LTC1064-1_09 [Linear]
Low Noise, 8th Order, Clock Sweepable Elliptic Lowpass Filter; 低噪声， 8阶，时钟扫频椭圆低通滤波器
| 型号： | LTC1064-1_09 |
| 厂家： | 
Linear |
| 描述： | Low Noise, 8th Order, Clock Sweepable Elliptic Lowpass Filter |
| 文件： | 总8页 (文件大小：171K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1064-1
Low Noise, 8th Order, Clock
Sweepable Elliptic Lowpass Filter
U
FEATURES
DESCRIPTIO
■
The LTC®1064-1 is an 8th order, clock sweepable elliptic
(Cauer) lowpass switched capacitor filter. The passband
ripple is typically ±0.15dB, and the stopband attenuation
at 1.5 times the cutoff frequency is 68dB or more.
8th Order Filter in a 14-Pin Package
■
■
■
■
■
■
■
No External Components
100:1 Clock to Center Ratio
150µVRMS Total Wideband Noise
0.03% THD or Better
50kHz Maximum Corner Frequency
Operates from ±2.37V to ±8V Power Supplies
Passband Ripple Guaranteed Over Full Military
Temperature Range
An external TTL or CMOS clock programs the value of the
filter’scutofffrequency.Theclocktocutofffrequencyratio
is 100:1.
Noexternalcomponentsareneededforcutofffrequencies
up to 20kHz. For cutoff frequencies over 20kHz two low
valuecapacitorsarerequiredtomaintainpassbandflatness.
The LTC1064-1 features low wideband noise and low
harmonic distortion even for input voltages up to 3VRMS
InfacttheLTC1064-1overallperformancecompleteswith
equivalent multiple op amp RC active realizations.
U
APPLICATIO S
.
■
Antialiasing Filters
Telecom PCM Filters
■
The LTC1064-1 is available in a 14-pin DIP or 16-pin
surface mounted SW package.
The LTC1064-1 is pin compatible with the LTC1064-2.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
8th Order Clock Sweepable Lowpass
Elliptic Antialiasing Filter
Frequency Response
15
1
2
3
4
5
6
7
14
13
12
11
10
9
R(h, I)
INV C
0
–15
–30
–45
–60
–75
–90
–105
V
COMP2*
V
IN
IN
–
–8V
V
AGND
LTC1064-1
0.1µF
+
CLOCK
f
V
8V
CLK
(TTL, ≤5MHz)
0.1µF
NC
AGND
V
COMP1*
INV A
V
OUT
OUT
8
NC
1064 TA01
20
FREQUENCY (kHz)
0
5
10 15
25 30 35 40
NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED BY A 0.1µF
CAPACITOR CLOSE TO THE PACKAGE.
1064 TA02
8th ORDER CLOCK SWEEPABLE LOWPASS ELLIPTIC ANTIALIASING
FILTER MAINTAINS, FOR 0.1Hz ≤ f ≤ 10kHz, A ±0.15dB PASSBAND
FOR SERVO OFFSET NULLING APPLICATIONS, PIN 1 IS THE 2ND
STAGE SUMMING JUNCTION.
*FOR CUTOFF FREQUENCY ABOVE 20kHz, USE COMPENSATION
CAPACITORS (5pF TO 56pF) BETWEEN PIN 13 AND PIN 1
AND PIN 6 AND PIN 7.
CUTOFF
RIPPLE AND 72dB STOPBAND ATTENUATION AT 1.5 × f
.
CUTOFF
TOTAL WIDEBAND NOISE = 150µV
, THD = 0.03% FOR V = 1V
RMS IN RMS
10641fa
1
LTC1064-1
W W
U W
ABSOLUTE AXI U RATI GS
(Note 1)
Total Supply Voltage (V+ to V–)............................ 16.5V
Power Dissipation.............................................. 400mW
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Operating Temperature Range
LTC1064-1M (OBSOLETE) ............... –55°C to 125°C
LTC1064-1C/AC.................................. –40°C to 85°C
U
W
U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ORDER PART
NUMBER
ORDER PART
NUMBER
1
2
3
4
5
6
7
R(h, l)
14
13
12
11
10
9
TOP VIEW
INV C
COMP2
V
IN
1
2
3
4
5
6
7
8
INV C
16 R(h, l)
–
V
AGND
LTC1064-1CN
LTC1064-1ACN
LTC1064-1CSW
15 COMP2
–
V
IN
+
f
V
CLK
14
13
12
11
10
9
V
AGND
NC
AGND
COMP1
INV A
+
V
NC
V
OUT
AGND
NC
f
CLK
NC
8
NC
NC
COMP1
INV A
N PACKAGE
14-LEAD PDIP
V
OUT
TJMAX = 110°C, θJA = 70°C/W
J PACKAGE
SW PACKAGE
14-LEAD CERDIP
16-LEAD PLASTIC (WIDE) SO
LTC1064-1MJ
LTC1064-1CJ
TJMAX = 150°C, θJA = 90°C/W
OBSOLETE PACKAGE
Consider the N14 Package for Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ■ denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VS = ±7.5V, fCLK = 1MHz, R1 = 10k, C1 = 10pF, TTL or CMOS clock input
level unless otherwise specified.
