LTC1560-1CS8#PBF [Linear]
LTC1560-1 - 1MHz/500kHz Continuous Time Low Noise, Lowpass Elliptic Filter; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C;型号: | LTC1560-1CS8#PBF |
厂家: | Linear |
描述: | LTC1560-1 - 1MHz/500kHz Continuous Time Low Noise, Lowpass Elliptic Filter; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C LTE 光电二极管 有源滤波器 |
文件: | 总8页 (文件大小:212K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LTC1560-1
1MHz/500kHz
Continuous Time,
Low Noise, Lowpass Elliptic Filter
either 500kHz (Pin 5 to V+) or 1MHz (Pin 5 to V–). When
programmed for 1MHz, the passband ripple is typically
±0.2dB up to 0.55fCUTOFF and ±0.3dB to 0.9fCUTOFF. The
transition band gain is –24dB at 1.4fCUTOFF and –51dB at
2fCUTOFF.Stopbandattenuationis63dBat2.43fCUTOFF and
above, remaining at least 60dB to 10MHz with proper
board layout. When the LTC1560-1 is programmed for
FEATURES
■
5th Order, 1MHz Elliptic Filter in SO-8 Package
■
Pin Selectable 1MHz/500kHz Cutoff Frequency
■
Signal-to-Noise Ratio (SNR): 75dB
■
Signal-to-Noise Ratio with –63dB THD: 69dB
■
Passband Ripple (fCUTOFF = 1MHz): ±0.3dB
■
Stopband Attenuation Better Than 60dB
f
CUTOFF = 500kHz, the filter response closely follows the
■
No External Components Required
1MHz case with the exception of passband flatness near
the cutoff frequency; the gain at fCUTOFF is –1.3dB.
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The LTC1560-1, unlike other high frequency filters, is
designed for low noise and low distortion. With a 1VRMS
input signal, the signal-to-noise ratio is 69dB and the THD
is –63dB. The maximum SNR of 75dB is obtained with a
2.1VRMS input signal. This results in –46dB THD.
APPLICATIONS
■
Antialiasing Filters
■
Smoothing or Reconstruction Filters
■
Communication Filters
U
The LTC1560-1 operates with±5V supplies, has a power
saving mode and is available in an SO-8 surface mount
package.
DESCRIPTION
The LTC®1560-1 is a 5th order, continuous-time, lowpass
filter. The elliptic transfer function of the LTC1560-1 was
carefully chosen to reach a compromise between selectiv-
ity, for antialiasing applications, and transient response.
The filter cutoff frequency, fCUTOFF, is pin selectable to
Other cutoff frequencies from 450kHz to 1.5MHz can be
obtained. Demo board DC135A is available for the
LTC1560-1. For more information please contact LTC
Marketing.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATION
Frequency Response
10
0
1MHz/500kHz Elliptic Lowpass Filter
1
2
8
7
–10
–20
–30
–40
–50
–60
–70
–80
GND
V
OUT
V
OUT
V
(OR –5V)
V
SHDN
IN
IN
LTC1560-1
GND
3
4
6
5
+
V
5V
0.1µF
0.01µF
–
0.5f /f
C
–5V
V
C
0.1µF
0.01µF
–5V
1MHz
5V
f
= 1MHz/500kHz
1
CUTOFF
–90
0.1
10
500kHz
FREQUENCY (MHz)
1560-1 TA01
1560-1 TA02
sn15601 15601fs
1
LTC1560-1
W W U W
U
W U
ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
Total Supply Voltage (V+ to V–) ............................. 12V
Power Dissipation............................................. 400mW
Burn-In Voltage ................................................... ±5.5V
Operating Temperature Range
ORDER PART
NUMBER
TOP VIEW
GND
1
2
3
4
8
7
6
5
V
OUT
V
IN
SHDN
LTC1560-1CS8
LTC1560-1IS8
+
GND
V
LTC1560-1C ........................................... 0°C to 70°C
LTC1560-1I ....................................... –40°C to 85°C
Maximum Junction Temperature ......................... 150°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
–
V
0.5f f
C/ C
S8 PART MARKING
S8 PACKAGE
8-LEAD PLASTIC SO
15601
15601I
TJMAX = 150°C, θJA = 125°C/ W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
