LTC1164-6CN#PBF [Linear]
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;
| 型号： | LTC1164-6CN#PBF |
| 厂家： | 
Linear |
| 描述： | 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 |
| 文件： | 总12页 (文件大小：312K) |
| 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
DESCRIPTIO
EATURE
S
F
■
The LTC1164-6 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 in a
14-Pin Package
■
■
■
■
■
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
Operates at Single 5V Supply with 1VRMS
Input Range
Operates up to ±8V Supplies
TTL/CMOS Compatible Clock Input
No External Components
current while keeping wideband noise below 110µVRMS
.
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.
■
■
■
The LTC1164-6 provides an elliptic lowpass rolloff with
stopband attenuation of 64dB at 1.44 fCUTOFF and an fCLK
-
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.
O U
PPLICATI
S
A
■
■
■
Anti-Aliasing Filters
Battery-Operated Instruments
Telecommunication Filters
U
O
TYPICAL APPLICATI
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
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 ................................... – 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
TOP VIEW
ORDER PART
ORDER PART
NUMBER
NUMBER
NC
CONNECT 2
NC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
CONNECT 2
NC
14
13
12
11
10
9
NC
V
V
IN
IN
–
–
GND
V
V
GND
LTC1164-6CN
LTC1164-6CJ
LTC1164-6MJ
LTC1164-6CS
+
+
V
NC
CLK
V
GND
NC
CLK
ELL/BESS
GND
LP6
ELL/BESS
NC
V
OUT
LP6
NC
8
CONNECT 1
CONNECT 1
V
OUT
J PACKAGE
N PACKAGE
14-LEAD CERAMIC DIP 14-LEAD PLASTIC DIP
S PACKAGE
16-LEAD PLASTIC SOL
TJMAX = 150°C, θJA = 65°C/W (J)
TJMAX = 110°C, θJA = 85°C/W
T
JMAX = 110°C, θJA = 65°C/W (N)
ELECTRICAL CHARACTERISTICS
VS = ±7.5V, RL = 10k, TA = 25°C, fCLK = 400kHz, TTL or CMOS level (maximum clock rise or fall time ≤ 1µs) and all gain
measurements are referenced to passband gain, unless otherwise specified. (fCLK/fCUTOFF) = 4kHz 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
●
●
–3.50
–3.00
–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
●
●
–69
–69
–3.50
–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
–3.30
–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
Maximum f
(Table 3)
V ≥ ±7.5V
1.5
1.0
1.0
MHz
MHz
MHz
CLK
S
V ≤ ±5V
S
V = Single 5V, AGND = 2V
S
2
LTC1164-6
ELECTRICAL CHARACTERISTICS
VS = ±7.5V, RL = 10k, TA = 25°C, fCLK = 400kHz, TTL or CMOS level (maximum clock rise or fall time ≤ 1µs) and all gain
measurements are referenced to passband gain, unless otherwise specified. (fCLK/fCUTOFF) = 4kHz at 100:1 and 8kHz at 50:1.
PARAMETER
Clock Feedthrough
CONDITIONS
Input at GND, f = f , Square Wave
MIN
TYP
MAX
UNITS
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
Wideband Noise
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
30
40
70
Output DC Voltage Swing
V = ±2.375V
●
●
●
±1.25
±3.70
±5.40
±1.50
±4.10
±5.90
V
V
V
S
V = ±5V
S
V = ±7.5V
S
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
The
● denotes specifications which apply over the full operating
may cause latch-up. It is recommended that no sources operating from
external supplies be applied prior to power-up of the LTC1164-6.
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which life of
Note 3: All gains are measured relative to passband gain.
Note 4: The cutoff frequency of the filter is abbreviated as f
the device may be impaired.
or f .
