LTC1069-7CS8#PBF [Linear]
LTC1069-7 - Linear Phase 8th Order Lowpass Filter; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C;
| 型号： | LTC1069-7CS8#PBF |
| 厂家： | 
Linear |
| 描述： | LTC1069-7 - Linear Phase 8th Order Lowpass 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10页 (文件大小：160K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1069-7
Linear Phase
8th Order Lowpass Filter
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.
FEATURES
n
8th Order, Linear Phase Filter in SO-8 Package
Raised Cosine Amplitude Response
–43dB Attenuation at 2× f
Wideband Noise: 140μV
n
n
CUTOFF
n
RMS
n
Operates from Single 5V Supply to
5V ꢀower Supplies
Clock-Tunable to 200kHz with 5V Supplies
Clock-Tunable to 120kHz with Single 5V Supply
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.
n
n
APPLICATIONS
n
Digital Communication Filter
The LTC1069-7 has a wide dynamic range. With 5V
n
Antialiasing Filter with Linear ꢀhase
supplies and an input range of 0.1V
to 2V
, the
RMS
RMS
n
Smoothing Filters
signal-to-(noise+THD)ratiois≥ 60dB.Thewidebandnoise
oftheLTC1069-7is140μV .UnlikeotherLTC1069-Xfilters,
RMS
DESCRIPTION
the typical passband gain of the LTC1069-7 is equal to –1V/V.
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
alphaofone. Thegainatthecutofffrequencyis–3dBand
the attenuation at twice the cutoff frequency is 43dB. The
The LTC1069-7 is available in an SO-8 package.
Otherfilterresponseswithlowerpower/speedspecifications
can be obtained. ꢀlease contact LTC Marketing.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Frequency Response
10
0
Single 5V Supply, Linear Phase 100kHz Lowpass Filter
AGND
V
V
OUT
OUT
–10
–20
–30
–40
–50
–60
–70
5V
IN
+
–
0.47μF
V
V
0.1μF
LTC1069-7
NC
NC
f
= 2.5MHz
1069-7 TA01
V
V
CLK
CLK
IN
10
100
1000
FREQUENCY (kHz)
1069-7 TA02
10697fa
1
LTC1069-7
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V to V ) ............................... 12V
ꢀower 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
PIN CONFIGURATION
+
–
TOꢀ VIEW
AGND
1
2
3
4
8
7
6
5
V
V
OUT
–
+
V
NC
NC
V
CLK
IN
S8 ꢀACKAGE
8-LEAD ꢀLASTIC SO
= 125°C, θ = 130°C/W
T
JMAX
JA
ORDER INFORMATION
LEAD FREE FINISH
LTC1069-7CS8#ꢀBF
LTC1069-7IS8#ꢀBF
TAPE AND REEL
PART MARKING
10697
PACKAGE DESCRIPTION
8-Lead ꢀlastic SO
TEMPERATURE RANGE
LTC1069-7CS8#TRꢀBF
LTC1069-7IS8#TRꢀBF
0°C to 70°C
10697I
8-Lead ꢀlastic SO
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating
temperature range. 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.
SYMBOL
ꢀassband Gain (f ≤ 0.2f
CONDITIONS
V = 5V, f = 2.5MHz
CLK
MIN
TYP
–0.10
MAX UNITS
)
0.75
0.90
dB
dB
IN
CUTOFF
S
l
l
l
l
l
l
l
l
l
l
f
= 1kHz, V = 1V
IN RMS
TEST
V = 4.75V, f
TEST
= 500kHz
CLK
–0.10
–0.30
–0.05
–1.0
0.75
0.90
dB
dB
S
f
= 1kHz, V = 0.5V
IN RMS
Gain at 0.25f
Gain at 0.50f
Gain at 0.75f
V = 5V, f = 2.5MHz
CLK
dB
dB
CUTOFF
CUTOFF
CUTOFF
S
TEST
f
= 25kHz, V = 1V
RMS
–0.55
–0.1
0.15
–0.35
0
IN
V = 4.75V, f
TEST
= 500kHz
CLK
IN
dB
dB
S
f
= 5kHz, V = 0.5V
RMS
–0.30
–1.40
–0.60
–2.1
V = 5V, f
TEST
= 2.5MHz
dB
dB
S
CLK
f
= 50kHz, V = 1V
IN RMS
V = 4.75V, f
TEST
= 500kHz
CLK
–0.30
–1.65
–0.75
–3.5
dB
dB
S
f
= 10kHz, V = 0.5V
IN RMS
V = 5V, f
TEST
= 2.5MHz
dB
dB
S
CLK
–0.80
–0.25
–2.7
–2.4
f
= 75kHz, V = 1V
IN RMS
V = 4.75V, f
TEST
= 500kHz
CLK
dB
dB
S
–1.15
–4.0
f
= 15kHz, V = 0.5V
IN
RMS
Gain at f
V = 5V, f = 2.5MHz
CLK
dB
dB
CUTOFF
S
TEST
f
= 100kHz, V = 1V
IN
RMS
V = 4.75V, f
TEST
= 500kHz
CLK
–2.9
dB
dB
S
–3.3
f
= 20kHz, V = 0.5V
IN RMS
10697fa
2
LTC1069-7
ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating
temperature range. 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.
