LINER LTC1069-7C Linear phase 8th order lowpass filter Datasheet

LTC1069-7
Linear Phase
8th Order Lowpass Filter
FEATURES
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8th Order, Linear Phase Filter in SO-8 Package
Raised Cosine Amplitude Response
– 43dB Attenuation at 2× fCUTOFF
Wideband Noise: 140µVRMS
Operates from Single 5V Supply to
±5V Power Supplies
Clock-Tunable to 200kHz with ±5V Supplies
Clock-Tunable to 120kHz with Single 5V Supply
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APPLICATIONS
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Digital Communication Filter
Antialiasing Filter with Linear Phase
Smoothing Filters
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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 LTC10697 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 shaping 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 specifications can be obtained. Please contact LTC Marketing.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATION
Frequency Response
10
Single 5V Supply, Linear Phase 100kHz Lowpass Filter
AGND
VOUT
0
–10
VOUT
V+
0.47µF
0.1µF
GAIN (dB)
5V
V–
LTC1069-7
VIN
NC
NC
VIN
CLK
fCLK = 2.5MHz
–20
– 30
– 40
– 50
1069-7 TA01
– 60
–70
10
100
FREQUENCY (kHz)
1000
1069-7 TA02
1
LTC1069-7
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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
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ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
ORDER PART
NUMBER
TOP VIEW
AGND 1
8
VOUT
V+ 2
7
V–
NC 3
6
NC
VIN 4
5
CLK
LTC1069-7CS8
LTC1069-7IS8
S8 PART MARKING
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 110°C/ W
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
CONDITIONS
Passband Gain (fIN ≤ 0.2fCUTOFF)
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
●
– 0.55
VS = 4.75V, fCLK = 500kHz
fTEST = 5kHz, VIN = 0.5VRMS
●
– 0.30
VS = ±5V, fCLK = 2.5MHz
fTEST = 50kHz, VIN = 1VRMS
●
– 1.40
VS = 4.75V, fCLK = 500kHz
fTEST = 10kHz, VIN = 0.5VRMS
●
– 0.60
VS = ±5V, fCLK = 2.5MHz
fTEST = 75kHz, VIN = 1VRMS
●
– 2.1
VS = 4.75V, fCLK = 500kHz
fTEST = 15kHz, VIN = 0.5VRMS
●
– 1.15
VS = ±5V, fCLK = 2.5MHz
fTEST = 100kHz, VIN = 1VRMS
●
– 4.0
VS = 4.75V, fCLK = 500kHz
fTEST = 20kHz, VIN = 0.5VRMS
●
– 3.3
VS = ±5V, fCLK = 2.5MHz
fTEST = 150kHz, VIN = 1VRMS
●
– 19
VS = 4.75V, fCLK = 500kHz
fTEST = 30kHz, VIN = 0.5VRMS
●
– 20
VS = ±5V, fCLK = 2.5MHz
fTEST = 200kHz, VIN = 1VRMS
●
– 55
VS = 4.75V, fCLK = 500kHz
fTEST = 40kHz, VIN = 0.5VRMS
●
– 48
Gain at 0.25fCUTOFF
Gain at 0.50fCUTOFF
Gain at 0.75fCUTOFF
Gain at fCUTOFF
Gain at 1.5fCUTOFF
Gain at 2.0fCUTOFF
2
MIN
TYP
MAX
UNITS
– 0.10
±0.75
±0.90
dB
dB
– 0.10
±0.75
±0.90
dB
dB
– 0.1
dB
dB
0.15
dB
dB
– 0.35
dB
dB
0
dB
dB
– 0.80
dB
dB
– 0.25
dB
dB
– 2.7
dB
dB
– 2.4
dB
dB
– 14
dB
dB
– 17
dB
dB
– 38
dB
dB
– 39
dB
dB
– 0.30
– 0.05
– 1.0
– 0.30
– 1.65
– 0.75
– 3.5
– 2.9
– 16.5
– 18.1
– 43
– 41
LTC1069-7
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
CONDITIONS
MIN
TYP
MAX
UNITS
Gain at 5.0fCUTOFF
VS = 4.75V, fCLK = 500kHz
fTEST = 100kHz, VIN = 0.5VRMS
– 70
–59
– 55
dB
Gain at fCUTOFF (160kHz)
VS = ±5V, fCLK = 4MHz
fTEST = 160kHz, VIN = 1VRMS
Phase at 0.5fCUTOFF
VS = ±5V, fCLK = 2.5MHz
fTEST = 50kHz
– 35
– 30.5
– 25
Deg
Phase at fCUTOFF
VS = ±5V, fCLK = 2.5MHz
fTEST = 100kHz
– 240
– 235
– 230
Deg
Passband Phase Deviation from
Linear Phase (Note 1)
VS = ±5V, fCLK = 500kHz
– 3.0
Output DC Offset (Input at GND)
VS = ±5V, fCLK = 500kHz
VS = 4.75V, fCLK = 400kHz
50
25
– 2.1
Output Voltage Swing
VS = ±5V, ISOURCE/ISINK ≤ 1mA, RL = 10k
VS = 4.75V, ISOURCE/ISINK ≤ 1mA, RL = 10k
Power Supply Current
VS = ±5V, fCLK = 500kHz
●
●
±3.5
2.6
●
The ● denotes specifications which apply over the full operating
temperature range.
