TS489IQT STMicroelectronics, TS489IQT Datasheet - Page 24

• Manufacturer Part Number: TS489IQT
• Description: IC AMP AUDIO PWR .13W STER 8DFN
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TS489IQT

• Output Type: Headphones, 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 130mW x 2 @ 16 Ohm
• Voltage - Supply: 2.2 V ~ 5.5 V
• Features: Depop, Short-Circuit Protection, Standby
• Mounting Type: Surface Mount
• Package / Case: 8-DFN
• For Use With: 497-6363 - BOARD DEMO FOR TS489
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5991-2

Application information
4.4
24/32
Note:
Higher cut-off frequency
In the high frequency region, you can limit the bandwidth by adding a capacitor C
parallel with R
that F
C
Figure 79. Lower cut-off frequency vs.
Figure 81. Higher cut-off frequency vs. feedback capacitor
feed
100
10k
1k
10
CH
is:
1
is highest frequency to be amplified (with a 3dB attenuation), the maximum value of
In case F
1st order high-pass filter on the input and the 1st order high-pass filter on the
output create a 2nd order high-pass filter in the audio signal path with an
attenuation 6dB on F
input capacitor
feed
. It forms a low-pass filter with a -3dB cut-off frequency F
10
CL
Rin=10k
is kept the same for calculation, It must be taken in account that the
Cin (nF)
Ω
100k
Rin=20k
10k
100
1k
0.01
100
CL
Rin=50k
Ω
Rfeed=40k
F
and a roll-off 40db
CH
Rin=100k
Ω
=
0.1
Rfeed=80k
Ω
--------------------------------------------------
2π
Ω
1000
⋅
R
Cfeed
Ω
Figure 80. Lower cut-off frequency vs.
feed
1
1
100
10k
1k
10
(
μ
⋅
0.1
F
⁄
)
Rfeed=10k
C
decade.
feed
Rfeed=20k
10
output capacitor
Ω
1
Ω
100
Cout (
10
R
L
μ
=16
F)
CH
Ω
R
L
=32
. Assuming
TS488-TS489
Ω
100
feed
R
L
=600
in
Ω
1000