SYMBOL
CONDITIONS
V = 5V, f = 2.5MHz
CLK
MIN
TYP
–16.5
MAX UNITS
Gain at 1.5f
dB
dB
CUTOFF
CUTOFF
CUTOFF
S
–19
f
= 150kHz, V = 1V
RMS
–14
–17
–38
TEST
IN
V = 4.75V, f
TEST
= 500kHz
CLK
–18.1
–43
dB
dB
S
–20
–55
f
= 30kHz, V = 0.5V
IN
RMS
Gain at 2.0f
Gain at 5.0f
V = 5V, f
TEST
= 2.5MHz
dB
dB
S
CLK
f
= 200kHz, V = 1V
IN
RMS
V = 4.75V, f
TEST
= 500kHz
CLK
–41
dB
dB
S
–48
–70
–39
–55
f
= 40kHz, V = 0.5V
IN RMS
V = 4.75V, f
TEST
= 500kHz
CLK
–59
dB
S
f
= 100kHz, V = 0.5V
IN RMS
Gain at f
(160kHz)
V = 5V, f = 4MHz
CLK
TEST
–2.1
–30.5
–235
–3.0
dB
CUTOFF
S
f
= 160kHz, V = 1V
IN RMS
ꢀhase at 0.5f
V = 5V, f
CLK
TEST
= 2.5MHz
= 2.5MHz
= 500kHz
= 500kHz
–35
–25
Deg
Deg
Deg
CUTOFF
S
f
= 50kHz
ꢀhase at f
V = 5V, f
CLK
–240
–230
CUTOFF
S
TEST
f
= 100kHz
ꢀassband ꢀhase Deviation from
Linear ꢀhase (Note 1)
V = 5V, f
S
CLK
Output DC Offset (Input at GND)
V = 5V, f
S
50
25
mV
mV
S
CLK
125
V = 4.75V, f
= 400kHz
CLK
l
l
Output Voltage Swing
V = 5V, I
S
/I
≤ 1mA, R = 10k
3.5
2.6
4.0
3.6
V
ꢀ-ꢀ
S
SOURCE SINK
L
V = 4.75V, I
/I
≤ 1mA, R = 10k
V
SOURCE SINK
L
ꢀower Supply Current
V = 5V, f
= 500kHz
18
26
29
mA
mA
S
CLK
l
l
V = 4.75V, f
S
= 400kHz
CLK
13
15
16.5
mA
mA
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.
Example: An LTC1069-7 has ꢀhase at 0.5f
= –30.5° and ꢀhase at
CUTOFF
f
= –235°.
