TS4909IQT STMicroelectronics, TS4909IQT Datasheet - Page 22

• Manufacturer Part Number: TS4909IQT
• Description: IC AMP AUDIO .158W STER AB 10DFN
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TS4909IQT

• Output Type: Headphones, 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 158mW x 2 @ 16 Ohm
• Voltage - Supply: 2.2 V ~ 5.5 V
• Features: Depop, Standby
• Mounting Type: Surface Mount
• Package / Case: 10-DFN
• Operational Class: Class-AB
• Audio Amplifier Output Configuration: 2-Channel Stereo
• Audio Amplifier Function: Headphone
• Total Harmonic Distortion: 0.3@16Ohm@90mW%
• Single Supply Voltage (typ): 3/5V
• Dual Supply Voltage (typ): Not RequiredV
• Supply Current (max): 4.8@5VmA
• Power Supply Requirement: Single
• Power Dissipation: 1.79W
• Rail/rail I/o Type: No
• Power Supply Rejection Ratio: 72dB
• Single Supply Voltage (min): 2.2V
• Single Supply Voltage (max): 5.5V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 10
• Package Type: DFN
• For Use With: 497-6380 - BOARD DEMO FOR TS4909Q
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5992-2

Application information
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4.1
4.2
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Application information
General description
The TS4909 integrates two monolithic power amplifiers. The amplifier output can be
configured to provide either single-ended (SE) capacitively-coupled output or phantom
ground (PHG) capacitor-less output.
shows schematics for each of these configurations.
Single-ended configuration
In the single-ended configuration, an output coupling capacitor, C
power amplifier (V
a DC voltage equal to V
Phantom ground configuration
In the phantom ground configuration, an internal buffer (V
and the output of the power amplifiers are also biased to the V
output coupling capacitors are needed. This is of primary importance in portable
applications where space constraints are continually present.
Frequency response
Higher cut-off frequency
In the high frequency region, you can limit the bandwidth by adding a capacitor C
parallel with R
that F
value of C
Figure 77. Higher cut-off frequency vs. feedback capacitor
CH
is the highest frequency to be amplified (with a 3dB attenuation), the maximum
feed
is:
feed
. It forms a low-pass filter with a -3dB cut-off frequency F
out1
and V
CC
100k
100
10k
1k
/2 and the output coupling capacitor blocks this reference voltage.
0.01
out2
) is mandatory. The output of the power amplifier is biased to
Rfeed=40k
F
CH
Figure 1: Typical applications for the TS4909 on page 3
0.1
=
Rfeed=80k
Ω
--------------------------------------------------
2π
⋅
R
Cfeed
Ω
feed
1
1
⋅
(
μ
F
C
)
Rfeed=10k
feed
out3
Rfeed=20k
10
) maintains the V
Ω
CC
/2 voltage. Therefore, no
out
Ω
, on the output of the
100
CH
. Assuming
CC
/2 voltage
feed
TS4909
in