LTC1069-6
1
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TYPICAL APPLICATION
DESCRIPTION
Single Supply, Very Low
Power, Elliptic Lowpass Filter
The LTC
®
1069-6 is a monolithic low power, 8th order lowpass
fi lter optimized for single 3V or single 5V supply operation.
The LTC1069-6 typically consumes 1mA under single 3V
supply operation and 1.2mA under 5V operation.
The cutoff frequency of the LTC1069-6 is clock tunable and it is
equal to the clock frequency divided by 50. The input signal is
sampled twice per clock cycle to lower the risk of aliasing.
The typical passband ripple is ±0.1dB up to 0.9fCUTOFF.
The gain at fCUTOFF is –0.7dB. The transition band of the
LTC1069-6 features progressive attenuation reaching
42dB at 1.3fCUTOFF and 70dB at 2.1fCUTOFF. The maximum
stopband attenuation is 72dB.
The LTC1069-6 can be clock tuned for cutoff frequencies
up to 20kHz (single 5V supply) and for cutoff frequencies
up to 14kHz (single 3V supply).
The low power feature of the LTC1069-6 does not penalize
the device’s dynamic range. With single 5V supply and
an input range of 0.4VRMS to 1.4VRMS, the Signal-to-
(Noise + THD) ratio is ≥70dB. The wideband noise of the
LTC1069-6 is 125μVRMS.
Other fi lter responses with higher speed can be obtained.
Please contact LTC Marketing for details.
The LTC1069-6 is available in an 8-pin SO package.
Single 3V Supply 10kHz Elliptic Lowpass Filter
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
FEATURES
APPLICATIONS
n 8th Order Elliptic Filter in SO-8 Package
n Single 3V Operation: Supply Current: 1mA (Typ)
f
CUTOFF: 14kHz (Max) S/N Ratio: 72dB
n Single 5V Operation: Supply Current: 1.2mA (Typ)
f
CUTOFF: 20kHz (Max) S/N Ratio: 79dB
n ±0.1dB Passband Ripple Up to 0.9fCUTOFF (Typ)
n 42dB Attenuation at 1.3fCUTOFF
n 66dB Attenuation at 2.0fCUTOFF
n 70dB Attenuation at 2.1fCUTOFF
n Wide Dynamic Range, 75dB or More (S/N + THD),
Under Single 5V Operation
n Wideband Noise: 120µVRMS
n Clock-to-fCUTOFF Ratio: 50:1
n Internal Sample Rate: 100:1
n Handheld Instruments
n Telecommunication Filters
n Antialiasing Filters
n Smoothing Filters
n Audio
n Multimedia
AGND
V+
NC
VIN
VOUT
V–
NC
CLK
LTC1069-6
fCLK = 500kHz
3V
0.47μF
0.1μF
1069-6 TA01
FREQUENCY (kHz)
5
–80
GAIN (dB)
–70
–50
–40
–30
15
10
1069-6 TA02
–60
10 20 25
–20
–10
0
VIN = 500mVRMS
Frequency Response
LTC1069-6
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PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V+ to V–) ................................12V
Operating Temperature Range
LTC1069-6C ............................................. 0°C to 70°C
