LTC1164-5MJ [Linear]
Low Power 8th Order Pin Selectable Butterworth or Bessel Lowpass Filter; 低功耗8阶引脚可选巴特沃斯或贝塞尔低通滤波器
| 型号： | LTC1164-5MJ |
| 厂家： | 
Linear |
| 描述： | Low Power 8th Order Pin Selectable Butterworth or Bessel Lowpass Filter |
| 文件： | 总12页 (文件大小：207K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1164-5
Low Power 8th Order
Pin Selectable Butterworth
or Bessel Lowpass Filter
U
FEATURES
DESCRIPTIO
The LTC®1164-5 is a monolithic 8th order filter; it approxi-
mates either a Butterworth or a Bessel lowpass response.
The LTC1164-5 features clock-tunable cutoff frequency
and low power consumption (4.5mA with ±5V supplies
and 2.5mA with single 5V supply).
■
Pin Selectable Butterworth or Bessel Response
■
4mA Supply Current with ±5V Supplies
■
fCUTOFF up to 20kHz
100µVRMS Wideband Noise
THD < 0.02% (50:1, VS = ±7.5V, VIN = 2VRMS
Operates with a Single 5V Supply (1VRMS Input
Range)
60µVRMS Clock Feedthrough (Single 5V Supply)
Operates up to ±8V Supplies
TTL/CMOS-Compatible Clock Input
No External Components
■
■
)
■
Low power operation is achieved without compromising
noise or distortion performance. With ±5V supplies and
10kHz cutoff frequency, the operating signal-to-noise
ratio is 86dB and the THD throughout the passband is
0.015%. Under the same conditions, a 77dB signal-to-
noise ratio and distortion is obtained with a single 5V
supply while the clock feedthrough is kept below the noise
level. The maximum signal-to-noise ratio is 92dB.
■
■
■
■
U
APPLICATIO S
The LTC1164-5 approximates an 8th order Butterworth
response with a clock-to-cutoff frequency ratio of 100:1
(Pin 10 to V–) or 50:1 double-sampled (Pin 10 to V+ and
Pin1shortedtoPin13). Double-samplingallowstheinput
signal frequency to reach the clock frequency before any
aliasing occurrence. An 8th order Bessel response can
also be approximated with a clock-to-cutoff frequency
ratio of 140:1 (Pin 10 to ground). With ±7.5V supply, ±5V
supply and single 5V supply, the maximum clock fre-
quency of the LTC1164-5 is 1.5MHz, 1MHz, and 1MHz
respectively. The LTC1164-5 is pin-compatible with the
LTC1064-2 and LTC-1064-3.
■
Anti-Aliasing Filters
■
Battery-Operated Instruments
■
Telecommunications Filters
Smoothing Filters
■
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
Frequency Response
TYPICAL APPLICATIO
0
–10
–20
–30
Butterworth 20kHz Anti-Aliasing Filter
1
2
3
4
5
6
7
14
13
12
V
IN
–40
WIDEBAND NOISE = 110µV
–8V
RMS
THD IN PASSBAND < 0.02% AT V = 2V
RMS
11
10
9
IN
–50
–60
–70
–80
LTC1164-5
CLK = 1MHz
8V
NOTE: THE CONNECTION FROM PIN 7 TO PIN 14
SHOULD BE MADE UNDER THE PACKAGE.
FOR 50:1 OPERATION CONNECT PIN 1 TO PIN 13
AS SHOWN. FOR 100:1 OR 150:1 OPERATION PINS 1
AND 13 SHOULD FLOAT. THE POWER SUPPLIES
SHOULD BE BYPASSED BY A 0.1µF CAPACITOR AS
CLOSE TO THE PACKAGE AS POSSIBLE.
+
TO V
NC
V
OUT
8
1164-5 TA01
1
10
100
FREQUENCY (kHz)
LTC1164-5 TA02
1
LTC1164-5
W W U W
ABSOLUTE AXI U RATI GS (Note 1)
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
LTC1164-5C ...................................... –40°C to 85°C
LTC1164-5M .................................... –55°C to 125°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
U
W
U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
TOP VIEW
ORDER PART
NUMBER
ORDER PART
50:1 MODE
1
2
3
4
5
6
7
8
16 CONNECT 2
NUMBER
1
2
3
4
5
6
7
CONNECT 2
50:1 MODE
14
13
12
11
10
9
50:1 MODE
V
15 50:1 MODE
–
V
IN
IN
LTC1164-5CN
LTC1164-5CJ
LTC1164-5MJ
LTC1164-5CS
–
GND
14
13
12
11
10
9
V
V
GND
+
+
V
NC
CLK
V
GND
NC
CLK
BUTT/BESS
GND
LP6
BUTT/BESS
NC
V
OUT
LP6
NC
8
CONNECT 1
CONNECT 1
V
OUT
N PACKAGE
J PACKAGE
14-LEAD PDIP
14-LEAD CERDIP
S PACKAGE
16-LEAD PLASTIC SW
TJMAX = 150°C, θJA = 65°C/W (J)
TJMAX = 110°C, θJA = 65°C/W (N)
TJMAX = 110°C, θJA = 85°C/W
Consult factory for Industrial grade parts.
