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LTC1264CSW#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LTC1264
1264fb
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
High Speed, Quad Universal
Filter Building Block
■
High Speed, Up to 250kHz Center Frequency
■
Four Identical Filters in a 0.3" Wide Package
■
Clock-to-Center Frequency Ratio of 20:1
■
Double-Sampling, Improved Aliasing
■
Operates from ±2.37V to ±8V Power Supplies
■
Customized Version with Internal Resistors Available
■
Low Noise
■
Low Harmonic Distortion
■
Available in 24-Pin DIP and SO Wide Packages
The LTC
®
1264 consists of four identical, high speed 2nd
order switched-capacitor filter building blocks designed
for center frequencies up to 250kHz. Each building block,
together with three to five resistors, can provide 2nd order
functions like lowpass, highpass, bandpass and notch.
The center frequency of each 2nd order section is tuned via
an external clock. The clock-to-center frequency ratio is
internally set to 20:1, but it can be modified via external
resistors.
The aliasing performance of the LTC1264 is improved by
double-sampling each 2nd order section. Input signal
frequencies can reach up to twice the clock frequency
before any alias products will be detectable.
For Q ≤ 5 and for T
A
< 85°C, the maximum center
frequency is 160kHz. For Q ≤ 2, the maximum center
frequency is 250kHz. Up to 8th order filters can be realized
by cascading all four 2nd order sections.
A customized monolithic version of the LTC1264 includ-
ing internal thin film resistors can be obtained.
■
Digital Communications
■
Spread Spectrum Communications
■
Spectral Analysis
■
Loran Receivers
■
Instrumentation
50k
10k
50k
10k
IN
1264 TA01
OUT
INV B
HPB/NB
BPB
LPB
SB
AGND
V
+
SA
LPA
BPA
HPA/NA
INV A
INV C
HPC/NC
BPC
LPC
SC
V
–
CLK
SD
LPD
BPD
HPD/ND
INV D
50k
50k
50k
10k
50k
10k
50k
50k
LTC1264
MAXIMUM
f
CENTER
160kHz
120kHz
60kHz
POWER
SUPPLY
±7.5V
±5V
Single 5V
0.1µF
f
CLK
0.1µF
Clock-Tunable 8th Order Bandpass Filter, f
CENTER
= f
CLK
/20
FREQUENCY (Hz)
10k
GAIN (dB)
10
0
–10
–20
–30
–40
–50
–60
–70
–80
100k 1M
1264 TA02
Gain vs Frequency
100kHz Bandpass, f
–3dB
Bandwidth = f
CENTER
/10
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
2
LTC1264
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A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
WU
U
PACKAGE
/
O
RDER I FOR ATIO
Total Supply Voltage (V
+
to V
–
) .............................. 16V
Input Voltage (Note 2) ........... (V
+
+ 0.3V) to (V
–
– 0.3V)
Output Short-Circuit Duration .......................... Indefinite
Power Dissipation............................................. 400mW
Burn-In Voltage ...................................................... 16V
Operating Temperature Range ............... –40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
LTC1264CN
LTC1264CSW
E
LECTR
IC
AL C CHARA TERIST
ICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Operating Supply Range ±2.375 ±8V
Voltage Swings V
S
= ±2.375V, R
L
= 5k ±1.5 V
V
S
= ±5V, R
L
= 5k ±3.2 ±3.7 V
● ±3.1 V
V
S
= ±7.5, R
L
= 5k ±6V
Output Short-Circuit Current (Source/Sink) 3mA
DC Open-Loop Gain 80 dB
GBW Product 7 MHz
Slew Rate 10 V/µs
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.(Internal Op Amps) T
A
= 25°C, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Center Frequency Range, f
O
(Note 2) V
S
= ±7.5V, T
A
< 85°C, Q < 2 0.1 - 250 kHz
V
S
= ±5V, T
A
< 85°C, Q < 2 0.1 - 200 kHz
V
S
= ±2.5V, T
A
< 85°C, Q < 2 0.1 - 100 kHz
Clock-to-Center Frequency Ratio, f
CLK
/f
O
20:1
Center Frequency Error (Note 4) V
S
= ±7.5V ±0.1 ± 0.7 %
● ±0.8 %
V
S
= ±5V ±0.2 ±0.8 %
● ±1.0 %
V
S
= ±2.375V – 1.6 %
Clock-to-Center Frequency Ratio, V
S
≥ ±5V 0.4 0.8 %
Side-to-Side Matching ● 1.0 %
Q Accuracy V
S
= ±5V – 2.7 %
● 7.0 %
f
O
Temperature Coefficient f
CLK
< 2MHz ±1 ppm/°C
Q Temperature Coefficient f
CLK
< 2MHz 5 ppm/°C
(Complete Filter) V
S
= ±5V, f
CLK
= 1MHz, all sides mode 1, f
O
= 50kHz, Q = 5, T
A
= 25°C, unless otherwise noted.
