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參數(shù)資料
| 型號： | TS4974IQT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻控制 |
| 英文描述： | 1 CHANNEL(S), VOLUME CONTROL CIRCUIT, DSO10 |
| 封裝： | 3 X 3 MM, 0.50 MM PITCH, ROHS COMPLIANT, DFN-10 |
| 文件頁數(shù)： | 11/25頁 |
| 文件大小： | 319K |
| 代理商： | TS4974IQT |
TS4974
Application information
19/25
4.4
Decoupling of the circuit
Two capacitors are needed to correctly bypass the TS4974. A power supply bypass
capacitor CS and a bias voltage bypass capacitor Cb.
CS has particular influence on the THD+N in the high frequency region (above 7 kHz) and
an indirect influence on power supply disturbances. With a value for CS of 1 F, you can
expect similar THD+N performance to that shown in the datasheet.
In the high frequency region, if CS is lower than 1 F, it increases the THD+N, and
disturbances on the power supply rail are less filtered.
On the other hand, if CS is higher than 1 F, the disturbances on the power supply rail are
more filtered.
Cb has an influence on THD+N at lower frequencies, but its function is critical to the final
result of PSRR (with input grounded and in the lower frequency region).
4.5
Wake-up time (tWU)
When the standby is released to put the device ON, the bypass capacitor Cb is not charged
immediately. As Cb is directly linked to the bias of the amplifier, the bias will not work
properly until the Cb voltage is correct. The time to reach this voltage is called the wake-up
with Cb=1 F. During the wake-up phase, the TS4974 gain is close to zero. After the wake-
up time, the gain is released and set to its nominal value.
Figure 40.
Startup time vs. bypass capacitor
4.6
Shutdown time
When the standby command is set, the time required to put the two output stages in high
impedance and the internal circuitry in shutdown mode is a few microseconds.
Note:
In shutdown mode, the Bypass pin and Vin+, Vin- pins are short-circuited to ground by
internal switches. This allows a quick discharge of Cb and Cin capacitors.
0,4
0,8
1,2
1,6
2,0
0
5
10
15
Tamb=25
°C
Vcc=2.6V
Vcc=3.3V
Vcc=5V
St
a
rtup
Time
(
m
s
)
Bypass Capacitor Cb (
μF)
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