LTC1565-31IS8 Linear Technology, LTC1565-31IS8 Datasheet - Page 8

• Manufacturer Part Number: LTC1565-31IS8
• Description: IC FILTR 7TH ORDER 650KHZ 8-SOIC
• Manufacturer: Linear Technology

Specifications of LTC1565-31IS8

• Filter Type: Linear Phase, Continuous-Time Lowpass
• Frequency - Cutoff Or Center: 650kHz
• Number Of Filters: 1
• Max-order: 7th
• Voltage - Supply: 4.75 V ~ 11 V, ±4.75 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIONS INFORMATION
LTC1565-31
Output Drive
Pin 7 and Pin 8 can drive a 1kΩ or 300pF load connected
to AC ground with a ± 0.5V signal (corresponding to a
2V
connected from Pin 7 to Pin 8) the outputs can produce a
2V
signal amplitudes the outputs can drive correspondingly
larger loads.
Noise
The wideband noise of the fi lter is the RMS value of the
device’s output noise spectral density. The wideband noise
data is used to determine the operating signal-to-noise at
a given distortion level. Most of the noise is concentrated
TYPICAL APPLICATIONS
8
P-P
P-P
V
IN
differential signal across 2kΩ or 150pF . For smaller
differential signal). For differential loads (loads
+
–
V
CM
4.99k
2.49k
4.99k
10μF
10μF
4.99k
2.49k
4.99k
2.49k
2
3
2
3
2
3
–
–
–
+
+
+
LT
LT1809
LT1809
®
A1
A2
A3
1809
5V
5V
5V
7
4
7
4
7
4
4.99k
2.49k
4.99k
6
6
6
0.1μF
0.1μF
0.1μF
Test Circuit for Single 5V Supply Operation
0.1μF
+V
–V
IN
IN
/2 + V
/2 + V
AMPLIFIERS A1, A2 AND A3 ALLOW THE USE OF A
GROUND-REFERENCED SINGLE-ENDED AC SOURCE AS THE
INPUT SIGNAL AND A SEPARATE GROUND-REFERENCED DC
SOURCE TO PROVIDE THE INPUT DC COMMON MODE VOLTAGE
AMPLIFIERS A4 AND A5 ALLOW MONITORING/MEASURING
THE DIFFERENTIAL OUTPUT WITH A SINGLE-ENDED,
GROUND-REFERENCED INSTRUMENT
CM
CM
V
1
2
3
4
+
/2
+IN
–IN
GND
V
–
LTC1565-31
in the fi lter passband and cannot be removed with post
fi ltering (Table 1). Table 2 lists the typical change in wide-
band noise with supply voltage.
Table 1. Wideband Noise vs Bandwidth, Single 5V Supply
Table 2. Wideband Noise vs Supply Voltage, f
BANDWIDTH
DC to f
DC to 2 • f
POWER SUPPLY
5V
± 5V
SHDN
+OUT
–OUT
V
+
CUTOFF
8
7
6
5
CUTOFF
1k
0.1μF
0.1μF
4.99k
2.49k
2.49k
5V
2
3
2
3
–
+
–
+
LT1809
LT1812
1k
TOTAL INTEGRATED NOISE
104μV
118μV
TOTAL INTEGRATED NOISE
DC TO 2 • f
118μV
120μV
A4
A5
5V
5V
7
4
7
4
RMS
RMS
RMS
RMS
4.99k
0.01μF
6
6
CUTOFF
0.1μF
0.1μF
CUTOFF
1565-31 TA08
19k
20Ω
= 650kHz
V
(SINGLE ENDED)
OUT
2.2μF
156531fa