS =		±5V
		0.5
		0				40		60	70	80	90 100 110 120
		0	10	20	30		50
					CENTER FREQUENCY (kHz)

1064 G07

		Mode 2, (fCLK/fO) = 50:1													Mode 3, (fCLK/fO) = 50:1
												°												T	A	= 25°C
											TA = 25 C
		20					VS = ±5V				PIN 17 AT V–				20									CC = 5pF
			VS =	±	2.5V						(R2/R4) = 3								VS =		±5V			R2 = R4
	(%)	15										Q = 5		(%)	15											Q = 5
																VS = ±2.5V
		10										Q = 10			10											Q = 10
	ERROR	5					VS = ±7.5V							ERROR	5								VS = ±7.5V
		0													0
	Q													Q
		–5													–5
CENTER FREQUENCY	ERROR (%)	1.5						VS = ±5V					CENTER FREQUENCY	ERROR (%)	1.5						VS = ±5V
		1.0				VS = ±2.5V									1.0	VS =	±	2.5V							VS = ±7.5V
		0.5										VS = ±7.5V			0.5
		0													0					40		60	70	80	90 100110 120
		0	10	20		30	40	50	60	70	80	90 100110 120			0	10	20		30		50
						CENTER FREQUENCY (kHz)													CENTER FREQUENCY (kHz)
												1064 G05														1064 G06

		Mode 3, (fCLK/fO) = 100:1											Wideband Noise vs Q
													240
											TA = 25°C		220	ANY OUTPUT
		20									CC = 5pF	)	200	R3 = R1
			VS = ±2.5V								R2 = R4			ONE SECOND ORDER
		15				VS = ±5V						RMS 180
	ERROR (%) Q ERROR (%)										Q = 10			SECTION
		10										WIDEBAND NOISE (μV/	160	MODE 1 OR 3									±7.5V
														100:1 OR 50:1
		5				VS = ±7.5V							140										±5V
																							±2.5V
		0											120
		–5					VS = ±5V						100
			VS = ±2.5V										80
CENTER FREQUENCY
		1.5											60
		1.0						VS = ±7.5V					40
		0.5											20
		0				40		60	70	80	90 100110 120		0
		0	10	20	30		50						0	2	4	6	8	10	12	14	16	18	20	22	24
					CENTER FREQUENCY (kHz)														Q
											1064 G08													1064 G09

Power Supply Current vs

Supply Voltage

	48
	44
(mA)	40
	36
CURRENT
	32
	28
SUPPLY	24								–55°C
	20
									25°C
	16								125°C
POWER
	12
	8
	4
	0				8		12	14	16	18	20	22	24
	0	2	4	6		10
			POWER SUPPLY VOLTAGE (V+ – V–)

Harmonic Distortion, 8th Order LP Butterworth, fC = 20kHz, THD = 0.015% for 3VRMS Input

1064 G11

1064 G10

5