TS4975EIJT STMicroelectronics, TS4975EIJT Datasheet - Page 25

• Manufacturer Part Number: TS4975EIJT
• Description: IC AMP AUDIO .04W AB 12FLIPCHIP
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TS4975EIJT

• Output Type: Headphones, 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 40mW x 2 @ 16 Ohm
• Voltage - Supply: 2.5 V ~ 5.5 V
• Features: Depop, I²C, Standby, Thermal Protection, Volume Control
• Mounting Type: Surface Mount
• Package / Case: 12-FlipChip
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5199-2; TS4975EIJT

TS4975
4.1.3
4.2
4.2.1
4.2.2
4.2.3
Table 14.
Acknowledge
The number of data bytes transferred between the start and the stop conditions from the CPU
master to the TS4975 slave is not limited. Each byte of eight bits is followed by one
acknowledge bit.
The TS4975 which is addressed, generates an acknowledge after the reception of each byte
that has been clocked out.
Output configuration
When the device is switched to Mode 5,6,7 or 8, where one channel is in shutdown, it means
that corresponding output is in a high impedance state.
Single-ended configuration
When the device is woken-up or switched via I²C interface to SE configuration, output amplifiers
are biased to the V
PHG1 and PHG2 are in high impedance state. In this configuration an output capacitor, C
each output is needed to block the V
Phantom ground configuration
In a PHG configuration the internal buffers are connected to PHG1 and PHG2 pins and biased
to the V
voltage. Therefore, no output capacitors are needed. The advantage of the PHG configuration
is the need for fewer external components as compared with a SE configuration. However, note
that the device has higher power dissipation (see
on page 26
In this configuration, PHG1 and PHG2 pins must be shorted and the connection between these
pins should be as short as possible. For best crosstalk results, in this case, each speaker
should be connected with a separate PHG wire (2 speakers connected with 4 wires) as shown
in
common PHG wire for both speakers (i.e. 2 speakers connected with 3 wires), which would give
much poorer crosstalk results.
Shutdown
When the device goes to shutdown from SE or PHG mode, PHG1 and PHG2 outputs are in a
high impedance state and OUT1 and OUT2 outputs are shorted together and connected to
bias voltage. This voltage steadily decreases as the bypass capacitor C
reaches GND voltage when C
implemented to reach the best pop performance during chip wake-up.
(MSB)
Figure 2: Phantom ground output configuration on page 4
D7
1
CC
/2 voltage. Output amplifiers (pins OUT1 and OUT2) are also biased to the V
).
I²C control byte states
D6
1
CC
D5
/2 voltage and this voltage is present on OUT1 and OUT2 pins. Pins
1
bypass
D4
1
is fully discharged. This output configuration is
CC
/2 voltage and couples the audio signal to the load.
D3
x
D2
X
Section 4.3: Power dissipation and efficiency
D1
X
. You should avoid using only one
Application Information
D0
X
b
discharges, and
Undefined State
CC
out
/2
25/36
, on