featuring clock-tunable cutoff frequency and 2.5mA power
supply current with a single 5V supply. An additional feature
of the LTC1069-1 is operation with a single 3.3V supply.
The cutoff frequency (f
CUTOFF
) of the LTC1069-1 is equal
to the clock frequency divided by 100. The gain at f
CUTOFF
is –0.7dB and the typical passband ripple is ±0.15dB up
to 0.9f
CUTOFF
. The stopband attenuation of the LTC1069-1
features a progressive elliptic response reaching 20dB
attenuation at 1.2f
CUTOFF
, 52dB attenuation at 1.4f
CUTOFF
and 70dB attenuation at 2f
CUTOFF
.
With ±5V supplies, the LTC1069-1 cutoff frequency can
be clock-tuned up to 12kHz; with a single 5V supply, the
maximum cutoff frequency is 8kHz.
The low power feature of the LTC1069-1 does not penal-
ize the device’s dynamic range. With ±5V supplies and an
input range of 0.3V
RMS
to 2.5V
RMS
, the signal-to-(noise +
THD) ratio is ≥70dB. The wideband noise of the LTC1069-1
is 110μV
RMS
.
Other filter responses with lower power or
higher speed can be obtained. Please contact LTC market-
ing for details.
The LTC1069-1 is available in 8-pin PDIP and 8-pin SO
packages.
8th Order Elliptic Filter in SO-8 Package
Operates from Single 3.3V to ±5V Power Supplies
–20dB at 1.2f
CUTOFF
–52dB at 1.4f
CUTOFF
–70dB at 2f
CUTOFF
Wide Dynamic Range
110μV
RMS
Wideband Noise
3.8mA Supply Current with ±5V Supplies
2.5mA Supply Current with Single 5V Supply
2mA Supply Current with Single 3.3V Supply
APPLICATIONS
n
n
Telecommunication Filters
Antialiasing Filters
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
Frequency Response
10
Single 3.3V Supply 3kHz Elliptic Lowpass Filter
+
0.47μF
3.3V
0.1μF
AGND
V
+
0
–10
V
OUT
V
–
V
OUT
GAIN (dB)
f
CLK
300kHz
1069-1 TA01
–20
–30
–40
–50
–60
–70
–80
1.5
3
6
4.5
FREQUENCY (kHz)
7.5
10691 TA02
LTC1069-1
NC
NC
V
IN
V
IN
CLK
10691fa
1
LTC1069-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage (V
+
to V
–
) .................................12V
Maximum Voltage at
Any Pin .............................(V
–
– 0.3V) ≤ V ≤ (V+ + 0.3V)
Operating Temperature Range
LTC1069C-1 ............................................. 0°C to 70°C
LTC1069I-1 .......................................... –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
TOP VIEW
AGND 1
V
+
2
NC 3
V
IN
4
8
7
6
5
V
OUT
V
–
NC
CLK
AGND 1
V
+
2
NC 3
V
IN
4
TOP VIEW
8
7
6
5
V
OUT
V
–
NC
CLK
N8 PACKAGE
8-LEAD PLASTIC DIP
T
JMAX
= 110°C,
θ
JA
= 100°C/W
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 125°C,
θ
JA
= 130°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC1069-1CN8#PBF
LTC1069-1IN8#PBF
LTC1069-1CS8#PBF
LTC1069-1IS8#PBF
LTC1069-1CS8#TRPBF
LTC1069-1IS8#TRPBF
TAPE AND REEL
PART MARKING*
LTC1069-1
LTC1069-1
10691
10691I
PACKAGE DESCRIPTION
8-Lead Plastic DIP
8-Lead Plastic DIP
8-Lead Plastic SO
8-Lead Plastic SO
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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
PARAMETER
Passband Gain (f
IN
≤ 0.25f
CUTOFF
)
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. f
CUTOFF
is the filter’s cutoff frequency and is equal to f
CLK
/100. The
f
CLK
signal level is TTL or CMOS (clock rise or fall time ≤ 1μs), V
S
= 3.3V to ±5V, R
L
= 10k, unless otherwise noted. All AC gains are
measured relative to the passband gain.