T
JMAX
= 110°C, θ
JA
= 65°C/W (N)
T
JMAX
= 110°C, θ
JA
= 85°C/W (S)
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
24
23
22
21
20
19
18
17
16
15
14
13
INV B
HPB/NB
BPB
LPB
SB
AGND
V
+
SA
LPA
BPA
HPA/NA
INV A
INV C
HPC/NC
BPC
LPC
SC
V
–
CLK
SD
LPD
BPD
HPD/ND
INV D
N PACKAGE
24-LEAD PLASTIC DIP
SW PACKAGE
24-LEAD PLASTIC SO (WIDE)
(Note 1)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
3
LTC1264
1264fb
E
LECTR
IC
AL C CHARA TERIST
ICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
DC Offset Voltage (Note 3) V
OS1
(DC Offset of Input Inverter) ● ±20 mV
V
OS2
(DC Offset of First Integrator) ● ±45 mV
V
OS3
(DC Offset of Second Integrator) ● ±45 mV
Clock Feedthrough V
S
= ±7.5V (f
CLK
is a Square Wave) 160 µV
RMS
V
S
= ±5V (f
CLK
is a Square Wave) 120 µV
RMS
V
S
= ±2.375V (f
CLK
is a Square Wave) 90 µV
RMS
Maximum Clock Frequency V
S
= ±7.5V, T
A
= 25°C 6 MHz
Power Supply Current V
S
= ±5V 9 14 23 mA
● 26 mA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Please refer to Typical Maximum Q vs Clock Frequency graphs.
Note 3: Calculations of output DC offsets of one 2nd order section. Also
see Block Diagram.
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
Typical Maximum Q
vs Clock Frequency
Typical Maximum Q
vs Clock Frequency
Typical Maximum Q
vs Clock Frequency
f
O
(measured) – f
O
(ideal)
f
O
(ideal)
V
OSN
V
OSBP
V
OSLP
MODE PINS 2, 11, 14, 23 PINS 3, 10, 15, 22 PINS 4, 9, 16, 21
1V
OS1
[(1Q) + 1 ||H
OLP
||] – V
OS3
/Q V
OS3
V
OSN
– V
OS2
1b V
OS1
[(1/Q) + 1 + R2/R1] – V
OS3
/Q V
OS3
≈(V
OSN
– V
OS2
)(1 + R5/R6)
2[V
OS1
(1 + R2/R1 + R2/R3 + R2/R4) – V
OS3
(R2/R3)] V
OS3
V
OSN
– V
OS2
• [R4/(R2 + R4)] + V
OS2
[R2/(R2 + R4)]
3V
OS2
V
OS3
V
OS1
[1 + R4/R1 + R4/R2 + R4/R3] – V
OS2
(R4/R2)
– V
OS3
(R4/R3)
Note 4: The center frequency f
O
, error is calculated as:
CLOCK FREQUENCY (MHz)
1.5
TYPICAL MAXIMUM Q
26
24
22
20
18
16
14
12
10
8
6
4
2
0
2.5
3.5
4.0
1264 G01
2.0
3.0
4.5
5.0
V
S
= ±7.5V
T
A
≤ 85°C
A
B
A. MODES 1, 1b
B. MODES 3, 3a
CLOCK FREQUENCY (MHz)
1.0
TYPICAL MAXIMUM Q
26
24
22
20
18
16
14
12
10
8
6
4
2
0
2.0
3.0
3.5
1264 G02
1.5
2.5
4.0
V
S
= ±5V
T
A
≤ 85°C
A
B
A. MODES 1, 1b
B. MODES 3, 3a
CLOCK FREQUENCY (MHz)
1.0
TYPICAL MAXIMUM Q
20
18
16
14
12
10
8
6
4
2
0
1.8
1264 G03
1.2
1.4
1.6
2.0
B
A
V
S
= SINGLE 5V
T
A
≤ 85°C
A. MODES 1, 1b
B. MODES 3, 3a
• 100
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Complete Filter) V
S
= ±5V, f
CLK
= 1MHz, all sides mode 1, f
O
= 50kHz,
Q = 5, unless otherwise noted.
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LTC1264CSW#PBF

Mfr. #:
Buy LTC1264CSW#PBF
Manufacturer:
Analog Devices Inc.
Description:
Active Filter Hi Speed, 4x Universal Filt Building Blo
Lifecycle:
New from this manufacturer.
Delivery:
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