Note 1: Phase Deviation = 1/2(Phase at 0Hz – Phase at fCUTOFF) – (Phase
at 0Hz – Phase at 0.5fCUTOFF)
Phase at 0Hz = 180° (guaranteed by design)
Deg
mV
mV
125
±4.0
3.6
V
VP-P
18
26
29
mA
mA
13
15
16.5
mA
mA
●
VS = 4.75V, fCLK = 400kHz
dB
Example: An LTC1069-7 has Phase at 0.5fCUTOFF = – 30.5° and Phase at
fCUTOFF = – 235°.
Passband Phase Deviation from Linear Phase
= 1/2[180° – (– 235°)] – [(180° – (– 30.5°)] = – 3°
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TYPICAL PERFORMANCE CHARACTERISTICS
Passband Gain vs Frequency
Transition Band Gain vs Frequency
10
1.0
VS = ±5V
fCLK = 500kHz
fC = 20kHz
VIN = 2VRMS
0.5
0
0
VS = ±5V
fCLK = 500kHz
fC = 20kHz
VIN = 2VRMS
–44
–2.0
–20
–30
–2.5
–3.0
VS = ±5V
fCLK = 500kHz
fC = 20kHz
VIN = 2VRMS
–46
GAIN (dB)
–1.5
–48
–50
–52
–54
–56
–40
–58
–3.5
–4.0
–42
–10
–1.0
GAIN (dB)
GAIN (dB)
–0.5
Stopband Gain vs Frequency
–40
–50
1
3
5
7 9 11 13 15 17 19 21
FREQUENCY (kHz)
LTC1069-7 • TPC01
21 23 25 27 29 31 33 35 37 39 41
FREQUENCY (kHz)
LTC1069-7 • TPC02
–60
41 45 49 53 57 61 65 69 73 77 81
FREQUENCY (kHz)
LTC1069-7 • TPC03
3
LTC1069-7
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TYPICAL PERFORMANCE CHARACTERISTICS
Passband Gain vs
Clock Frequency
Gain vs Frequency
VS = ±5V
fCLK = 250kHz
fC = 10kHz
VIN = 1VRMS
0
fCLK = 5MHz
0
–3
–20
–30
–0.5
–6
fCLK = 2.5MHz
fCLK = 4.5MHz
fCLK = 4MHz
fCLK = 3.5MHz
–9
–12
–40
–15
–60
–18
20
10
FREQUENCY (kHz)
100
–4.0
60
40
80 100 120 140 160 180 200
FREQUENCY (kHz)
fCLK = 2MHz
fC = 80kHz
VIN = 0.5VRMS
0
GAIN (dB)
GAIN (dB)
GAIN (dB)
–30
–6
–9
fCLK = 2.5MHz
–12
VS = 5V
VS = ±5V
–18
20
–60
10 30 50 70 90 110 130 150 170 190 210
FREQUENCY (kHz)
VS = 5V
fCLK = 2.5MHz
fC = 100kHz
VIN = 1VRMS
–4.0
60
40
10 20
80 100 120 140 160 180 200
FREQUENCY (kHz)
30
40 50 60 70
FREQUENCY (kHz)
2
135
1
90
0
45
–1
0
–45
–90
PHASE
13.5
13.0
GAIN
12.5
–3
–4
–135
–5
–6
–180
–6
–7
–225
–7
–8
–270
10 20 30 40 50 60 70 80 90 100
FREQUENCY (kHz)
–8
LTC1069-7 • TPC10
VS = ±5V
fCLK = 2.5MHz
fC = 100kHz
–2
–5
12.0
DELAY
0
90 100
LTC1069-7 • TPC09
11.5
11.0
10 20 30 40 50 60 70 80 90 100
FREQUENCY (kHz)
LTC1069-7 • TPC12
DELAY (µs)
–3
180
PHASE (DEG)
GAIN
80
Passband Gain and Delay vs
Frequency
GAIN (dB)
–1
GAIN (dB)
TA = 25°C
LTC1069-7 • TPC08
VS = ±5V
fCLK = 2.5MHz
fC = 100kHz
0
TA = –40°C
–2.0
–3.5
Passband Gain and Phase vs
Frequency
–4
–1.5
–3.0
fCLK = 1.5MHz
LTC1069-7 • TPC07
–2
–1.0
–2.5
fCLK = 2MHz
–15
TA = 85°C
–0.5
fCLK = 3MHz
–20
4
0.5
–3
0
160
130
Passband Gain vs Frequency
VS = 5V
VIN = 1VRMS
0
–10
1
100
70
FREQUENCY (kHz)
1.0
3
2
40
10
LTC1069-7 • TPC06
Passband Gain vs
Clock Frequency
10
–50
TA = 25°C