ELECTRICAL CHARACTERISTICS
VS = ±7.5V, RL = 10k, fCLK = 400kHz, TA = Operating Temperature Range, unless otherwise specified.
LTC1164-5C
TYP
PARAMETER
CONDITIONS
MIN
MAX
UNITS
Passband Gain 0.1Hz at 0.25f
(Note 3)
f
f
= 1kHz, (f /f ) = 100:1
●
●
–0.5
–0.5
–0.10
0.10
0.25
0.25
dB
dB
CUTOFF
IN
IN
CLK C
= 1kHz, (f /f ) = 50:1
CLK
C
Gain at 0.50f
(Note 3)
f
f
= 2kHz, (f /f ) = 100:1
●
●
–0.45
–0.35
–0.20
–0.10
0.17
0.40
dB
dB
CUTOFF
IN
IN
CLK C
= 4kHz, (f /f ) = 50:1
CLK
C
Gain at 0.90f
Gain at 0.95f
(Note 3)
(Note 3)
f
f
= 3.6kHz, (f /f ) = 100:1
●
–2.50
–1.90
–2.60
–1.0
dB
dB
CUTOFF
IN
IN
CLK C
= 3.8kHz, (f /f ) = 100:1
CUTOFF
CLK
C
Gain at f
(Note 3)
f
f
= 4kHz, (f /f ) = 100:1
●
●
–4.10
–4.20
–3.40
–3.80
–2.75
–2.75
dB
dB
CUTOFF
IN
IN
CLK C
= 8kHz, (f /f ) = 50:1
CLK
C
Gain at 1.44f
(Note 3)
f
f
f
= 5.76kHz, (f /f ) = 100:1
●
●
●
–20.5
–45.0
–4.50
–19.0
–43.0
–3.40
–17.0
–41.0
–2.75
dB
dB
dB
CUTOFF
IN
IN
IN
CLK C
Gain at 2.0f
(Note 3)
= 8kHz, (f /f ) = 100:1
CLK C
CUTOFF
Gain with f
= 20kHz (Note 3)
= 200Hz, (f /f ) = 100:1
CLK C
CLK
Gain with V = 2.375V (Note 3)
f
f
= 400kHz, f = 2kHz, (f /f ) = 100:1
–0.50
–4.20
–0.10
–3.40
0.35
–2.00
dB
dB
S
IN
IN
IN
CLK C
= 400kHz, f = 4kHz, (f /f ) = 100:1
IN
CLK C
Input Frequency Range
(f /f ) = 100:1
0 – <f /2
kHz
kHz
CLK
C
CLK
(f /f ) = 50:1
0 – <f
CLK
C
CLK
2
LTC1164-5
ELECTRICAL CHARACTERISTICS
VS = ±7.5V, RL = 10k, fCLK = 400kHz, TA = Operating Temperature Range, unless otherwise specified.
LTC1164-5C
PARAMETER
Maximum f
CONDITIONS
V ≥ ±7.5V
MIN
TYP
MAX
UNITS
1.5
1.0
1.0
MHz
MHz
MHz
CLK
S
V = ±5.0V
S
V = Single 5V (GND = 2V)
S
Clock Feedthrough
Wideband Noise
Input at GND, f = f , Square Wave
CLK
±5V, (f /f ) = 100:1
200
100
µV
µV
CLK
C
RMS
RMS
±5V, (f /f ) = 50:1
CLK
C
Input at GND, 1Hz ≥ f < f
CLK
±5V, (f /f ) = 100:1
100 ±5%
115 ±5%
µV
RMS
µV
RMS
CLK
C
±5V, (f /f ) = 50:1
CLK
C
Input Impedance
70
100
160
kΩ
Output DC Voltage Swing
V = ±2.375V
●
●
●
±1.25
±3.70
±5.40
±1.50
±4.10
±5.90
V
V
V
S
V = ±5.0V
S
V = ±7.5V
S
Output DC Offset
V = ±5V, (f /f ) = 100:1
±50
±100
2.5
±160
mV
S
CLK C
Output DC Offset TempCo
Power Supply Current
V = ±5V, (f /f ) = 100:1
µV/°C
S
CLK C
V = ±2.375V, T ≥ 25°C
4.0
4.5
7.0
8.0
11.0
12.5
mA
mA
mA
mA
mA
mA
S
A
●
●
●
V = ±5.0V, T ≥ 25°C
4.5
7.0
S
A
V = ±7.5V, T ≥ 25°C
S
A
Power Supply Range
±2.375
±8
V
+
–
The
●
denotes specifications which apply over the full operating
Note 2: Connecting any pin to voltages greater than V or less than V
may cause latchup. It is recommended that no sources operating from
external supplies be applied prior to power-up of the LTC1164-5.