C
CUTOFF
+
–
Note 2: Connecting any pin to voltages greater than V or less than V
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Stopband Gain vs Frequency
(Elliptic Response)
Stopband Gain vs Frequency
(Elliptic Response)
10
10
0
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
CLK
f
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 22
20
2
4
FREQUENCY (kHz)
FREQUENCY (kHz)
1164-6 G01
1164-6 G02
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
C
B. RESPONSE WITH AN
EXTERNAL SINGLE
= 5kHz
–90
–10
–20
–30
–40
–50
–60
–70
–80
–90
(f /f ) = 160:1
CLK
C
POLE LOWPASS RC
0.5
–135
–180
–225
–270
–315
–360
–405
–450
(PIN 10 AT GND)
FILTER (fAT 10kHz)
– 3dB
T
= 25°C
A
0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
V
= ±5V
S
f
f
= 500kHz
CLK
C
A
B
= 5kHz
(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
PHASE
0
–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
D. T = –40°C
A
V
= ±5V
S
f
f
= 500kHz
CLK
C
V
= ±5V
S
= 5kHz
V
= ±5V
S
f
f
= 800kHz
CLK
C
(f /f ) = 100:1
CLK
C
f
f
= 1MHz
–
CLK
C
= 5kHz
(PIN 10 AT V )
= 25°C
= 10kHz
(f /f ) = 160:1
CLK
C
T
A
(f /f ) = 100:1
CLK
C
(PIN 10 AT GND)
= 25°C
(10 REPRESENTA-
TIVE UNITS)
–
(PIN 10 AT V )
T
A
1
5
10
1
2
3
4
5
0.4
1.0
2.2
2.8
3.4
4.0
1.6
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
1164-6 G07
1164-6 G11
1164-6 G05
Passband Gain and Phase vs
Frequency and fCLK
Passband vs Frequency and fCLK
0
3
2
2.0
1.5
A. RESPONSE WITHOUT
EXTERNAL SINGLE
POLE RC FILTER
A. f
B. f
C. f
D. f
= 400kHz
CUTOFF
CLK
V
= ±5V
S
–45
f
= 4kHz
(f /f ) = 100:1
CLK
C
–90
–
= 600kHz
1
A
B
CLK
(PIN 10 AT V )
= 25°C
1.0
B. RESPONSE WITH AN
EXTERNAL SINGLE
f
= 6kHz
CUTOFF
–135
–180
–225
–270
–315
–360
–405
–450
–495
–540
0
T
A
= 800kHz
0.5
CLK
–1
–2
–3
–4
–5
–6
–7
–8
–9
POLE LOWPASS RC
f
= 8kHz
CUTOFF
PHASE
A
FILTER (fAT 10kHz)
– 3dB
0
= 1MHz
f = 10kHz
CUTOFF
CLK
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
B
V
= ±5V
S
f
f
= 250kHz
CLK
C
= 5kHz
(f /f ) = 50:1
CLK
C
–
A
(PIN 10 AT V )
T
B
C
D
= 25°C
A
1
2
3
4
5
1
5
10
FREQUENCY (kHz)
INPUT FREQUENCY (kHz)
1164-6 G06
1164-6 G08
4
LTC1164-6
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Maximum Passband over
Temperature
Passband vs Frequency and fCLK
2.0
1.5
2.0
1.5
A. f
B. f
C. f
= 250kHz
CUTOFF
CLK
f
= 5kHz
= 500kHz
CLK
1.0
1.0
f
= 10kHz
= 20kHz
CUTOFF
= 1MHz
T
= 70°C
A
0.5
CLK
0.5
f
CUTOFF
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
S
–2.0 EXTERNAL RC
(f /f ) = 50:1
CLK
C
+
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
700
600
500
400
300
200
250
200
150
100
50
A.
f
= 250kHz, (f /f ) = 50:1
V = ±5V, V = 1V
S IN RMS
CLK
CLK
C
f
= 800kHz
CLK
–
WITH EXTERNAL RC LOWPASS
(20k RESISTOR PIN 14 TO V )
= 500kHz, f = 5kHz
(f /f ) = 160:1
CLK
C
FILTER= 1(f0kHz)
f
CLK
C
C
f
= 5kHz
C
A
B
B.
