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參數(shù)資料
| 型號： | TDA9870A |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Digital TV Sound Processor DTVSP |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP64 |
| 封裝： | SHRINK, PLASTIC, DIP |
| 文件頁數(shù)： | 17/88頁 |
| 文件大小： | 362K |
| 代理商： | TDA9870A |
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1998 Aug 10
17
Philips Semiconductors
Product specification
Digital TV Sound Processor (DTVSP)
TDA9870A
6.3.5
L
INE OUTPUT
The line output can provide an unprocessed copy of the
audio signal in the loudspeaker channels. This can be
either an external signal that comes from the dual audio
ADC, or a signal from an internal digital audio source that
comes from the dual audio DAC. The line output employs
amplifiers with two gain settings. The 3 dB position is
needed to compensate for the attenuation at the SCART
inputs, while the 0 dB position is needed, for example, for
non-attenuated external or internal digital signals
(see Section 6.3.4).
6.3.6
L
OUDSPEAKER
(
MAIN
)
AND HEADPHONE
(
AUXILIARY
)
OUTPUTS
Signals from any audio source can be applied to the
loudspeaker and to the headphone output channels via the
digital crossbar switch and the DSP.
6.3.7
D
UAL AUDIO
DAC
The TDA9870A contains three dual audio DACs, one for
the connection from the DSP to the analog crossbar switch
section and two for the loudspeaker and headphone
outputs. Each of the three dual low-noise high-dynamic
range DACs consists of two 15-bit DACs with current
outputs, followed by a buffer operational amplifier.
The audio DACs operate with four-fold oversampling and
noise shaping.
6.3.8
D
UAL AUDIO
ADC
There is one dual audio ADC in the TDA9870A for the
connection of the analog crossbar switch section to the
DSP. The dual audio ADC consists of two bitstream
3rd-order sigma-delta audio ADCs and a high-order
decimation filter.
6.3.9
S
TANDBY MODE
The standby mode (subaddress 1, bit 5) disables most
functions and reduces power dissipation. The analog
crossbar switch and the SCART section remains
operational and can be controlled by the I
2
C-bus to
support copying of analog signals from
SCART-to-SCART.
Unused internal registers may lose their information in
standby mode. Therefore, the device needs to be
initialized on returning to normal operation. This can be
accomplished in the same way as after a power-on reset.
6.3.10
S
UPPLY GROUND
The different supply grounds V
SSX
are internally
connected via substrate. It is therefore recommended to
connect all ground pins externally close to the pins by a
copper plane.
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