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參數(shù)資料
| 型號(hào)： | T8301 |
| 英文描述： | T8301 Internet Protocol Telephone Phone-On-A-Chip⑩ IP Solution DSP |
| 中文描述： | T8301因特網(wǎng)協(xié)議電話熱線電話在一個(gè)芯片⑩DSP的IP解決方案 |
| 文件頁(yè)數(shù)： | 18/190頁(yè) |
| 文件大?。?/td> | 1535K |
| 代理商： | T8301 |
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18
Lucent Technologies Inc.
Phone-On-A-Chip
IP Solution DSP
T8301 Internet Protocol Telephone
Advance Data Sheet
December 2000
5 Audio Input/Output Circuitry
(continued)
5.3 Analog Audio Output Channels
The T8301 contains two independent analog audio output ports. There is a single-ended output signal,
AOUTA
,
that can be connected to the speaker of a standard 150
business telephone handset or to a differential speaker
driver
SPKDRV2
. Differential speaker driver,
SPKDRV1
, can be set up to ring the phone by adding in the tone
ringer output into its audio path.
Differential speaker driver output pins (
SPKDRV1A
,
SPKDRV1B
and
SPKDRV2A
,
SPKDRV2B
) should be con-
nected to 45
speakers. Both outputs receive their analog signals from the audio codec block, which converts the
two digital input streams to analog signals.
The maximum signal from the codec is 2.5 Vp-p. The
AOUTA
signal has a maximum 2.5 Vp-p signal swing. It
should maintain a midlevel bias to prevent load noises when the driver is re-enabled. The speaker outputs
(
SPKDRV1A
,
SPKDRV1B
and
SPKDRV2A
,
SPKDRV2B
) each have 3 Vp-p signal swing. Since these outputs are
of opposite polarity, the differential signal output is 6 Vp-p. This is a 6 dB effective amplification of the codec output
signal. The signals should be biased such that, when power is re-enabled, no audible noises occur.
The differential speaker output driver does not have to produce a full 6 Vp-p signal without distortion. Signals above
5 Vp-p measured from
SPKDRVxA
to
SPKDRVxB
may be in the nonlinear range of the differential amplifier and
exhibit a flattening or clipping characteristic at the output.
AOUTA
is ac coupled to the handset speaker using a 2
μ
F capacitor. The speaker driver outputs (
SPKDRV1A,
SPKDRV1B
and
SPKDRV2A
,
SPKDRV2B
)
are direct coupled to 45
speakers.
5.4 Tone Ringer
The T8301 analog circuitry contains a tone ringer generator. When this circuit is powered up and enabled, the ring-
ing tone output is added to the current analog speaker signal and output through the differential speaker driver.
Custom tones may be generated by modifying the T8301 firmware.
Table 8. Tone Ringer Control Register (trc_reg)
Tone Ringer Control Register (trc_reg) Address (0x4008)
15:13
12
RSVD
TR_EN
Bit #
Name
11:8
7:0
TR_AC[3:0]
TR_FC[7:0]
Bit #
15:13
12
Name
RSVD
TR_EN
Description
Reserved.
Tone ringer output enable.
If 1, the tone ringer’s output is added into the speaker output path.
If 0, the tone ringer’s output is disconnected from the speaker output path.
Tone ringer amplitude control, see Table 9.
Tone ringer frequency control, see Table 10. (The tone ringer frequencies
are listed in hex format).
11:8
7:0
TR_AC[3:0]
TR_FC[7:0]
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| T8301AX | 制造商:MOLEX 制造商全稱:Molex Electronics Ltd. 功能描述:Terminator Die |
| T8301BX | 制造商:MOLEX 制造商全稱:Molex Electronics Ltd. 功能描述:Terminator Die |
| T8301DX | 制造商:MOLEX 制造商全稱:Molex Electronics Ltd. 功能描述:Terminator Die |
| T8302 | 制造商:AGERE 制造商全稱:AGERE 功能描述:T8302 Internet Protocol Telephone Advanced RISC Machine (ARM) Ethernet QoS Using IEEE 802.1q |
| T8302A | 制造商:MOLEX 制造商全稱:Molex Electronics Ltd. 功能描述:Terminator Die |
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