CUTOFF
ꢀassband ꢀhase Deviation from Linear ꢀhase
= 1/2[180° – (–235°)] – [(180° – (–30.5°)] = –3°
Note 2: ꢀhase Deviation = 1/2(ꢀhase at 0Hz – ꢀhase at f ) – (ꢀhase
CUTOFF
at 0Hz – ꢀhase at 0.5f
)
CUTOFF
ꢀhase at 0Hz = 180° (guaranteed by design)
10697fa
3
LTC1069-7
TYPICAL PERFORMANCE CHARACTERISTICS
Passband Gain vs Frequency
Transition Band Gain vs Frequency
Stopband Gain vs Frequency
10
0
1.0
0.5
–40
–42
–44
–46
–48
–50
–52
–54
–56
–58
–60
V
=
5V
V
=
5V
V
=
5V
S
S
S
f
f
= 500kHz
f
f
= 500kHz
f
f
= 500kHz
CLK
C
V
CLK
C
CLK
= 20kHz
= 2V
= 20kHz
= 20kHz
C
0
V
= 2V
V
= 2V
IN
RMS
IN
RMS
IN RMS
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
–10
–20
–30
–40
–50
1
3
5
7
9
11 13 15 17 19 21
41 45 49 53 57 61 65 69 73 77 81
21 23 25 27 29 31 33 35 37 39 41
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
1069-7 G01
1069-7 G03
1069-7 G02
Passband Gain
Gain vs Frequency
vs Clock Frequency
Passband Gain vs Frequency
10
0
1.0
0.5
3
0
V
f
C
V
= 5V
V
f
=
CLK
= 160kHz
= 2V
5V
S
S
= 250kHz
= 4MHz
CLK
f
= 5MHz
CLK
f
= 10kHz
f
C
0
= 1V
V
IN
RMS
IN
RMS
–10
–20
–30
–40
–50
–60
–3
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
T
= 85°C
A
–6
f
= 2.5MHz
CLK
f
= 4.5MHz
CLK
T
= –40°C
A
–9
f
f
= 4MHz
= 3.5MHz
CLK
T
= 25°C
A
CLK
–12
–15
–18
f
= 3MHz
CLK
V
V
= 5V
S
= 2V
IN
RMS
1
10
FREQUENCY (kHz)
100
10
40
70
100
130
160
20 40 60 80
140 160 180 200
100 120
FREQUENCY (kHz)
FREQUENCY (kHz)
1069-7 G04
1069-7 G06
1069-7 G05
Passband Gain
vs Clock Frequency
Gain vs Supply Voltage
Passband Gain vs Frequency
1.0
0.5
3
0
10
0
f
= 2MHz
V
V
= 5V
IN
CLK
C
IN
S
f
= 80kHz
= 0.5V
= 1V
RMS
V
0
RMS
T
= 85°C
A
–3
–10
–20
–30
–40
–50
–60
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
f
= 3MHz
CLK
–6
T
= –40°C
A
T
–9
= 25°C
A
f
= 2.5MHz
CLK
–12
–15
–18
V
= 5V
V
f
C
V
= 5V
S
S
= 2.5MHz
CLK
f
= 2MHz
CLK
V
= 5V
f
= 100kHz
S
= 1V
IN
RMS
f
= 1.5MHz
CLK
10 20 30 40 50 60 70 80 90 100
FREQUENCY (kHz)
10
70
110 130 150 170 190 210
20 40 60 80
140 160 180 200
30 50
90
100 120
FREQUENCY (kHz)
FREQUENCY (kHz)
1069-7 G09
1069-7 G07
1069-7 G08
10697fa
4
LTC1069-7
TYPICAL PERFORMANCE CHARACTERISTICS
Passband Gain and Phase
vs Frequency
Passband Gain and Delay
vs Frequency
2
1
13.5
2
1
180
135
90
V
f
C
=
CLK
= 100kHz
5V
= 2.5MHz
V
f
C
=
CLK
= 100kHz
5V
= 2.5MHz
S
S
f
f
0
13.0
12.5
12.0
11.5
11.0
0
–1
–2
–3
–4
–5
–6
–7
–8
–1
–2
–3
–4
–5
–6
–7
–8
45
GAIN
0
GAIN
–45
–90
–135
–180
–225
–270
ꢀHASE
DELAY
0
10 20 30 40 50 60 70 80 90 100
0
10 20 30 40 50 60 70 80 90 100
FREQUENCY (kHz)
FREQUENCY (kHz)
1069-7 G12
1069-7 G10
Phase Matching vs Frequency
THD + Noise vs Input (VP-P
)
THD + Noise vs Frequency
–40
–45
–50
–55
–60
–65
–70
–75
–40
–45
–50
–55
–60
–65
–70
–75
–80
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0
f
f
= 2.5MHz
f
f
f
= 1MHz
CLK
C
CLK
C
IN
70°C
= 100kHz
= 40kHz
= 1kHz
25°C
V
= 5V
S
V
V
= 5V, V = 1V
IN ꢀ-ꢀ
S
S
V
f
=
CLK
5V
S
≤ 2.5MHz
ꢀHASE DIFFERENCE BETWEEN
ANY TWO UNITS (SAMꢀLE OF
20 REꢀRESENTATIVE UNITS)
V
= 5V
S
=
5V, V = 2V
IN
ꢀ-ꢀ
0.1
1
10
1
10
