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1402 参数 Datasheet PDF下载

1402图片预览
型号: 1402
PDF下载: 下载PDF文件 查看货源
内容描述: 串行12位, 2.2Msps采样ADC ,带有关断 [Serial 12-Bit, 2.2Msps Sampling ADC with Shutdown]
分类和应用:
文件页数/大小: 24 页 / 281 K
品牌: Linear [ Linear ]
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LTC1402  
U
TYPICAL APPLICATION  
Using Quad Cable Drivers/Receivers in Remote  
unshielded cable. Using these devices, the LTC1402’s  
serial data can be transmitted up to 100 feet without data  
corruption. Because the SCK, CONV and DOUT signals  
originate at the LTC1402, they arrive at the serial port with  
similar delays and remain synchronized. When the data is  
received at the serial port of the DSP or other controller,  
the port must be programmed to respond to the appropri-  
ate SCK and CONV edges. It is also necessary to check  
where the 12-bit output DATA resides in the 16-bit data  
frame. The TMS320C54x serial port READ instructions  
canshiftthe12-bitdatatothepreferredpositionwithinthe  
16-bit data frame.  
LTC1402 Applications  
In some applications, the host controller or main proces-  
sor may be located some distance from the sensor, the  
signal conditioning circuitry, and the ADC. In these appli-  
cations, maintaining serial data integrity over long cable  
distances can be a challenge. The circuit in Figure 15  
showsonewaytoconveytheLTC1402’shigh-speedserial  
data over a long distance. The circuit uses the LTC1688  
quad cable driver and an LTC1520 quad cable receiver to  
transmit/receive the LTC1402’s high-speed 35.2Mbps  
serial data to the DSPs serial port over category-5  
5V  
5V  
DV  
DD  
10µF  
11  
16  
15  
10  
9
16  
0V  
DD  
16  
2
1
2
V
DD  
3
4
1
3
5
+
100Ω  
100Ω  
100Ω  
100Ω  
100Ω  
100Ω  
BFSR  
A
CONV  
SCK  
IN  
3
TMS320C54x  
BCLKR  
SIGNAL  
6
6
7
9
A
D
OUT  
IN  
7
5
OGND  
LTC1402  
10  
10  
11  
BDR  
GND  
9
8
4
11  
8
CATEGORY-5  
UNSHIELDED CABLE  
UP TO 100 FEET  
REMEE PART NO.  
5A244UTPM30BU  
CONV  
2.2Msps  
4
15  
12  
14  
14  
15  
13  
CLK  
13  
35.2MHz  
PIN 4 = ENA  
PIN12 = ENB  
LTC1688  
QUAD DRIVER  
LTC1520  
QUAD RECEIVER  
Figure 15. The LTC1402 3-Wire Serial Port Sends Data Over 100 Feet of Category-5  
Twisted Pair with the LTC1688/LTC1520 Quad Driver/Receiver Pairs  
22  
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