f
= 500kHz
(f /f ) = 100:1, T = 25°C
CLK C A
CLK
(f/f ) = 100:1
(5 REPRESENTATIVE UNITS)
CLK
C
V
f
= ±5V
= 5kHz
= 25°C
S
100
C
T
A
0
0
1
2
3
4
5
1
2
3
4
5
1
3
4
5
7
8
9
10 11
2
6
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
1164-6 G13
1164-6 G12
1164-6 G22
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
V
V
f
= ±5V
= 1V
CLK
= 5kHz
V
f
= ±5V, V = 1V
,
V
f
= SINGLE 5V, V = 0.7V
IN RMS
S
IN
S
IN
RMS
S
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
= 500kHz, f = 10kHz,
= 500kHz, f = 5kHz,
RMS
CLK
C
CLK
C
= 800kHz
(f /f ) = 50:1, T = 25°C,
(f /f ) = 100:1, T = 25°C
CLK C A
CLK
C
A
f
WITH EXTERNAL RC LOWPASS
FILTER (f = 20kHz)
(5 REPRESENTATIVE UNITS)
C
(f /f ) = 160:1
CLK
C
– 3dB
T
= 25°C
(5 REPRESENTATIVE UNITS)
A
0.5
1
5
1
5
10
1
2
3
4
5
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
1164-6 G14
1164-6 G23
1164-6 G16
5
LTC1164-6
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Power Supply Current vs Power
Supply Voltage
THD + Noise vs RMS Input
(Elliptic Response)
THD + Noise vs RMS Input for
Single 5V (Elliptic Response)
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
12
11
10
9
(f /f ) = 100:1 OR 50:1
CLK
C
(f /f ) = 100:1 OR 50:1
CLK
IN
C
f
= 1kHz, T = 25°C
A
–55°C
IN
f
= 1kHz, T = 25°C
A
A
B
25°C
8
125°C
7
V
= ±5V
S
6
5
4
3
V
)
= ±7.5V
S
2
A. GND = 2.5V
B. GND = 2V
1
0
0.1
1
2
0
1
2
3
4
5
6
7
8
9
10
0.1
1
5
+
–
INPUT (V
POWER SUPPLY (V OR 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
fCLK = 800kHz, (fCLK/fC) = 160:1, fCUTOFF = 5kHz
LINEAR PHASE RESPONSE
VS = ±7.5V, VIN = ±3V 100Hz SQUARE WAVE
fCLK = 500kHz, (fCLK/fC) = 100:1, fCUTOFF = 5kHz
ELLIPTIC RESPONSE
U
U
U
(14-Lead Dual-In-Line Package)
PI FU CTIO S
Power Supply Pins (4, 12)
1 and 2 show typical connections for dual and single
supply operation.
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.
When V+ is applied before V– and V– could go above
ground, a signal diode must be used to clamp V–. Figures
Clock Input Pin (11)
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
6
LTC1164-6
U
U
U
PI FU CTIO S
(14-Lead Dual-In-Line Package)
Analog Ground Pins (3, 5)
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.
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
f
CLK of 1MHz, pins 3 and 5 should be biased at 2V. This
–
V
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).
1
2
3
4
5
6
7
14
13
12
11
10
9
*
V
V
0.1µF
IN
1k
+
CLOCK SOURCE
LTC1164-6
Elliptic/Linear Phase Select Pin (10)
0.1µF
+
GND
8
The DC level at this pin selects the desired filter response,
ellipticorlinearphaseanddeterminestheratiooftheclock
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 provides 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 slew rates greater than 1V/
µs while the device is operating, a 10k resistor should be
connected between pin 10 and the DC source.
DIGITAL SUPPLY
* OPTIONAL
V
OUT
1164-6 F01
Figure 1. Dual Supply Operation for fCLK/fCUTOFF = 100:1
1
2
3
4
5
6
7
14
13
12
11
10
9
V
IN
1k
+
V
LTC1164-6
CLOCK SOURCE
0.1µF
+
GND
DIGITAL SUPPLY
10k
10k
8
+
1µF
Filter Input Pin (2)
V
OUT
1164-6 F02
The input pin is connected internally through a 50k resis-
tor tied to the inverting input of an op amp.
