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LTC1164-7CSW#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LTC1164-7
11647fb
APPLICATIO S
U
DESCRIPTIO
U
FEATURES
TYPICAL APPLICATIO
U
Low Power, Linear Phase
8th Order Lowpass Filter
■
Better Than Bessel Roll-Off
■
f
CUTOFF
up to 20kHz, Single 5V Supply
■
I
SUPPLY
= 2.5mA (Typ), Single 5V Supply
■
75dB THD + Noise with Single 5V Supply
■
Phase and Group Delay Response Fully Tested
■
Transient Response with No Ringing
■
Wide Dynamic Range
■
No External Components Needed
■
Available in 14-Lead N and 16-Lead SW Packages
The LTC1164-7 is a low power, clock-tunable monolithic
8th order lowpass filter with linear passband phase and
flat group delay. The amplitude response approximates a
maximally flat passband and exhibits steeper roll-off than
an equivalent 8th order Bessel filter. For instance, at twice
the cutoff frequency the filter attains 34dB attenuation
(vs12dB for Bessel), while at three times the cutoff fre-
quency the filter attains 68dB attenuation (vs 30dB for
Bessel). The cutoff frequency of the LTC1164-7 is tuned
via an external TTL or CMOS clock.
Low power is achieved without sacrificing dynamic range.
With single 5V supply, the S/N + THD is up to 75dB.
Optimum 91dB S/N is obtained with ±7.5V supplies.
The clock-to-cutoff frequency ratio of the LTC1164-7 can
be set to 50:1 (Pin 10 to V
+
) or 100:1 (Pin 10 to V
–
).
When the filter operates at the clock-to-cutoff frequency
ratio of 50:1, the input is double-sampled to lower the risk
of aliasing.
The LTC1164-7 is pin-compatible with the LTC1064-X
series and LTC1264-7.
10kHz Linear Phase Lowpass Filter
Frequency Response
■
Data Communication Filters
■
Time Delay Networks
■
Phase Matched Filters
1
2
3
4
5
6
7
14
13
12
11
10
9
8
LTC1164-7
V
IN
5V
–5V
CLK = 500kHz
5V
V
OUT
1164-7 TA01
NOTE: THE POWER SUPPLIES SHOULD BE BYPASSED
BY A 0.1µF CAPACITOR CLOSE TO THE PACKAGE
AND ANY PRINTED CIRCUIT BOARD ASSEMBLY
SHOULD MAINTAIN A DISTANCE OF AT LEAST 0.2
INCHES BETWEEN ANY OUTPUT OR INPUT PIN AND
THE f
CLK
LINE.
FREQUENCY (kHz)
1
GAIN (dB)
0
–10
–20
–30
–40
–50
–60
–70
–80
10 100
1164-7 TA02
150
140
130
120
110
100
90
80
70
DELAY (µs)
DELAY
GAIN
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
2
LTC1164-7
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A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
Total Supply Voltage (V
+
to V
–
) ............................. 16V
Power Dissipation............................................. 400mW
