LTC1062CSW Linear Technology, LTC1062CSW Datasheet - Page 7

• Manufacturer Part Number: LTC1062CSW
• Description: IC FILTR 5TH ORDR LOWPASS 16SOIC
• Manufacturer: Linear Technology

Specifications of LTC1062CSW

• Filter Type: Butterworth, Lowpass Switched Capacitor
• Frequency - Cutoff Or Center: 20kHz
• Number Of Filters: 1
• Max-order: 5th
• Voltage - Supply: 5 V ~ 16 V, ±2.5 V ~ 8 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: LTC1062CS

APPLICATIO S I FOR ATIO
Divide By 1, 2, 4 (Pin 4)
By connecting Pin 4 to V
clock frequency driving the internal switched capacitor
network is the oscillator frequency divided by 1, 2, 4
respectively. Note that the f
respect to the internal clock generator output frequency.
The internal divider is useful for applications where octave
tuning is required. The ÷2 threshold is typically ±1V from
the mid supply voltage.
Transient Response
Figure 3 shows the LTC1062 response to a 1V input step.
U
+
U
, to mid supplies or to V
CLK
Table 2
/f
C
W
ratio of 100:1 is with
Figure 3. Step Response to a 1V Peak Input Step
DC – 0.25 • f
DC – 0.1 • f
DC – 0.5 • f
NOISE BW
DC – 1 • f
DC – 2 • f
U
C
C
C
C
C
200mV/VERT DIV
50ms/HORIZ DIV, f
5ms/HORIZ DIV, f
0.5ms/HORIZ DIV, f
2πRC
1
–
=
, the
1.62
f
C
C
C
= 100Hz
C
Filter Noise
The filter wideband RMS noise is typically 100µV
±5V supply and it is nearly independent from the value of
the cutoff frequency. For single 5V supply the RMS noise
is 80µV
the passband, that is from DC to f
density, unlike conventional active filters, is nearly zero for
frequencies below 0.1 • f
Performance Characteristics section. Table 2 shows the
LTC1062 RMS noise for different noise bandwidths.
= 10Hz
= 1kHz
RMS NOISE (V
RMS
100µV
20µV
62µV
2µV
8µV
. Sixty-two percent of the wideband noise is in
S
= ±5V)
2πRC
1
=
2.11
f
C
C
. This is shown in the Typical
C
. The noise spectral
LTC1062
2πRC
1
RMS
=
1062fd
1.94
7
for
f
C