LTC1164-6CJ#PBF [Linear]
IC SWITCHED CAPACITOR FILTER, ELLIPTIC/BESSEL, LOWPASS, CDIP14, CERDIP-14, Active Filter;
| 型号： | LTC1164-6CJ#PBF |
| 厂家： | 
Linear |
| 描述： | IC SWITCHED CAPACITOR FILTER, ELLIPTIC/BESSEL, LOWPASS, CDIP14, CERDIP-14, Active Filter LTE CD 有源滤波器 |
| 文件： | 总12页 (文件大小：240K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1164-6
Low Power 8th Order
Pin Selectable Elliptic or
Linear Phase Lowpass Filter
U
FEATURES
DESCRIPTIO
The LTC®1164-6 is a monolithic 8th order elliptic lowpass
filter featuring clock-tunable cutoff frequency and low
power supply current. Low power operation is achieved
without compromising noise or distortion performance.
At ±5V supplies the LTC1164-6 uses only 4mA supply
■
8th Order Pin Selectable Elliptic or Bessel Filter
■
4mA Supply Current with ±5V Supplies
■
64dB Attenuation at 1.44 fCUTOFF (Elliptic Response)
■
fCUTOFF Up to 30kHz (50:1 fCLK to fCUTOFF Ratio)
■
110µVRMS Wideband Noise with ±5V Supplies
■
current while keeping wideband noise below 110µVRMS
.
Operates at Single 5V Supply with 1VRMS
With a single 5V supply, the LTC1164-6 can provide up to
10kHz cutoff frequency and 80dB signal-to-noise ratio
while consuming only 2.5mA.
Input Range
■
Operates Up to ±8V Supplies
■
TTL/CMOS Compatible Clock Input
■
No External Components
The LTC1164-6 provides an elliptic lowpass rolloff with
stopband attenuation of 64dB at 1.44 fCUTOFF and an fCLK
■
Available in 14-Pin Dip and 16-Pin SO Wide Packages
-
to-fCUTOFF ratioof100:1(Pin10toV–).Foraratioof100:1,
fCUTOFF can be clock-tuned up to 10kHz. For a fCLK-to-
fCUTOFF ratio of 50:1 (Pin 10 to V+), the LTC1164-6
provides an elliptic lowpass filter with fCUTOFF frequencies
up to 20kHz. When Pin 10 is connected to ground, the
LTC1164-6 approximates an 8th order linear phase re-
sponse with 65dB attenuation at 4.5 f–3dB and fCLK/f–3dB
ratio of 160:1. The LTC1164-6 is pin compatible with the
LTC1064-1.
U
APPLICATIO S
■
Antialiasing Filters
■
Battery-Operated Instruments
■
Telecommunication Filters
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
U
TYPICAL APPLICATIO
10kHz Anti-Aliasing Elliptic Filter
Frequency Response
1
2
3
4
5
6
7
14
13
12
11
10
9
NC
0
–10
–20
–30
–40
–50
–60
–70
–80
V
IN
NC
–8V
LTC1164-6
CLK = 1MHz
8V
–8V
V
OUT
8
1164-6 TA01
WIDEBAND NOISE = 115µV
RMS
NOTE: THE CONNECTION FROM PIN 7 TO PIN 14 SHOULD BE MADE
UNDER THE PACKAGE. THE POWER SUPPLIES SHOULD BE BYPASSED
BY A 0.1µF CAPACITOR AS CLOSE TO THE PACKAGE AS POSSIBLE.
1
10
100
FREQUENCY (kHz)
1164-6 TA02
11646fa
1
LTC1164-6
W W W
U
(Note 1)
ABSOLUTE AXI U RATI GS
Total Supply Voltage (V+ to V–) ............................. 16V
Input Voltage (Note 2) ......... (V++ 0.3V) to (V– – 0.3V)
Output Short-Circuit Duration......................... Indefinite
Power Dissipation............................................. 400mW
Burn-In Voltage ...................................................... 16V
Operating Temperature Range
LTC1164-6C ...................................... –40°C to 85°C
LTC1164-6M (OBSOLETE) .............. – 55°C to 125°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
W U
/O
PACKAGE RDER I FOR ATIO
TOP VIEW
ORDER PART
ORDER PART
TOP VIEW
1
2
3
4
5
6
7
CONNECT 2
NC
14
13
12
11
10
9
NC
NUMBER
NUMBER
V
NC
IN
CONNECT 2
NC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
–
LTC1164-6CN
LTC1164-6CSW
V
GND
V
IN
+
–
CLK
V
GND
V
+
ELL/BESS
GND
LP6
V
NC
V
OUT
GND
NC
CLK
NC
8
CONNECT 1
ELL/BESS
NC
LP6
N PACKAGE
14-LEAD PDIP
CONNECT 1
V
OUT
T
= 110°C, θ = 65°C/W
JMAX
JA
SW PACKAGE
16-LEAD PLASTIC SO
J PACKAGE 14-LEAD CERDIP
= 150°C, θ = 65°C/W
T
JMAX
LTC1164-6CJ
LTC1164-6MJ
JA
T
= 110°C, θ = 85°C/W
JA
JMAX
OBSOLETE PACKAGE
Consider the N14 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.