Figure 2. Single Supply Operation for fCLK/fCUTOFF = 100:1
Table 1. Clock Source High and Low Threshold Levels
Filter Output Pins (9, 6)
POWER SUPPLY
HIGH LEVEL
≥ 2.18V
≥ 1.45V
≥ 0.73V
≥ 7.80V
≥ 1.45V
LOW LEVEL
≤ 0.5V
≤ 0.5V
≤ –2.0V
≤ 6.5V
≤ 0.5V
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,
Dual Supply = ±7.5V
Dual Supply = ±5V
Dual Supply = ±2.5V
Single Supply = 12V
Single Supply = 5V
7
LTC1164-6
U
U
U
(14-Lead Dual-In-Line Package)
PI FU CTIO S
can be used provided that its input common-mode range
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.
External Connection 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.
–
NC Pin (1, 8, 13)
1k
+
Pins 1, 8, and 13 are not connected to any internal circuit
point on the device and should preferably be tied to analog
ground.
LT1006, f < 5kHz
C
LT1200, f > 5kHz
C
1164-6 F03
Figure 3. Buffer for Filter Output
O U
W
U
PPLICATI
A
S I FOR ATIO
The gain peaking can approximate a sin χ/χ correction for
someapplications.(SeeTypicalPerformanceCharacteris-
tics curve, Passband vs Frequency and fCLK at fCLK/fC =
50:1.)
Passband Response
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
When the LTC1164-6 operates with a single 5V supply and
its 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.
Clock Feedthrough
90% fCUTOFF
.
Clockfeedthroughisdefinedas,theRMSvalueoftheclock
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.
Table 2. Typical Passband Ripple with Single 5V Supply
(fCLK/fC) = 100:1, GND = 2V, 30kHz, Fixed Single Pole, Lowpass
RC Filter at Pin 9 (See Typical Applications)
PASSBAND
FREQUENCY
PASSBAND GAIN
(REFERENCED TO 0dB)
f
= 1kHz
f
= 10kHz
CUTOFF
CUTOFF
T = 25°C
A
T = 0°C
A
T = 25°C
A
T = 70°C
A
% of f
(dB)
0.00
(dB)
0.00
0.00
(dB)
0.00
0.01
–0.01
–0.02
–0.01
0.01
(dB)
0.00
0.01
0.01
0.02
0.03
0.05
0.07
0.02
CUTOFF
10
20
30
40
50
60
70
80
Table 3. Clock Feedthrough
–0.02
–0.05
–0.10
–0.13
–0.15
–0.18
–0.25
–0.39
–2.68
V
50:1
60µV
100µV
150µV
100:1
60µV
S
– 0.01
– 0.02
– 0.03
– 0.01
– 0.01
– 0.08
– 0.23
– 2.79
±2.5V
±5V
±7.5V
RMS
RMS
200µV
500µV
RMS
RMS
RMS
RMS
0.01
Note: The clock feedthrough at ±2.5V supplies is imbedded in the wideband
noise of the filter. (The clock signal is a square wave.)
–0.05
–0.18
–2.74
90
– 0.05
– 2.68
f
CUTOFF
8
LTC1164-6
O U
W
U
PPLICATI
S I FOR ATIO
A
Table 4. Maximum VIN vs VS and fCLK
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.
POWER SUPPLY
MAXIMUM f
MAXIMUM V
IN
CLK
±7.5V
1.5MHz
1MHz
1V
3V
0.7V
(f > 35kHz)
RMS IN
(f > 25kHz)
RMS IN
≥1MHz
(f > 250kHz)
RMS IN
±5V
1MHz
1MHz
2.5V
0.5V
(f > 25kHz)
RMS IN
(f > 100kHz)
RMS IN
Single 5V
1MHz
1MHz
0.7V
0.5V
(f > 25kHz)
RMS IN
(f > 100kHz)
RMS IN
Table 5. Aliasing (fCLK = 100kHz)
INPUT FREQUENCY OUTPUT LEVEL
OUTPUT FREQUENCY
(Aliased Frequency)
(kHz)
Wideband Noise
(V = 1V
)
(Relative to Input)
(dB)
IN
RMS
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
(kHz)
/f = 100:1, f = 1kHz
CUTOFF
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
LTC1164-6widebandnoiseat ±2.5Vsupplyis100µVRMS
,
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.