CONDITIONS
V
S
= ±5V, f
CLK
= 500kHz
f
TEST
= 1.25kHz, V
IN
= 1V
RMS
V
S
= 3.3V, f
CLK
= 200kHz
f
TEST
= 0.5kHz, V
IN
= 0.5V
RMS
l
l
MIN
–0.30
–0.35
–0.30
–0.35
TYP
0.2
0.2
MAX
0.70
0.75
0.70
0.75
UNITS
dB
dB
dB
dB
10691fa
2
LTC1069-1
ELECTRICAL CHARACTERISTICS
PARAMETER
Gain at 0.50f
CUTOFF
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. f
CUTOFF
is the filter’s cutoff frequency and is equal to f
CLK
/100. The
f
CLK
signal level is TTL or CMOS (clock rise or fall time ≤ 1μs), V
S
= 3.3V to ±5V, R
L
= 10k, unless otherwise noted. All AC gains are
measured relative to the passband gain.
CONDITIONS
V
S
= ±5V, f
CLK
= 500kHz
f
TEST
= 2.5kHz, V
IN
= 1V
RMS
V
S
= 3.3V, f
CLK
= 200kHz
f
TEST
= 1kHz, V
IN
= 0.5V
RMS
Gain at 0.75f
CUTOFF
V
S
= ±5V, f
CLK
= 500kHz
f
TEST
= 3.75kHz, V
IN
= 1V
RMS
V
S
= 3.3V, f
CLK
= 200kHz
f
TEST
= 1.5kHz, V
IN
= 0.5V
RMS
Gain at 0.90f
CUTOFF
V
S
= ±5V, f
CLK
= 500kHz
f
TEST
= 4.5kHz, V
IN
= 1V
RMS
V
S
= 3.3V, f
CLK
= 200kHz
f
TEST
= 1.8kHz, V
IN
= 0.5V
RMS
Gain at 0.95f
CUTOFF
V
S
= ±5V, f
CLK
= 500kHz
f
TEST
= 4.75kHz, V
IN
= 1V
RMS
V
S
= 3.3V, f
CLK
= 200kHz
f
TEST
= 1.9kHz, V
IN
= 0.5V
RMS
Gain at f
CUTOFF
V
S
= ±5V, f
CLK
= 500kHz
f
TEST
= 5.0kHz, V
IN
= 1V
RMS
V
S
= 3.3V, f
CLK
= 200kHz
f
TEST
= 2.0kHz, V
IN
= 0.5V
RMS
Gain at 1.25f
CUTOFF
V
S
= ±5V, f
CLK
= 500kHz
f
TEST
= 6.25kHz, V
IN
= 1V
RMS
V
S
= 3.3V, f
CLK
= 200kHz
f
TEST
= 2.5kHz, V
IN
= 0.5V
RMS
Gain at 1.50f
CUTOFF
V
S
= ±5V, f
CLK
= 500kHz
f
TEST
= 7.5kHz, V
IN
= 1V
RMS
V
S
= 3.3V, f
CLK
= 200kHz
f
TEST
= 3kHz, V
IN
= 0.5V
RMS
Output DC Offset (Input at AGND)
V
S
= ±5V, f
CLK
= 500kHz
V
S
= 4.75V, f
CLK
= 400kHz
V
S
= 3.3V, f
CLK
= 200kHz
V
S
= ±5V
V
S
= 4.75V
V
S
= 3.3V
V
S
= ±5V, f
CLK
= 500kHz
V
S
= 4.75V, f
CLK
= 400kHz
V
S
= 3.3V, f
CLK
= 200kHz
V
S
= ±5V
V
S
= 4.75V
V
S
= 3.3V
0
30
±1.57
43
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
–0.10
–0.11
–0.10
–0.11
–0.20
–0.25
–0.20
–0.25
–0.20
–0.25
–0.20
–0.25
–0.30
–0.35
–0.30
–0.35
–1.25
–1.35
–1.25
–1.35
–30
–31
–30
–31
–58
–59
–58
–59
TYP
–0.03
–0.03
0.04
0.04
–0.01
–0.01
–0.05
–0.04
–0.70
–0.61
–27
–27
–53
–53
30
20
15
MAX
0.10
0.11
0.10
0.11
0.20
0.25
0.20
0.25
0.20
0.25
0.20
0.25
0.30
0.35
0.30
0.35
–0.25
–0.15
–0.25
–0.15
–25
–24
–25
–24
–50
–49
–50
–49
150
100
3.25
1.25
0.60
5.5
4.5
3.5
UNITS
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
mV
mV
mV
V
V
V
mA
mA
mA
MHz
MHz
MHz
Output Voltage Swing
–3.25
–1.50
–0.70
±4.0
±1.7
±0.9
3.8
2.5
2.0
1.2
0.8
0.5
Power Supply Current
Maximum Clock Frequency
Input Frequency Range
Input Resistance
Operating Power Supply Voltage
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
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