PARAMETER
CONDITIONS
MIN
TYP
±0.1
MAX
UNITS
dB
Passband Gain, LTC1064-1, 1A
Gain TempCo
Referenced to 0dB, 1Hz to 0.1f
■
±0.35
C
0.0002
10 ± 1%
dB/°C
kHz
Passband Edge Frequency, f
C
Gain at f
Referenced to Passband Gain
C
LTC1064-1
LTC1064-1A
■
■
–1.25
– 0.75
0.85
0.65
dB
dB
–3dB Frequency
10.7
kHz
Passband Ripple (Note 1)
LTC1064-1
0.1f to 0.85f Referenced to Passband Gain,
C C
Measured at 6.25kHz and 8.5kHz
■
■
±0.15
±0.1
±0.32
±0.19
dB
dB
LTC1064-1A
Ripple TempCo
0.0004
dB/°C
Stopband Attenuation
LTC1064-1
At 1.5f Referenced to 0dB
C
■
■
66
68
72
72
dB
dB
LTC1064-1A
Stopband Attenuation
LTC1064-1
At 2f Referenced to 0dB
C
■
■
67
68
72
72
dB
dB
LTC1064-1A
10641fa
2
LTC1064-1
The ■ denotes the specifications which apply over the full operating
ELECTRICAL CHARACTERISTICS
level unless otherwise specified.
temperature range, otherwise specifications are at TA = 25°C. VS = ±7.5V, fCLK = 1MHz, R1 = 10k, C1 = 10pF, TTL or CMOS clock input
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Frequency Range
0
f
/2
CLK
kHz
Output Voltage Swing and
Operating Input Voltage Range
V = ±2.37V
■
■
■
±1
±3
±5
V
V
V
S
V = ±5V
S
V = ±7.5V
S
Total Harmonic Distortion
Wideband Noise
V = ±5V, Input = 1V
V = ±7.5V, Input = 3V
S
at 1kHz
RMS
0.015
0.03
%
%
S
at 1kHz
RMS
V = ±5V, Input = GND 1Hz to 999kHz
150
165
µV
µV
S
RMS
RMS
V = ±7.5V, Input = GND 1Hz to 999kHz
S
Output DC Offset
LTC1064-1
V = ±7.5V, Pin 2 Grounded
S
50
50
175
125
mV
mV
LTC1064-1A
Output DC Offset TempCo
V = ±5V
S
–100
µV/°C
Input Impedance
10
20
2
kΩ
Output Impedance
f
= 10kHz
Ω
OUT
Output Short-Circuit Current
Clock Feedthrough
Source/Sink
3/1
200
mA
µV
RMS
Maximum Clock Frequency
Power Supply Current
50% Duty Cycle, V = ±7.5V
5
MHz
S
V = ±2.37V
S
■
■
10
12
22
mA
V = ±5V
S
23
26
mA
mA
V = ±7.5V, f
S
= 1MHz
CLK
16
28
32
mA
mA
■
■
Power Supply Voltage Range
±2.37
±8
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
Note 2: For tighter specifications please contact LTC Marketing.