The
●
denotes specifications that apply over the full operating temperature
ELECTRICAL CHARACTERISTICS
range, otherwise specifications are at T = 25°C. V = ±7.5V, R = 10k, T = 25°C, f = 400kHz, TTL or CMOS level (maximum clock
A
S
L
A
CLK
rise or fall time ≤ 1µs) and all gain measurements are referenced to passband gain, unless otherwise specified. (f /f
) = 4kHz
CLK CUTOFF
at 100:1 and 8kHz at 50:1.
PARAMETER
CONDITIONS
= 1kHz, (f /f ) = 100:1
MIN
TYP
– 0.15
MAX
UNITS
dB
Passband Gain 0.1Hz to 0.25 f
(Note 4)
f
●
–0.50
0.25
CUTOFF
IN
CLK C
Passband Ripple with V = Single 5V
1Hz to 0.8 f (Table 2)
0.1 to – 0.3
–0.10
– 0.30
dB
dB
dB
dB
S
C
Gain at 0.50 f
Gain at 0.90 f
Gain at 0.95 f
(Note 3)
(Note 3)
(Note 3)
f
f
f
= 2kHz, (f /f ) = 100:1
●
●
●
–0.45
–0.75
–1.40
0.10
0.10
– 0.40
CUTOFF
CUTOFF
CUTOFF
IN
IN
IN
CLK C
= 3.6kHz, (f /f ) = 100:1
CLK
C
= 3.8kHz, (f /f ) = 100:1
– 0.70
CLK
C
Gain at f
(Note 3)
f
f
= 4kHz, (f /f ) = 100:1
●
●
–3.70
–3.10
–2.70
–2.10
–2.30
–1.50
dB
dB
CUTOFF
IN
IN
CLK C
= 8kHz, (f /f ) = 50:1
CLK
C
Gain at 1.44 f
(Note 3)
(Note 3)
= 20kHz
f
f
f
= 5.76kHz, (f /f ) = 100:1
= 8kHz, (f /f ) = 100:1
CLK C
●
●
–75
–75
–3.70
–64
–64
–2.70
–58
–58
–2.30
dB
dB
dB
CUTOFF
IN
IN
IN
CLK C
Gain at 2.0 f
CUTOFF
Gain with f
= 200Hz, (f /f ) = 100:1
CLK
CLK C
Gain with V = ±2.375V
f
f
= 400kHz, f = 2kHz, (f /f ) = 100:1
–0.50
–3.50
–0.10
–2.50
0.30
–2.00
dB
dB
S
IN
IN
IN
CLK C
= 400kHz, f = 4kHz, (f /f ) = 100:1
IN
CLK C
Input Frequency Range (Tables 3, 4)
(f /f ) = 100:1
0 – <f /2
kHz
kHz
CLK
C
CLK
(f /f ) = 50:1
0 – <f
CLK
C
CLK
11646fa
2
LTC1164-6
The
●
denotes specifications that apply over the full operating temperature
ELECTRICAL CHARACTERISTICS
range, otherwise specifications are at T = 25°C. V = ±7.5V, R = 10k, T = 25°C, f = 400kHz, TTL or CMOS level (maximum clock
CLK
A
S
L
A
rise or fall time ≤ 1µs) and all gain measurements are referenced to passband gain, unless otherwise specified. (f /f
) = 4kHz
CLK CUTOFF
at 100:1 and 8kHz at 50:1.
PARAMETER
CONDITIONS
V ≥ ±7.5V
MIN
TYP
MAX
UNITS
Maximum f (Table 3)
1.5
1.0
1.0
MHz
MHz
MHz
CLK
S
V ≤ ±5V
S
V = Single 5V, AGND = 2V
S
Clock Feedthrough
Wideband Noise
Input at GND, f = f , Square Wave
CLK
V = ±7.5V, (f /f ) = 100:1
500
200
µV
µV
S
CLK
C
RMS
RMS
V = ±5V, (f /f ) = 50:1
S
CLK C
Input at GND, 1Hz ≤ f < f
CLK
V = ±7.5V
115 ± 5%
100 ± 5%
µV
µV
S
RMS
RMS
kΩ
V = ±2.5V
S
Input Impedance
45
75
110
Output DC Voltage Swing
V = ±2.375V
S
V = ±7.5V
S
●
●
●
±1.25
±3.70
±5.40
±1.50
±4.10
±5.90
V
V
V
S
V = ±5V
Output DC Offset
Output DC Offset Tempco
Power Supply Current
V = ± 5V, (f /f ) = 100:1
±100
±100
2.5
±160
mV
µV/°C
mA
mA
mA
mA
S
CLK C
V = ± 5V, (f /f ) = 100:1
S
CLK C
V = ± 2.375V, T > 25°C
4.0
4.5
7.0
8.0
11.0
12.5
S
A
●
●
●
V = ± 5V, T > 25°C
4.5
7.0
S
A
V = ± 7.5V, T > 25°C
mA
mA
S
A
Power Supply Range
±2.375
±8
V
+
–
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Connecting any pin to voltages greater than V or less than V
may cause latch-up. It is recommended that no sources operating from
external supplies be applied prior to power-up of the LTC1164-6.
Note 3: All gains are measured relative to passband gain.
Note 4: The cutoff frequency of the filter is abbreviated as f
or f .