99.5 (or 100.5)
– 0.5
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
Speed Limitations
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.
Table 6. Transient Response of LTC Lowpass Filters
DELAY
TIME*
(SEC)
RISE
SETTLING OVER-
TIME** TIME*** SHOOT
Aliasing
LOWPASS FILTER
(SEC)
(SEC)
(%)
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
and 1kHz cutoff frequency receives a 98.5kHz, 10mVRMS
input signal, a 1.5kHz, 10µVRMS alias signal will appear at
itsoutput. WhentheLTC1164-6operateswithaclock-to-
cutoff frequency of 50:1, aliasing occurs at twice the clock
frequency. Table 5 shows details.
LTC1064-3 Bessel
0.50/f
0.34/f
0.34/f
0.34/f
0.80/f
0.85/f
0.5
0
C
C
C
C
C
C
C
LTC1164-5 Linear Phase
LTC1164-6 Linear Phase
0.43/f
C
0.43/f
1.15/f
1
C
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
LTC1164-5 Butterworth
0.80/f
0.48/f
2.40/f
11
C
C
C
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
18
20
20
C
C
C
C
C
C
C
C
6.50/f
C
* To 50% ±5%, ** 10% to 90% ±5%, *** To 1% ±0.5%
9
LTC1164-6
U
O
TYPICAL APPLICATI S
8th Order Elliptic Lowpass Filter
(fCLK/fC) = 50:1
1
2
14
13
12
11
10
9
V
+
IN
+
V
NOTES:
3
4
5
6
7
–
1. OPTIONAL OUTPUT BUFFER
V
1/2πRC = 2 × f
.
CUTOFF
0.1µF
LTC1164-6
f
V
–
+
CLK
+
2. PINS 1, 8, 13 CAN BE GROUNDED
OR LEFT FLOATING.
0.1µF
LT1006
V
R
V
OUT
1164-6 TA06
8
C
–
V
8th Order Elliptic Lowpass Filter
(fCLK/fC) = 100:1
8th Order Linear Phase Lowpass Filter
(fCLK/fC) = 160:1
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
V
V
V
IN
IN
–
–
V
V
+
+
LTC1164-6
0.1µF
f
LTC1164-6
0.1µF
f
CLK
V
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
5V
5V
13
12
11
10
9
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
0.1µF
51.1k
–
+
= 1MHz
f
= 20kHz.
–3dB
V
LT1200
4
OUT
10k
10k
3. THD + NOISE ≤ –70dB,
1V ≤ V ≤ 3V , f = 1kHz.
P-P
IN
P-P IN
1k
8
1000pF
510pF
1164-6 TA09
0.1µF
6.65k
10
LTC1164-6
U
O
TYPICAL APPLICATI S
8th Order Low Power, Clock-Tunable Elliptic Filter with
Active RC Input Anti-Aliasing 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
= 1kHz
1/2
C
0.1µF
V
V
OUT
ATTENUATION AT 10kHz = –48dB
LT1013
+
NOTES:
C2
0.001µF
R2
97.6k
8
R1
C1
1. CLOCK-TUNABLE OVER ONE DECADE
OF CUTOFF FREQUENCY.
16.9k
0.0047µF
2. BOTH INPUT AND OUTPUT RC ACTIVE
FILTERS ARE 0.1dB CHEBYSHEV FILTERS
WITH 1kHz RIPPLE BANDWIDTH.