of a device may be impaired.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Gain vs Frequency
Phase vs Frequency
Group Delay
15
0
0
–45
500
450
400
350
300
250
200
150
100
50
V
T
= ±5V
V
T
= ±5V
S
A
S
A
= 25°C
= 25°C
f
f
= 1MHz
f
f
= 1MHz
= 10kHz
CLK
= 10kHz
C
CLK
C
–90
–15
–30
–45
–60
–75
–90
–105
–135
–180
–225
–270
–315
–360
–405
–450
V
= ±5V
S
A
T
= 25°C
f
f
f
= 1MHz
CLK
C
–3dB
= 10kHz ± 0.1dB
= 10.7kHz
0
1
10
FREQUENCY (kHz)
100
0
1
2
3
4
5
6
7
8
9 10 11
4
0
1
2
3
5
6
7
8
9
10 11 12
1064 G03
FREQUENCY (kHz)
FREQUENCY (kHz)
1064 G01
1064 G02
10641fa
3
LTC1064-1
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Gain vs Frequency
Gain vs Frequency
Gain vs Frequency
15
0
5
0
15
0
25°C GAIN PEAK =
f
= 3MHz, f = 30kHz
0.4dB AT 30kHz
–15
–30
–45
–60
–75
–90
–105
–5
–15
–30
–45
–60
–75
–90
–105
CLK
C
f
= 2MHz, f = 20kHz
C
CLK
COMP1 = 10pF
COMP1 NOT USED,
COMP2 = 20pF
COMP2 = 15pF
–10
–15
–20
–25
–30
–35
f
= 4MHz, f = 40kHz
C
CLK
f
= 3MHz, f = 30kHz
C
CLK
COMP1 = 20pF
COMP2 = 30pF
COMP1 = 24pF
COMP2 = 36pF
f
= 5MHz, f = 50kHz
C
f
= 4MHz, f = 40kHz
CLK
CLK
C
V
f
C
= ±7.5V
CLK
= 50kHz
COMP1 = 30pF
COMP2 = 47pF
S
COMP1 = 36pF
= 5MHz
COMP2 = 47pF
125°C GAIN PEAK =
f
1dB AT 35kHz
V
T
= ±5V
= 25°C
V
T
= ±7.5V
= 25°C
S
A
S
A
COMP1 = 33pF
COMP2 = 56pF
1
10
100
1
10
100
1
10
100
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
1064 G04
1064 G06
1064 G05
Typical Wideband Noise
Total Harmonic Distortion
(151µVRMS) VS = ±5V, TA = 25°C
fCLK = 1MHz, fC = 10kHz Input
Grounded
(0.025%) VS = ±7.5V, TA = 25°C
fCLK = 1MHz, fC = 10kHz
Input = 1kHz at 3VRMS
Power Supply Current vs Power
Supply Voltage
48
44
40
36
32
28
24
20
16
12
8
f
= 1MHz
CLK
T
= –55°C
= 25°C
= 125°C
A
T
A
A
T
4
0
0
2
4
6
8
10 12 14 16 18 20 22 24
TOTAL POWER SUPPLY VOLTAGE (V)
1064 G09
U
U
U
PI FU CTIO S
(Pin Numbers Refer to the 14-Pin Package)
COMP1, INV A, COMP2, INV C (Pins 1,6,7, and 13): For
filter cutoff frequencies higher than 20kHz, in order to
minimize the passband ripple, compensation capacitors
should be added between Pin 6 and Pin 7 (COMP1) and
Pin1andPin13(COMP2).ForCOMP1(COMP2),add1pF
(1.5pF) mica capacitor for each kHz increase in cutoff
frequency above 20kHz. For more detail refer to Gain vs
Frequency graphs.
is protected against static discharge. The device’s output,
Pin9,istheoutputofanopampwhichcantypicallysource/
sink 3mA/1mA. Although the internal op amps are unity
gain stable, driving long coax cables is not recommended.
When testing the device for noise and distortion, the
output, Pin 9, should be buffered (Figure 4). The op amp
power supply wire (or trace) should be connected
directly to the power source.
VIN, VOUT (Pins 2, 9): The input Pin 2 is connected to an
18k resistor tied to the inverting input of an op amp. Pin 2
AGND (Pins 3, 5): For dual supply operation these pins
should be connected to a ground plane. For single supply
10641fa
4
LTC1064-1
U
U
U
PI FU CTIO S (Pin Numbers Refer to the 14-Pin Package)
operation both pins should be tied to one half supply
(Figure 2). Also Pin 8 and Pin 10, although they are not
internally connected should be tied to analog ground or
system ground. This improves the clock feedthrough
performance.
breadboard,useaoneinch,orless,shieldedcoaxialcable;
the shield should be grounded. In a PC board, use a one
inch trace or less; surround the trace by a ground plane.
NC (Pins 8, 10): The “no connection” pins preferably
should be grounded.
V+, V– (Pins 4, 12): The V+ and V– pins should be
bypassed with a 0.1µF capacitor to an adequate analog
ground. Low noise, nonswitching power supplies are
recommended. To avoid latchup when the power supplies
exhibit high turn-on transients, a 1N5817 Schottky diode
should be added from the V+ and V– pins to ground
(Figure 1).
f
CLK (Pin 11): 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 temperature
range. The recommended duty cycle of the input clock is
50% although for clock frequencies below 500kHz the
clock “on” time can be as low as 200ns. The maximum
clock frequency for ±5V supplies is 4MHz. For ±7V sup-
plies and above, the maximum clock frequency is 5MHz.