C
CUTOFF
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Stopband Gain vs Frequency
(Elliptic Response)
Stopband Gain vs Frequency
(Elliptic Response)
10
0
10
V
f
= ±5V
V
f
C
= ±5V
CLK
= 5kHz
S
S
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
= 250kHz
= 500kHz
CLK
(f /f ) = 50:1
f
CLK
C
–10
–20
–30
–40
–50
–60
–70
–80
–90
+
(PIN 10 AT V )
= 25°C
(f /f ) = 100:1
CLK
C
–
T
(PIN 10 AT V )
= 25°C
A
WITH EXTERNAL
SINGLE POLE LOW-
PASS RC FILTER
T
A
(f
= 10kHz)
– 3dB
6
8
10 12 14 16
18
20 22
2
4
6
8
10 12 14 16
18
20
22
2
4
FREQUENCY (kHz)
FREQUENCY (kHz)
1164-6 G01
1164-6 G02
11646fa
3
LTC1164-6
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Stopband Gain vs Frequency
(Linear Phase Response)
Passband Gain and Phase
vs Frequency
2.0
0
10
0
A. RESPONSE WITHOUT
EXTERNAL RC FILTER
V
= ±5V
S
1.5
1.0
–45
f
f
= 800kHz
CLK
= 5kHz
B. RESPONSE WITH AN
EXTERNAL SINGLE
–90
–10
–20
–30
–40
–50
–60
–70
–80
–90
C
(f /f ) = 160:1
CLK
C
POLE LOWPASS RC
0.5
–135
–180
–225
–270
–315
–360
–405
–450
(PIN 10 AT GND)
T
FILTER (f
AT 10kHz)
– 3dB
= 25°C
A
0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
V
= ±5V
S
f
f
= 500kHz
CLK
= 5kHz
A
B
C
(f /f ) = 100:1
CLK
C
–
(PIN 10 AT V )
= 25°C
T
A
2
6
10
14 18 22 26 30
FREQUENCY (kHz)
34
38
42
1
2
3
4
5
FREQUENCY (kHz)
1164-6 G03
1164-6 G04
Maximum Passband over
Temperature
Passband Gain and Phase vs
Frequency (Linear Phase Response)
Passband Gain vs Frequency
0.4
0.2
3
2
0
A
0.8
0.4
–30
B
C
0
1
–60
0
PHASE
–0.2
–0.4
–0.6
–0.8
–1.0
–1.2
–1.4
–1.6
0
–90
–0.4
–0.8
–1.2
–1.6
–2.0
–2.4
–2.8
A. T = 125°C
A
–1
–2
–3
–4
–5
–6
–7
–120
–150
–180
–210
–240
–270
–300
B. T = 85°C
A
GAIN
V
= ±5V
D. T = –40°C
S
A
f
f
= 500kHz
CLK
= 5kHz
V
f
C
= ±5V
CLK
= 5kHz
S
C
V
= ±5V
S
= 800kHz
(f /f ) = 100:1
CLK
C
–
f
f
= 1MHz
CLK
f
(PIN 10 AT V )
T
= 10kHz
CLK C
(f /f ) = 160:1
C
= 25°C
CLK
C
A
(f /f ) = 100:1
(PIN 10 AT GND)
= 25°C
(10 REPRESENTA-
TIVE UNITS)
–
(PIN 10 AT V )
T
A
1
5
10
0.4
1.0
2.2
2.8
3.4
4.0
1
2
3
4
5
1.6
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
1164-6 G07
1164-6 G05
1164-6 G11
Passband Gain and Phase vs
Frequency and f
Passband vs Frequency and f
CLK
CLK
0
3
2
2.0
1.5
A. RESPONSE WITHOUT
EXTERNAL SINGLE
POLE RC FILTER
A. f
f
B. f
f
C. f
f
D. f
f
= 400kHz
CUTOFF
CLK
V
= ±5V
S
–45
= 4kHz
(f /f ) = 100:1
CLK
C
–
= 600kHz
–90
1
CLK
A
B
(PIN 10 AT V )
= 25°C
1.0
B. RESPONSE WITH AN
EXTERNAL SINGLE
POLE LOWPASS RC
= 6kHz
CUTOFF
T
A
–135
–180
–225
–270
–315
–360
–405
–450
–495
–540
0
= 800kHz
0.5
CLK
–1
–2
–3
–4
–5
–6
–7
–8
–9
= 8kHz
CUTOFF
PHASE
A
FILTER (f
AT 10kHz)
– 3dB
0
= 1MHz
CLK
= 10kHz
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
CUTOFF
B
V
= ±5V
S
f
f
= 250kHz
CLK
C
= 5kHz
(f /f ) = 50:1
CLK
C
–
A
B
C
D
(PIN 10 AT V )
T
= 25°C
A
1
2
3
4
5
1
5
10
FREQUENCY (kHz)
INPUT FREQUENCY (kHz)
1164-6 G06
1164-6 G08
11646fa
4
LTC1164-6
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Maximum Passband over
Temperature
Passband vs Frequency and f
CLK
2.0
1.5
2.0
1.5
A. f
f
= 250kHz
CUTOFF
CLK
= 5kHz
B. f
CLK
f
CUTOFF
= 500kHz
1.0
1.0
= 10kHz
= 20kHz
C. f
f
= 1MHz
T
= 70°C
A
0.5
CLK
CUTOFF
0.5
0
0
T
= –40°C
A
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–0.5
–1.0
–1.5
A
C
B
V
= SINGLE 5V
S
(f /f ) = 50:1
CLK
C
GND = 2V WITH
V
= ±8V
C
S
–2.0 EXTERNAL RC
(f /f ) = 50:1
CLK
+
LOWPASS FILTER
(f
(PIN 10 AT V )
= 25°C
–2.5
= 40kHz)
T
– 3dB
4
A
–3.0
1
10
FREQUENCY (kHz)
30
10 12 14 16
2
6
8
18
20
22
