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Linear Technology Electronic Components Datasheet

LTC1560-1 Datasheet

1MHz/500kHz Continuous Time/ Low Noise/ Lowpass Elliptic Filter

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LTC1560-1 pdf
LTC1560-1
1MHz/500kHz
Continuous Time,
Low Noise, Lowpass Elliptic Filter
FEATURES
s 5th Order, 1MHz Elliptic Filter in SO-8 Package
s Pin Selectable 1MHz/500kHz Cutoff Frequency
s Signal-to-Noise Ratio (SNR): 75dB
s Signal-to-Noise Ratio with – 63dB THD: 69dB
s Passband Ripple (fCUTOFF = 1MHz): ±0.3dB
s Stopband Attenuation Better Than 60dB
s No External Components Required
U
APPLICATIONS
s Antialiasing Filters
s Smoothing or Reconstruction Filters
s Communication Filters
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
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. Stopband attenuation is 63dB at 2.43fCUTOFF and
above, remaining at least 60dB to 10MHz with proper
board layout. When the LTC1560-1 is programmed for
fCUTOFF = 500kHz, the filter response closely follows the
1MHz case with the exception of passband flatness near
the cutoff frequency; the gain at fCUTOFF is – 1.3dB.
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.
The LTC1560-1 operates with ±5V supplies, has a power
saving mode and is available in an SO-8 surface mount
package.
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.
TYPICAL APPLICATION
– 5V
0.1µF
1MHz/500kHz Elliptic Lowpass Filter
VIN
0.01µF
1
GND
8
VOUT
2
VIN
7
SHDN
3
LTC1560-1
GND V +
6
4 V
5
0.5fC / fC
VOUT
(OR – 5V)
0.1µF
5V
0.01µF
– 5V
1MHz
5V
500kHz
1560-1 TA01
Frequency Response
10
0
–10
– 20
– 30
– 40
– 50
– 60
– 70
– 80
fCUTOFF = 1MHz/500kHz
– 90
0.1 1
FREQUENCY (MHz)
10
1560-1 TA02
1


Linear Technology Electronic Components Datasheet

LTC1560-1 Datasheet

1MHz/500kHz Continuous Time/ Low Noise/ Lowpass Elliptic Filter

No Preview Available !

LTC1560-1 pdf
LTC1560-1
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V + to V ) ............................. 12V
Power Dissipation............................................. 400mW
Burn-In Voltage ................................................... ±5.5V
Operating Temperature Range
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
PACKAGE/ORDER INFORMATION
TOP VIEW
GND 1
VIN 2
GND 3
V4
8 VOUT
7 SHDN
6 V+
5 0.5fC/fC
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 125°C/ W
Consult factory for Military grade parts.
ORDER PART
NUMBER
LTC1560-1CS8
LTC1560-1IS8
S8 PART MARKING
15601
15601I
ELECTRICAL CHARACTERISTICS
VS = ±5V, TA = 25°C, Pin 5 = – 5V (fCUTOFF = 1MHz), Pin 7 = 0V unless otherwise specified.
PARAMETER
Operating Supply Voltage Range
Passband Gain (fCUTOFF = 1MHz)
Transition Band Gain (Note 1)
Stopband Gain (fCUTOFF = 1MHz) (Note 2)
Passband Gain (fCUTOFF = 500kHz)
Output Voltage Swing
Output DC Offset (VOS)
Power Supply Current (IS)
Power Supply Current in Shutdown Mode
Total Output Noise
Total Harmonic Distortion (THD)
Input Resistance (RIN)
CONDITIONS
VIN = 0.5VRMS, fIN = 20kHz
fIN = 100kHz
fIN = 300kHz
fIN = 550kHz (Gain Relative to 100kHz)
fIN = 850kHz (Gain Relative to 100kHz)
fIN = 950kHz (Gain Relative to 100kHz)
fIN = fCUTOFF = 1MHz (Gain Relative to 100kHz)
VIN = 0.5VRMS, fIN = 1.4MHz
fIN = 1.9MHz
fIN = 2.0MHz
fIN = 2.44MHz
fIN = 3.0MHz
fIN = 6.0MHz
fIN = 100kHz, Pin 5 = 5V
fIN = fCUTOFF = 500kHz
fIN = 1.4MHz
RL = 5k
Pin 7 at 5V
VIN (Pin 2) Tied to Ground, fCUTOFF = 1MHz, BW = 2MHz
VIN (Pin 2) Tied to Ground, fCUTOFF = 0.5MHz, BW = 1MHz
VIN = 1VRMS, fIN = 200kHz, fCUTOFF = 1MHz, BW = 1MHz
fIN = 300kHz, fCUTOFF = 1MHz, BW = 1MHz
fIN = 1MHz, fCUTOFF = 1MHz, BW = 2MHz
fIN = 300kHz, fCUTOFF = 0.5MHz, BW = 1MHz
fIN = 500kHz, fCUTOFF = 0.5MHz, BW = 1MHz
q
q
q
q
q
q
q
q
q
q
q
MIN TYP
±4.5 ±5.0
– 0.3
– 0.35
– 0.8
– 3.0
– 5.0
0.17
0.18
0.08
0.05
– 0.3
0.6
– 1.0
– 24
– 42
– 51
– 70
– 68
– 66.1
0.14
– 4 – 1.6
– 45
±1.9 ±3
±250
22
1
350
322
– 63
– 61
– 62
– 62
– 63
68
MAX
±5.5
0.6
0.3
0
0.5
1.0
– 18
– 65
0.5
29
10
UNITS
V
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
V
mV
mA
mA
µVRMS
µVRMS
dB
dB
dB
dB
dB
k
The q denotes specifications which apply over the full operating
temperature range.
Note 1: To properly measure high frequency characteristics of the filter, a
noninverting output buffer is recommended as shown on the demo board
connection diagram, Figure 2. A small resistor (e.g. 100) can also be
used instead of the buffer to isolate any high capacitive load (CL > 10pF)
from the filter output.
Note 2: The stopband gain at 2.44MHz is guaranteed by design.
2


Part Number LTC1560-1
Description 1MHz/500kHz Continuous Time/ Low Noise/ Lowpass Elliptic Filter
Maker Linear Technology
Total Page 8 Pages
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LTC1560-1 pdf
LTC1560-1 Datasheet PDF
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