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参数资料
| 型号： | TP3057WMX/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 5/18页 |
| 文件大小： | 0K |
| 描述： | IC INTERFACE ENHANCED SER 16SOIC |
| 标准包装： | 1,000 |
| 类型： | PCM 编解码器/滤波器 |
| 数据接口： | 串行 |
| ADC / DAC 数量： | 1 / 2 |
| 三角积分调变： | 无 |
| 电压 - 电源，模拟： | ±5V |
| 电压 - 电源，数字： | ±5V |
| 工作温度： | -25°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 带卷 (TR) |
| 其它名称： | TP3057WMX |
Applications Information
POWER SUPPLIES
While the pins of the TP305X family are well protected
against electrical misuse it is recommended that the stan-
dard CMOS practice be followed ensuring that ground is
connected to the device before any other connections are
made In applications where the printed circuit board may be
plugged into a ‘‘hot’’ socket with power and clocks already
present an extra long ground pin in the connector should
be used
All ground connections to each device should meet at a
common point as close as possible to the GNDA pin This
minimizes the interaction of ground return currents flowing
through a common bus impedance 01 mF supply decou-
pling capacitors should be connected from this common
ground point to VCC and VBB as close to the device as
possible
For best performance the ground point of each CODEC
FILTER on a card should be connected to a common card
ground in star formation rather than via a ground bus
This common ground point should be decoupled to VCC and
VBB with 10 mF capacitors
RECEIVE GAIN ADJUSTMENT
For applications where a TP305X family CODECfilter re-
ceive output must drive a 600X load but a peak swing lower
than g25V is required the receive gain can be easily ad-
justed by inserting a matched T-pad or q-pad at the output
Table II lists the required resistor values for 600X termina-
tions As these are generally non-standard values the equa-
tions can be used to compute the attenuation of the closest
practical set of resistors It may be necessary to use un-
equal values for the R1 or R4 arms of the attenuators to
achieve a precise attenuation Generally it is tolerable to
allow a small deviation of the input impedance from nominal
while still maintaining a good return loss For example a 30
dB return loss against 600X is obtained if the output imped-
ance of the attenuator is in the range 282X to 319X (as-
suming a perfect transformer)
T-Pad Attenuator
R1 e Z1
N
2 a 1
N2 b 1
J b20Z1Z2 N
N2 b 1
J
R2 e 2
0Z1Z2
N
N2 b 1
J
Where N e
0 POWERIN
POWER OUT
and
S e
0Z1Z2
Also Z e
0ZSC ZOC
Where ZSC e impedance with short circuit termination
and ZOC e impedance with open circuit termination
q-Pad Attenuator
TLH5510 – 5
R3 e
0Z1Z2
2
N
2 b 1
N
J
R3 e Z1
N
2 b 1
N2 b 2NS a 1
J
Note
See Application Note 370 for further details
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TP3057-X | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Extended Temperature Serial Interface CODEC/Filter COMBO Family |
| TP3058 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:MICROPROCESSOR COMPATIBLE COMBO-R |
| TP3058J | 制造商:未知厂家 制造商全称:未知厂家 功能描述:u-Law CODEC |
| TP3059 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:MICROPROCESSOR COMPATIBLE COMBO-R |
| TP3059J | 制造商:NSC 制造商全称:National Semiconductor 功能描述:MICROPROCESSOR COMPATIBLE COMBO-R |
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