DEMOTS4956J STMicroelectronics, DEMOTS4956J Datasheet - Page 38

• Manufacturer Part Number: DEMOTS4956J
• Description: BOARD DEMO TS4956EIJT/EIKJT
• Manufacturer: STMicroelectronics

Specifications of DEMOTS4956J

• Amplifier Type: Class AB
• Output Type: 1-Channel (Mono) with Mono and Stereo Headphones
• Max Output Power X Channels @ Load: 1W x 1 @ 8 Ohm; 43mW x 2 @ 32 Ohm
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Board Type: Fully Populated
• Utilized Ic / Part: TS4956
• Description/function: Audio Amplifiers
• Operating Supply Voltage: 2.7 V to 5.5 V
• Product: Audio Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: TS4956
• Other names: 497-6381; DEMOTS4956J

TS4956
4
4.1
4.1.1
4.1.2
4.1.3
Application information
The TS4956 integrates four monolithic power amplifiers and has one differential input and
two single-ended inputs. The output amplifiers can be configured in 7 different modes as
one SE (single-ended) capacitively-coupled output, two phantom ground headphone
outputs and two BTL outputs.
configuration schemes and
modes.
This chapter gives information on how to configure the TS4956 in an application.
Output configurations
Shutdown
When the device is in shutdown mode, all of the device’s outputs are in a high impedance
state.
Single-ended output configuration (modes 5 and 6)
When the device is woken-up via the I²C interface, output amplifier on output MLO is biased
to the V
output is needed to block the V
V
capacitor C
between any given mode to mode 5 or 6.
When the device is in mode 5 or 6 where the single-ended output MLO is active, all other
outputs are in a high impedance state.
Phantom ground output configuration (modes 3 and 4)
In a phantom ground output configuration (modes 3 and 4) the internal buffer is connected
to the PHG pin and biased to the V
also biased to the V
one to the PHG buffer. Therefore, no output capacitors are needed. The advantage of the
PHG output configuration is that there are fewer external components compared to an SE
configuration. However, note that in this configuration, the device has a higher power
dissipation (see
All other inactive outputs are in the high impedance state except for the MLO output, which
is biased to V
To achieve better crosstalk results in this case, each speaker should be connected with a
separate PHG wire (two speakers connected with four wires) as shown in
page 5
speakers connected with three wires).
CC
/2 voltage is present on this output in all modes (modes 1 to 7) to keep the output
(instead of using only one common PHG wire for both speakers, that is, two
CC
/2 voltage. In this configuration an output capacitor, C
out
CC
charged and to improve pop performance on this output during the switching
/2 voltage.
Section 4.3: Power dissipation and efficiency on page
CC
/2 voltage. One end of the load is connected to output amplifier and
Table 7 on page 8
Figure 1 on page 5
CC
/2 voltage and couples the audio signal to the load.
CC
/2 voltage. Output amplifiers (pins LHP and RHP) are
describes these configurations in different
and
Figure 2 on page 6
out
Application information
, on the single-ended
40).
show these
Figure 1 on
38/55