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which life of
Note 3: All gains are measured relative to passband gain. The filter cutoff
the device may be impaired.
frequency is abbreviated as f
or f .
CUTOFF
C
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Passband Gain and Phase
vs Frequency
Gain vs Frequency
A. f
f
= 100kHz
= 1kHz
CLK
CUTOFF
(100:1, PIN 10 TO V )
0
–10
–20
–
A
B
C
0
0
B. f
f
= 375kHz
= 2.68kHz
CLK
CUTOFF
GAIN
(140:1, PIN 10 GND)
–90
–5
–30
–40
C. f
f
= 500kHz
= 10kHz
CLK
CUTOFF
+
(50:1, PIN 10 TO V ,
PINS 1-13 SHORTED)
–180
–270
–50
–60
–70
–80
–10
–15
V
f
= ±5V
S
PHASE
= 50kHz
CLK
f
= 1kHz
CUTOFF
+
(50:1, PIN 10 TO V ,
PINS 1-13 SHORTED)
V
T
= ±5V
= 25°C
S
A
T
A
= 25°C
0.2
0.4
0.6
0.8
1.0
0.1
1
10
50
FREQUENCY (kHz)
FREQUENCY (kHz)
LTC1164-5 • G01
LTC1164-5 • G02
3
LTC1164-5
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Passband Gain and Phase
vs Frequency
Passband Gain and Phase
vs Frequency
0
0
0
0
GAIN
–90
–5
–90
–5
PHASE
–180
–270
–360
–10
–15
–20
–180
–270
–360
–10
–15
–20
V
f
= ±5V
V
f
= ±5V
S
S
= 100kHz
= 1kHz
= 150kHz
CLK
CLK
f
f
= 1.07kHz
CUTOFF
CUTOFF
–
(100:1, PIN 10 TO V )
= 25°C
(140:1, PIN 10 TO GND)
= 25°C
T
T
A
A
0.2
0.4
FREQUENCY (kHz)
0.6
0.8
1.0
0.2
0.4
0.6
0.8
1.0
FREQUENCY (kHz)
LTC1164-5 • G03
LTC1164-5 • G04
Group Delay vs Frequency
Passband vs Frequency and fCLK
500
450
400
350
300
250
200
150
100
50
A. f
= 200kHz
= 4kHz
A. f
= 500kHz
CLK
CUTOFF
CLK
V
= ±7.5V
= 25°C
S
A
f
(BUTTERWORTH 100:1)
0.5
0
T
f
= 5kHz
B. f
f
C. f
f
D. f
f
E. f
f
= 300kHz
= 6kHz
CUTOFF
CLK
B. f
= 750kHz
CUTOFF
CLK
A
B
C
D E
F
(BESSEL 140:1)
= 5.36kHz
= 500kHz
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
CLK
f
= 10kHz
= 15kHz
= 20kHz
CUTOFF
CUTOFF
= 750kHz
CUTOFF
= 1MHz
CUTOFF
CLK
CLK
A
F. f
f
= 1.5MHz
CLK
= 30kHz
CUTOFF
V
= ±7.5V
S
B
50:1
= 25°C
T
A
0
0.1
1
10
30
0.5
2.5 3.5 4.5
5.5 6.5 7.5
1.5
FREQUENCY (kHz)
FREQUENCY (kHz)
LTC1164-5 • G06
LTC1164-5 • G05
Maximum Passband over
Temperature for VS = ±7.5V, 50:1
Passband vs Frequency and fCLK
A. f
f
B. f
f
C. f
f
D. f
f
= 200kHz
CUTOFF
CLK
= 2kHz
0.5
0
0.5
0
T
= 70°C
A
= 500kHz
CLK
= 5kHz
CUTOFF
T
A
= –40°C
A
B
C
D
E
= 750kHz
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
CLK
= 7.5kHz
= 10kHz
= 15kHz
CUTOFF
= 1MHz
CUTOFF
= 1.5MHz
CUTOFF
CLK
E. f
f
CLK
V
f
= ±7.5V
V
= ±7.5V
S
S
= 1.5MHz (50:1)
100:1
= 25°C
CLK
f
= 30kHz
T
CUTOFF
A
1
10
FREQUENCY (kHz)
30
0.1
1
10 20
FREQUENCY (kHz)
LTC1164-5 • G07
LTC1164-5 • G08
4
LTC1164-5
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Passband vs Frequency and fCLK
Passband vs Frequency and fCLK
A. f
f
= 150kHz
A. f
f
B. f
f
C. f
f
D. f
f
