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LTC1569CS8-7#TRPBF

P1-P3P4-P6P7-P9P10-P12
1
LTC1569-7
TYPICAL APPLICATION
U
DESCRIPTIO
U
APPLICATIO S
U
FEATURES
■
One External R Sets Cutoff Frequency
■
Root Raised Cosine Response
■
Up to 300kHz Cutoff on a Single 5V Supply
■
Up to 150kHz Cutoff on a Single 3V Supply
■
10th Order, Linear Phase Filter in an SO-8
■
DC Accurate, V
OS(MAX)
= 5mV
■
Low Power Modes
■
Differential or Single-Ended Inputs
■
80dB CMRR (DC)
■
80dB Signal-to-Noise Ratio, V
S
= 5V
■
Operates from 3V to ±5V Supplies
The LTC
®
1569-7 is a 10th order lowpass filter featuring
linear phase and a root raised cosine amplitude response.
The high selectivity of the LTC1569-7 combined with its
linear phase in the passband makes it suitable for filtering
both in data communications and data acquisition sytems.
■
Data Communication Filters for 3V Operation
■
Linear Phase and Phase Matched Filters for I/Q
Signal Processing
■
Pin Programmable Cutoff Frequency Lowpass Filters
Furthermore, its root raised cosine response offers the
optimum pulse shaping for PAM data communications
.
The filter attenuation is 57dB at 1.5 • f
CUTOFF
, 60dB at 2 •
f
CUTOFF
, and in excess of 80dB at 6 • f
CUTOFF
. DC-accuracy-
sensitive applications benefit from the 5mV maximum DC
offset.
The LTC1569-7 is the first sampled data filter which does
not require an external clock yet its cutoff frequency can be
set with a single external resistor with a typical accuracy
of 3.5% or better
. The external resistor programs an
internal oscillator whose frequency is divided by either 1,
4 or 16 prior to being applied to the filter network. Pin 5
determines the divider setting. Thus, up to three cutoff
frequencies can be obtained for each external resistor
value. Using various resistor values and divider settings,
the cutoff frequency can be programmed over a range of
seven octaves. Alternatively, the cutoff frequency can be
set with an external clock and the clock-to-cutoff fre-
quency ratio is 32:1. The ratio of the internal sampling rate
to the filter cutoff frequency is 64:1.
The LTC1569-7 is fully tested for a cutoff frequency of
256kHz/128kHz with single 5V/3V supply although up to
300kHz cutoff frequencies can be obtained.
The LTC1569-7 features power savings modes and it is
available in an SO-8 surface mount package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Frequency Response, f
CUTOFF
= 128kHz/32kHz/8kHz
Single 3V Supply, 128kHz/32kHz/8kHz Lowpass Filter
Linear Phase, DC Accurate,
Tunable, 10th Order Lowpass Filter
FREQUENCY (kHz)
1
GAIN (dB)
0
–20
–40
–60
–80
–100
10 100 1000
1569-7 TA01a
18
27
36
45
1µF
3V
1/4
1/16
1/1
3V
R