FREQUENCY (kHz)
1164-6 G09
1164-6 G10
Group Delay vs Frequency
(Linear Phase Response)
Group Delay vs Frequency
(Elliptic Response)
THD + Noise vs Frequency
(Elliptic Response)
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
250
200
150
100
50
700
600
500
400
300
200
100
0
V
= ±5V, V = 1V
IN RMS
A. f
CLK
= 250kHz, (f /f ) = 50:1
CLK C
S
f
= 800kHz
CLK
–
(20k RESISTOR PIN 14 TO V )
= 500kHz, f = 5kHz
WITH EXTERNAL RC LOWPASS
(f /f ) = 160:1
CLK
C
f
FILTER (f = 10kHz)
CLK
C
C
f
= 5kHz
C
A
B
(f /f ) = 100:1, T = 25°C
B. f
CLK
= 500kHz
CLK
C
A
(5 REPRESENTATIVE UNITS)
(f /f ) = 100:1
CLK
C
V
f
= ±5V
S
= 5kHz
C
T
= 25°C
A
0
1
2
3
4
5
1
3
4
5
7
8
9
10 11
2
6
1
2
3
4
5
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
1164-6 G13
1164-6 G22
1164-6 G12
THD + Noise vs Frequency
(Elliptic Response)
THD + Noise vs Frequency
(Elliptic Response)
THD + Noise vs Frequency
(Linear Phase Response)
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
V
V
f
= ±5V
V
f
= SINGLE 5V, V = 0.7V
IN
V
f
= ±5V, V = 1V
,
RMS
S
S
RMS
S
IN
= 1V
= 500kHz, f = 5kHz,
= 500kHz, f = 10kHz,
IN
CLK
= 5kHz
RMS
CLK
C
CLK
CLK
C
= 800kHz
(f /f ) = 100:1, T = 25°C
(f /f ) = 50:1, T = 25°C,
CLK
C
A
C
A
f
(5 REPRESENTATIVE UNITS)
WITH EXTERNAL RC LOWPASS
FILTER (f = 20kHz)
(5 REPRESENTATIVE UNITS)
C
(f /f ) = 160:1
CLK
C
– 3dB
T
A
= 25°C
0.5
1
5
1
2
3
4
5
1
5
10
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
1164-6 G23
1164-6 G14
1164-6 G16
11646fa
5
LTC1164-6
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Power Supply Current vs Power
Supply Voltage
THD + Noise vs RMS Input
(Elliptic Response)
THD + Noise vs RMS Input for
Single 5V (Elliptic Response)
12
11
10
9
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
(f /f ) = 100:1 OR 50:1
CLK
C
(f /f ) = 100:1 OR 50:1
IN
CLK
C
f
= 1kHz, T = 25°C
–55°C
IN
A
f
= 1kHz, T = 25°C
A
A
B
25°C
8
125°C
7
V
V
= ±5V
S
6
5
4
3
= ±7.5V
2
S
A. GND = 2.5V
B. GND = 2V
1
0
0
1
2
3
4
5
6
7
8
9
10
0.1
1
2
0.1
1
5
+
–
POWER SUPPLY (V OR V )
INPUT (V
)
INPUT (V )
RMS
RMS
1164-6 G17
1164-6 G18
1164-6 G19
Transient Response
Transient Response
1164-6 G21
1164-6 G20
1ms/DIV
1ms/DIV
VS = ±7.5V, VIN = ±3V 100Hz SQUARE WAVE
CLK = 800kHz, (fCLK/fC) = 160:1, fCUTOFF = 5kHz
LINEAR PHASE RESPONSE
VS = ±7.5V, VIN = ±3V 100Hz SQUARE WAVE
CLK = 500kHz, (fCLK/fC) = 100:1, fCUTOFF = 5kHz
ELLIPTIC RESPONSE
f
f
U
U
U
PI FU CTIO S (14-Lead Dual-In-Line Package)
NC (Pins 1, 8, 13): Pins 1, 8, and 13 are not connected to
any internal circuit point on the device and should prefer-
ably be tied to analog ground.
at least a 1µF capacitor (Figure 2). For single 5V operation
at the highest fCLK of 1MHz, Pins 3 and 5 should be biased
at 2V. This minimizes passband gain and phase variations
(see Typical Performance Characteristics curves: Maxi-
mum Passband for Single 5V, 50:1; and THD + Noise vs
RMS Input for Single 5V, 50:1).
V+ (Pins 4, 12):The V+ (Pin 4) and the V– (Pin 12) should
be bypassed with a 0.1µF capacitor to an adequate analog
ground. The filter’s power supplies should be isolated
from other digital or high voltage analog supplies. A low
noise linear supply is recommended. Using a switching
power supply will lower the signal-to-noise ratio of the
filter. The supply during power-up should have a slew rate
less than 1V/µs. When V+ is applied before V– and V–
VIN (Pin 2): The input pin is connected internally through
a 50k resistor tied to the inverting input of an op amp.