= 250kHz
= 5kHz
= 500kHz
CLK
CUTOFF
CLK
CUTOFF
= 1.07kHz
= 3.21kHz
= 5.36kHz
= 7.14kHz
= 10.71kHz
0.5
0
0.5
0
B. f
f
= 450kHz
CLK
CUTOFF
CLK
= 10kHz
= 15kHz
= 20kHz
CUTOFF
= 750kHz
CUTOFF
= 1MHz
CUTOFF
A
B
C
D
C. f
f
= 750kHz
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
CLK
CUTOFF
CLK
D. f
f
= 1MHz
CLK
CUTOFF
CLK
E. f
f
= 1.5MHz
CLK
CUTOFF
A
B
C
D
E
V
= ±7.5V, 140:1
V
= ±5V
S
S
(BESSEL RESPONSE)
= 25°C
50:1
T = 25°C
A
T
A
0.1
1
10
1
10
20
FREQUENCY (kHz)
FREQUENCY (kHz)
LTC1164-5 • G09
LTC1164-5 • G10
Maximum Passband over
Temperature for VS = ±5V, 50:1
Passband vs Frequency and fCLK
A. f
f
= 200kHz
CLK
= 2kHz
= 3kHz
= 5kHz
= 7.5kHz
= 10kHz
0.5
0
0.5
0
CUTOFF
T
= 70°C
A
B. f
f
= 300kHz
CLK
CUTOFF
T
A
= –40°C
A
B
C
D E
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
C. f
f
= 500kHz
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
CLK
CUTOFF
D. f
f
= 750kHz
CLK
CUTOFF
E. f
f
= 1MHz
CLK
CUTOFF
V
f
= ±5V
V
= ±5V
S
S
= 1MHz
100:1
= 25°C
CLK
f
= 20kHz
T
A
CUTOFF
1
10
20
0.1
1
10
FREQUENCY (kHz)
FREQUENCY (kHz)
LTC1164-5 • G011
LTC1164-5 • G12
Maximum Passband over
Temperature for VS = ±5V, 100:1
Passband vs Frequency and fCLK
A. f
f
B. f
f
C. f
f
D. f
f
= 250kHz
CUTOFF
CLK
= 5kHz
0.5
0
0.5
0
T
A
= 70°C
A
= 500kHz
CLK
= 10kHz
= 15kHz
= 20kHz
CUTOFF
= 750kHz
CUTOFF
= 1MHz
CUTOFF
T
= –40°C
A
B
C
D
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
CLK
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
CLK
V
f
= ±5V
V
= SINGLE 5V
S
S
= 1MHz (100:1)
= 10kHz
50:1
= 25°C
CLK
f
T
A
CUTOFF
1
10
20
0.5
1
10
FREQUENCY (kHz)
FREQUENCY (kHz)
LTC1164-5 • G14
LTC1164-5 • G13
5
LTC1164-5
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Maximum Passband over
Temperature for Single 5V, 50:1*
THD + Noise vs RMS Input, 50:1
THD + Noise vs RMS Input, 100:1
–40
–50
–60
–70
–80
–90
–100
–40
–50
–60
–70
–80
–90
–100
f
f
= 1kHz
CLK
f
f
= 1kHz
CLK
IN
IN
T
= 70°C
A
0.5
0
= 500kHz
= 500kHz
T
A
= –40°C
SINGLE 5V
±5V
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
SINGLE 5V
±5V
±7.5V
±7.5V
V
= SINGLE 5V
S
f
f
= 1MHz (50:1)
CLK
CUTOFF
= 20kHz
1
10
0.1
1
5
0.1
1
5
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
LTC1164-5 • G015
LTC1164-5 • G17
LTC1164-5 • G16
THD + Noise vs Frequency
THD + Noise vs Frequency
THD + Noise vs Frequency
–40
–50
–60
–70
–80
–90
–100
–40
–50
–60
–70
–80
–90
–100
–40
–50
–60
–70
–80
–90
–100
V
= 2V
V = 2V
IN RMS
V
= 1V
RMS
IN
RMS
IN
±7.5V, 50:1
= 1MHz
±7.5V, 100:1
f = 500kHz
CLK
±5V, 50:1
= 500kHz
f
f
CLK
CLK
(5 REPRESENTATIVE
UNITS)
(5 REPRESENTATIVE
UNITS)
(5 REPRESENTATIVE
UNITS)
1
10
20
1
2
3
4
5
1
5
10
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