100
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
INꢀUT (V )
FREQUENCY (kHz)
FREQUENCY (f
/FREQUENCY)
ꢀ-ꢀ
CUTOFF
1609-7 G13
1069-7 G11
1069-7 G14
Output Voltage Swing
vs Temperature
Transient Response
Output Offset vs Clock Frequency
–10
–15
–20
–25
–30
–35
–40
–45
–50
4.3
4.2
4.1
1.2
1.1
1.0
V
= 5V
S
V
= 5V (AGND AT 2.5V)
S
f
f
= 500kHz
CLK
CUTOFF
R
= 20kHz
= 10k
L
I
/I
≤ 1mA
V
=
5V
SOURCE SINK
S
1069-7 G15
V
=
5V
0.1ms/DIV
S
f
f
= 500kHz
CLK
CUTOFF
= 20kHz
0.25
1.25
2.25
3.25
4.25
5.25
40
100
V
= 4V
–40
0
20
60
–20
80
IN
ꢀ-ꢀ SQUARE WAVE AT 1kHZ
CLOCK FREQUENCY (MHz)
TEMꢀERATURE (°C)
1069-7 G16
1069-7 G17
10697fa
5
LTC1069-7
TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage Swing
vs Temperature
Supply Current
Supply Current
vs Supply Voltage
vs Clock Frequency
4.2
4.1
22
21
20
19
18
17
16
15
14
13
12
11
10
f
= 10Hz
CLK
25
20
15
10
5
85°C
25°C
V
= 5V
S
V
=
5V
S
4.0
–40°C
f
f
= 2.5MHz
CLK
CUTOFF
R
= 100kHz
= 10k
L
–4.5
–4.6
–4.7
I
/I
= 1mA
SOURCE SINK
V
= 5V
S
0
–40
0
20
40
60
80 100
0
1
2
3
4
5
6
–20
0.25
1.25
2.25
3.25
4.25
5.25
SUꢀꢀLY VOLTAGE ( V)
TEMꢀERATURE (°C)
CLOCK FREQUENCY (MHz)
1069-7 G18
1069-7 G19
1069-7 G20
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, ꢀin 1 should
be connected to the analog ground plane.
NC (Pins 3, 6): No Connection. ꢀins 3 and 6 are not
connected to any internal circuitry; they should be tied
to ground.
V
(Pin 4): Filter Input. The filter input pin is internally
IN
connected to the inverting inputs of two op amps through
a 36k resistor for each op amp. This parallel combination
creates an 18k input impedance.
For single supply operation, ꢀin 1 should be bypassed
to the analog ground plane with a capacitor 0.47μF or
larger. An internal resistive divider biases ꢀin 1 to half the
total power supply. ꢀin 1 should be buffered if used to
bias other ICs. Figure 1 shows the connections for single
supply operation.
ANALOG GROUND
ꢀLANE
1
2
3
4
8
7
6
5
AGND
V
V
OUT
OUT
0.47μF
+
+
–
V
V
V
LTC1069-7
0.1μF
V
NC
NC
V
CLK
IN
IN
+
–
–
+
V , V (Pins 2, 7): ꢀower Supplies. The V (ꢀin 2) and
V (ꢀin 7) should be bypassed with a 0.1μF capacitor to
DIGITAL
GROUND
ꢀLANE
STAR
SYSTEM
GROUND
1k
an adequate analog ground. The filter’s power supplies
shouldbeisolatedfromotherdigitalorhighvoltageanalog
supplies.Alownoiselinearsupplyisrecommended.Using
switching power supplies will lower the signal-to-noise
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.
CLOCK
SOURCE
1069-7 F01
Figure 1. Connections for Single Supply Operation
10697fa
6
LTC1069-7
PIN FUNCTIONS
a dual or single supply operation. A pulse generator can
be used as a clock source provided the high level on-time
ANALOG GROUND
ꢀLANE
1
8
7
6
5
AGND
V
OUT
V
is greater than 0.42μs (V = 5V). Sine waves less than
OUT
S
2
3
4
+
–
–
+
V
V
V
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.A1kresistorbetweentheclocksourceandthe
clock input (ꢀin 5) will slow down the rise and fall times
of the clock to further reduce charge coupling, Figure 1.
