TS4604 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
TS4604
STMicroelectronics
'TS4604' PDF : 31 Pages View PDF
TS4604
Application information
To switch the TS4604 back to standby, the voltage across the divider R1, R2 has to be lower
than 1.25 V - VHyst × R1/(R1 + R2). The ESV can be an external voltage or simply the
power supply voltage PVcc_LD/HD.
6.9
2nd order Butterworth low-pass filter
The TS4604 can also be configured as a low-pass filter to be driven directly by a DAC
output. It can be used, for example, as a 2nd order low-pass filter, with either a differential
input or a single-ended input.
Figure 51 and Figure 52 depict these two kinds of application and represent a multiple
feedback 2nd order low-pass filter.
An AC-coupling capacitor should be added to block any DC component from the source,
which helps to reduce the output DC offset to a minimum.
Figure 51. Multi-feedback filter with
differential input
Figure 52. Multi-feedback filter with single-
ended input
Rfd
Cin
Rin
R1
C1
Vin-
C2
Vin+
C1
Cin
Rin
R1
Rfd
Cin
Rin
R1
Vout Vin-
C1
C2
Vout
Rfd
AM06145
AM06146
Example 2nd-order multi-feedback filter in differential mode
Figure 53 shows a filter in differential mode with a cut-off frequency at 30 kHz (configured as
per the values in Table 8, which proposes various filter options using a differential input).
Doc ID 17913 Rev 1
23/31
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