LTC1069-6I ..........................................–40°C to 85°C
Storage Temperature ..............................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
1
2
3
4
8
7
6
5
TOP VIEW
VOUT
V–
NC
CLK
AGND
V+
NC
VIN
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 130°C/W
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC1069-6CS8#PBF LTC1069-6CS8#TRPBF 10696 8-Lead Plastic SO 0°C to 70°C
LTC1069-6IS8#PBF LTC1069-6IS8#TRPBF 10696I 8-Lead Plastic SO –40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi
cations, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
SYMBOL CONDITIONS MIN TYP MAX UNITS
Passband Gain (fIN ≤ 0.2fCUTOFF)V
S = 5V, fCLK = 200kHz
fTEST = 0.25kHz, VIN = 1VRMS l
–0.25
–0.30
0.1
0.1
0.45
0.50
db
db
VS = 3V, fCLK = 200kHz
fTEST = 0.25kHz, VIN = 0.5VRMS l
–0.25
–0.30
0.1
0.1
0.45
0.50
db
db
Gain at 0.50fCUTOFF VS = 5V, fCLK = 200kHz
fTEST = 2.0kHz, VIN = 1VRMS l
–0.10
–0.15
0.07
0.07
0.25
0.30
db
db
VS = 3V, fCLK = 200kHz
fTEST = 2.0kHz, VIN = 0.5VRMS l
–0.15
–0.20
0.07
0.07
0.25
0.30
db
db
Gain at 0.75fCUTOFF VS = 5V, fCLK = 200kHz
fTEST = 3.0kHz, VIN = 1VRMS l
–0.25
–0.30
0
0
0.25
0.30
db
db
VS = 3V, fCLK = 200kHz
fTEST = 3.0kHz, VIN = 0.5VRMS l
–0.25
–0.30
0
0
0.25
0.30
db
db
Gain at 0.90fCUTOFF VS = 5V, fCLK = 200kHz
fTEST = 3.6kHz, VIN = 1VRMS l
–0.25
–0.25
0.1
0.1
0.45
0.45
db
db
VS = 3V, fCLK = 200kHz
fTEST = 3.6kHz, VIN = 0.5VRMS l
–0.25
–0.30
0.1
0.1
0.45
0.50
db
db
Gain at 0.95fCUTOFF VS = 5V, fCLK = 200kHz
fTEST = 3.8kHz, VIN = 1VRMS l
–0.35
–0.45
0.05
0.05
0.25
0.25
db
db
VS = 3V, fCLK = 200kHz
fTEST = 3.8kHz, VIN = 0.5VRMS l
–0.45
–0.55
0.05
0.05
0.25
0.35
db
db
The l denotes the specifi cations which apply over the full operating
temperature range. fCUTOFF is the fi lter’s cutoff frequency and is equal to fCLK/50. The fCLK signal level is TTL or CMOS (clock rise or
fall time ≤1µs) RL = 10k, VS = 5V, TA = 25°C, unless otherwise specifi ed. All AC gains are measured relative to the passband gain.
LTC1069-6
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ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The input offset voltage is measured with respect to AGND (Pin 1).
The input (Pin 4) is also shorted to the AGND pin. The analog ground pin
potential is internally set to (0.437)(VSUPPLY).
The l denotes the specifi cations which apply over the full operating
temperature range. fCUTOFF is the fi lter’s cutoff frequency and is equal to fCLK/50. The fCLK signal level is TTL or CMOS (clock rise or
fall time ≤1µs) RL = 10k, VS = 5V, TA = 25°C, unless otherwise specifi ed. All AC gains are measured relative to the passband gain.
