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LTC1264-7CSW#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC1264-7
12647fa
1
Linear Phase, Group Delay
Equalized, 8th Order
Lowpass Filter
■
Steeper Roll-Off Than Bessel Filters
■
High Speed: f
C
≤ 200kHz
■
Phase Equalized Filter in a 14-Pin Package
■
Phase and Group Delay Response Fully Tested
■
Transient Response Exhibits 5% Overshoot and
No Ringing
■
65dB THD or Better Throughout a 100kHz Passband
■
No External Components Needed
■
Available in Plastic 14-Pin DIP and 16-Pin SO
Wide Packages
The LTC1264-7 is a 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 equiva-
lent 8th order Bessel filter. For instance, at twice the cutoff
frequency, the filter attains 28dB attenuation (vs 12dB for
Bessel), while at three times the cutoff frequency, the filter
attains 55dB attenuation (vs 30dB for Bessel).
The cutoff frequency of the LTC1264-7 is tuned via an
external TTL or CMOS clock. The clock-to-cutoff
frequency ratio of the LTC1264-7 can be set to 25:1 (pin
10 to V
+
) or 50:1 (pin 10 to V
–
). When the filter operates
at clock-to-cutoff frequency ratio of 25:1, the input is
double-sampled to lower the risk of aliasing.
The LTC1264-7 is optimized for speed. Depending on the
operating conditions, cutoff frequencies between 200kHz
and 250kHz can be obtained. (Please refer to the Passband
vs Clock Frequency graphs.)
The LTC1264-7 is pin-compatible with the LTC1064-X
series.
■
Data Communication Filters
■
Time Delay Networks
■
Phase Matched Filters
200kHz Linear Phase Lowpass Filter
4-Level PAM Eye Diagram
1264-7 TA02
500ns/DIV
1V/DIV
f
CLK
= 5MHz
f
C
= 200kHz
LTC1264-7
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
1
2
3
4
5
6
7
14
13
12
11
10
9
8
LTC1264-7
V
IN
8V
–8V
f
CLK
= 5MHz
8V
V
OUT
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.
1264-7 TA01
LTC1264-7
12647fa
2
Operating Temperature Range
LTC1264-7C ...................................... – 40°C to 85°C
LTC1264-7M (OBSOLETE) .............. – 55°C to 125°C
Lead Temperature (Soldering, 10 sec)................. 300°C
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
Total Supply Voltage (V
+
to V
–
) .......................... 16.5V
Power Dissipation............................................. 400mW
Burn-In Voltage ................................................... 16.5V
Voltage at Any Input ..... (V
–
– 0.3V) ≤ V
IN
≤ (V
+
+ 0.3V)
Storage Temperature Range ............... – 65°C to 150°C
(Note 1)
E
LECTR
IC
AL C CHARA TERIST
ICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. V
S
= ±7.5V, R
L
= 10k, f
CUTOFF
= 100kHz or 50kHz, f
CLK
= 2.5MHz, TTL or
CMOS level (maximum clock rise or fall time ≤ 1µs) and all gain measurements are referenced to passband gain, unless otherwise
specified.
WU
U
PACKAGE
/
O
RDER I FOR ATIO
ORDER PART
NUMBER
LTC1264-7CN
ORDER PART
NUMBER
LTC1264-7CSW
T
JMAX
= 110°C, θ
JA
= 65°C/W (N )
T
JMAX
= 110°C, θ
JA
= 85°C/W
T
JMAX
= 150°C, θ
JA
= 65°C/W (J )
J PACKAGE
14-LEAD CERAMIC DIP
OBSOLETE PACKAGE
Consider the N14 Package for Alternate Source
LTC1264-7CJ
LTC1264-7MJ
Consult LTC Marketing for parts specified with wider operating temperature ranges.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Passband Gain 0.1Hz ≤ f ≤ 0.25 f
CUTOFF
f
TEST
= 25kHz, (f
CLK
/f
C
) = 25:1 ● – 0.50 – 0.10 0.50 dB
Gain at 0.50 f
CUTOFF
(Note 4) f
TEST
= 50kHz, (f
CLK
/f
C
) = 25:1 ● – 0.50 0.20 dB
f
TEST