GND (Pins 3, 5): The filter performance depends on the
quality of the analog signal ground. For either dual or
single supply operation, an analog ground plane sur-
roundingthepackageisrecommended.Theanalogground
planeshouldbeconnectedtoanydigitalgroundatasingle
point. For dual supply operation, Pins 3 and 5 should be
connected to the analog ground plane. For single supply
operation Pins 3 and 5 should be biased at 1/2 supply and
they should be bypassed to the analog ground plane with
11646fa
6
LTC1164-6
U
U
U
(14-Lead Dual-In-Line Package)
PI FU CTIO S
could go above ground, a signal diode must be used to
clampV.Figures1and2showtypicalconnectionsfordual
and single supply operation.
buffer,Figure3,canbeusedprovidedthatitsinputcommon
mode range is well within the filter’s output swing. Pin 6 is
an intermediate filter output providing an unspecified 6th
order lowpass filter. Pin 6 should not be loaded.
–
V
1
2
3
4
5
6
7
14
13
12
11
10
9
*
ELLIPTIC/LINEARPHASE(Pin10):TheDClevelatthispin
selects the desired filter response, elliptic or linear phase
and determines the ratio of the clock frequency to the
cutoff frequency of the filter. Pin 10 connected to V–
provides an elliptic lowpass filter with clock-to-fCUTOFF
ratio of 100:1. Pin 10 connected to analog ground pro-
vides a linear phase lowpass filter with a clock- to-f–3dB
ratio of 160:1 and a transient response overshoot of 1%.
When Pin 10 is connected to V+ the clock-to-fCUTOFF ratio
is 50:1 and the filter response is elliptic. Bypassing Pin 10
to analog ground reduces the output DC offsets. If the DC
level at Pin 10 is switched mechanically or electrically at
slewratesgreaterthan1V/µswhilethedeviceisoperating,
a10kresistorshouldbeconnectedbetweenPin10andthe
DC source.
V
V
0.1µF
IN
+
1k
CLOCK SOURCE
LTC1164-6
0.1µF
GND
DIGITAL SUPPLY
+
8
* OPTIONAL
V
1164-6 F01
OUT
Figure 1. Dual Supply Operation for f /f
= 100:1
CLK CUTOFF
1
2
3
4
5
6
7
14
13
12
11
10
9
V
IN
+
1k
V
LTC1164-6
CLOCK SOURCE
0.1µF
CLK (Pin 11): Any TTL or CMOS clock source with a
square-wave output and 50% duty cycle (±10%) is an
adequateclocksourceforthedevice.Thepowersupplyfor
the clock source should not be the filter’s power supply.
The analog ground for the filter should be connected to
clock’s ground at a single point only. Table 1 shows the
clock’s low and high level threshold value for a dual or
single supply operation. A pulse generator can be used as
a clock source provided the high level ON time is greater
than 0.5µs. Sine waves are not recommended for clock
input frequencies less than 100kHz, since excessively
slow clock rise or fall times generate internal clock jitter
(maximum clock rise or fall time ≤ 1µs). The clock signal
should be routed from the right side of the IC package to
avoid coupling into any input or output analog signal path.
A 1k resistor between clock source and Pin 11 will slow
down the rise and fall times of the clock to further reduce
charge coupling, Figures 1 and 2.
GND
DIGITAL SUPPLY
10k
10k
+
8
+
1µF
V
OUT
1164-6 F02
Figure 2. Single Supply Operation for f /f
= 100:1
CLK CUTOFF
Table 1. Clock Source High and Low Threshold Levels
POWER SUPPLY
Dual Supply = ±7.5V
Dual Supply = ±5V
Dual Supply = ±2.5V
Single Supply = 12V
Single Supply = 5V
HIGH LEVEL
≥ 2.18V
≥ 1.45V
≥ 0.73V
≥ 7.80V
≥ 1.45V
LOW LEVEL
≤ 0.5V
≤ 0.5V
≤ – 2.0V
≤ 6.5V
≤ 0.5V
V– (Pins 7, 14): Pins 7 and 14 should be connected
together. In a printed circuit board the connection should
be done under the IC package through a short trace
surrounded by the analog ground plane.
–
VOUT (Pins 9, 6): Pin 9 is the specified output of the filter;
it can typically source or sink 1mA. Driving coaxial cables
or resistive loads less than 20k will degrade the total
harmonicdistortionofthefilter.Whenevaluatingthedevice’s
distortion an output buffer is required. A noninverting
1k
+
LT1006, f < 5kHz
C
LT1200, f > 5kHz
C
1164-6 F03
Figure 3. Buffer for Filter Output
11646fa
7
LTC1164-6
O U
W U
PPLICATI
A
S I FOR ATIO
Table 3. Clock Feedthrough
Passband Response
V
50:1
60µV
100µV
150µV
100:1
60µV
S
The passband response of the LTC1164-6 is optimized for
a fCLK/fCUTOFF ratio of 100:1. Minimum passband ripple
occursfrom1Hzto80%offCUTOFF. Athoughthepassband
of the LTC1164-6 is optimized for ratio fCLK/fCUTOFF of
100:1, if a ratio of 50:1 is desired, connect a single pole
lowpass RC (f–3dB = 2 fCUTOFF) at the output of the filter.
TheRCwillmakethepassbandgainresponseasflatasthe
100:1 case. If the RC is omitted, and clock frequencies are
below 500kHz the passband gain will peak by 0.4dB at
± 2.5V
±5V
± 7.5V
RMS
RMS
200µV
500µV
RMS
RMS
RMS
RMS
Note: The clock feedthrough at ±2.5V supplies is imbedded in the wideband noise of the filter. (The
clock signal is a square wave.)