SYMBOL CONDITIONS MIN TYP MAX UNITS
Gain at fCUTOFF VS = 5V, fCLK = 200kHz
fTEST = 4.0kHz, VIN = 1VRMS l
–1.50
–1.65
–0.07
–0.07
–0.20
–0.25
db
db
VS = 3V, fCLK = 200kHz
fTEST = 4.0kHz, VIN = 0.5VRMS l
–1.5
–1.7
–0.07
–0.07
0
0
db
db
Gain at 1.30fCUTOFF VS = 5V, fCLK = 200kHz
fTEST = 5.2kHz, VIN = 1VRMS l
–42
–42
–40
–39
db
db
VS = 3V, fCLK = 200kHz
fTEST = 5.2kHz, VIN = 0.5VRMS l
–41
–41
–38
–37
db
db
Gain at 2.00fCUTOFF VS = 5V, fCLK = 200kHz
fTEST = 8.0kHz, VIN = 1VRMS l
–66
–66
–61
–60
db
db
VS = 3V, fCLK = 200kHz
fTEST = 8.0kHz, VIN = 0.5VRMS l
–66
–66
–60
–59
db
dB
Gain at 0.95fCUTOFF VS = 5V, fCLK = 400kHz, fTEST = 7.6kHz, VIN = 1VRMS
VS = 3V, fCLK = 400kHz, fTEST = 7.6kHz, VIN = 0.5VRMS
–0.5
–0.5
0.15
0
0.5
0.5
db
db
Output DC Offset (Note 1) VS = 5V, fCLK = 100kHz
VS = 3V, fCLK = 100kHz
50
30
175
135
mV
mV
Output DC Offset Tempco VS = 5V, VS = 3V 30 μV/°C
Output Voltage Swing (Note 2) VS = 5V, fCLK = 100kHz
l
3.4
3.2
4.2
4.2
VP-P
VP-P
VS = 3V, fCLK = 100kHz
l
1.6
1.6
2.0
2.0
VP-P
VP-P
Power Supply Current VS = 5V, fCLK = 100kHz
l
1.2 1.60
1.65
mA
mA
VS = 3V, fCLK = 100kHz
l
1 1.40
1.55
mA
mA
Maximum Clock Frequency VS = 5V
VS = 3V
1
0.7
MHz
MHz
Input Frequency Range 0 <(fCLK – 2fC)
Input Resistance 35 50 80 kΩ
Operating Supply Voltage (Note 3) 310V
Note 3: The input voltage can swing to either rail (V+ or ground); the
output typically swings 50mV from ground and 0.8V from V+.
Note 4: The LTC1069-6 is optimized for 3V and 5V operation. Although
the device can operate with a single 10V supply or ±5V, the total harmonic
distortion will be degraded. For single 10V or ±5V supply operation we
recommend to use the LTC1069-1.
LTC1069-6
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TYPICAL PERFORMANCE CHARACTERISTICS
Passband Gain vs Clock Frequency Passband Gain vs Clock Frequency
Amplitude Response
vs Supply Voltage
Phase vs Frequency Group Delay vs Frequency Transient Response
Passband Gain vs Frequency
Transition Band Gain
vs Frequency Stopband Gain vs Frequency
FREQUENCY (kHz)
1
GAIN (dB)
1
2
9
1069-6 G01
0
–1
–2 35711
VS = SINGLE 3V
fCLK = 500kHz
fCUTOFF = 10kHz
VIN = 0.5VRMS
FREQUENCY (kHz)
10
GAIN (dB)
–30
–10
10
18
1069-6 G02
–50
–70
–40
–20
0
–60
–80
–90 12 14 16 20
VS = SINGLE 3V
fCLK = 500kHz
fCUTOFF = 10kHz
VIN = 0.5VRMS
FREQUENCY (kHz)
20
–80
GAIN (dB)
–78
–74
–72
–70
–60
–66
40 60
1069-6 G03
–76
–64
–62
–68
80 100
VS = SINGLE 3V
fCLK = 500kHz
fCUTOFF = 10kHz
VIN = 0.5VRMS
FREQUENCY (kHz)
1
GAIN (dB)
1
2
17 19
1069-6 G04
0
–1
–2 5913 15
3711 21
VS = SINGLE 3V
VIN = 0.5VRMS
fCLK = 500kHz
fCUTOFF = 10kHz
fCLK = 750kHz
fCUTOFF = 15kHz
FREQUENCY (kHz)
1
GAIN (dB)
1
2
17 19
1069-6 G05
0
–1
