TS486IST STMicroelectronics, TS486IST Datasheet - Page 28

• Manufacturer Part Number: TS486IST
• Description: IC AMP AUDIO PWR .108W AB 8MSOP
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TS486IST

• Output Type: Headphones, 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 108mW x 2 @ 16 Ohm
• Voltage - Supply: 2 V ~ 5.5 V
• Features: Depop, Short-Circuit Protection, Standby
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Operational Class: Class-AB
• Audio Amplifier Output Configuration: 2-Channel Stereo
• Output Power (typ): 0.108x2@16OhmW
• Audio Amplifier Function: Headphone
• Input Offset Voltage: 1(Typ)@5VmV
• Input Bias Current: 200nA
• Total Harmonic Distortion: 0.3@16Ohm@90mW%
• Single Supply Voltage (typ): 3/5V
• Dual Supply Voltage (typ): Not RequiredV
• Supply Current (max): 2.5@5VmA
• Power Supply Requirement: Single
• Power Dissipation: 580mW
• Unity Gain Bandwidth Product (typ): 1.1MHz
• Rail/rail I/o Type: No
• Power Supply Rejection Ratio: 58dB
• Single Supply Voltage (min): 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: 8
• Package Type: Mini SO
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8112-2; TS486IST

TS486-TS487
and for various values of the input resistor R
The input resistance of the fixed gain version is
typically 20k .
The following curve shows the limits of the roll off
frequency depending on the min. and max. values
of Rin:
LOW FREQUENCY ROLL OFF WITH OUTPUT
CAPACITORS
The DC voltage on the outputs of the TS486/487
is blocked by the output capacitors C
C
the resistance of the load R
order high pass filter.
Assuming that F
amplified (with a 3dB attenuation), the minimum
value of C
C
The following curve gives directly the low roll-off
28/31
OUT2
OUT
1000
100
> 1 / (2* *F
10
. Each output capacitor C
1
0.01
Rin = 100k
OUT
is:
Rin = 20k
fixed gain versions
min
min
0.1
is the lowest frequency to be
Rin = 10k
*R
and
L
Cin (µF)
)
L
is equivalent to a first
1
OUT
in series with
Rin = 1k
OUT1
10
IN
and
.
frequency versus the output capacitor C
and for the two typical 16 and 32 impedances:
DECOUPLING CAPACITOR C
The internal bias voltage at Vcc/2 is decoupled
with the external capacitor C
The TS486 and TS487 have a specified Power
Supply Rejection Ratio parameter with C
A higher value of C
example, a 4.7µF improves the PSRR by 15dB at
200Hz (please, refer to fig. 76 "PSRR vs Bypass
Capacitor").
POP PRECAUTIONS
Generally headphones are connected using a
connector as a jack. To prevent a pop in the
headphones when plugged in the jack, a resistor
should be connected in parallel with each
headphone output. This allows the capacitors
Cout to be charged even when no headphone is
plugged.
A resistor of 1 k is high enough to be a negligible
load, and low enough to charge the capacitors
Cout in less than one second.
1000
100
10
1
10
RL = 32
100
B
C
improves the PSRR, for
OUT
( F)
B
.
1000
B
RL = 16
OUT
B
10000
= 1µF.
in µF