LTC1164-5 • G18
LTC1164-5 • G19
LTC1164-5 • G20
THD + Noise vs Frequency
THD + Noise vs Frequency
THD + Noise vs Frequency
–40
–50
–60
–70
–80
–90
–100
–40
–50
–60
–70
–80
–90
–100
–50
–54
–58
–62
–66
–70
–74
–78
–82
–86
–90
V
= 0.7V
RMS
V
= 1V
V
V
f
= 2V
RMS
IN
IN
RMS
IN
S
SINGLE 5V SUPPLY
50:1, f = 500kHz
±5V, 100:1
= 500kHz
= ±7.5V, 140:1
f
= 750kHz
CLK
= 10kHz
CLK
CLK
f
C
(5 REPRESENTATIVE
UNITS)
f = 5.36kHz
C
(5 REPRESENTATIVE
UNITS)
(5 REPRESENTATIVE
UNITS)
1
5
10
1
2
3
4
5
0.5
1
5
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
LTC1164-5 • G22
LTC1164-5 • G21
LTC1164-5 • G23
*
See also Passband vs Frequency and f
and Maximum Passband for Single 5V, 50:1, for Two Ground Bias Levels.
for Single 5V, 50:1; THD + Noise vs RMS Input for Single 5V, 50:1;
CLK
6
LTC1164-5
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Maximum Passband for Single 5V,
50:1, for Two Ground Bias Levels
THD + Noise vs RMS Input for
Single 5V, 50:1
THD + Noise vs Input Voltage
–50
–54
–58
–62
–66
–70
–74
–78
–82
–86
–90
2.0
1.5
–40
–45
–50
–55
f
f
= 1kHz, 140:1
= 750kHz
T
f
= 70°C
A
CLK
f
= 1MHz
IN
CLK
CLK
=25°C
= 1MHz
T
A
1.0
GND = 2.5V
GND = 2V
0.5
V
= ±2.5V
S
0
–60
–65
GND = 2V
V
= ±5V
S
–0.5
–1.0
–1.5
–70
–75
GND = 2.5V
–2.0
–2.5
–3.0
–80
–85
–90
V
= ±7.5V
S
0.1
1
5
2
6
10 12 14 16 18 20 22
4
8
0.50
0.75
1.00
1.25
1.50
INPUT VOLTAGE (V
)
FREQUENCY (kHz)
RMS
INPUT (V
)
RMS
LTC1164-5 • G24
LTC1164-5 • TPC25
LTC1164-5 G26
Power Supply Rejection Ratio
vs Frequency
Phase Matching vs Frequency
10
8
10
A. BUTTERWORTH
(f /f = 100:1 OR 50:1)
MAXIMUM PHASE DIFFERENCE
BETWEEN ANY TWO UNITS
(SAMPLE OF 50 UNITS)
f
= 1kHz
CUTOFF
CLK CUTOFF
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
B. BESSEL (f
/f
= 140:1)
CLK CUTOFF
V
≥ ±5V
S
T
≤ 70°C
A
+
–
f
≤ 500KHz
CLK
V
V
6
4
A
B
2
0
0
0.4
0.6
0.8
1.0
1.2
0.2
20
100
1k
FREQUENCY (Hz)
50k
10k
FREQUENCY (FREQUENCY/f
)
CUTOFF
LTC1164-5 • G28
LTC1164-5 • G27
Power Supply Current vs Power
Supply Voltage
Transient Response
VIN = ±3V, 500Hz Square Wave
Transient Response
VIN = ±3V, 500Hz Square Wave
12
11
10
9
–55°C
25°C
8
125°C
7
6
5
4
3
1164-5 G30
1164-5 G31
2
500µs/DIV
500µs/DIV
1
BUTTERWORTH RATIO = 100:1
BESSEL RATIO = 140:1
fCLK = 700kHz
C = 5kHz
S = ±7.5V
0
f
f
V
CLK = 500kHz
C = 5kHz
S = ±7.5V
0
1
2
3
4
5
6
7
8
9
10
+
–
f
V
POWER SUPPLY (V OR V )
LTC1164-5 • G29
7
LTC1164-5
U
U
U
PI FU CTIO S
Power Supply (Pins 4, 12)
Clock Input (Pin 11)
TheV+ (Pin4)andtheV– (Pin12)shouldbebypassedwith
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.
WhenV+ isappliedbeforeV–,and V– canbemorepositive
than ground, a signal diode must be used to clamp V–.
