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参数资料
| 型号： | TDA7284 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2 CHANNEL, AUDIO PREAMPLIFIER, PDIP14 |
| 封装： | DIP-14 |
| 文件页数： | 14/14页 |
| 文件大小： | 3669K |
| 代理商： | TDA7284 |
Usually such an increase drives the op-amp into
saturation and the time for which it remains in this
condition is called the limiting time(T1).
T1 depends on the relationship between the ex-
ternal capacitances, the time constant T=R1
C1,
the supply voltage and the signal variation.
The criteria for choosing the length of T1 are the
result of several compromises. In particular if T1
is too long, there will be audible distortion during
playback (during T1 the output is a square
wave),and if it is too short, the sensation of in-
creased level will be lost while dynamic compres-
sion phenomena and instability may occur.
The time for return to nominal level is defined as
the total time between the instant To and the in-
stant in which the output reassumes the nominal
value. This time (Ts) is roughly equal to 5
T1.
On the basis of tests carried out it has been found
that a musical signal with high dynamic range
(
VI =+40 dB) is to be recorded, the best value of
Ts is between 200 and 300ms.
Recovery time.
let us now suppose that at the instant To the input
signal decreases of
Vi (fig. 18).
The recovery time (Trec) is defined as the time
between the instant To and the instant in which
the output signal returns to the nominal level.
This time depends essentially on the discharge
time constant of R2
C2 ( see fig. 16) and on the
size of the step -
Vi. In this case too, if this time
is too long the signal to noise ratio on the tape de-
teriorates.
If it is too short the sensation of the low signal
level is lost during playback.
The ALC system of the TDA7284
Fig. 16 becomes the following (fig. 19) where the
Figure 17: Limiting and Level Setting Time
Figure 18: Recovery Time
Figure 19
TDA7284
9/14
相关PDF资料 |
PDF描述 |
|---|---|
| TDA7284D | 2 CHANNEL, AUDIO PREAMPLIFIER, PDSO14 |
| TDA7285 | SPECIALTY CONSUMER CIRCUIT, PDIP20 |
| TDA7285D | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| TDA7293V | 100 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
| TDA7293HS | 100 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA7284D | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:RECORD/PLAYBACK CIRCUIT WITH ALC |
| TDA7285 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:STEREO CASSETTE PLAYER AND MOTOR SPEED CONTROLLER |
| TDA7285D | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:STEREO CASSETTE PLAYER AND MOTOR SPEED CONTROLLER |
| TDA7286 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:SINGLE CHIP PREAMPLIFIER FOR DOUBLE DECK RADIO CASSETTE RECORDER |
| TDA7286D | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:SINGLE CHIP PREAMPLIFIER FOR DOUBLE DECK RADIO CASSETTE RECORDER |
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