STEVAL-CCA008V1 STMicroelectronics, STEVAL-CCA008V1 Datasheet - Page 21

• Manufacturer Part Number: STEVAL-CCA008V1
• Description: BOARD EVAL BASED ON TS4998
• Manufacturer: STMicroelectronics

Specifications of STEVAL-CCA008V1

• Amplifier Type: Class AB
• Output Type: 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 1W x 2 @ 8 Ohm
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Board Type: Fully Populated
• Utilized Ic / Part: TS4998
• Description/function: Audio Amplifiers
• Operating Supply Voltage: 2.7 V to 5.5 V
• Output Power: 1 W
• Product: Audio Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: TS4998
• Kit Application Type: Amplifier
• Application Sub Type: Stereo Audio Power Amplifier
• Kit Contents: Board
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: TS4998
• Other names: 497-8259

TS4998
Note:
4.4
Due to the tolerance on the internal 50kΩ feedback resistors, the differential gain will be in
the range (no tolerance on R
The difference of resistance between input resistors of each channel have direct influence
on the PSRR, CMRR and other amplifier parameters. In order to reach maximum
performance, we recommend matching the input resistors R
maximum tolerance of 1%.
For the rest of this section, Av
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. This range depends upon the
values of V
following formula:
Equation 2
with V
The result of the calculation must be in the range:
Due to the +/-20% tolerance on the 50kΩ feedback resistors R
also important to check that the V
If the result of the V
used.
Example: V
With internal resistors R
V
the feedback resistors, with R
and with R
These values are not in range from GND to V
capacitors are required. Alternatively, you can change the V
CC
= 2.7V and V
CC
in volts, R
feed
CC
CC
ICM
V
, R
ICM
= 60kΩ , it is V
= 2.7V,
limitation of the input stage (see
IN
ic
=
and R
IN
= 2.2V, which gives V
CC
ICM
V
------------------------------------------------------------------------- - V
V
-------------------------------------------------------------------------- -
CC
in kΩ and
CC
/2 for any DC common mode bias input voltage.
A
calculation is not in this range, an input coupling capacitor must be
feed
×
V
2
×
feed
2
= 2, and V
R
×
R
×
IN
= 50kΩ, calculated external resistors are R
(
IN
ICM
IN
(
R
(
V
feed
diff
R
+
A
):
+
IN
ic
V
IN
2
). To have a good estimation of the V
2
= 1.95V.
will be called A
+
=
×
= 40kΩ the common mode input voltage is V
+
ICM
×
40kΩ
V
R
Diff
------------------------------------------------------ -
GND V
V
ic
40kΩ
------------- - A
ic
remains in this range at the tolerance limits:
feed
R
ic
= 2.2V.
×
IN
input+
×
)
40kΩ
)
≤
ICM
R
≤
feed
ICM
V
2
+
= 1.92V. Taking into account the tolerance on
diff
CC
Diff
≤
≤
≤
V
=
60kΩ
------------- -
V
- 1V = 1.7V, therefore input coupling
ICM
R
Table 3 on page
input-
to simplify the mathematical expressions.
CC
V
-------------------------------------------------------------------------- - V
IN
CC
≤
–
V
------------------------------------------------------------------------- - V
1V
×
CC
2
R
×
×
IN
2
(
(V)
R
R
ic
×
IN1
+
IN
IN
feed
value.
2
(
R
, R
+
×
+
IN
50kΩ
2
V
(no tolerance on R
IN2
4), the common mode
Application information
+
×
ic
60kΩ
, R
×
V
ICM
)
ic
50kΩ
IN
IN3
×
value, use the
)
= R
60kΩ
, and R
( )
feed
ICM
( )
/
A
IN4
= 1.87V
V
= 25kΩ ,
IN
with a
), it is
21/33