Donotallowtheclocklevelstoexceedthepowersupplies.
For clock level shifting (see Figure 3).
INV A, R(h, I) (Pins 7, 14): A very short connection
between Pin 14 and Pin 7 is recommended. This connec-
tion should be preferably done under the IC package. In a
U
TYPICAL APPLICATIO S
1
1
14
14
R(h, I)
R(h, I)
INV C
INV C
2
3
4
5
6
7
2
3
4
5
6
7
13
12
11
10
9
13
12
11
10
9
V
COMP2*
V
IN
V
COMP2*
V
IN
IN
IN
–
–
–
V
V
AGND
AGND
V
LTC1064-1
LTC1064-1
0.1µF
1N5817
+
+
+
+
V = 15V
f
0V TO 10V
f
V
V
V
CLK
CLK
0.1µF
0.1µF
1N5817
0.1µF
NC
NC
AGND
AGND
5k
V
V
COMP1*
INV A
V
COMP1*
INV A
V
OUT
OUT
OUT
OUT
+
V /2
8
8
5k
NC
NC
1064 F01
1064 F02
Figure 1. Using Schottky Diodes to Protect
the IC from Power Supply Spikes
Figure 2. Single Supply Operation. If Fast Power Up
or Down Transients are Expected, Use a 1N5817
Schottky Diode Between Pin 4 and Pin 5.
POWER SOURCE
1
2
3
4
5
6
7
14
13
12
11
10
9
R(h, I)
+
–
INV C
V
V
1
2
3
4
5
6
7
14
13
12
11
10
9
R(h, I)
INV C
V
IN
V
IN
COMP2*
+
V
COMP2*
V
V
IN
+
IN
–
V
AGND
LTC1064-1
–
0.1µF
V
AGND
2.2k
+
f
V
CLK
LTC1064-1
2
0.1µF
10k
T L
+
0.1µF
f
V
V
CLK
LEVEL
NC
AGND
1µF
5k
10k
NC
AGND
5k
V
OUT
COMP1*
INV A
–
+
V
COMP1*
INV A
V
OUT
8
OUT
V
OUT
NC
8
5k
0.1µF
NC
1064 F04
RECOMMENDED OP AMPS:
LT1022, LT318, LT1056
0.1µF
1064 F03
Figure 3. Level Shifting the Input T2L Clock
for Single Supply Operation, V+ >6V.
Figure 4. Buffering the Filter Output. The Buffer Op Amp
Should Not Share the LTC1064-1 Power Lines.
10641fa
5
LTC1064-1
U
TYPICAL APPLICATIO S
Transitional Elliptic-Bessel Dual 5th Order Lowpass Filter
C
Amplitude Response
15
0
f
f
= 5kHz
–3dB
CLK
= 1MHz
47.5k
–15
–30
–45
–60
–75
–90
–105
1
2
3
4
5
6
7
14
13
12
11
10
9
R(h, I)
INV C
–
V
V
OUT1
OUT2
LT1056
V
OUT1
COMP2*
V
V
–
IN
IN1
V
+
–
V
AGND
LTC1064-1
f
= 200
–3dB
0.1µF
CLK
× f
+
+
f
V
V
CLK
0.1µF
NC
AGND
V
COMP1*
INV A
V
OUT
OUT2
1
10
(kHz)
100
C
8
5
NC
f
C =
(µF)
IN
f
–3dB
1064 TA09
1064 TA06
47.5k
IN2
OUTPUT1 WIDEBAND NOISE: 50µV
RMS
OUTPUT2 WIDEBAND NOISE: 110µV
RMS
V
Transient Response to a 2V Step
Input VOUT2
Transient Response to a 2V Step
Input VOUT1
1V/DIV
1V/DIV
0.1ms/DIV
0.1ms/DIV
Adding an Output Buffer-Filter to Eliminate Any Clock Feedthrough
Over a 10:1 Clock Range, for fCLK = 2kHz to 20kHz
1
2
3
4
5
6
7
14
13
12
11
10
9
R(h, I)
INV C
V
COMP2*
V
IN
IN
–
V
–
V
AGND
10k
LTC1064-1
0.1µF
V
OUT
+
+
f
V
V
CLK
200pF
0.1µF
NC
AGND
4.99k
4.99k
V
OUT
COMP1*
INV A
–
+
50Ω
8
LT1056
NC
430pF
0.027µF
1064 TA10
10641fa
6
LTC1064-1
U
PACKAGE DESCRIPTIO
J Package
14-Lead CERDIP (Narrow 0.300, Hermetic)
(LTC DWG # 05-08-1110)
.200
(5.080)
MAX
.300 BSC
(7.62 BSC)
.785
(19.939)
MAX
.005
(0.127)
.015 – .060
(0.381 – 1.524)
MIN
14
13
12
11
10
9
8
.220 – .310
(5.588 – 7.874)
.025
(0.635)