Any parasitic switching transients during the rise and fall
edges of the incoming clock are not part of the clock
feedthroughspecifications. Switchingtransientshavefre-
quency contents much higher than the applied clock; their
amplitude strongly depends on scope probing techniques
as well as grounding and power supply bypassing. The
clock feedthrough, if bothersome, can be greatly reduced
by adding a simple R/C lowpass network at the output of
the filter (Pin 9). This R/C will completely eliminate any
switching transient.
90% fCUTOFF
.
Table 2. Typical Passband Ripple with Single 5V Supply
(f /f ) = 100:1, GND = 2V, 30kHz, Fixed Single Pole, Lowpass
CLK
C
RC Filter at Pin 9 (See Typical Applications)
PASSBAND
FREQUENCY
PASSBAND GAIN
(REFERENCED TO 0dB)
f
= 1kHz
f
= 10kHz
CUTOFF
CUTOFF
T = 25°C
T = 0°C
T = 25°C
T = 70°C
A
A
(dB)
A
A
Wideband Noise
% of f
(dB)
(dB)
(dB)
CUTOFF
10
20
30
40
50
60
70
80
The wideband noise of the filter is the total RMS value of
the device’s noise spectral density and it is used to
determine the operating signal-to-noise ratio. Most of its
frequency contents lie within the filter passband and it
cannot be reduced with post filtering. For instance, the
0.00
0.00
0.00
0.00
0.01
– 0.01
– 0.02
– 0.01
0.01
0.00
0.01
0.01
0.02
0.03
0.05
0.07
0.02
– 0.05
– 2.68
– 0.02
– 0.05
– 0.10
– 0.13
– 0.15
– 0.18
– 0.25
– 0.39
– 2.68
– 0.01
– 0.02
– 0.03
– 0.01
– 0.01
– 0.08
– 0.23
– 2.79
0.01
LTC1164-6widebandnoiseat±2.5Vsupplyis100µVRMS
,
– 0.05
– 0.18
– 2.74
90µVRMS of which have frequency contents from DC up to
the filter’s cutoff frequency. The total wideband noise
(µVRMS) is nearly independent of the value of the clock.
The clock feedthrough specifications are not part of the
wideband noise.
90
f
CUTOFF
The gain peaking can approximate a sin χ/χ correction for
someapplications.(SeeTypicalPerformanceCharacteristics
curve, Passband vs Frequency and fCLK at fCLK/fC = 50:1.)
Speed Limitations
WhentheLTC1164-6operateswithasingle5Vsupplyandits
cutoff frequency is clock-tuned to 10kHz, an output single
pole RC filter can also help maintain outstanding passband
flatness from 0°C to 70°C. Table 2 shows details.
The LTC1164-6 optimizes AC performance versus power
consumption. To avoid op amp slew rate limiting at
maximum clock frequencies, the signal amplitude should
be kept below a specified level as shown on Table 4.
Clock Feedthrough
Aliasing
Clock feedthrough is defined as, the RMS value of the
clock frequency and its harmonics that are present at the
filter’s output (Pin 9). The clock feedthrough is tested with
the input (Pin 2) grounded and, it depends on PC board
layout and on the value of the power supplies. With proper
layout techniques the values of the clock feedthrough are
shown in Table 3.
Aliasing is an inherent phenomenon of sampled data
systems and it occurs when input frequencies close to the
sampling frequency are applied. For the LTC1164-6 case,
an input signal whose frequency is in the range of fCLK
±4%, will be aliased back into the filter’s passband. If, for
instance, an LTC1164-6 operating with a 100kHz clock
11646fa
8
LTC1164-6
O U
W U
PPLICATI
S I FOR ATIO
A
Table 6. Transient Response of LTC Lowpass Filters
and 1kHz cutoff frequency receives a 98.5kHz, 10mVRMS
input signal, a 1.5kHz, 10µVRMS alias signal will appear at
its output. When the LTC1164-6 operates with a clock-to-
cutoff frequency of 50:1, aliasing occurs at twice the clock
frequency. Table 5 shows details.