LTC1069-7 • TPC05
Gain vs Supply Voltage
–40
TA = –40°C
–2.0
–3.5
LTC1069-7 • TPC04
0
–1.5
–3.0
VS = ±5V
VIN = 2VRMS
–50
TA = 85°C
–1.0
–2.5
fCLK = 3MHz
1
VS = ±5V
fCLK = 4MHz
fC = 160kHz
VIN = 2VRMS
0.5
0
GAIN (dB)
GAIN (dB)
–10
Passband Gain vs Frequency
1.0
3
GAIN (dB)
10
LTC1069-7
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TYPICAL PERFORMANCE CHARACTERISTICS
Phase Matching vs Frequency
THD + Noise vs Input (VP-P)
–40
fCLK = 1MHz
fC = 40kHz
fIN = 1kHz
–45
2.00
1.75
25°C
1.50
1.25
1.00
VS = ±5V
fCLK ≤ 2.5MHz
PHASE DIFFERENCE BETWEEN
ANY TWO UNITS (SAMPLE OF
20 REPRESENTATIVE UNITS)
0.75
0.50
0.25
–50
–50
–55
VS = 5V
–60
–65
–55
VS = 5V, VIN = 1VP-P
–60
–65
–70
VS = ±5V
–70
1
INPUT (VP-P)
0.1
VS = ±5V, VIN = 2VP-P
–75
–75
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
FREQUENCY (fCUTOFF/FREQUENCY)
fCLK = 2.5MHz
fC = 100kHz
–45
THD + NOISE (dB)
70°C
THD + NOISE (dB)
PHASE DIFFERENCE (DEG)
2.25
0
THD + Noise vs Frequency
–40
2.50
–80
10
1
10
FREQUENCY (kHz)
LTC1609-7 • TPC13
LTC1069-7 • TPC11
Transient Response
100
LTC1069-7 • TPC14
Output Voltage Swing vs
Temperature
Output Offset vs Clock Frequency
–10
4.3
VS = ±5V
0.1ms/DIV
fCLK = 500kHz
fCUTOFF = 20kHz
VIN = 4VP-P SQUARE WAVE AT 1kHz
4.2
–20
VOLTAGE SWING (V)
1V/DIV
OUTPUT OFFSET (mV)
–15
VS = 5V
–25
–30
–35
VS = ±5V
–40
VS = 5V (AGND AT 2.5V)
fCLK = 500kHz
fCUTOFF = 20kHz
RL = 10k
ISOURCE/ISINK ≤ 1mA
4.1
1.2
1.1
LTC1069-7 • TPC15
–45
–50
0.25
1.25
3.25
4.25
2.25
CLOCK FREQUENCY (MHz)
1.0
–40 –20
5.25
40
20
0
60
TEMPERATURE (°C)
LTC1069-7 • TPC16
Output Voltage Swing vs
Temperature
Supply Current vs
Supply Voltage
Supply Current vs
Clock Frequency
22
fCLK = 10Hz
VS = ±5V
fCLK = 2.5MHz
fCUTOFF = 100kHz
RL = 10k
ISOURCE/ISINK = 1mA
SUPPLY CURRENT (mA)
VOLTAGE SWING (V)
4.1
21
25°C
20
85°C
SUPPLY CURRENT (mA)
25
–4.5
100
LTC1069-7 • TPC17
4.2
4.0
80
20
–40°C
15
10
–4.6
5
–4.7
–40 –20
0
19
17
16
15
14
13
12
11
40
20
0
60
TEMPERATURE (°C)
80
100
LTC1069-7 • TPC18
VS = ±5V
18
0
1
4
2
3
SUPPLY VOLTAGE (±V)
5
6
LTC1069-7 • TPC19
10
0.25
VS = 5V
1.25
2.25
3.25
4.25
CLOCK FREQUENCY (MHz)
5.25
LTC1263 • TPC20
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LTC1069-7
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PIN FUNCTIONS
AGND (Pin 1): Analog Ground. The quality of the analog
signal ground can affect the filter performance. For either
single or dual supply operation, an analog ground plane
surrounding the package is recommended. The analog
ground plane should be connected to any digital ground at
a single point. For dual supply operation, Pin 1 should be
connected to the analog ground plane.