RAD TYP
.008 – .018
0° – 15°
(0.203 – 0.457)
.045 – .065
(1.143 – 1.651)
.100
(2.54)
BSC
.125
(3.175)
MIN
2
3
4
5
6
1
7
.014 – .026
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
(0.360 – 0.660)
J14 0801
OBSOLETE PACKAGE
N Package
14-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
.770*
(19.558)
MAX
.300 – .325
(7.620 – 8.255)
.045 – .065
(1.143 – 1.651)
.130 ± .005
(3.302 ± 0.127)
14
13
12
11
10
9
8
7
.020
(0.508)
MIN
.065
(1.651)
TYP
.008 – .015
(0.203 – 0.381)
.255 ± .015*
(6.477 ± 0.381)
+.035
–.015
.325
.005
(0.125)
MIN
.120
(3.048)
MIN
.018 ± .003
(0.457 ± 0.076)
.100
(2.54)
BSC
+0.889
8.255
1
2
3
5
6
4
(
)
–0.381
NOTE:
INCHES
1. DIMENSIONS ARE
N14 1002
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
SW Package
16-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
.050 BSC .045 ±.005
.030 ±.005
.398 – .413
(10.109 – 10.490)
NOTE 4
TYP
15 14
12
10
9
N
16
N
13
11
.325 ±.005
.420
MIN
.394 – .419
(10.007 – 10.643)
NOTE 3
NOTE:
1. DIMENSIONS IN
N/2
8
1
2
3
N/2
INCHES
(MILLIMETERS)
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
RECOMMENDED SOLDER PAD LAYOUT
2
3
5
7
1
4
6
.291 – .299
(7.391 – 7.595)
NOTE 4
.037 – .045
(0.940 – 1.143)
.093 – .104
(2.362 – 2.642)
.010 – .029
(0.254 – 0.737)
× 45°
.005
(0.127)
4. THESE DIMENSIONS DO NOT
INCLUDE MOLD FLASH OR
PROTRUSIONS. MOLD FLASH OR
PROTRUSIONS SHALL NOT
EXCEED .006" (0.15mm)
RAD MIN
0° – 8° TYP
.050
(1.270)
BSC
.004 – .012
(0.102 – 0.305)
.009 – .013
(0.229 – 0.330)
NOTE 3
.014 – .019
(0.356 – 0.482)
TYP
.016 – .050
S16 (WIDE) 0502
(0.406 – 1.270)
10641fa
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.
7
LTC1064-1
U
TYPICAL APPLICATIO
Transitional Elliptic-Bessel 10th Order Lowpass Filter
C
47.5k
1
2
3
4
5
6
7
14
13
12
11
10
9
R(h, I)
INV C
–
+
LT1056
V
OUT
COMP2*
V
IN
–
V
–
V
AGND
LTC1064-1
0.1µF
f
= 250
–3dB
+
CLK
+
f
V
V
CLK
× f
0.1µF
NC
AGND
V
OUT
COMP1*
INV A
C
8
NC
3
C =
(µF)
47.5k
V
f
–3dB
1064 TA03
OUTPUT WIDEBAND NOISE:110µV
IN
RMS
Amplitude Response
15
0
f
f
= 3kHz
Transient Response to a 2V Step Input
–3dB
CLK
= 750kHz
–15
–30
–45
–60
–75
–90
–105
1V/DIV
0.1ms/DIV
1
10
100
f
(kHz)
IN
1064 TA05
RELATED PARTS
PART NUMBER
LTC1069-1
LTC1069-6
LTC1569-6
LTC1569-7
DESCRIPTION
COMMENTS
8th Order Elliptic Lowpass
S0-8 Package, Low Power
Single Supply, 8th Order Elliptic Lowpass
DC Accurate, 10th Order, Lowpass
DC Accurate, 10th Order, Lowpass
S0-8 Package, Very Low Power
Internal Precision Clock, Low Power
Internal Precision Clock, S0-8 Package
10641fa
LW/TP 1202 1K REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
8
■
■
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
LINEAR TECHNOLOGY CORPORATION 1989
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