LTC1069-7IS8 반도체 회로 부품 판매점
Linear Phase 8th Order Lowpass Filter
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 Linear Technology |
LTC1069-7
Linear Phase
8th Order Lowpass Filter
FEATURES
s 8th Order, Linear Phase Filter in SO-8 Package
s Raised Cosine Amplitude Response
s – 43dB Attenuation at 2× fCUTOFF
s Wideband Noise: 140µVRMS
s Operates from Single 5V Supply to
±5V Power Supplies
s Clock-Tunable to 200kHz with ±5V Supplies
s Clock-Tunable to 120kHz with Single 5V Supply
U
APPLICATIONS
s Digital Communication Filter
s Antialiasing Filter with Linear Phase
s Smoothing Filters
DESCRIPTION
The LTC®1069-7 is a monolithic, clock-tunable, linear
phase, 8th order lowpass filter. The amplitude response
of the filter approximates a raised cosine filter with an
alpha of one. The gain at the cutoff frequency is – 3dB and
the attenuation at twice the cutoff frequency is 43dB. The
cutoff frequency of the LTC1069-7 is set by an external
clock and is equal to the clock frequency divided by 25.
The ratio of the internal sampling frequency to the cutoff
frequency is 50:1 that is, the input signal is sampled twice
per clock cycle to lower the risk of aliasing. The LTC1069-
7 can be operated from a single 5V supply up to dual ±5V
supplies.
The gain and phase response of the LTC1069-7 can be
used in digital communication systems where pulse shap-
ing and channel bandwidth limiting must be carried out.
Any system that requires an analog filter with linear phase
and sharper roll off than conventional Bessel filters can
use the LTC1069-7.
The LTC1069-7 has a wide dynamic range. With ±5V
supplies and an input range of 0.1VRMS to 2VRMS, the
signal-to-(noise + THD) ratio is ≥ 60dB. The wideband
noise of the LTC1069-7 is 140µVRMS. Unlike other
LTC1069-X filters, the typical passband gain of the
LTC1069-7 is equal to –1V/V.
The LTC1069-7 is available in an SO-8 package.
Other filter responses with lower power/speed specifica-
tions can be obtained. Please contact LTC Marketing.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Single 5V Supply, Linear Phase 100kHz Lowpass Filter
0.47µF
5V
0.1µF
AGND
VOUT
V+ V–
LTC1069-7
NC NC
VIN VIN
CLK
VOUT
fCLK = 2.5MHz
1069-7 TA01
10
0
–10
– 20
– 30
– 40
– 50
– 60
– 70
10
Frequency Response
100
FREQUENCY (kHz)
1000
1069-7 TA02
1
LTC1069-7
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V + to V –) ............................. 12V
Power Dissipation............................................. 400mW
Operating Temperature Range
LTC1069-7C ........................................... 0°C to 70°C
LTC1069-7I ....................................... – 40°C to 85°C
Storage Temperature ............................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
AGND 1
V+ 2
NC 3
VIN 4
8 VOUT
7 V–
6 NC
5 CLK
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 110°C/ W
ORDER PART
NUMBER
LTC1069-7CS8
LTC1069-7IS8
S8 PART MARKING
10697
10697I
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
fCUTOFF is the filter’s cutoff frequency and is equal to fCLK/25. The fCLK signal level is TTL or CMOS (max clock rise or
fall time ≤ 1µs), RL = 10k, TA = 25°C, unless otherwise specified. All AC gains are measured relative to the passband gain.
PARAMETER
Passband Gain (fIN ≤ 0.2fCUTOFF)
Gain at 0.25fCUTOFF
Gain at 0.50fCUTOFF
Gain at 0.75fCUTOFF
Gain at fCUTOFF
Gain at 1.5fCUTOFF
Gain at 2.0fCUTOFF
CONDITIONS
VS = ±5V, fCLK = 2.5MHz
fTEST = 1kHz, VIN = 1VRMS
VS = 4.75V, fCLK = 500kHz
fTEST = 1kHz, VIN = 0.5VRMS
VS = ±5V, fCLK = 2.5MHz
fTEST = 25kHz, VIN = 1VRMS
VS = 4.75V, fCLK = 500kHz
fTEST = 5kHz, VIN = 0.5VRMS
VS = ±5V, fCLK = 2.5MHz
fTEST = 50kHz, VIN = 1VRMS
VS = 4.75V, fCLK = 500kHz
fTEST = 10kHz, VIN = 0.5VRMS
VS = ±5V, fCLK = 2.5MHz
fTEST = 75kHz, VIN = 1VRMS
VS = 4.75V, fCLK = 500kHz
fTEST = 15kHz, VIN = 0.5VRMS
VS = ±5V, fCLK = 2.5MHz
fTEST = 100kHz, VIN = 1VRMS
VS = 4.75V, fCLK = 500kHz
fTEST = 20kHz, VIN = 0.5VRMS
VS = ±5V, fCLK = 2.5MHz
fTEST = 150kHz, VIN = 1VRMS
VS = 4.75V, fCLK = 500kHz
fTEST = 30kHz, VIN = 0.5VRMS
VS = ±5V, fCLK = 2.5MHz
fTEST = 200kHz, VIN = 1VRMS
VS = 4.75V, fCLK = 500kHz
fTEST = 40kHz, VIN = 0.5VRMS
MIN TYP MAX
– 0.10 ±0.75
q ±0.90
– 0.10 ±0.75
q ±0.90
– 0.30
q – 0.55
– 0.1
– 0.05
q – 0.30
0.15
– 1.0
q – 1.40
– 0.35
– 0.30
q – 0.60
0
– 1.65
q – 2.1
– 0.80
– 0.75
q – 1.15
– 0.25
– 3.5
q – 4.0
– 2.7
– 2.9
q – 3.3
– 2.4
– 16.5
q – 19
– 14
– 18.1
q – 20
– 17
– 43
q – 55
– 38
– 41
q – 48
– 39
UNITS
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
2
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LTC1069-7IS8 filter
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