–2 5913 15
3711 21
VS = SINGLE 5V
VIN = 1VRMS
fCLK
500kHz
fCUTOFF
10kHz
fCLK
750kHz
fCUTOFF
15kHz
fCLK
1MHz
fCUTOFF
20kHz
FREQUENCY (kHz)
1
–90
GAIN (db)
–70
–50
–30
–10
10 100
1069-6 G06
10
–80
–60
–40
–20
0fCLK = 500kHz
VIN = 0.5VRMS
SINGLE 5V
SINGLE 3V
FREQUENCY (kHz)
0
PHASE (DEG)
–630
–90
0
90
4810
1069-6 G07
–810
–270
–450
–720
–180
–900
–360
–540
2612 14
VS = SINGLE 5V
fCLK = 500kHz
fCUTOFF = 10kHz
FREQUENCY (kHz)
0
GROUP DELAY (SEC)
610
1069-6 G08
24 8
4.00E-04
3.50E-04
3.00E-04
2.50E-04
2.00E-04
1.50E-04
1.00E-04
5.00E-05
0.00E+00
12
VS = SINGLE 5V
fCLK = 500kHz
fCUTOFF = 10kHz
0.5V/DIV
VS = SINGLE 5V
fCLK = 1MHz
fIN = 1kHz
2Vp-p SQUARE WAVE
0.1ms/DIV 1069-6 G09
LTC1069-6
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TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
Output Voltage Swing
vs Temperature
Dynamic Range THD + Noise
vs Input/Output Voltage
Dynamic Range THD + Noise
vs Input Voltage THD + Noise vs Frequency
INPUT/OUTPUT VOLTAGE (VP-P)
0.1
–90
THD + NOISE (dB)
–80
–70
–60
–50
13
1069-6 G14
–85
–75
–65
–55
–45
–40 fCLK = 170kHz
fCUTOFF = 3.4kHz
fIN = 1kHz
VIN = 2.945VP-P
INPUT VOLTAGE (VRMS)
0.1 0.5 0.76 1.43
–90
THD + NOISE (dB)
–80
–70
–60
–50
15
1069-6 G10
–85
–75
–65
–55
–45
–40 fCLK = 500kHz
fIN = 1kHz
VS = SINGLE 3V
VS =
SINGLE 5V
FREQUENCY (kHz)
1510
1069-6 G11
–90
THD + NOISE (dB)
–80
–70
–60
–50
–85
–75
–65
–55
–45
–40 fCLK = 500kHz
fCUTOFF = 10kHz
VS = SINGLE 3V
VIN = 0.5VRMS
VS = SINGLE 5V
VIN = 1VRMS
TOTAL SUPPLY VOLTAGE (V)
0
0
SUPPLY CURRENT (mA)
2
5
4810
1069-6 G12
1
4
3
26 12 14 16
85°C
–40°C
25°C
AMBIENT TEMPERATURE (°C)
–40–200 20406080
0
POSITIVE SWING (V)NEGATIVE SWING (mV)
20
40
60
80
4.5
2.5
4.0
2.0
1069-6 G13
RL = 10k
VS = SINGLE 5V
VS = SINGLE 3V
VS = SINGLE 3V
VS = SINGLE 5V
PIN FUNCTIONS
AGND (Pin 1): Analog Ground. The quality of the analog
signal ground can affect the fi lter 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 single supply operation, Pin 1 should
be bypassed to the analog ground plane with a 0.47μF
capacitor or larger. An internal resistive divider biases
Pin 1 to 0.4366 times the total power supply of the device
(Figure 1). That is, with a single 5V supply, the potential
at Pin 1 is 2.183V ±1%. As the LTC1069-6 is optimized
V+
NC
VIN
VOUT
V–
1
2
3
4
8
7
6
5
NC
CLK
LTC1069-6
1069-6 F01
AGND
11.325k 8.775k
Figure 1. Internal Biasing of the Analog Ground (Pin 1)
LTC1069-6
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PIN FUNCTIONS
for single supply operation, the internal biasing of Pin 1
allows optimum output swing. The AGND pin should be
buffered if used to bias other ICs. Figure 2 shows the
connections for single supply operation.
