LTC1565-31 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC1565-31 Datasheet PDF : 12 Pages
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LTC1565-31
APPLICATIONS INFORMATION
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
2VP-P differential signal). For differential loads (loads
connected from Pin 7 to Pin 8) the outputs can produce a
2VP-P differential signal across 2kΩ or 150pF. For smaller
signal amplitudes the outputs can drive correspondingly
larger loads.
Noise
The wideband noise of the filter 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
in the filter passband and cannot be removed with post
filtering (Table 1). Table 2 lists the typical change in wide-
band noise with supply voltage.
Table 1. Wideband Noise vs Bandwidth, Single 5V Supply
BANDWIDTH
TOTAL INTEGRATED NOISE
DC to fCUTOFF
DC to 2 • fCUTOFF
104μVRMS
118μVRMS
Table 2. Wideband Noise vs Supply Voltage, fCUTOFF = 650kHz
POWER SUPPLY
TOTAL INTEGRATED NOISE
DC TO 2 • fCUTOFF
5V
118μVRMS
± 5V
120μVRMS
TYPICAL APPLICATIONS
Test Circuit for Single 5V Supply Operation
4.99k
5V
4.99k
2.49k
10μF
2– 7
A1
3 +LT®1809
4
0.1μF
6
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
2.49k
5V
VIN
4.99k
VCM 2.49k
+–
4.99k 10μF
2– 7
A2
3 +LT1809
4
0.1μF
6
4.99k
5V
+VIN/2 + VCM 1
+IN
8
+OUT
–VIN/2 + VCM 2
–IN
7
–OUT
LTC1565-31
3
GND
V+ 6
0.1μF
4 V–
5
SHDN
4.99k 2 –
7
0.1μF
A3
6
V+/2
2.49k 3 +LT1809
4
8
4.99k
5V
4.99k
2.49k
2.49k
5V
0.1μF
2– 7
A4
3 +LT1809
4
1k
5V
1k
0.1μF
2– 7
A5
3 +LT1812
4
0.1μF
6
VOUT
(SINGLE ENDED)
0.01μF 19k
0.1μF
6
20Ω
1565-31 TA08
2.2μF
156531fa
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