Burn-In Voltage ...................................................... 16V
Voltage at Any Input ..... (V
–
– 0.3V) ≤ V
IN
≤ (V
+
+ 0.3V)
Storage Temperature Range ................ – 65°C to 150°C
Operating Temperature Range
LTC1164-7C ...................................... – 40°C to 85°C
LTC1164-7M ................................... – 55°C to 125°C
Lead Temperature (Soldering, 10 sec)................. 300°C
E
LECTR
IC
AL C CHARA TERIST
ICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Passband Gain 0.1Hz ≤ f ≤ 0.25 f
CUTOFF
f
TEST
= 2kHz, (f
CLK
/f
C
) = 50:1 ● – 0.50 – 0.10 0.30 dB
Gain at 0.50 f
CUTOFF
f
TEST
= 4kHz, (f
CLK
/f
C
) = 50:1 ● – 0.50 – 0.20 0.30 dB
f
TEST
= 2kHz, (f
CLK
/f
C
) = 100:1 ● – 0.85 – 0.65 0.15 dB
Gain at 0.75 f
CUTOFF
f
TEST
= 6kHz, (f
CLK
/f
C
) = 50:1 ● –1.2 –1.1 0.1 dB
Gain at f
CUTOFF
f
TEST
= 8kHz, (f
CLK
/f
C
) = 50:1 ● – 4.1 – 3.4 –1.9 dB
f
TEST
= 4kHz, (f
CLK
/f
C
) = 100:1 ● – 5.5 – 5.2 – 2.5 dB
Gain at 2.0 f
CUTOFF
f
TEST
= 16kHz, (f
CLK
/f
C
) = 50:1 ● –37 –34 –30 dB
f
TEST
= 8kHz, (f
CLK
/f
C
) = 100:1 ● –38 –34 –30 dB
Gain with f
CLK
= 20kHz f
TEST
= 200Hz, (f
CLK
/f
C
) = 100:1 –5.7 – 5.2 – 2.5 dB
Gain with f
CLK
= 400kHz, V
S
= ±2.375V f
TEST
= 4kHz, (f
CLK
/f
C
) = 50:1 – 0.50 –0.2 0.2 dB
f
TEST
= 8kHz, (f
CLK
/f
C
) = 50:1 – 3.75 –3.4 – 2.5 dB
Phase Factor (
F
) 0.1Hz ≤ f ≤ f
CUTOFF
Phase = 180° –
F
(f/f
C
) (f
CLK
/f
C
) = 50:1 435 ± 2 Deg
(Note 2) (f
CLK
/f
C
) = 100:1 428 ± 2 Deg
(f
CLK
/f
C
) = 50:1 ● 430 442 Deg
(f
CLK
/f
C
) = 100:1 ● 423 434 Deg
Phase Nonlinearity (f
CLK
/f
C
) = 50:1 ±1.0 %
(Note 2) (f
CLK
/f
C
) = 100:1 ±1.0 %
(f
CLK
/f
C
) = 50:1 ● ± 2.0 %
(f
CLK
/f
C
) = 100:1 ● ± 2.5 %
WU
U
PACKAGE
/
O
RDER I FOR ATIO
T
JMAX
= 110°C, θ
JA
= 85°C/W
T
JMAX
= 150°C, θ
JA
= 65°C/W (J)
T
JMAX
= 110°C, θ
JA
= 65°C/W (N)
1
2
3
4
5
6
7
TOP VIEW
N PACKAGE
14-LEAD PLASTIC DIP
14
13
12
11
10
9
8
NC
V
IN
GND
V
+
GND
LP6
CONNECT 1
CONNECT 2
NC
V
–
f
CLK
50/100
V
OUT
NC
TOP VIEW
SW PACKAGE
16-LEAD PLASTIC SO (WIDE)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
V
IN
GND
V
+
GND
NC
LP6
CONNECT 1
CONNECT 2
NC
V
–
NC
f
CLK
50/100
NC
V
OUT
ORDER PART
NUMBER
LTC1164-7CSW
ORDER PART
NUMBER
(Note 1)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
S
= ±7.5V, R
L
= 10k, f
CUTOFF
= 8kHz or 4kHz, f
CLK
= 400kHz, TTL or CMOS
level and all gain measurements are referenced to passband gain, unless otherwise specified. (Maximum clock rise or fall time ≤ 1µs.)
The filter cutoff frequency is abbreviated as f
CUTOFF
or f
C
.
