參數(shù)資料
型號(hào)： TA2123AF
廠商： Toshiba Corporation
英文描述： 1.5V Stereo Headphone Amplifier
中文描述： 1.5V的立體聲耳機(jī)放大器
文件頁(yè)數(shù)： 7/20頁(yè)
文件大?。?/td> 427K
代理商： TA2123AF
TA2123AF
2002-10-30
7
Application Note
1. Preamplifier stage
(1) Output DC voltage of preamplifier
Output DC voltage of preamplifier is determined
by external resistors R1 and R2 as shown in Fig.1.
V
O (PRE)
= V
REF OUT
V × (R2 / R1 + 1)
V
REF OUT
= 0.73V (typ.)
V is an offset voltage which is designed to 28.6mV.
It is as follows in case that the DC voltage is calculated by the constant of a test circuit.
V
O (PRE)
= 0.73V 28.6mV (200k
/ 22k
+ 1)
=0.44V
Output DC voltage of preamplifier should be fixed about V
CC
/ 2, because preamplifier get a enough
dynamic range.
(2) AMS (automatic music sensor) function
A block diagram is shown in Fig.2. This function can AMS (automatic music sensor) and BS (blank skip).
The comparator input level is higher than comparator sensitivity.
→
Rectangle wave is outputted.
The comparator input level is lower than comparator sensitivity.
→
High level is outputted.
The sensitivity changeover is determined by AMS switch (the comparator sensitivity doesn’t change.).
Automatic music sensor mode
The AMS SW is also turned on when the MT SW is turned on. And the comparator input level is
determined by external resistors (R4~R6) and capacitors (C3, C4) from mixer amplifier output
level.
The transfer function is as follows.
V
O
/ V
i
= R3 / [R1
R2 / (R1 + R2)] × {j
ω
C4
R5
R6 / [R4
R5 + j
ω
(C3
R4
R5 + C4
R4
R5 +
C4
R4
R6 + C4
R5
R6)
ω
2
C3
C4
R4
R5
R6]}
Fig.1
Output DC voltage of preamplifier
+
⊿
V = 28.6mV
V
REF OUT
R1
R2
+
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