DEMOTS2007Q STMicroelectronics, DEMOTS2007Q Datasheet - Page 23

• Manufacturer Part Number: DEMOTS2007Q
• Description: BOARD DEMO FOR TS2007IQT
• Manufacturer: STMicroelectronics

Specifications of DEMOTS2007Q

• Amplifier Type: Class D
• Output Type: 1-Channel (Mono)
• Max Output Power X Channels @ Load: 2.8W x 1 @ 4 Ohm
• Voltage - Supply: 2.4 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Board Type: Fully Populated
• Utilized Ic / Part: TS2007
• Product: Audio Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6360

TS2007
4.5
4.6
Note:
So, for a desired cut-off frequency F
with F
The input impedance Z
is also a tolerance around the typical value (see
tolerance, you can also calculate tolerance of the F
●
●
Decoupling of the circuit
A power supply capacitor, referred to as C
The TS2007 has a typical switching frequency of 280kHz and output fall and rise time about
5ns. Due to these very fast transients, careful decoupling is mandatory.
A 1µF ceramic capacitor is enough, but it must be located very close to the TS2007 in order
to avoid any extra parasitic inductance created by a long track wire. Parasitic loop
inductance, in relation with di/dt, introduces overvoltage that decreases the global efficiency
of the device and may cause, if this parasitic inductance is too high, a TS2007 breakdown.
In addition, even if a ceramic capacitor has an adequate high frequency ESR value, its
current capability is also important. A 0603 size is a good compromise, particularly when a
4Ω load is used.
Another important parameter is the rated voltage of the capacitor. A 1µF/6.3V capacitor
used at 5V, loses about 50% of its value. With a power supply voltage of 5V, the decoupling
value, instead of 1µF, could be reduced to 0.5µF. As C
THD+N in the medium to high frequency region, this capacitor variation becomes decisive.
In addition, less decoupling means higher overshoots which can be problematic if they reach
the power supply AMR value (6V).
Wake-up time (t
When the standby is released to set the device ON, there is a wait of 5ms typically. The
TS2007 has an internal digital delay that mutes the outputs and releases them after this
time in order to avoid any pop noise.
The gain increases smoothly (see
pin
(Section
F
F
CLmax
CLmin
CL
in Hz, Z
=
=
4.2).
0.915
1.103
in
in Ω and C
⋅
⋅
F
F
CL
in
CL
wu
is for the whole power supply voltage range, typically 75k
)
in
in F.
Figure
F
C
CL
CL
in
=
we can calculate C
=
--------------------------------------------- -
2
------------------------------------------- -
2
49) from the mute to the gain selected by the GS
S,
⋅
⋅
is needed to correctly bypass the TS2007.
π
π
⋅
⋅
Z
1
1
Table 5
Z
in
in
CL
⋅
⋅
F
:
C
S
CL
in
has particular influence on the
to
in
Table
:
9). With regard to the
Application information
Ω
. There
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