V
0.1μF
LTC1069-7
0.1μF
NC
NC
V
CLK
V
IN
IN
DIGITAL
STAR
SYSTEM
GROUND
GROUND
ꢀLANE
1k
CLOCK
SOURCE
Table 1. Clock Source High and Low Thresholds
1069 F02
POWER SUPPLY
HIGH LEVEL
1.5V
LOW LEVEL
0.5V
Figure 2. Connections for Dual Supply Operation
Dual Supply = 5V
Single Supply = 10V
Single Supply = 5V
6.5V
5.5V
CLK (Pin 5): Clock Input. Any TTL or CMOS clock source
with a square wave output and 50% duty cycle ( 10%) is
anadequateclocksourceforthedevice. Thepowersupply
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
1.5V
0.5V
V
OUT
(Pin 8): Filter Output. ꢀin 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.
APPLICATIONS INFORMATION
Temperature Behavior
Table 2. Clock Feedthrough
V
CLOCK FEEDTHROUGH
S
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.
5V
5V
400μV
850μV
RMS
RMS
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 (ꢀin 8) of
the LTC1069-7.
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 (ꢀin 8). The clock feedthrough is tested with
the input (ꢀin 4) shorted to the AGND pin and depends on
ꢀC 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.
10697fa
7
LTC1069-7
APPLICATIONS INFORMATION
Wideband Noise
input of an LTC1069-7 operating with a 50% duty cycle
25kHz clock, a 2kHz, 741μV
alias signal will appear
RMS
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 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.
at the filter output. Table 4 shows details.
Table 4. Aliasing
INPUT FREQUENCY
= 1V
OUTPUT LEVEL
Relative to Input
OUTPUT FREQUENCY
Aliased Frequency
V
IN
RMS
f
/f = 25:1, f
= 1kHz
CLK
C
CUTOFF
40kHz (or 60kHz)
47kHz (or 53kHz)
48kHz (or 52kHz)
48.5kHz (or 51.5kHz)
49kHz (or 52kHz)
49.5kHz (or 50.5kHz)
–59.9dB
–54.2dB
–42.6dB
–18.3dB
–2.9dB
10kHz
3kHz
2kHz
1.5kHz
1.0kHz
0.5kHz
Table 3. Wideband Noise
V
CLOCK FEEDTHROUGH
S
–0.65dB
4.75V
5V
125μV
140μV
RMS
RMS
Speed Limitations
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
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 f
instance if a 48kHz, 100mV
V
MAXIMUM CLOCK
≥ 2.5MHz
MAXIMUM V
IN
S
5V
5V
340mV
(f ≥ 200kHz)
RMS IN
frequency. For
CUTOFF
signal is applied at the
≥ 4.5MHz
1.2V
(f ≥ 400kHz)
RMS IN
RMS
10697fa
8
LTC1069-7
PACKAGE DESCRIPTION
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
.045 .005
NOTE 3
.050 BSC
7
5
8
6
.245
MIN
.160 .005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 .005
TYꢀ
1
3
4
2
RECOMMENDED SOLDER ꢀAD LAYOUT
.010 – .020
(0.254 – 0.508)
s 45°
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0°– 8° TYꢀ
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYꢀ
NOTE:
INCHES
1. DIMENSIONS IN
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR ꢀROTRUSIONS.
MOLD FLASH OR ꢀROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
SO8 0303
10697fa
9
LTC1069-7
TYPICAL APPLICATION
Clock Tunable, Noninverting, Linear Phase 8th Order Filter to 200kHz fCUTOFF
51pF
10k
5V
0.1μF
0.1μF
1μF
10k
–
+
AGND
V
OUT
5V
–5V
LT®1354
–5V
V
OUT
+
–
V
V
0.1μF
V
0.1μF
LTC1069-7
NC
NC
V
CLK
f
≤ 5MHz
IN
IN
CLK
1069-7 TA03
RELATED PARTS
PART NUMBER
LTC1064-3
LTC1064-7
LTC1164-7
LTC1264-7
DESCRIPTION
COMMENTS
Linear ꢀhase, Bessel 8th Order Filter
Linear ꢀhase, 8th Order Lowpass Filter
Low ꢀower, Linear ꢀhase Lowpass Filter
Linear ꢀhase 8th Order Lowpass Filter
f
f
f
f
/f = 75/1 or 150/1, Very Low Noise
C
CLK
CLK
CLK
CLK
/f = 50/1 or 100/1, f
C
= 100kHz
C(MAX)
/f = 50/1 or 100/1, I = 2.5mA, V = 5V
C
S
S
/f = 25/1 or 50/1, f
C
= 200kHz
C(MAX)
10697fa
LTC 0309 REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
10
●
●
© LINEAR TECHNOLOGY CORPORATION 2008
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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