= 25kHz, (f
CLK
/f
C
) = 50:1 ● – 0.65 – 0.15 0.30 dB
Gain at 0.75 f
CUTOFF
f
TEST
= 75kHz, (f
CLK
/f
C
) = 25:1 ● –1.5 –1.0 0.1 dB
Gain at f
CUTOFF
f
TEST
= 100kHz, (f
CLK
/f
C
) = 25:1 ● – 3.7 – 3.0 –1.9 dB
f
TEST
= 50kHz, (f
CLK
/f
C
) = 50:1 ● – 4.5 – 3.0 – 2.3 dB
Gain at 2.0 f
CUTOFF
f
TEST
= 200kHz, (f
CLK
/f
C
) = 25:1 ● –34 –28 –20 dB
f
TEST
= 100kHz, (f
CLK
/f
C
) = 50:1 ● –34 –30 –27 dB
Gain with f
CLK
= 20kHz f
TEST
= 200Hz, (f
CLK
/f
C
) = 50:1 –0.7 – 0.3 0.1 dB
Gain with f
CLK
= 400kHz, V
S
= ±2.375V f
TEST
= 8kHz, (f
CLK
/f
C
) = 25:1 –0.2 0.15 0.5 dB
f
TEST
= 16kHz, (f
CLK
/f
C
) = 25:1 –3.5 – 2.70 –1.4 dB
Gain with f
CLK
= 4MHz f
TEST
= 160kHz, V
IN
= 1V
RMS
(f
CLK
/f
C
) = 25:1, T
A
= 0°C to 70°C0.00±1.0 dB
(f
CLK
/f
C
) = 25:1 ● 3.0 dB
1
2
3
4
5
6
7
TOP VIEW
14
13
12
11
10
9
8
NC
V
IN
GND
V
+
NC
LP (A)
R
IN
(A)
OUT (C)
NC
V
–
f
CLK
25/50
V
OUT
NC
N PACKAGE
14-LEAD PLASTIC DIP
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
+
NC
NC
LP (A)
R
IN
(A)
OUT (C)
NC
V
–
NC
f
CLK
25/50
NC
V
OUT
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/
LTC1264-7
12647fa
3
E
LECTR
IC
AL C CHARA TERIST
ICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Phase Factor (
F
)(f
CLK
/f
C
) = 25:1, f ≤ f
CUTOFF
407 ± 2 Deg
Phase = 180° –
F
(f/f
C
)(f
CLK
/f
C
) = 50:1, f ≤ f
CUTOFF
388 ± 2 Deg
(Note 2) (f
CLK
/f
C
) = 25:1, f ≤ f
CUTOFF
● 392 423 Deg
(f
CLK
/f
C
) = 50:1, f ≤ f
CUTOFF
● 374 414 Deg
Phase Nonlinearity (f
CLK
/f
C
) = 25:1, f ≤ f
CUTOFF
±1.0 %
(Note 2) (f
CLK
/f
C
) = 50:1, f ≤ f
CUTOFF
±1.0 %
(f
CLK
/f
C
) = 25:1, f ≤ f
CUTOFF
● ± 2.0 %
(f
CLK
/f
C
) = 50:1, f ≤ f
CUTOFF
● ± 2.0 %
Group Delay (t
d
)(f
CLK
/f
C
) = 25:1, f ≤ f
CUTOFF
11.3 µs
t
d
= (
F
/ 360)(1/f
C
); (f
CLK
/f
C
) = 50:1, f ≤ f
CUTOFF
21.6 µs
(Note 3, 4) (f
CLK
/f
C
) = 25:1, f ≤ f
CUTOFF
● 10.9 11.7 µs
(f
CLK
/f
C
) = 50:1, f ≤ f
CUTOFF
● 20.8 22.9 µs
Group Delay Ripple (f
CLK
/f
C
) = 25:1, f ≤ f
CUTOFF
±1.0 %
(Note 3) (f
CLK
/f
C
) = 50:1, f ≤ f
CUTOFF
±1.0 %
(f
CLK
/f
C
) = 25:1, f ≤ f
CUTOFF
● ± 2.0 %
(f
CLK
/f
C
) = 50:1, f ≤ f
CUTOFF
● ± 2.0 %
Input Frequency Range (f
CLK
/f
C
) = 25:1 <f
CLK
kHz
(Table 9, 10) (f
CLK
/f
C
) = 50:1 <f
CLK
/2 kHz
Maximum f
CLK
V
S
= Single 5V (GND = 2V) 2 MHz
V
S
= ±5V 3 MHz
V
S
= ± 7.5V 5 MHz
Clock Feedthrough 25:1, ±7.5V, f = f
CLK
120 µV
RMS
Wideband Noise V
S
= Single 5V 140 ± 5% µV
RMS
(1Hz ≤ f < f
CLK
)V
S
= ±5V 160 ± 5% µV
RMS
V
S
= ± 7.5V 175 ± 5% µV
RMS
Input Impedance 45 65 87 kΩ
Output DC Voltage Swing V
S
= ±2.375V ±1.0 V
(Note 5) V
S
= ±5V ● ±2.0 ±2.3 V
V
S
= ±7.5V ● ±3.0 ±3.8 V
Output DC Offset 25:1, V
S
= ±5V ±100 ±220 mV
(f
CLK
= 1MHz) 50:1, V
S
= ±5V ±100 ±220 mV
Output DC Offset TempCo 25:1, V
S
= ±5V ±200 µV/°C
50:1, V
S
= ±5V ±200 µV/°C
Power Supply Current V
S
= ±2.375V 11 22 mA
(f
CLK
= 1MHz) ● 22 mA
V
S
= ±5V 14 23 mA
● 26 mA
V
S
= ±7.5V 17 28 mA
● 32 mA
Power Supply Range ±2.375 ±8V
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
= 100kHz or 50kHz, f
CLK
= 2.5MHz, TTL or
CMOS level (maximum clock rise or fall time ≤ 1µs) and all gain measurements are referenced to passband gain, unless otherwise
specified.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC1264-7CSW#TRPBF

Mfr. #:
Buy LTC1264-7CSW#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Active Filter 250kHz Phase Corrected Lowpass Filter
Lifecycle:
New from this manufacturer.
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