Figures 1 and 2 show typical connections for dual and
single supply operation.
Any TTL or CMOS clock source with a square-wave output
and 50% duty cycle (±10%) is an adequate clock source
for the device. The power supply for 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
thehighlevelONtimeisgreaterthan0.5µs.Sinewavesare
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
rightsideoftheICpackagetoavoidcouplingintoanyinput
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.
–
V
1
2
3
4
5
6
7
14
13
12
11
10
9
*
V
V
0.1µF
IN
+
1k
CLOCK SOURCE
LTC1164-5
0.1µF
+
GND
DIGITAL SUPPLY
8
Table 1. Clock Source High and Low Threshold Levels
POWER SUPPLY
Dual Supply > ±3.4V
HIGH LEVEL
LOW LEVEL
* OPTIONAL (SEE TEXT)
+
V
1164-5 F01
OUT
≥ V /3
≤ 0.5V
+
–
Dual Supply ≤ ±3.4V
≥ V /3
≤ V + 0.5V
+
–
+
+
Figure 1. Dual Supply Operation for fCLK/fCUTOFF = 100:1
Single Supply V > 6.8V, V = 0V
≥ V • 0.65
≤ 0.5V + 1/2V
≤ 0.5V
+
–
+
Single Supply V < 6.8V, V = 0V
≥ V /3
1
2
3
4
5
6
7
14
13
12
11
10
9
Analog Ground (Pins 3, 5)
V
IN
The filter performance depends on the quality of the
analog signal ground. For either dual or single supply
operation, an analog ground plane surrounding the pack-
age is recommended. The analog ground plane should be
connected to any digital ground at a single 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 at least a 1µF
capacitor(Figure2). Forsingle5Voperationatthehighest
fCLK of 1MHz, Pins 3 and 5 should be biased at 2V. This
minimizes passband gain and phase variations (see Typi-
cal Performance Characteristics curves: Maximum Pass-
band for Single 5V, 50:1; and THD + Noise vs RMS Input
for Single 5V, 50:1).
1k
+
LTC1164-5
CLOCK SOURCE
5V ≤ V ≤ 16V
0.1µF
+
GND
10k
8
DIGITAL SUPPLY
+
10k
1µF
V
OUT
1164-5 F02
Figure 2. Single Supply Operation for fCLK/fCUTOFF = 100:1
8
LTC1164-5
U
U
U
PI FU CTIO S
Butterworth/Bessel (Pin 10)
is well within the filter’s output swing. Pin 6 is an interme-
diate filter output providing an unspecified 6th order
lowpass filter. Pin 6 should not be loaded.
The DC level at Pin 10 determines the ratio of the clock
frequency to the cutoff frequency of the filter. Pin 10 at V+
givesa50:1ratioandaButterworthresponse(pins1to13
are shorted for 50:1 only). Pin 10 at V– gives a 100:1
Butterworth response. Pin 10 at ground gives a Bessel
response and a ratio of 140:1. For single supply operation
theratiois50:1whenPin10isatV+ (pins1to13shorted),
100:1 when Pin 10 is at ground, and 140:1 when at 1/2
supply. When Pin 10 is not tied to ground, it should be
bypassed to analog ground with a 0.1µF capacitor. If the
DC level at Pin 10 is switched mechanically or electrically
at slew rates greater than 1V/µs while the device is
operating, a 10k resistor should be connected between
Pin 10 and the DC source.
–
LT1056
1k
+
1164-5 F03
Figure 3. Buffer for Filter Output
External Connection (Pins 7, 14 and 1, 13)
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. When the clock to cutoff frequency ratio is
set at 50:1, Pin 1 should be shorted to Pin 13; if not, the
passbandwillexhibit1dBofgainpeakinganditwilldeviate
from a Butterworth response. Pin 1 is the inverting input
ofaninternalopampanditshouldpreferablybe0.2inches
away from any other circuit trace.
Filter Input (Pin 2)
The input pin is connected internally through a 100k
resistor tied to the inverting input of an op amp.
Filter Output (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 harmonic distor-
tionofthefilter.Whenevaluatingthedevice’sdistortionan
output buffer is required. A noninverting buffer, Figure 3,
can be used provided that its input common mode range
NC (Pin 8)
Pin 8 is not connected to any internal circuit point on the
device and should be preferably tied to analog ground.
U
W U U
APPLICATIO S I FOR ATIO
Table 2. Output Clock Feedthrough
Clock Feedthrough
V
50:1
60µV
100:1
60µV
S
Clock feedthrough is defined as, the RMS value of the
clock frequency and its harmonics that are present at the
filter’s output pin (Pin 9). The clock feedthrough is tested
with the input pin (Pin 2) grounded and, it depends on PC
board layout and on the value of the power supplies. With
properlayouttechniquesthevaluesoftheclockfeedthrough
are shown in Table 2.