DELAY
TIME*
(SEC)
RISE
SETTLING OVER-
TIME** TIME*** SHOOT
LOWPASS FILTER
(SEC)
(SEC)
(%)
LTC1064-3 Bessel
LTC1164-5 Linear Phase
LTC1164-6 Linear Phase
0.50/f
0.43/f
0.43/f
0.34/f
0.34/f
0.34/f
0.80/f
0.85/f
1.15/f
0.5
0
1
C
C
C
C
C
C
C
C
C
Table 4. Maximum V vs V and f
IN
S
CLK
CLK
POWER SUPPLY
MAXIMUM f
MAXIMUM V
IN
(f > 35kHz)
RMS IN
LTC1264-7 Linear Phase
LTC1164-7 Linear Phase
LTC1064-7 Linear Phase
1.15/f
1.20/f
1.20/f
0.36/f
0.39/f
0.39/f
2.05/f
2.20/f
2.20/f
5
5
5
C
C
C
C
C
C
C
C
C
±7.5V
1.5MHz
1MHz
≥1MHz
1MHz
1MHz
1MHz
1MHz
1V
3V
0.7V
(f > 25kHz)
RMS IN
(f > 250kHz)
RMS IN
LTC1164-5 Butterworth
0.80/f
0.48/f
2.40/f
11
C
C
C
±5V
2.5V
0.5V
(f > 25kHz)
RMS IN
(f > 100kHz)
RMS IN
LTC1164-6 Elliptic
LTC1064-4 Elliptic
LTC1064-1 Elliptic
0.85/f
0.90/f
0.85/f
0.54/f
0.54/f
0.54/f
4.30/f
4.50/f
6.50/f
18
20
20
C
C
C
C
C
C
C
C
C
Single 5V
0.7V
0.5V
(f > 25kHz)
RMS IN
(f > 100kHz)
RMS IN
* To 50% ±5%, ** 10% to 90% ±5%, *** To 1% ±0.5%
Table 5. Aliasing (f
INPUT FREQUENCY
= 100kHz)
CLK
OUTPUT LEVEL
(Relative to Input)
(dB)
OUTPUT FREQUENCY
(Aliased Frequency)
(kHz)
(V = 1V
)
IN
RMS
t
s
OUTPUT
INPUT
(kHz)
/f = 100:1, f = 1kHz
CUTOFF
90%
50%
10%
f
CLK
C
96 (or 104)
97 (or 103)
98 (or 102)
98.5 (or 101.5)
99 (or 101)
–75.0
– 68.0
– 65.0
– 60.0
– 3.2
4.0
3.0
2.0
1.5
1.0
0.5
t
d
99.5 (or 100.5)
– 0.5
t
r
f
/f = 50:1, f = 2kHz
CUTOFF
CLK
C
192 (or 208)
194 (or 206)
196 (or 204)
198 (or 202)
199 (or 201)
199.5(or 200.5)
–76.0
– 68.0
– 63.0
– 3.4
– 1.3
– 0.9
8.0
6.0
4.0
2.0
1.0
0.5
0.54
CUTOFF
RISE TIME (t ) =
±5%
r
f
4.3
CUTOFF
SETTLING TIME (t ) =
s
(TO 1% of OUTPUT)
±5%
f
0.85
CUTOFF
TIME DELAY (t ) = GROUP DELAY ≈
(TO 50% OF OUTPUT)
d
1164-6 F04
f
Figure 4
U
O
TYPICAL APPLICATI S
8th Order Elliptic Lowpass Filter
(f /f ) = 50:1
CLK
C
1
2
14
13
12
11
10
9
V
+
IN
+
V
NOTES:
1. OPTIONAL OUTPUT BUFFER
1/2πRC = (2)(f
3
4
5
6
7
–
V
)
CUTOFF
0.1µF
LTC1164-6
f
V
–
CLK
+
2. PINS 1, 8, 13 CAN BE GROUNDED
OR LEFT FLOATING
®
0.1µF
LT 1006
V
R
+
V
OUT
1164-6 TA06
8
C
–
V
11646fa
9
LTC1164-6
TYPICAL APPLICATI S
U
O
8th Order Elliptic Lowpass Filter (f /f ) = 100:1
8th Order Linear Phase Lowpass Filter (f /f ) = 160:1
CLK C
CLK
C
1
2
3
4
5
6
7
1
2
3
4
5
6
7
14
13
12
11
10
9
14
13
12
11
10
9
V
V
IN
+
IN
+
–
–
V
V
LTC1164-6
0.1µF
LTC1164-6
f
0.1µF
f
V
V
CLK
CLK
0.1µF
0.1µF
V
V
OUT
OUT
8
8
1164-6 TA07
1164-6 TA08
8th Order 20kHz Cutoff, Elliptic Filter Operating with a Single 5V Supply and Driving 1k, 1000pF Load
1
2
3
4
5
6
7
14
13
12
11
10
9
5V
5V
V
IN
NOTES:
1. TOTAL SUPPLY CURRENT I = 4mA
S
(EXCLUDING OUTPUT LOAD CURRENT)
2. FLAT PASSBAND UP TO 18kHz,
1k
5V
7
2
3
f
CLK
LTC1164-6
5V
51.1k
–
+
= 1MHz
f
= 20kHz
0.1µF
0.1µF
–3dB
3. THD + NOISE ≤ –70dB,
1V ≤ V ≤3V , f = 1kHz
V
LT1200
4
OUT
10k
10k
P-P IN P-P IN
1k
8
1000pF
510pF
1164-6 TA09
6.65k
Single 5V, 16th Order Lowpass Filter f
= 10kHz
CUTOFF
R1
789Ω
1
2
3
4
5
6
7
14
13
12
11
10
9
1
2
3
4
5
6
7
14
13
12
11
10
9
V
= SINGLE 5V, I = 5mA TYP
S
S
V
IN
16TH ORDER LOWPASS FILTER
C1
FIXED f
, f
= 540kHz
CUTOFF CLK
0.01µF
f
= 10kHz
CUTOFF
(f /f ) = 54:1
CLK
C
LTC1164-6
IC1
LTC1164-6
IC2
1/2πR1C1 = 1/2πR2C2 = 2f
CUTOFF
5V
5V
0.1µF
0.1µF
15k
10k
5V
5V
V
OUT
+
8
8
R2
7.89k
C2
1µF
0.001µF
1k
f
1164-6 TA03
CLK
Gain vs Frequency
THD + Noise vs Frequency
–40
–45
–50 ELLIPTIC LOWPASS
10
V
= SINGLE 5V
S
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
IS = 5mA, 16TH ORDER
V
= 0.5V
IN
RMS
= 540kHz
–55
–60
–65
–70
–75
–80
–85
–90
f
f
CLK
C
= 10kHz
V
S
= SINGLE 5V
S
I
= 5mA, 16TH ORDER
ELLIPTIC LOWPASS
f
f
= 540kHz
CLK
CUTOFF
= 10kHz
1
10
FREQUENCY (kHz)
30
1
5
10
FREQUENCY (kHz)
1164-6 TA05
1164-6 TA04