AGND
V+
V+
NC
VIN
VIN
VOUT VOUT
V–
1
2
3
4
8
7
6
5
1k
NC
CLK
LTC1069-6
ANALOG GROUND PLANE
DIGITAL
GROUND
PLANE
0.47μF
0.1μF
1069-6 F02
CLOCK
SOURCE
STAR
SYSTEM
GROUND
V+, V– (Pins 2, 7): Power Supply Pins. The V+ (Pin 2)
and the V– (Pin 7, if used) should be bypassed with a
0.1μF capacitor to an adequate analog ground. The fi lter’s
power supplies should be isolated from other digital or
high voltage analog supplies. A low noise linear supply is
recommended. Switching power supplies will lower the
signal-to-noise ratio of the fi lter. Unlike previous monolithic
fi lters, 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 3 shows the connection for
dual supply operation.
AGND
V+
V+
NC
VIN
VIN
VOUT VOUT
V–V–
1
2
3
4
8
7
6
5
1k
NC
CLK
LTC1069-6
ANALOG GROUND PLANE
DIGITAL
GROUND
PLANE
STAR
SYSTEM
GROUND
0.1μF 0.1μF
1069-6 F03
CLOCK
SOURCE
Figure 2. Connections for Single Supply Operation
Figure 3. 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 Pin. The Filter Input pin is internally
connected to the inverting input of an op amp through a
50k resistor.
CLK (Pin 5): Clock Input Pin. 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 fi lter’s power supply. The analog ground of the fi lter
should be connected to the clock’s ground at a single
point only. 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 frequencies 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).
Table 1. Clock Source High and Low Thresholds
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
Single Supply = 3.3V 1.2V 0.5V
VOUT (Pin 8): Filter Output Pin. Pin 8 is the output of the
fi lter, and it can source 8mA or sink 1mA. The total harmonic
distortion of the fi lter will degrade when driving coaxial
cables or loads less than 20k without an output buffer.
LTC1069-6
7
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APPLICATIONS INFORMATION
Temperature Behavior
The power supply current of the LTC1069-6 has a positive
temperature coeffi cient. The GBW product of its internal
op amps is nearly constant and the speed of the device
does not degrade at high temperatures. Figures 4a, 4b
and 4c show the behavior of the passband of the device
for various supplies and temperatures. The fi lter has a
passband behavior which is temperature independent.
Clock Feedthrough
The clock feedthrough is defi ned as the RMS value of the
clock frequency and its harmonics that are present at the
fi lter’s Output (Pin 8). The clock feedthrough is tested with
the Input (Pin 4) shorted to AGND (Pin 1) 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 in Table 2.
Table 2. Clock Feedthrough
VSCLOCK FEEDTHROUGH
3.3V 100μVRMS
5V 170μVRMS
10V 350μVRMS
Any parasitic switching transients during the rising and
falling edges of the incoming clock are not part of the
clock feedthrough specifi cations. 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 fi lter at the Output (Pin 8).
FREQUENCY (kHz)
1
GAIN (dB)
1
2
17
1069-6 F04a
0
–1
–2 5913
319
711 15 21
VS = SINGLE 3V
VIN = 0.5VRMS
fCLK = 500kHz
fCUTOFF = 10kHz
85°C
–40°C
Figure 4a
FREQUENCY (kHz)
1
GAIN (dB)
1
2
17
1069-6 F04a
0
–1
–2 5913
319
711 15 21
VS = SINGLE 5V
VIN = 1VRMS
fCLK = 750kHz
fCUTOFF = 15kHz
85°C
–40°C
FREQUENCY (kHz)
1
GAIN (dB)
1
2
25
1069-6 F04c
0
–1
–2 713 19
428
10 16 22 31
VS = ±5V
VIN = 1.5VRMS
fCLK = 1MHz
fCUTOFF = 20kHz
85°C
–40°C
Figure 4b
Figure 4c
LTC1069-6
8
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Wideband Noise
The wideband noise of the fi lter is the total RMS value
of the device’s noise spectral density and determines the
operating signal-to-noise ratio. The frequency contents
of the wideband noise lie within the fi lter’s passband. The
wideband noise cannot be reduced by adding post fi ltering.
