TS4995EIJT STMicroelectronics, TS4995EIJT Datasheet - Page 17

• Manufacturer Part Number: TS4995EIJT
• Description: IC AMP AUDIO PWR 1.2W 9FLIPCHIP
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TS4995EIJT

• Output Type: 1-Channel (Mono)
• Max Output Power X Channels @ Load: 1.2W x 1 @ 8 Ohm
• Voltage - Supply: 2.5 V ~ 5.5 V
• Features: Depop, Differential Inputs, Standby, Thermal Protection
• Mounting Type: Surface Mount
• Package / Case: 9-FlipChip
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6101-2

TS4995
4
4.1
4.2
4.3
Note:
Application information
Differential configuration principle
The TS4995 is a monolithic full-differential input/ output power amplifier with fixed +6 dB
gain. The TS4995 also includes a common mode feedback loop that controls the output bias
value to average it at V
output voltage swing, and therefore, to maximize the output power. Moreover, as the load is
connected differentially instead of single-ended, output power is four times higher for the
same power supply voltage.
The advantages of a full-differential amplifier are:
●
●
●
●
●
In theory, the filtering of the internal bias by an external bypass capacitor is not necessary.
However, to reach maximum performance in all tolerance situations, it is recommended to
keep this option.
Common mode feedback loop limitations
As explained previously, the common mode feedback loop allows the output DC bias voltage
to be averaged at V
Due to the V
feedback loop can fulfil its role only within the defined range.
Low frequency response
The input coupling capacitors block the DC part of the input signal at the amplifier inputs. C
and R
The input impedance for the TS4995 is typically 20k
value.
From
V
High common mode noise rejection
Virtually no pop and click without additional circuitry, giving a faster start-up time
compared to conventional single-ended input amplifiers
Easier interfacing with differential output audio DAC
No input coupling capacitors required due to common mode feedback loop
Figure
in
ery high PSRR (power supply rejection ratio)
form a first-order high pass filter with -3 dB cut-off frequency.
IC
56, you can easily establish the C
limitation of the input stage (see
CC
/2 for any DC common mode bias input voltage.
CC
/2 for any DC common mode input voltage. This allows maximum
F
CL
=
2
×
π
×
R
1
in
in
×
Table 4 on page
value required for a -3 dB cut-off frequency.
C
in
Ω
(
Hz
and there is tolerance around this
)
5), the common mode
Application information
17/26
in