±2.5V
±5V
RMS
RMS
100µV
150µV
200µV
500µV
RMS
RMS
RMS
RMS
±7.5V
Note: The clock feedthrough at ±2.5V supplies is imbedded in the
wideband noise of the filter. The clock waveform is a square wave.
9
LTC1164-5
U
W
U U
APPLICATIO S I FOR ATIO
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 (Pin 9). This R/C will completely eliminate any
switching transient.
Aliasing
Aliasing is an inherent phenomenon of sampled data
systems and it occurs when input frequencies close to the
sampling frequency are applied. For the LTC1164-5 case
at 100:1, an input signal whose frequency is in the range
of fCLK ±2.5% will be aliased back into the filter’s pass-
band. If, for instance, an LTC1164-5 operating with a
100kHz clock and 1kHz cutoff frequency receives a 98kHz
10mV input signal, a 2kHz 56µV alias signal will appear at
its output. When the LTC1164-5 operates with a clock-to-
cutoff frequency of 50:1, aliasing occurs at twice the clock
frequency. Table 4 shows details.
Wideband Noise
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
Table 4. Aliasing Data (fCLK = 100kHz, VS = ±5V)
INPUT FREQUENCY
(V = 1V
OUTPUT LEVEL
(Relative to Input)
OUTPUT FREQUENCY
(Aliased Frequency)
)
RMS
IN
(f /f ) = 100:1, f
= 1kHz
CLK
C
CUTOFF
97.0kHz
97.5kHz
98.0kHz
98.5kHz
99.0kHz
99.5kHz
–102.0dB
–65.0dB
–45.0dB
–23.0dB
–4.0dB
3.0kHz
2.5kHz
2.0kHz
1.5kHz
1.0kHz
0.5kHz
LTC1164-5widebandnoiseat±2.5Vsupplyis100µVRMS
,
95µVRMS of which have frequency contents from DC up to
the filter’s cutoff frequency. The total wideband noise
(µRMS)isnearlyindependentofthevalueoftheclock.The
clock feedthrough specifications are not part of the wide-
band noise.
–0.3dB
(f /f ) = 50:1, f
= 2kHz
CLK
C
CUTOFF
197.0kHz
197.5kHz
198.0kHz
198.5kHz
199.0kHz
199.5kHz
–23.0dB
3.0kHz
2.5kHz
2.0kHz
1.5kHz
1.0kHz
0.5kHz
–12.0dB
–5.0dB
–1.8dB
–1.0dB
–0.8dB
Speed Limitations
The LTC1164-5 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 in Table 3.
Table 5. Transient Response of LTC Lowpass Filters
DELAY
TIME*
(SEC)
RISE
TIME**
(SEC)
SETTLING OVER-
TIME***
(SEC)
Table 3. Maximum VIN vs VS and fCLK
SHOOT
(%)
LOWPASS FILTER
POWER SUPPLY
V = ±7.5V
MAXIMUM f
MAXIMUM V
IN
CLK
LTC1064-3 Bessel
LTC1164-5 Bessel
LTC1164-6 Bessel
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
1.5MHz
1V
(f > 35kHz)
RMS IN
C
C
C
C
C
C
C
C
C
S
0.5V
(f > 250kHz)
RMS IN
V = ±7.5V
1.0MHz
1.0MHz
1.0MHz
3V
0.7V
(f > 25kHz)
RMS IN
(f > 250kHz)
RMS IN
S
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
V = ±5.0V
S
2.5V
0.5V
(f > 25kHz)
RMS IN
(f > 100kHz)
RMS IN
LTC1164-5 Butterworth
LTC1164-6 Elliptic
0.80/f
0.85/f
0.48/f
0.54/f
2.40/f
4.30/f
11
18
C
C
C
C
C
C
Single 5V
0.7V
(f > 25kHz)
RMS IN
0.5V (f > 100kHz)
RMS IN
LTC1064-4 Elliptic
LTC1064-1 Elliptic
0.90/f
0.85/f
0.54/f
0.54/f
4.50/f
6.50/f
20
20
C
C
C
C
C
C
* To 50% ±5%, ** 10% to 90% ±5%, *** To 1% ±0.5%
10
LTC1164-5
U
TYPICAL APPLICATIO S
Single 5V, IS = 5.2mA, 16th Order Clock-Tunable Lowpass Filter,
fCLK/fCUTOFF = 60:1, –75dB Attenuation at 2.3 fCUTOFF
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
LTC1164-5
IC1
LTC1164-5
IC2
V
IN
5V
5V
0.1µF
0.1µF
15k
10k
5V
5V
V
OUT
+
8
8
1µF
1k
f
1164-5 F04
CLK
Gain vs Frequency
THD + Noise vs Frequency