The total wideband noise is nearly independent of the
clock frequency and depends slightly on the power supply
voltage (see Table 3). The clock feedthrough specifi cations
are not part of the wideband noise.
Table 3. Wideband Noise
VSWIDEBAND NOISE
3.3V 118μVRMS
5V 123μVRMS
±5V 127μVRMS
APPLICATIONS INFORMATION
Aliasing
Aliasing is an inherent phenomenon of sampled data
systems and occurs for input frequencies approaching
the sampling frequency. The internal sampling frequency
of the LTC1069-6 is 100 times its cutoff frequency. For
instance, if a 98.5kHz, 100mVRMS signal is applied at
the input of an LTC1069-6 operating with a 50kHz clock,
a 1.5kHz, 484μVRMS alias signal will appear at the fi lter
output. Table 4 shows details.
Table 4. Aliasing (fCLK = 50kHz)
INPUT FREQUENCY
(VIN = 1VRMS)
(kHz)
OUTPUT LEVEL
(Relative to Input)
(dB)
OUTPUT FREQUENCY
(Aliased Frequency)
(kHz)
fCLK/fC = 50:1, fCUTOFF = 1kHz
96 (or 104) –78.3 4.0
97 (or 103) –70.4 3.0
98 (or 102) –80.6 2.0
98.5 (or 101.5) –46.3 1.5
99 (or 101) –2.8 1.0
99.5 (or 100.5) –1.38 0.5
LTC1069-6
9
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.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)s 45°
0°– 8° TYP
.008 – .010
(0.203 – 0.254)
SO8 0303
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
1234
.150 – .157
(3.810 – 3.988)
NOTE 3
8765
.189 – .197
(4.801 – 5.004)
NOTE 3
.228 – .244
(5.791 – 6.197)
.245
MIN .160 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005
.050 BSC
.030 ±.005
TYP
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
PACKAGE DESCRIPTION
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
LTC1069-6
10
10696fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2008
LT 0309 REV A • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LTC1068 Very Low Noise, High Accuracy, Quad Universal Filter Building Block User-Confi gurable, SSOP Package
LTC1069-1 Low Power, Progressive Elliptic LPF fCLK/fC Ratio 100:1, 8-Pin SO Package
LTC1164-5 Low Power 8th Order Butterworth LPF fCLK/fC Ratio 100:1 and 50:1
LTC1164-6 Low Power 8th Order Elliptic LPF fCLK/fC Ratio 100:1 and 50:1
LTC1164-7 Low Power 8th Order Linear Phase LPF fCLK/fC Ratio 100:1 and 50:1
1
2
3
4
8
7
6
5
VOUT
V–
NC
CLK
AGND
V+
NC
VIN
0.1μF
0.47μF
ON SHUTDOWN
5V
VIN
VOUT
1069-6 TA03
LTC1069-6
fCLK ≤
750kHz 5V
0V
1
2
3
4
8
7
6
5
VOUT
V–
NC
CLK
AGND
V+
NC
VIN
0.1μF
0.47μF
VIN
VOUT
1069-6 TA04
LTC1069-6
fCLK
500kHz 3.3V
0V
–
+
1/2 LT1366
3.3V
0.1μF
5
6
8
4
7
1
2
3
4
8
7
6
5
VOUT
V–
NC
CLK
AGND
V+
NC
VIN
0.1μF
1μF 3V
3V
10k
40.2k 1069-6 TA05
LTC1069-6
170kHz
5
6
2
3
7
8
–
+
1/2 LT1366
0.1μF
40.2k
1
4
–
+
1/2 LT1366
270pF
10k
Single 5V Operation with Power Shutdown
Single 3V Supply Operation with Output Buffer
Single 3V Supply Voice Band Lowpass Filter with Rail-to-Rail Input and Output