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consider the N Package as an Alternate Source
T
JMAX
= 150°C, θ
JA
= 65°C/W (J)
J PACKAGE 14-LEAD CERAMIC DIP
OBSOLETE PACKAGE
LTC1164-7CN
LTC1164-7CJ
LTC1164-7MJ
3
LTC1164-7
11647fb
E
LECTR
IC
AL C CHARA TERIST
ICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Group Delay (t
d
)(f
CLK
/f
C
) = 50:1, f ≥ f
CUTOFF
151.0 ± 1 µs
t
d
= (1/360)(f/f
C
)(f
CLK
/f
C
) = 100:1, f ≥ f
CUTOFF
297.2 ± 1 µs
(Note 3) (f
CLK
/f
C
) = 50:1, f ≥ f
CUTOFF
● 149.3 153.5 µs
(f
CLK
/f
C
) = 100:1, f ≥ f
CUTOFF
● 293.8 301.4 µs
Group Delay Deviation (f
CLK
/f
C
) = 50:1, f ≥ f
CUTOFF
±1.0 %
(Note 3) (f
CLK
/f
C
) = 100:1, f ≥ f
CUTOFF
±1.0 %
(f
CLK
/f
C
) = 50:1, f ≥ f
CUTOFF
● ± 2.0 %
(f
CLK
/f
C
) = 100:1, f ≥ f
CUTOFF
● ± 2.5 %
Input Frequency Range (Table 9) (f
CLK
/f
C
) = 50:1 <f
CLK
kHz
(f
CLK
/f
C
) = 100:1 <f
CLK
/2 kHz
Maximum f
CLK
V
S
= Single 5V (Pins 3 and 5 at 2V) 1 MHz
V
S
= ±5V 1 MHz
V
S
= ± 7.5V 1 MHz
Clock Feedthrough (f = f
CLK
) 50:1, ±5V, Input at GND 100 µV
RMS
Wideband Noise V
S
= ±2.5V 95 ± 5% µV
RMS
(1Hz ≤ f < f
CLK
)V
S
= ±5V 105 ± 5% µV
RMS
V
S
= ± 7.5V 115 ± 5% µV
RMS
Input Impedance 35 55 90 kΩ
Output DC Voltage Swing (Note 4) V
S
= ±2.375V ±1.25 ±1.4 V
V
S
= ±5V ● ±3.70 ±3.9 V
V
S
= ±7.5V ● ±5.40 ±6.1 V
Output DC Offset 50:1, V
S
= ±5V ±100 ±220 mV
100:1, V
S
= ±5V ±100 mV
Output DC Offset TempCo 50:1, V
S
= ±5V ±200 µV/°C
100:1, V
S
= ±5V ±200 µV/°C
Power Supply Current V
S
= ±2.375V, T
A
= 25°C 2.5 4.0 mA
● 4.5 mA
V
S
= ±5V, T
A
= 25°C 4.5 7.0 mA
● 8.0 mA
V
S
= ±7.5V, T
A
= 25°C 7.0 11.0 mA
● 12.5 mA
Power Supply Range ±2.375 ±8V
Note 1: Absolute Maximum Ratings are those values beyond which the life of a
device may be impaired.
Note 2: Input frequencies, f, are linearly phase shifted through the filter as long as
f ≤ f
C
; f
C
= cutoff frequency.
Figure 1 curve shows the typical phase response of an LTC1164-7 operating at
f
CLK
= 400kHz, f
C
= 8kHz and it closely matches an ideal straight line. The phase
shift is described by: phase shift = 180° –
F
(f/f
C
); f ≤ f
C
.
F
is arbitrarily called the “phase factor” expressed in degrees. The phase factor
together with the specified deviation from the ideal straight line allows the
calculation of the phase at a given frequency. Example: The phase shift at 7kHz of
the LTC1164-7 shown in Figure 1 is: phase shift = 180° – 434° (7kHz/10kHz) ±
nonlinearity = –123.8° ± 1% or –123.9°± 1.24°.
Note 3: Group delay and group delay deviation are calculated from the measured
phase factor and phase deviation specifications.
Note 4: The AC swing is typically 11V
P-P
, 7V
P-P
, 2.8V
P-P
for ± 7.5V, ± 5V, ±2.5V
supply respectively. For more information refer to the THD + Noise vs Input graphs.
Figure 1. Phase Response in the Passband (Note 1)
The
● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
S
= ±7.5V, R
L
= 10k, f
CUTOFF
= 8kHz or 4kHz, f
CLK
= 400kHz, TTL or CMOS
level and all gain measurements are referenced to passband gain, unless otherwise specified. (Maximum clock rise or fall time ≤ 1µs.)
The filter cutoff frequency is abbreviated as f
CUTOFF
or f
C
.
FREQUENCY (kHz)
0
–360
PHASE (DEG)
–270
–180
–90
0
90
180
2468
1164-7 F01
1013579
f
CLK
= 500kHz
(f
CLK
/f
C
) = 50:1
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LTC1164-7CSW#PBF

Mfr. #:
Buy LTC1164-7CSW#PBF
Manufacturer:
Analog Devices Inc.
Description:
Active Filter L/P Clk Sweepable Linear Phase Filter
Lifecycle:
New from this manufacturer.
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