For single supply operation, Pin 1 should be bypassed to
the analog ground plane with a capacitor 0.47µF or larger.
An internal resistive divider biases Pin 1 to half the total
power supply. Pin 1 should be buffered if used to bias
other ICs. Figure 1 shows the connections for single
supply operation.
V+, V – (Pins 2, 7): Power Supplies. The V+ (Pin 2) and V –
(Pin 7) should be bypassed with 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 switching power supplies will lower the signal-tonoise ratio of the filter. Unlike previous monolithic filters,
the power supplies can be applied in any order, that is, the
positive supply can be applied before the negative supply
and vice versa. Figure 2 shows the connections for dual
supply operation.
NC (Pins 3, 6): No Connection. Pins 3 and 6 are not connected
to any internal circuitry; they should be tied to ground.
VIN (Pin 4): Filter Input. The filter input pin is internally
connected to the inverting inputs of two op amps through
V+
0.1µF
2
3
4
VIN
AGND
V+
VOUT
LTC1069-7
V–
NC
NC
VIN
CLK
DIGITAL
GROUND
PLANE
8
VOUT
7
POWER SUPPLY
HIGH LEVEL
LOW LEVEL
Dual Supply = ±5V
1.5V
0.5V
Single Supply = 10V
6.5V
5.5V
Single Supply = 5V
1.5V
0.5V
VOUT (Pin 8): Filter Output. Pin 8 is the output of the filter,
and it can source 23mA or sink 16mA. The total harmonic
distortion of the filter will degrade when driving coaxial cables
or loads less than 20k without an output buffer.
2
V+
0.1µF
6
5
1k
CLOCK
SOURCE
LTC1069-7 • F01
Figure 1. Connections for Single Supply Operation
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Table 1. Clock Source High and Low Thresholds
1
1
STAR
SYSTEM
GROUND
CLK (Pin 5): Clock Input. 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 necessarily be the filter’s
power supply. The analog ground of the filter should only
be connected to the clock’s ground at a single point. 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 the high level on-time is
greater than 0.42µs (VS = ± 5V). Sine waves less than
100kHz are not recommended for clock sources because
excessive slow clock rise or fall times generate internal
clock jitter. The maximum clock rise or fall time is 1µs. The
clock signal should be routed from the right side of the IC
package to avoid coupling into any input or output analog
signal path. A 1k resistor between the clock source and the
clock input (Pin 5) will slow down the rise and fall times of
the clock to further reduce charge coupling, Figure 1.
ANALOG GROUND
PLANE
ANALOG GROUND
PLANE
0.47µF
a 36k resistor for each op amp. This parallel combination
creates an 18k input impedance.
STAR
SYSTEM
GROUND
AGND
V+
VOUT
V–
8
VOUT
7
LTC1069-7
3
6
NC
NC
4
5
VIN
CLK
VIN
DIGITAL
GROUND
PLANE
V–
0.1µF
1k
CLOCK
SOURCE
LTC1069 F02
Figure 2. Connections for Dual Supply Operation
LTC1069-7
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APPLICATIONS INFORMATION
Temperature Behavior
The power supply current of the LTC1069-7 has a positive
temperature coefficient. The GBW product of its internal
op amps is nearly constant and the speed of the device
does not degrade at high temperatures.
the clock frequency and depends slightly on the power
supply voltage (see Table 3). The clock feedthrough specifications are not part of the wideband noise.