EXT
= 10k
100pF
1µF
2k
3.48k
3V
LTC1569-7
EASY TO SET f
CUTOFF
:
f
CUTOFF
=
128kHz (10k/R
EXT
)
1, 4 OR 16
1569-7 TA01
IN
+
IN
–
GND
V
–
OUTV
IN
V
OUT
V
+
R
X
DIV/CLK
2
LTC1569-7
PARAMETER CONDITIONS MIN TYP MAX UNITS
Filter Gain V
S
= 5V, f
CLK
= 8.192MHz, f
IN
= 5120Hz = 0.02 • f
CUTOFF
● –0.10 0.00 0.10 dB
f
CUTOFF
= 256kHz, V
IN
= 2.5V
P-P
,f
IN
= 51.2kHz = 0.2 • f
CUTOFF
● –0.25 –0.15 –0.05 dB
R
EXT
= 5k, Pin 5 Shorted to Pin 4 f
IN
= 128kHz = 0.5 • f
CUTOFF
● –0.50 –0.41 –0.25 dB
f
IN
= 204.8kHz = 0.8 • f
CUTOFF
● –1.1 –0.65 –0.40 dB
f
IN
= 256kHz = f
CUTOFF
, LTC1569C ● –5.7 –3.8 –2.3 dB
f
IN
= 256kHz = f
CUTOFF
, LTC1569I ● –6.2 –3.8 –2.0 dB
f
IN
= 384kHz = 1.5 • f
CUTOFF
● –58 –48 dB
f
IN
= 512kHz = 2 • f
CUTOFF
● –62 –54 dB
f
IN
= 768kHz = 3 • f
CUTOFF
● –67 –64 dB
V
S
= 2.7V, f
CLK
= 1MHz, f
IN
= 625Hz = 0.02 • f
CUTOFF
● –0.08 0.00 0.12 dB
f
CUTOFF
= 31.25kHz, V
IN
= 1V
P-P
,f
IN
= 6.25kHz = 0.2 • f
CUTOFF
● –0.25 –0.15 –0.05 dB
Pin 6 Shorted to Pin 4, External Clock f
IN
= 15.625kHz = 0.5 • f
CUTOFF
● –0.50 –0.40 –0.30 dB
f
IN
= 25kHz = 0.8 • f
CUTOFF
● –0.75 –0.65 –0.50 dB
f
IN
= 31.25kHz = f
CUTOFF
● –3.3 –3.15 –3.0 dB
f
IN
= 46.875kHz = 1.5 • f
CUTOFF
● –57 –52 dB
f
IN
= 62.5kHz = 2 • f
CUTOFF
● –60 –54 dB
f
IN
= 93.75kHz = 3 • f
CUTOFF
● –66 –58 dB
Filter Phase V
S
= 2.7V, f
CLK
= 4MHz, f
IN
= 2500Hz = 0.02 • f
CUTOFF
–11 Deg
f
CUTOFF
= 125kHz, Pin 6 Shorted to f
IN
= 25kHz = 0.2 • f
CUTOFF
● –114 –112 –110 Deg
Pin 4, External Clock f
IN
= 62.5kHz = 0.5 • f
CUTOFF
● 78 80 82 Deg
f
IN
= 100kHz = 0.8 • f
CUTOFF
● –85 –83 –81 Deg
f
IN
= 125kHz = f
CUTOFF
● 155 158 161 Deg
f
IN
= 187.5kHz = 1.5 • f
CUTOFF
–95 Deg
Filter Cutoff Accuracy R
EXT
= 10.24k from Pin 6 to Pin 7, 125kHz ±1%
when Self-Clocked V
S
= 3V, Pin 5 Shorted to Pin 4
Filter Output DC Swing V
S
= 3V, Pin 3 = 1.11V 2.1 V
P-P
● 1.9 V
P-P
V
S
= 5V, Pin 3 = 2V 3.9 V
P-P
● 3.7 V
P-P
V
S
= ±5V 8.6 V
P-P
LTC1569C ● 8.4 V
P-P
LTC1569I ● 8.0 V
P-P
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
ORDER PART
NUMBER
WU
U
PACKAGE
/
O
RDER I FOR ATIO
(Note 1)
Total Supply Voltage................................................ 11V
Power Dissipation.............................................. 500mW
Operating Temperature
LTC1569C ............................................... 0°C to 70°C
LTC1569I............................................ –40°C to 85°C
Storage Temperature ............................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
S
= 3V (V
+
= 3V, V
–
= 0V), f
CUTOFF
= 128kHz, R
LOAD
= 10k unless otherwise specified.
E
LECTR
IC
AL C CHARA TERIST
ICS
LTC1569CS8-7
LTC1569IS8-7
S8 PART
MARKING
Consult factory for Military grade parts.
