LTC1069-6CS8 Linear Technology, LTC1069-6CS8 Datasheet - Page 8

• Manufacturer Part Number: LTC1069-6CS8
• Description: IC FILTR 8TH ORDER LOWPASS 8SOIC
• Manufacturer: Linear Technology

Specifications of LTC1069-6CS8

• Filter Type: Elliptic, Lowpass Switched Capacitor
• Frequency - Cutoff Or Center: 14kHz/20kHz
• Number Of Filters: 1
• Max-order: 8th
• Voltage - Supply: 3 V ~ 10 V, ±1.5 V ~ 5 V
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LTC1069-6
APPLICATIONS INFORMATION
Wideband Noise
The wideband noise of the fi lter is the total RMS value
of the device’s noise spectral density and determines the
operating signal-to-noise ratio. The frequency contents
of the wideband noise lie within the fi lter’s passband. The
wideband noise cannot be reduced by adding post fi ltering.
The total wideband noise is nearly independent of the
clock frequency and depends slightly on the power supply
voltage (see Table 3). The clock feedthrough specifi cations
are not part of the wideband noise.
Table 3. Wideband Noise
8
3.3V
±5V
5V
V
S
WIDEBAND NOISE
118μV
123μV
127μV
RMS
RMS
RMS
Aliasing
Aliasing is an inherent phenomenon of sampled data
systems and occurs for input frequencies approaching
the sampling frequency. The internal sampling frequency
of the LTC1069-6 is 100 times its cutoff frequency. For
instance, if a 98.5kHz, 100mV
the input of an LTC1069-6 operating with a 50kHz clock,
a 1.5kHz, 484μV
output. Table 4 shows details.
Table 4. Aliasing (f
f
INPUT FREQUENCY
CLK
98.5 (or 101.5)
99.5 (or 100.5)
(V
/f
96 (or 104)
97 (or 103)
98 (or 102)
99 (or 101)
C
IN
= 50:1, f
(kHz)
= 1V
RMS
CUTOFF
)
CLK
RMS
= 1kHz
(Relative to Input)
= 50kHz)
OUTPUT LEVEL
alias signal will appear at the fi lter
– 80.6
–78.3
–70.4
–46.3
–1.38
–2.8
(dB)
RMS
signal is applied at
OUTPUT FREQUENCY
(Aliased Frequency)
(kHz)
4.0
3.0
2.0
1.5
1.0
0.5
10696fa