VS = ±5V, TA = 25°C, Pin 5 = –5V (fCUTOFF = 1MHz), Pin 7 = 0V unless otherwise specified.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Operating Supply Voltage Range
±4.5
±5.0
±5.5
V
Passband Gain (f
= 1MHz)
V
IN
= 0.5V
, f = 20kHz
RMS IN
0.17
0.18
0.08
dB
dB
dB
dB
dB
dB
dB
CUTOFF
f
= 100kHz
●
–0.3
0.6
IN
IN
IN
IN
IN
IN
f
f
f
f
f
= 300kHz
= 550kHz (Gain Relative to 100kHz)
= 850kHz (Gain Relative to 100kHz)
= 950kHz (Gain Relative to 100kHz)
●
●
●
●
–0.35 0.05
0.3
0
0.5
1.0
–0.8
–3.0
–5.0
–0.3
0.6
–1.0
= f
CUTOFF
= 1MHz (Gain Relative to 100kHz)
Transition Band Gain (Note 1)
V
IN
= 0.5V
, f = 1.4MHz
●
–24
–42
–51
–18
dB
dB
dB
RMS IN
f
= 1.9MHz
= 2.0MHz
IN
IN
f
Stopband Gain (f
Passband Gain (f
= 1MHz) (Note 2)
= 500kHz)
f
f
f
= 2.44MHz
= 3.0MHz
= 6.0MHz
●
–70
–68
–65
dB
dB
dB
CUTOFF
IN
IN
IN
–66.1
f
f
f
= 100kHz, Pin 5 = 5V
0.14
–1.6
–45
dB
dB
dB
CUTOFF
IN
IN
IN
= f
= 500kHz
●
–4
0.5
29
CUTOFF
= 1.4MHz
Output Voltage Swing
Output DC Offset (V
R = 5k
L
±2.20
±1.75
±3
V
V
L
R = 5k
●
●
)
±250
22
mV
mA
mA
OS
Power Supply Current (I )
S
Power Supply Current in Shutdown Mode Pin 7 at 5V
1
Total Output Noise
V
IN
V
IN
(Pin 2) Tied to Ground, f
(Pin 2) Tied to Ground, f
= 1MHz, BW = 2MHz
= 0.5MHz, BW = 1MHz
350
322
µV
RMS
µV
RMS
CUTOFF
CUTOFF
Total Harmonic Distortion (THD)
V
IN
= 1V
, f = 200kHz, f
= 1MHz, BW = 1MHz
= 1MHz, BW = 1MHz
–63
–61
–62
dB
dB
dB
RMS IN
CUTOFF
= 300kHz, f
CUTOFF
f
IN
IN
f
= 1MHz, f
= 1MHz, BW = 2MHz
CUTOFF
f
f
= 300kHz, f
= 500kHz, f
= 0.5MHz, BW = 1MHz
= 0.5MHz, BW = 1MHz
–62
–63
dB
dB
IN
IN
CUTOFF
CUTOFF
Input Resistance (R )
●
6
8
10
kΩ
IN
connection diagram, Figure 2. A small resistor (e.g. 100Ω) can also be
The
● denotes specifications which apply over the full operating
temperature range.
used instead of the buffer to isolate any high capacitive load (C > 10pF)
L
from the filter output.
Note 1: To properly measure high frequency characteristics of the filter, a
noninverting output buffer is recommended as shown on the demo board
Note 2: The stopband gain at 2.44MHz is guaranteed by design.
sn15601 15601fs
2
LTC1560-1
W
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TYPICAL PERFORMANCE CHARACTERISTICS
Frequency Response
Frequency Response
Passband Gain
10
0
10
0
0.6
0.4
f
= 1MHz
f
= 500kHz
f
= 1MHz
CUTOFF
CUTOFF
CUTOFF
–10
–20
–30
–40
–50
–60
–70
–80
–90
–10
–20
–30
–40
–50
–60
–70
–80
0.2
0
–0.2
–0.4
–0.6
2
0
1
3
4
1.0
FREQUENCY (MHz)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
0
0.5
1.5
2.0
FREQUENCY (MHz)
FREQUENCY (MHz)
1560-1 G01
1560-1 G03
1560-1 G02
Group Delay
Passband Gain
Group Delay
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0.4
0.2
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
f
= 1MHz
f
= 500kHz
f
= 500kHz
CUTOFF
CUTOFF
CUTOFF
0
–0.2
–0.4
–0.6
–0.8
–1.0
–1.2
–1.4
0
1.0 1.25
0
0.25 0.50 0.75
1.50 1.75 2.0
0.1
0.2
FREQUENCY (MHz)
0.5
0
0.1
0.3
0.2
0.3
0.4
0.4 0.5 0.6 0.7 0.8 0.9 1.0
FREQUENCY (MHz)
FREQUENCY (MHz)
1560-1 G05
1560-1 G04
1560-1 G06
Phase vs Frequency
Phase vs Frequency
0
–45
45
0
f
= 1MHz
f
= 500kHz
CUTOFF
CUTOFF
–90
–45
–90
–135
–180
–225
–270
–135
–180
–225
340
FREQUENCY (kHz)
20
180
500 660 820 980
100
260 340
180
FREQUENCY (kHz)
20
420 500
1560-1 G08
1560-1 G07
sn15601 15601fs
3
LTC1560-1
TYPICAL PERFORMANCE CHARACTERISTICS
W
U
Transient Response
Output Noise vs Frequency
Transient Response
60
f
= 1MHz
CUTOFF
TOTAL OUTPUT NOISE = 232µV
54
48
RMS
42
36
30
24
18
12
6
1560-1 G09
1560-1 G10
fCUTOFF = 0.5MHz
VIN = 5VP-P
fIN = 50kHz
2µs/DIV
fCUTOFF = 1MHz
VIN = 5VP-P
fIN = 50kHz
2µs/DIV
0
0.1
0.5
1.0 1.5
FREQUENCY (MHz)
1560-1 G11
Dynamic Range