T
JMAX
= 125°C, θ
JA
= 80°C/W (Note 6)
15697
1569I7
1
2
3
4
8
7
6
5
TOP VIEW
OUT
V
+
R
X
DIV/CLK
IN
+
IN
–
GND
V
–
S8 PACKAGE
8-LEAD PLASTIC SO
3
LTC1569-7
Output DC Offset R
EXT
= 10k, Pin 5 Shorted to Pin 4 V
S
= 3V ±2 ±5mV
(Note 2) V
S
= 5V ±6 ±12 mV
V
S
= ±5V ±15 mV
Output DC Offset Drift R
EXT
= 10k, Pin 5 Shorted to Pin 4 V
S
= 3V –25 µV/°C
V
S
= 5V –25 µV/°C
V
S
= ±5V ±25 µV/°C
Clock Pin Logic Thresholds V
S
= 3V Min Logical “1” 2.6 V
when Clocked Externally Max Logical “0” 0.5 V
V
S
= 5V Min Logical “1” 4.0 V
Max Logical “0” 0.5 V
V
S
= ±5V Min Logical “1” 4.0 V
Max Logical “0” 0.5 V
Power Supply Current f
CLK
= 1.028MHz (10k from Pin 6 to Pin 7, V
S
= 3V 6 8 mA
(Note 3) Pin 5 Open, ÷ 4), f
CUTOFF
= 32kHz ● 9mA
V
S
= 5V 7 9 mA
● 10 mA
V
S
= 10V 9 13 mA
● 14 mA
f
CLK
= 4.096MHz (10k from Pin 6 to Pin 7, V
S
= 3V 9.5 mA
Pin 5 Shorted to Pin 4, ÷ 1), f
CUTOFF
= 128kHz ● 14 mA
f
CLK
= 8.192MHz (5k from Pin 6 to Pin 7, V
S
= 5V 20 mA
Pin 5 Shorted to Pin 4, ÷ 1), f
CUTOFF
= 256kHz ● 30 mA
V
S
= 10V 27 mA
● 37 mA
Power Supply Voltage where Pin 5 Shorted to Pin 4, Note 3 ● 3.7 4.2 4.6 V
Low Power Mode is Enabled
Clock Feedthrough R
EXT
= 10k, Pin 5 Open 0.4 mV
RMS
Wideband Noise Noise BW = DC to 2 • f
CUTOFF
125 µV
RMS
THD f
IN
= 10kHz, 1.5V
P-P
74 dB
Clock-to-Cutoff 32
Frequency Ratio
Max Clock Frequency V
S
= 3V 5 MHz
(Note 4) V
S
= 5V 9.6 MHz
V
S
= ±5V 13 MHz
Min Clock Frequency 3V to ±5V, T
A
< 85°C3kHz
(Note 5)
Input Frequency Range Aliased Components <–65dB 0.9 • f
CLK
Hz
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
S
= 3V (V
+
= 3V, V
–
= 0V), f
CLK
= 4.096MHz, f
CUTOFF
= 128kHz, R
LOAD
= 10k unless otherwise specified.
E
LECTR
IC
AL C CHARA TERIST
ICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Note 1: Absolute maximum ratings are those values beyond which the life
of a device may be impaired.
Note 2: DC offset is measured with respect to Pin 3.
Note 3: There are several operating modes which reduce the supply
current. For V
S
< 4V, relative to divide-by-1 mode, the current is typically
reduced by 50% relative to V
S
= 5V. If the internal oscillator is used as the
clock source and the divide-by-4 or divide-by-16 mode is enabled, the
supply current is typically reduced by 60%,relative to divide-by-1 mode,
independent of the value of V
S
.
Note 4: The maximum clock frequency is arbitrarily defined as the
frequency at which the filter AC response exhibits >1dB of gain peaking.
Note 5: The minimum clock frequency is arbitrarily defined as the frequecy
at which the filter DC offset changes by more than 5mV.
Note 6: Thermal resistance varies depending upon the amount of PC board
metal attached to the device. θ
JA
is specified for a 2500mm
2
test board
covered with 2oz copper on both sides.
P1-P3P4-P6P7-P9P10-P12

LTC1569CS8-7#TRPBF

Mfr. #:
Buy LTC1569CS8-7#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Active Filter 10th Order Linear Phase L/Pass Filter
Lifecycle:
New from this manufacturer.
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