10
0
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
V
V
f
= SINGLE 5V
S
= 0.5V
IN
RMS
= 600kHz
–10
–20
–30
–40
–50
–60
–70
–80
–90
CLK
f
= 10kHz
C
V
f
f
= SINGLE 5V
S
= 600kHz
CUTOFF
CLK
= 10kHz
1
10
FREQUENCY (kHz)
30
1
5
10
FREQUENCY (kHz)
LTC1164-5 • TA04
LTC1164-5 • TA03
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
J Package
14-Lead CERDIP (Narrow 0.300, Hermetic)
(LTC DWG # 05-08-1110)
0.840
(21.336)
CORNER LEADS OPTION
(4 PLCS)
0.005
(0.127)
MIN
MAX
16
10
15
14
12
11
9
8
13
0.023 – 0.045
(0.584 – 1.143)
HALF LEAD
OPTION
0.220 – 0.310
(5.588 – 7.874)
0.025
(0.635)
RAD TYP
0.045 – 0.068
(1.143 – 1.727)
FULL LEAD
OPTION
2
3
5
1
4
6
7
0.200
(5.080)
MAX
0.300 BSC
(0.762 BSC)
0.015 – 0.060
(0.380 – 1.520)
0.008 – 0.018
(0.203 – 0.457)
0° – 15°
0.045 – 0.068
(1.143 – 1.727)
0.100 ± 0.010
(2.540 ± 0.254)
0.125
(3.175)
MIN
0.014 – 0.026
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
(0.360 – 0.660)
J16 1197
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.
11
LTC1164-5
U
TYPICAL APPLICATIO S
8th Order Butterworth Lowpass Filter
fCLK/fC = 50:1
8th Order Linear Phase Lowpass Filter
fCLK/fC = 140:1
8th Order Butterworth Lowpass Filter
fCLK/fC = 100:1
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
1
2
3
4
5
6
7
14
13
12
11
10
9
V
V
IN
IN
V
IN
–
–
V
V
–
0.1µF
V
+
0.1µF
+
0.1µF
LTC1164-5
LTC1164-5
V
V
f
CLK
f
CLK
+
0.1µF
LTC1164-5
V
f
+
CLK
+
+
0.1µF
V
V
0.1µF
V
V
OUT
OUT
8
OUT
8
8
1164-5 TA06
1164-5 TA07
1164-5 TA05
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
N Package
14-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.770*
(19.558)
MAX
0.300 – 0.325
(7.620 – 8.255)
0.045 – 0.065
(1.143 – 1.651)
0.130 ± 0.005
(3.302 ± 0.127)
14
13
12
11
10
9
8
7
0.020
(0.508)
MIN
0.255 ± 0.015*
(6.477 ± 0.381)
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
+0.035
1
2
3
5
6
4
0.325
0.005
(0.125)
MIN
0.100 ± 0.010
(2.540 ± 0.254)
–0.015
0.125
(3.175)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
+0.889
8.255
(
)
–0.381
N14 1197
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
SW Package
16-Lead Plastic Small Outline (Wide 0.300)
(LTC DWG # 05-08-1620)
0.291 – 0.299**
(7.391 – 7.595)
0.398 – 0.413*
(10.109 – 10.490)
0.037 – 0.045
(0.940 – 1.143)
0.093 – 0.104
(2.362 – 2.642)
15 14
12
10
11
9
16
13
0.010 – 0.029
(0.254 – 0.737)
× 45°
0° – 8° TYP
0.050
(1.270)
TYP
0.394 – 0.419
(10.007 – 10.643)
NOTE 1
0.004 – 0.012
(0.102 – 0.305)
0.009 – 0.013
NOTE 1
(0.229 – 0.330)
0.014 – 0.019
0.016 – 0.050
(0.356 – 0.482)
TYP
(0.406 – 1.270)
NOTE:
1. 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
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
2
3
5
7
8
1
4
6
S16 (WIDE) 0396
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
Operates from a Single 3.3V to ±5V Supply
LTC1069-1
Low Power, 8th Order Elliptic Lowpass Filter
Very Low Power, 8th Order Elliptic Lowpass Filter
LTC1069-6
Optimized for 3V/5V Single Supply Operation, Consumes 1mA at 3V
11645as, sn11645 LT/TP 1098 2K REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
LINEAR TECHNOLOGY CORPORATION 1993
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
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