100Hz ≤ f ≤ 1kHz
C
10kHz ≤ f
≤ 100kHz
CLK
f = 1kHz
C
ATTENUATION AT 10kHz = –30dB
1164-6 TA10
Single 5V, 16th Order Lowpass Filter
fCUTOFF = 10kHz
R1
789Ω
V
IN
C1
1
2
3
4
5
6
7
1
2
3
4
5
6
7
14
13
12
11
10
9
14
0.01µF
13
12
11
10
9
LTC1164-6
IC1
LTC1164-6
IC2
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
V
= SINGLE 5V, I = 5mA TYP
S
S
16TH ORDER LOWPASS FILTER
FIXED f
, f
= 540kHz
CUTOFF CLK
f
= 10kHz
CUTOFF
(f /f ) = 54:1
CLK
C
1/2πR1C1 = 1/2πR2C2 = 2f
CUTOFF
THD + Noise vs Frequency
Gain vs Frequency
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
10
0
V
= SINGLE 5V
IS = 5mA, 16TH ORDER
ELLIPTIC LOWPASS
S
–10
–20
–30
–40
–50
V
= 0.5V
CLK
= 10kHz
IN
RMS
f
f
= 540kHz
C
V
S
= SINGLE 5V
S
–60
I
= 5mA, 16TH ORDER
ELLIPTIC LOWPASS
–70
–80
–90
f
f
= 540kHz
= 10kHz
CLK
CUTOFF
1
10
FREQUENCY (kHz)
30
1
5
10
FREQUENCY (kHz)
1164-6 TA05
1164-6 TA04
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
LTC1164-6
U
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTIO
J Package
14-Lead Ceramic DIP
0.785
0.200
(5.080)
MAX
(19.939)
MAX
0.005
(0.127)
MIN
0.290 – 0.320
(7.366 – 8.128)
14
13
12
11
10
9
8
0.015 – 0.060
(0.381 – 1.524)
0.220 – 0.310
0.025
(5.588 – 7.874)
(0.635)
RAD TYP
0.008 – 0.018
0° – 15°
(0.203 – 0.460)
2
3
4
5
6
1
7
0.098
(2.489)
MAX
0.385 ± 0.025
0.038 – 0.068
0.100 ± 0.010
(2.540 ± 0.254)
0.125
(3.175)
MIN
(9.779 ± 0.635)
(0.965 – 1.727)
0.014 – 0.026
J14 0392
(0.360 – 0.660)
N Package
14-Lead Plastic DIP
0.770
0.065
(19.558)
MAX
(1.651)
TYP
0.300 – 0.325
(7.620 – 8.255)
0.045 – 0.065
(1.143 – 1.651)
0.015
(0.380)
MIN
14
13
12
11
10
9
8
7
0.130 ± 0.005
(3.302 ± 0.127)
0.260 ± 0.010
(6.604 ± 0.254)
0.009 – 0.015
(0.229 – 0.381)
+0.025
1
2
3
5
6
4
0.325
–0.015
0.075 ± 0.015
(1.905 ± 0.381)
0.018 ± 0.003
(0.457 ± 0.076)
0.125
(3.175)
MIN
+0.635
8.255
(
)
–0.381
0.100 ± 0.010
(2.540 ± 0.254)
S Package
16-Lead Plastic SOL
0.398 – 0.413
(10.109 – 10.490)
0.291 – 0.299
(7.391 – 7.595)
15 14
12
10
9
16
13
11
0.037 – 0.045
(0.940 – 1.143)
0.093 – 0.104
(2.362 – 2.642)
0.005
0.010 – 0.029
(0.254 – 0.737)
× 45°
(0.127)
RAD MIN
0° – 8° TYP
0.394 – 0.419
(10.007 – 10.643)
SEE NOTE
0.050
(1.270)
TYP
0.004 – 0.012
(0.102 – 0.305)
0.009 – 0.013
(0.229 – 0.330)
SEE NOTE
0.014 – 0.019
0.016 – 0.050
(0.406 – 1.270)
(0.356 – 0.482)
TYP
NOTE:
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.
2
3
5
7
8
1
4
6
SOL16 0392
LT/GP 0293 10K REV 0
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
12
●
●
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
LINEAR TECHNOLOGY CORPORATION 1993
相关型号：
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
©2020 ICPDF网 联系我们和版权申明