TS4909IQT STMicroelectronics, TS4909IQT Datasheet - Page 28

• 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
4.8
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Example calculation:
With R
with standard value which gives a lower cut-off frequency equal to 20.4Hz.
In this case,
This value is sufficient with regards to the previous formula, so we can state that the pop will
be imperceptible.
Connecting the headphones
Generally headphones are connected using a jack connector. To prevent pop in the
headphones while plugging in the jack, a pulldown resistor should be connected in parallel
with each headphone output. This allows the capacitors C
headphones are plugged in.
A resistor of 1 kΩ is high enough to be a negligible load, and low enough to charge the
capacitors C
Standby mode
When the TS4909 is in standby mode, the time required to put the output stages (V
V
circuitry in standby mode, is a few microseconds.
Figure 83. Internal equivalent circuit schematics of the TS4909 in standby mode
out2
and V
in
= 20kΩ and F
τ
in
out3
out
= R
) into a high impedance state with reference to ground, and the internal
in less than one second.
in
x C
BYPASS
Vin1
Vin2
in
CL
= 7.8ms
= 20Hz, -3db low cut-off frequency, C
25K
25K
1M
out
1M
to be charged even when no
in
= 398nF. So, C
Vout1
Vout3
Vout2
GND
in
= 390nF
out1
TS4909
,