TS4604 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
TS4604
STMicroelectronics
'TS4604' PDF : 31 Pages View PDF
TS4604
Application information
These capacitors must be placed as close as possible to the TS4604 to minimize parasitic
inductance and resistance that have a negative impact on the audio performance.
6.5
Input coupling capacitor (Cin)
An input coupling capacitor (Cin) might be used for TS4604 operation to block any DC
component of the audio signal.
Cin starts to have an effect in the low frequency region. Cin forms with Rin a high-pass filter
with a -3 dB cut-off frequency.
Fc(–3dB) = 2----.--π----⋅------R----1-i--n----⋅------C-----i--n- (Hz)
Example
A differential input gain as shown in Figure 46 on page 20 with the gain equalling 0 dB
(Rin = 10 kΩ, Rfd = 10 kΩ) and an input capacitor of 2.2 µF gives:
Fc = -------------------------------1-------------------------------- = 7.2Hz
2.π ⋅ 10000 ⋅ 2.2e10–6
The high-pass filter has a -3 dB cut-off frequency at 7.2 Hz in this case.
6.6
Range of the gain setting resistors
The TS4604 can be use in different configurations, as shown in figures 46, 47 and 48.
The gain is given by the external resistors Rfd divided by Rin. The feedback resistor Rfd
does not exceed 100 kΩ for closed-loop stability reasons.
Table 7 gives the recommended resistor values and the gain for different types of
application.
Table 7. Recommended resistors values
Rin
Rfd
Differential gain
10 kΩ
10 kΩ
10 kΩ
4.7 kΩ
10 kΩ
20 kΩ
50 kΩ
47 kΩ
0 dB
6 dB
14 dB
20 dB
10 kΩ
100 kΩ
20 dB
Inverting gain
0 dB
6 dB
14 dB
20 dB
20 dB
Non-inverting gain
6 dB
10 dB
16 dB
21 dB
21 dB
Doc ID 17913 Rev 1
19/31
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