11646fa
10
LTC1164-6
U
PACKAGE DESCRIPTION
J Package
14-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
.840
(21.336)
CORNER LEADS OPTION
(4 PLCS)
.005
(0.127)
MIN
MAX
16
10
15
14
12
11
9
8
13
.023 – .045
(0.584 – 1.143)
HALF LEAD
OPTION
.220 – .310
(5.588 – 7.874)
.025
(0.635)
RAD TYP
.045 – .065
(1.143 – 1.65)
FULL LEAD
OPTION
2
3
5
1
4
6
7
.200
(5.080)
MAX
.300 BSC
(7.62 BSC)
.015 – .060
(0.380 – 1.520)
.008 – .018
(0.203 – 0.457)
0° – 15°
.045 – .065
(1.143 – 1.651)
.125
(3.175)
MIN
.100
(2.54)
BSC
.014 – .026
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
(0.360 – 0.660)
J16 0801
OBSOLETE PACKAGE
N Package
14-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.770*
(19.558)
MAX
14
13
12
11
10
9
8
7
.255 ± .015*
(6.477 ± 0.381)
1
2
3
5
6
4
.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
.325
.005
(0.127)
MIN
–.015
.120
(3.048)
MIN
.018 ± .003
.100
(2.54)
BSC
+0.889
8.255
(0.457 ± 0.076)
(
)
–0.381
N14 1103
NOTE:
INCHES
MILLIMETERS
1. DIMENSIONS ARE
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
11646fa
InformationfurnishedbyLinearTechnologyCorporationisbelievedtobeaccurateandreliable.However,
no responsibility is assumed for its use. Linear Technology Corporation makes no representation that
the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
LTC1164-6
U
TYPICAL APPLICATION
8th Order Low Power, Clock-Tunable Elliptic Filter with Active RC Input Antialiasing Filter and Output Smoothing Filter
C2
0.022µF
R1
1.15k
R2
76.8k
R3
5.62k
1
2
3
4
5
6
7
14
13
12
11
10
9
V
+
IN
1/2
C3
0.001µF
C1
LT1013
0.1µF
–
V
–
0.1µF
+
LTC1164-6
f
V
–
CLK
–
f
C
= 1kHz
1/2
LT1013
0.1µF
V
OUT
V
ATTENUATION AT 10kHz = –48dB
+
NOTES:
C2
0.001µF
R2
97.6k
8
R1
16.9k
C1
0.0047µF
1. CLOCK-TUNABLE OVER ONE DECADE
OF CUTOFF FREQUENCY
2. BOTH INPUT AND OUTPUT RC ACTIVE
FILTERS ARE 0.1dB CHEBYSHEV FILTERS
WITH 1kHz RIPPLE BANDWIDTH
100Hz ≤ f ≤ 1kHz
C
10kHz ≤ f
CLK
≤ 100kHz
f
= 1kHz
C
ATTENUATION AT 10kHz = –30dB
1164-6 TA10
U
PACKAGE DESCRIPTION
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
N/2
8
1
2
3
N/2
RECOMMENDED SOLDER PAD LAYOUT
2
3
5
7
1
4
6
.291 – .299
(7.391 – 7.595)
NOTE 4
.037 – .045
.093 – .104
.010 – .029
(0.254 – 0.737)
(0.940 – 1.143)
× 45°
(2.362 – 2.642)
.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)
S16 (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)
RELATED PARTS
PART NUMBER
LTC1069-1
DESCRIPTION
COMMENTS
Operates from a Single 3.3V to ±5V Supply
Low Power, 8th Order Elliptic Lowpass
Very Low Power 8th Order Elliptic Lowpass
LTC1069-6
Optimized for 3V/5V Single Supply Operation, Consumes 1mA at 3V
11646fa
LT 0207 REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
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© LINEAR TECHNOLOGY CORPORATION 1993
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
相关型号：
LTC1164-6CN#PBF
LTC1164-6 - Low Power 8th Order Pin Selectable Elliptic or Linear Phase Lowpass Filter; Package: PDIP; Pins: 14; Temperature Range: 0°C to 70°C
Linear
LTC1164-6CSW#TR
LTC1164-6 - Low Power 8th Order Pin Selectable Elliptic or Linear Phase Lowpass Filter; Package: SO; Pins: 16; Temperature Range: 0°C to 70°C
Linear
LTC1164-6CSW#TRPBF
LTC1164-6 - Low Power 8th Order Pin Selectable Elliptic or Linear Phase Lowpass Filter; Package: SO; Pins: 16; Temperature Range: 0°C to 70°C
Linear
LTC1164-6MJ#PBF
IC SWITCHED CAPACITOR FILTER, ELLIPTIC/BESSEL, LOWPASS, CDIP14, CERDIP-14, Active Filter
Linear
LTC1164-6MS
IC SWITCHED CAPACITOR FILTER, ELLIPTIC, LOWPASS, PDSO14, PLASTIC, SO-14, Active Filter
Linear
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