Output Noise vs Frequency
60
54
48
42
–20
–30
–40
–50
–60
–70
–80
–90
f
= 0.5MHz
f
f
= 500kHz OR 1MHz
CUTOFF
TOTAL OUTPUT NOISE = 198µV
CUTOFF
IN
= 45kHz
RMS
36
30
24
18
12
6
0
50
100
200
400 600
0.1
3
1
FREQUENCY (kHz)
INPUT VOLTAGE (V
)
RMS
1560-1 G12
1560-1 G13
THD + Noise vs Input Frequency
THD + Noise vs Input Frequency
–52
–54
–56
–58
–60
–62
–64
–66
–68
–70
–72
–52
–54
–56
–58
–60
–62
–64
–66
–68
–70
–72
f
= 500kHz
f
= 1MHz
CUTOFF
CUTOFF
V
= 1V
RMS
IN
S/N = 74dB
V
= 1V
RMS
IN
S/N = 72dB
V
= 0.6V
RMS
IN
V
= 0.6V
RMS
S/N = 69.5dB
IN
S/N = 68dB
40
120
160 180
40
60 80 100
120
140 200
160 180
60 80 100
140
200
INPUT FREQUENCY (kHz)
INPUT FREQUENCY (kHz)
1560-1 G14
1560-1 G15
sn15601 15601fs
4
LTC1560-1
U
U
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PIN FUNCTIONS
G
ND (Pins 1, 3): Analog Ground Pins. The quality of the
tion. The power supplies can be applied in any order, that
is, the positive supply can be applied before the negative
supply and vice versa. Switching power supplies are not
recommended.
analog ground can affect the filter performance. For dual
supply operation the analog ground pin should be con-
nected to an analog ground plane surrounding the pack-
age. The analog ground plane should be connected to a
digital ground plane (if any) at a single point. For single
supplyoperation,theanaloggroundpinshouldbebiased
at one-half the power supply across the device (see
Figure 1) and the analog ground plane should then be
connected to V– (Pin 4).
0.5fC/fC (Pin 5): By tying Pin 5 high the filter cutoff
frequency is internally programmed for 500kHz. By tying
Pin 5 low the cutoff frequency will switch to 1MHz. Pin 5
should not be left floating. The logic threshold of Pin 5 is
approximately 0.4 times the total power supply across the
device.
VIN (Pin 2): The filter input is internally connected to the
inverting input of a high frequency op amp through an 8k
resistor.
SHDN (Pin 7): Shutdown. Under normal operating condi-
tions, Pin 7 should be shorted either to the analog ground
(Pin1)ortoV– (Pin4).IfPin7ispulledhightoV+,thefilter
operation will stop and the IC will be placed in a power
saving mode. The power supply current will then be
reduced to 1mA. For a ±5V supply, the logic threshold of
Pin 7 is 2.5V. Pin 7 is internally connected to the analog
ground pin via a 50k resistor.
V–, V+ (Pins 4, 6): Power Supply Pins. The negative and
positive power supply (Pins 4 and 6 respectively) should
be decoupled with a 0.1µF capacitor in parallel with a
0.01µF. Both capacitors should be types designed for
decoupling video frequencies and they should be placed
as close as possible to the power supply pins of the filter.
Parallel routing of high frequency signal paths should be
avoided; they will couple into the device’s power supply
pins and cause gain inaccuracy and stopband degrada-
VOUT (Pin 8): The filter output pin can sink or source 1mA.
The total harmonic distortion of the filter will degrade
when driving coaxial cables or loads less than 10k without
an output buffer.
+
V
10k
0.1µF
0.01µF
1
2
8
7
V
OUT
GND
V
OUT
1µF
0.01µF
V
IN
V
IN
10k
SHDN
LTC1560-1
3
4
6
5
+
GND
V
+
–
GND OR V
0.5f /f
C
V
C
ANALOG GROUND PLANE
SYSTEM GROUND
DIGITAL GROUND
PLANE
1560-1 F01
Figure 1. Connections for Single Supply Operation
sn15601 15601fs
5
LTC1560-1
U
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APPLICATIONS INFORMATION
mode can also be activated via S1. The output of the filter
is buffered by U2, an LT®1360 op amp. The buffering can
be bypassed by using jumper JP1. Figure 3 shows the
demo board layout.
