參數(shù)資料
型號： TS4998IQT
廠商： STMICROELECTRONICS
元件分類： 音頻／視頻放大
英文描述： 1 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC16
封裝： 4 X 4 MM, ROHS COMPLIANT, QFN-16
文件頁數(shù)： 14/33頁
文件大?。?/td> 488K
代理商： TS4998IQT
TS4998
Application information
21/33
Due to the tolerance on the internal 50k
Ωfeedback resistors, the differential gain will be in
the range (no tolerance on RIN):
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 RIN1, RIN2, RIN3, and RIN4 with a
maximum tolerance of 1%.
Note:
For the rest of this section, Avdiff will be called AV to simplify the mathematical expressions.
4.4
Common mode feedback loop limitations
As explained previously, the common mode feedback loop allows the output DC bias voltage
to be averaged at VCC/2 for any DC common mode bias input voltage.
Due to the VICM limitation of the input stage (see Table 3 on page 4), the common mode
feedback loop can fulfil its role only within the defined range. This range depends upon the
values of VCC, RIN and Rfeed (AV). To have a good estimation of the VICM value, use the
following formula:
Equation 2
with VCC in volts, RIN in kΩ and
The result of the calculation must be in the range:
Due to the +/-20% tolerance on the 50k
Ω feedback resistors Rfeed (no tolerance on RIN), it is
also important to check that the V
ICM remains in this range at the tolerance limits:
If the result of the VICM calculation is not in this range, an input coupling capacitor must be
used.
Example: VCC =2.7V, AV = 2, and Vic =2.2V.
With internal resistors Rfeed = 50kΩ, calculated external resistors are RIN = Rfeed/AV = 25kΩ,
VCC = 2.7V and Vic = 2.2V, which gives VICM = 1.92V. Taking into account the tolerance on
the feedback resistors, with Rfeed = 40kΩ the common mode input voltage is VICM =1.87V
and with Rfeed = 60kΩ, it is VICM =1.95V.
These values are not in range from GND to VCC - 1V = 1.7V, therefore input coupling
capacitors are required. Alternatively, you can change the Vic value.
40k
Ω
R
IN
-------------- A
V
diff
60k
Ω
R
IN
--------------
≤≤
V
ICM
V
CC
R
IN
×
2V
ic
R
feed
×
+
2R
IN
R
feed
+
()
×
---------------------------------------------------------------------------
V
CC
R
IN
×
2V
ic
50k
Ω
×
+
2R
IN
50k
Ω
+
()
×
--------------------------------------------------------------------------- V
()
==
V
ic
Diff
input+
Diff
input-
+
2
-------------------------------------------------------
(V)
=
GND V
ICM
V
CC
1V
–
≤≤
V
CC
R
IN
×
2V
ic
40k
Ω
×
+
2R
IN
40k
Ω
+
()
×
--------------------------------------------------------------------------
V
ICM
≤
V
CC
R
IN
×
2V
ic
60k
Ω
×
+
2R
IN
60k
Ω
+
()
×
-------------------------------------------------------------------------- V
()
≤
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