Table 3. Wideband Noise
VS
Clock Feedthrough
The clock feedthrough is defined as the RMS value of the
clock frequency and its harmonics that are present at the
filter’s output (Pin 8). The clock feedthrough is tested with
the input (Pin 4) shorted to the AGND pin and 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 on Table 2.
Table 2. Clock Feedthrough
VS
CLOCK FEEDTHROUGH
5V
400µVRMS
±5V
850µVRMS
Any parasitic switching transients during the rising and
falling edges of the incoming clock are not part of the clock
feedthrough specifications. Switching transients have frequency 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 can be reduced by adding a single RC
lowpass filter at the output (Pin 8) of the LTC1069-7.
WIDEBAND NOISE
4.75V
125µVRMS
± 5V
140µVRMS
Aliasing
Aliasing is an inherent phenomenon of sampled data
systems and it occurs for input frequencies approaching
the sampling frequency. The internal sampling frequency
of the LTC1069-7 is 50 times its fCUTOFF frequency. For
instance if a 48kHz, 100mVRMS signal is applied at the
input of an LTC1069-7 operating with a 50% duty cycle
25kHz clock, a 2kHz, 741µVRMS alias signal will appear at
the filter output. Table 4 shows details.
Table 4. Aliasing
INPUT FREQUENCY
VIN = 1VRMS
OUTPUT LEVEL
Relative to Input
OUTPUT FREQUENCY
Aliased Frequency
fCLK /fC = 25:1, fCUTOFF = 1kHz
40kHz (or 60kHz)
–59.9dB
10kHz
47kHz (or 53kHz)
–54.2dB
3kHz
48kHz (or 52kHz)
–42.6dB
2kHz
48.5kHz (or 51.5kHz)
–18.3dB
1.5kHz
49kHz (or 52kHz)
–2.9dB
1.0kHz
49.5kHz (or 50.5kHz)
–0.65dB
0.5kHz
Wideband Noise
Speed Limitations
The wideband noise of the filter is the total RMS value of
the device’s noise spectral density and determines the
operating signal-to-noise ratio. Most of the wideband
noise frequency contents lie within the filter passband.
The wideband noise cannot be reduced by adding post
filtering. The total wideband noise is nearly independent of
To avoid op amp slew rate limiting, the signal amplitude
should be kept below a specified level as shown in Table 5.
Table 5. Maximum VIN vs VS and Clock
VS
MAXIMUM CLOCK
MAXIMUM VIN
5V
≥ 2.5MHz
340mVRMS (fIN ≥ 200kHz)
±5V
≥ 4.5MHz
1.2VRMS (fIN ≥ 400kHz)
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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LTC1069-7
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TYPICAL APPLICATION
Clock Tunable, Noninverting, Linear Phase 8th Order Filter to 200kHz fCUTOFF
51pF
10k
5V
0.1µF
1µF
AGND
10k
VOUT
–5V
5V
V+
0.1µF
LT ®1354
V–
VOUT
+
0.1µF
LTC1069-7
NC
–
NC
0.1µF
–5V
VIN
VIN
CLK
fCLK ≤ 5MHz
1069-7 TA03
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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)
8
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
0.053 – 0.069
(1.346 – 1.752)
0°– 8° TYP
0.016 – 0.050
0.406 – 1.270
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
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
7
6
5
0.004 – 0.010 0.228 – 0.244
(0.101 – 0.254) (5.791 – 6.197)
0.050
(1.270)
TYP
0.150 – 0.157**
(3.810 – 3.988)
1
2
3
4
SO8 0996
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC1064-3
Linear Phase, Bessel 8th Order Filter
fCLK/fC = 75/1 or 150/1, Very Low Noise
LTC1064-7
Linear Phase, 8th Order Lowpass Filter
fCLK/fC = 50/1 or 100/1, fC(MAX) = 100kHz
LTC1164-7
Low Power, Linear Phase Lowpass Filter
fCLK/fC = 50/1 or 100/1, IS = 2.5mA, VS = 5V
LTC1264-7
Linear Phase 8th Order Lowpass Filter
fCLK/fC = 25/1 or 50/1, fC(MAX) = 200kHz
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417 ● (408) 432-1900
FAX: (408) 434-0507● TELEX: 499-3977 ● www.linear-tech.com
10697f LT/TP 0697 7K • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 1996