TheperformanceoftheLTC1560-1canbeeasilyevaluated
byusingdemoboard135Awhichcanbeobtainedthrough
LTC marketing. Figure 2 shows the circuit connection of
the LTC1560-1 in demo board 135A. The filter cutoff
frequency can be switched via S2 and the power savings
R2
332Ω
OUT2
15V
E3
TP
E4
TP
C9
0.01µF
C10
1µF
25V
Y5V
JP1
JUMPER
3
2
1
–
2
3
7
OUT1
–15V
U2
6
E5
TP
R1
1k
LT1360CS8
+
U1
4
E6
TP
LTC1560-1
S1
C8
C7
1
2
3
4
8
7
6
5
GS01MSCKE
1µF
25V
Y5V
0.01µF
GND
V
OUT
V
IN
E1
TP
V
SHDN
IN
5V
E7
TP
+
GND
V
–5V
C5
C6
E2
TP
–
V
0.5f /f
C C
0.22µF
1µF
16V
X7R
C3
C4
0.01µF
C2
0.22µF
1µF
16V
X7R
C1
0.01µF
S2
GS01MSCKE
GND
GND
GND
E8
TP
E9
TP
E10
TP
1560-1 F02
Figure 2. Demo Board 135A Connection Diagram
FILTER INPUT
GROUND
UNBUFFERED OUTPUT
BUFFERED OUTPUT
GROUND
+5V FILTER SUPPLY
GROUND
+15V BUFFER SUPPLY
–5V FILTER SUPPLY
–15V BUFFER SUPPLY
1560-1 F03
Figure 3. Demo Board 135A Layout
sn15601 15601fs
6
LTC1560-1
U
TYPICAL APPLICATIONS N
Augmenting the LTC1560-1 for Improved Delay Flatness
40.2k
20k
22pF
5V
9.75k
22pF
6.49k
0.1µF
0.1µF
1
2
8
7
2
3
GND
V
–
OUT
6.65k
1
6
5
8
1/2 LT1364
–
V
IN
(OR –5V)
V
49.9Ω
SHDN
IN
7
+
1/2 LT1364
V
OUT
LTC1560-1
GND
3
4
6
5
+
+
5V
V
4
0.1µF
0.01µF
–
–5V
0.5f /f
C
V
C
–5V
1560-1 TA05
0.01µF
0.1µF
2-Level Eye Diagram of the Equalized Filter
1560-1 TA06
2Mbps/s
1MHz Lowpass Filter Cascaded with a 30kHz 3rd Order Highpass Filter
Gain vs Frequency
10
0
560pF
5V
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
0.1µF
23.7k
1k
1
2
8
7
3
2
8
560pF 560pF
2.61k
GND
V
+
OUT
560pF
1
6
5
39pF
(OR –5V)
1/2 LT1364
–
V
IN
V
SHDN
IN
7
1/2 LT1364
–
LTC1560-1
GND
4
3
4
6
5
+
+
V
0.1µF
0.1µF
0.01µF
–
0.5f /f
C
V
C
–5V
0.01µF
1560-1 TA09
0.1µF
0.1
1
10
100
1000 10,000
FREQUENCY (kHz)
1560-1 TA10
sn15601 15601fs
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
LTC1560-1
TYPICAL APPLICATION
U
Measured Frequency Response
A Simple Highpass/Lowpass Filter
15V
10
0
0.1µF
–10
–20
–30
–40
–50
–60
–70
–80
–90
1k
1
2
8
7
3
2
7
GND
V
+
–
OUT
300pF
300pF
8
V
LT1360
4
OUT
V
IN
(OR –5V)
V
SHDN
IN
LTC1560-1
GND
8.1k
–5V
3
4
6
5
+
5V
V
0.1µF
0.01µF
–
0.5f /f
C
V
C
0.1µF
0.1µF
0.01µF
–15V
1560-1 TA07
20
100
1000
10000
FREQUENCY (kHz)
1560-1 TA08
U
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
0.010 – 0.020
(0.254 – 0.508)
7
5
8
6
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
SO8 0695
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
1
3
4
2
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
Single/Dual/Quad C-LoadTM Op Amps
LT1360/LT1361/
LT1362
50MHz, 800V/µs Op Amp(s)
LTC1562
Active RC Quad Universal Filter
Very Low Noise, Low Distortion
C-Load is a trademark of Linear Technology Corporation
sn15601 15601fs
LT/GP 1197 4K • PRINTED IN USA
Linear Technology Corporation
●
1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900
8
●
●
LINEAR TECHNOLOGY CORPORATION 1997
FAX: (408) 434-0507 TELEX: 499-3977 www.linear-tech.com
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