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參數資料
| 型號： | TS4657IQT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 CHANNEL, AUDIO AMPLIFIER, QCC20 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, QFN-20 |
| 文件頁數： | 25/26頁 |
| 文件大小： | 1412K |
| 代理商： | TS4657IQT |
Electrical characteristics
TS4657
8/26
3.3.1
Terminology
SNR: signal-to-noise ratio is expressed in dB. The theoretical formula is:
where Vnoise is the integrated noise from 20 Hz to 20 kHz and VH1 is the fundamental of the
signal.
For unweighted measurements, the SNR is given by:
where vnoise is the noise spectral density and u(f) is the unweighted filter transfer function
(20 Hz, 20 kHz).
For A-weighted measurements:
where vnoise is the noise spectral density and A(f) is the A-weighted filter transfer function.
Table 7.
VCC =5V, Rload= 10 kΩ, Cload = 100 pF, T = 25° C (unless otherwise specified)
Symbol
Parameter
Min.
Typ.
Max.
Unit
DR
Dynamic range; A-weighted
16-bit data; measured at -60 dBFS, FS =48kHz, Fin = 1 kHz
88
93
dB
SNR
Signal-to-noise ratio, FS =48 kHz, Fin = 1 kHz, referred to
output
Vin at -6 dBFS; A-weighted, 18-bit data input
Vin at -6 dBFS; unweighted, 18-bit data input
Vin at 0 dBFS; A-weighted, 16-bit data input
89
95
93
dB
THD+N
Total harmonic distortion and noise. Fin = 1 kHz
Vin at -20 dBFS
Vin at -6 dBFS
Vin at 0 dBFS
74
72
82.5
81.5
dB
PSRR
Power supply rejection ratio, Vripple = 200 mVpp
F= 217 Hz
F= 1 kHz
20 Hz < F < 20 kHz
80
73
48
dB
LRiso
Channel separation. 1 kHz, Vin at 0 dBFS
100
dB
Voo
Output offset voltage
-20
20
mV
Gain channel balance
-0.2
0.01
0.2
dB
twu
Wake-up time(1)
34.5
6
ms
1.
See timing diagram in application information.
SNR
dB
10
VH
1
2
V
noise
2
-------------------
log
=
SNR
dB
10
VH
1
2
uf
() v
noise f
()
2
f
d
20Hz
20kHz
∫
----------------------------------------------------------------------
log
=
SNR
dB
A
10
VH
1
2
Af
() v
noise f
()
2
f
d
20Hz
20kHz
∫
-----------------------------------------------------------------------
log
=
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