LTC1064CS Linear Technology Corporation, LTC1064CS Datasheet

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LTC1064CS

Manufacturer Part Number
LTC1064CS
Description
Low noise, fast, quad universal filter building block
Manufacturer
Linear Technology Corporation
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1064CS
Manufacturer:
LT
Quantity:
8
Part Number:
LTC1064CSW
Manufacturer:
LT
Quantity:
252
APPLICATIONS
FEATURES
TYPICAL
R
Clock-Tunable 8th Order Cauer Lowpass Filter with f
FOR f
H2
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
Anti-Aliasing Filters
Wide Frequency Range Tracking Filters
Spectral Analysis
Loop Filters
(FROM
, R
CLK
V
8V
L2
IN
)
= 5MHz, ADD C1 = 10pF BETWEEN PINS 4, 1
22.1k
APPLICATION
18.25k
C2 = 10pF BETWEEN PINS 21, 24
C3 = 27pF BETWEEN PINS 9, 12
10.7k
49.9K
11.5K
0.1 F
10k
10k
U
10
11
12
1
2
3
4
5
6
7
8
9
INV B
HPB/NB
BPB
LPB
SB
AGND
V
SA
LPA
BPA
HPA/NA
INV A
+
LTC1064
U
HPC/NC
50/100
INV C
INV D
BPD
HPD
BPC
LPC
CLK
LPD
SC
V
WIDEBAND NOISE 140 V
24
23
22
21
20
19
18
17
16
15
14
13
5MHz
8V
CUTOFF
12.1k
17.4k
41.2k
12.7k
66.5k
121k
10k
14k
10k
13k
up to 100kHz
26.7k
102k
R
R
0.1 F
H2
L2
Universal Filter Building Block
RMS
DESCRIPTION
The LTC
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, Bessel and Chebyshev) can be formed.
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.
The LTC1064 is manufactured using Linear Technology’s
enhanced LTCMOS
LTCMOS is a trademark of Linear Technology Corporation.
1064 TA01
PIN 12
–8V
V
, LTC and LT are registered trademarks of Linear Technology Corporation.
OUT
®
Low Noise, Fast, Quad
1064 consists of four high speed, low noise
–105
–120
–135
–15
–30
–45
–60
–75
–90
0
1k
TM
U
silicon gate process.
RIPPLE = 0.1dB
RIPPLE = 0.05dB
f
CLK
Gain vs Frequency
INPUT FREQUENCY (Hz)
f
CLK
= 5MHz
10k
= 1MHz
100k
LTC1064
1064 TA02
1M
1

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LTC1064CS Summary of contents

Page 1

... Consult LTC Marketing for details. The LTC1064 is manufactured using Linear Technology’s enhanced LTCMOS , LTC and LT are registered trademarks of Linear Technology Corporation. LTCMOS is a trademark of Linear Technology Corporation 100kHz CUTOFF 13k 66 ...

Page 2

... CONDITIONS ORDER PART TOP VIEW NUMBER INV HPC/NC 22 BPC LTC1064CS 21 LPC 20 SC – CLK 17 50/100 16 LPD BPD 15 14 HPD 13 INV D SW PACKAGE = 100 MIN TYP MAX 2.375 8 3 ...

Page 3

ELECTRICAL CHARACTERISTICS (Complete Filter 5V TTL clock input level, unless otherwise specified PARAMETER Center Frequency Range Input Frequency Range Clock-to-Center Frequency LTC1064 Ratio LTC1064A (Note 1) CLK O ...

Page 4

LTC1064 W BLOCK DIAGRA INV A – (12) AGND + (6) INV B – (1) + INV C – (24) + INV D – (13 TYPICAL PERFORMANCE CHARACTERISTICS Mode 50:1 CLK O ...

Page 5

W U TYPICAL PERFORMANCE CHARACTERISTICS Mode 25:1 CLK 7. PIN (R2/R4 ...

Page 6

LTC1064 PIN FUNCTIONS + – (Pins 7, 19): Power Supplies. They should be bypassed with a 0.1 F ceramic capacitor. Low noise, nonswitching power supplies are recommended. The de- vice operates with a single ...

Page 7

U U APPLICATIONS INFORMATION ANALOG CONSIDERATIONS Grounding and Bypassing 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. + Pin ...

Page 8

LTC1064 U U APPLICATIONS INFORMATION Offset Nulling 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. The circuit shown ...

Page 9

W ODES OF OPERATIO Mode 3 Mode 3 is the second of the primary modes. In Mode 3, the ratio of the external clock frequency to the center fre- quency of each 2nd order section can be adjusted above or ...

Page 10

LTC1064 W ODES OF OPERATIO – 1/4 LTC1064 AGND Figure 8. Mode 2: 2nd Order Filter Providing Notch, Bandpass and Lowpass Mode 3a This is an extension of Mode 3 where ...

Page 11

U TYPICAL APPLICATIONS Wideband Bandpass: Ratio of High to Low Corner Frequency Equal INV B R23 2 HPB/NB R33 3 BPB R43 4 LPB AGND LTC1064 0.1 ...

Page 12

LTC1064 U TYPICAL APPLICATIONS 8th Order Bandpass Filter with 2 Stopband Notches R12 1 INV B R22 2 HPB/NB R32 3 BPB R42 4 LPB AGND LTC1064 0 ...

Page 13

U TYPICAL APPLICATIONS 8th Order Chebyshev Lowpass Filter with a Passband Ripple of 0.1dB and Cutoff Frequency up to 100kHz 1 INV B R22 2 HPB/NB R32 3 BPB R12 R42 4 LPB AGND LTC1064 7 + ...

Page 14

LTC1064 U TYPICAL APPLICATIONS Dual 4th Order Bessel Filter with 140kHz Cutoff Frequency R12 1 INV B INV C V IN1 R22 2 HPB/NB HPC/NC R32 3 BPB BPC R42 4 LPB LPC AGND LTC1064 7 + ...

Page 15

... High Speed, Quad Universal Building Block 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- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 16

... LT/GP 0895 2K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1989 0.200 (5.080) MAX J24 0695 0.065 (1.651) TYP N24 0695 SW24 0695 ...

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