- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383876 > T8502 (Lineage Power) Dual PCM Codecs with Filters(帶濾波器的雙PCM編解碼器) PDF資料下載
參數(shù)資料
| 型號： | T8502 |
| 廠商： | Lineage Power |
| 元件分類： | Codec |
| 英文描述： | Dual PCM Codecs with Filters(帶濾波器的雙PCM編解碼器) |
| 中文描述： | 雙的PCM編解碼器與過濾器（帶濾波器的雙的PCM編解碼器） |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 370K |
| 代理商： | T8502 |
2
Lucent Technologies Inc.
Data Sheet
July 1998
T8502 and T8503 Dual PCM Codecs with Filters
Functional Description
Two channels of PCM data input and output are passed
through only two ports, D
X
and D
R
, so some type of
time-slot assignment is necessary. The scheme used
here is to utilize a fixed-data rate mode of 32 or 64 time
slots corresponding to master clock frequencies of
either 2.048 MHz or 4.096 MHz, respectively. Each
device has four frame sync (FS
X
and FS
R
) inputs, one
pair for each channel. During a single 125
μ
s frame,
each frame sync input is supplied a single pulse. The
timing of the respective frame sync pulse indicates the
beginning of the time slot during which the data for that
channel is clocked in or out of the device. FS
X
and FS
R
must be high for a minimum of one master clock cycle.
They can be operated independently, or they can be
tied together for coincident transmit and receive data
transfer. During a frame, channel 0 and 1 transmit
frame sync pulses must be separated from each other
by one or more time slots. Likewise, channel 0 and 1
receive frame sync pulses must be separated from
each other by one or more time slots. Both transmit and
receive frame strobes must be derived from master
clock, but they do not need to be byte aligned.
A channel is placed in standby mode by removing both
FS
X
and FS
R
for 500
μ
s. Note, if any one of those
pulses (per channel) is removed, operation is indeter-
minate. Standby mode reduces overall device power
consumption by turning off nonessential circuitry. Criti-
cal circuits that ensure a fast, quiet powerup are kept
active. Master clock need not be active when both
channels are in standby mode.
The frequency of the master clock must be either
2.048 MHz or 4.096 MHz. Internal circuitry determines
the master clock frequency during the powerup reset
interval.
The analog input section in Figure 2 includes an on-
chip op amp that is used in conjunction with external,
user-supplied resistors to vary encoder passband gain.
The feedback resistance (RF) should range from 10 k
to 200 k
, and capacitance from GS
X
to ground should
be kept to less than 50 pF. The input signal at VF
X
IN
should be ac coupled. For best performance, the maxi-
mum gain of this op amp should be limited to 20 dB or
less. Gain in the receive path is selectable via the GS
pins as either 0 dB or –3.5 dB.
5-3786.a
Figure 2. Typical Analog Input Section
Pin Information
5-3788.b
Figure 3. Pin Diagram
VF
X
IN
TO
CODEC
FILTERS
2.4 V
GAIN =
R
F
R
I
GS
X
R
F
C
I
R
I
–
+
VF
X
IN0
GS
X
0
GS0
FS
R
0
MCLK
GNDD
D
R
D
X
VF
X
IN1
GS
X
1
ASEL
FS
R
1
FS
X
1
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
FS
X
0
T-8502
T-8503
VF
R
O0
GNDA0
V
DD
VF
R
O1
GNDA1
GS1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| T8503 | Dual PCM Codecs with Filters(帶濾波器的雙PCM編解碼器) |
| T8531 | Tone Processing(音調(diào)處理器件) |
| T8531A | Tone Processing(音調(diào)處理器件) |
| T8532 | Multichannel Programmable Codec Chip Set(多通道可編程編解碼器芯片組) |
| T8534 | Quad Programmable Line Card Signal Processor(四通道可編程線卡信號處理器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| T8503 | 制造商:AGERE 制造商全稱:AGERE 功能描述:T8502 and T8503 Dual PCM Codecs with Filters |
| T850-600G | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH PERFORMANCE TRIAC |
| T850H-6G | 功能描述:雙向可控硅 Hi temp 8A 雙向可控硅 RoHS:否 制造商:STMicroelectronics 開啟狀態(tài) RMS 電流 (It RMS):16 A 不重復通態(tài)電流:120 A 額定重復關(guān)閉狀態(tài)電壓 VDRM:600 V 關(guān)閉狀態(tài)漏泄電流（在 VDRM IDRM 下）:5 uA 開啟狀態(tài)電壓: 保持電流（Ih 最大值）:45 mA 柵觸發(fā)電壓 (Vgt):1.3 V 柵觸發(fā)電流 (Igt):1.75 mA 最大工作溫度: 安裝風格:Through Hole 封裝 / 箱體:TO-220AB |
| T850H-6G-TR | 功能描述:雙向可控硅 Hi temp 8A 雙向可控硅 RoHS:否 制造商:STMicroelectronics 開啟狀態(tài) RMS 電流 (It RMS):16 A 不重復通態(tài)電流:120 A 額定重復關(guān)閉狀態(tài)電壓 VDRM:600 V 關(guān)閉狀態(tài)漏泄電流（在 VDRM IDRM 下）:5 uA 開啟狀態(tài)電壓: 保持電流（Ih 最大值）:45 mA 柵觸發(fā)電壓 (Vgt):1.3 V 柵觸發(fā)電流 (Igt):1.75 mA 最大工作溫度: 安裝風格:Through Hole 封裝 / 箱體:TO-220AB |
| T850H-6I | 功能描述:雙向可控硅 Hi temp 8A 雙向可控硅 RoHS:否 制造商:STMicroelectronics 開啟狀態(tài) RMS 電流 (It RMS):16 A 不重復通態(tài)電流:120 A 額定重復關(guān)閉狀態(tài)電壓 VDRM:600 V 關(guān)閉狀態(tài)漏泄電流（在 VDRM IDRM 下）:5 uA 開啟狀態(tài)電壓: 保持電流（Ih 最大值）:45 mA 柵觸發(fā)電壓 (Vgt):1.3 V 柵觸發(fā)電流 (Igt):1.75 mA 最大工作溫度: 安裝風格:Through Hole 封裝 / 箱體:TO-220AB |
發(fā)布緊急采購，3分鐘左右您將得到回復。