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AD7606BSTZ-6RL 参数 Datasheet PDF下载

AD7606BSTZ-6RL图片预览
型号: AD7606BSTZ-6RL
PDF下载: 下载PDF文件 查看货源
内容描述: 8 / 6 / 4通道DAS,内置16位,双极性输入,同步采样ADC [8-/6-/4-Channel DAS with 16-Bit,Bipolar Input,Simultaneous Sampling ADC]
分类和应用: 转换器模数转换器
文件页数/大小: 36 页 / 781 K
品牌: ADI [ ADI ]
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AD7606/AD7606-6/AD7606-4  
Internal Reference Mode  
INTERNAꢀ/EXTERNAꢀ REFERENCE  
One AD7606/AD7606-6/AD7606-4 device, configured to operate  
in the internal reference mode, can be used to drive the remaining  
AD7606/AD7606-6/AD7606-4 devices, which are configured to  
operate in external reference mode (see Figure 42). The REFIN/  
REFOUT pin of the AD7606/AD7606-6/AD7606-4, configured  
in internal reference mode, should be decoupled using a 10 μF  
ceramic decoupling capacitor. The other AD7606/AD7606-6/  
AD7606-4 devices, configured in external reference mode,  
should use at least a 100 nF decoupling capacitor on their  
REFIN/REFOUT pins.  
The AD7606/AD7606-6/AD7606-4 contain an on-chip 2.5 V  
bandgap reference. The REFIN/REFOUT pin allows access to  
the 2.5 V reference that generates the on-chip 4.5 V reference  
internally, or it allows an external reference of 2.5 V to be applied  
to the AD7606/AD7606-6/AD7606-4. An externally applied  
reference of 2.5 V is also gained up to 4.5 V, using the internal  
buffer. This 4.5 V buffered reference is the reference used by the  
SAR ADC.  
The REF SELECT pin is a logic input pin that allows the user to  
select between the internal reference or an external reference.  
If this pin is set to logic high, the internal reference is selected  
and enabled. If this pin is set to logic low, the internal reference  
is disabled and an external reference voltage must be applied  
to the REFIN/REFOUT pin. The internal reference buffer is  
always enabled. After a reset, the AD7606/AD7606-6/AD7606-4  
operate in the reference mode selected by the REF SELECT pin.  
Decoupling is required on the REFIN/REFOUT pin for both  
the internal and external reference options. A 10 μF ceramic  
capacitor is required on the REFIN/REFOUT pin.  
REFIN/REFOUT  
SAR  
REFCAPA  
BUF  
10µF  
REFCAPB  
2.5V  
REF  
Figure 40. Reference Circuitry  
The AD7606/AD7606-6/AD7606-4 contain a reference buffer  
configured to gain the REF voltage up to ~4.5 V, as shown in  
Figure 40. The REFCAPA and REFCAPB pins must be shorted  
together externally, and a ceramic capacitor of 10 ꢀF applied to  
REFGND, to ensure that the reference buffer is in closed-loop  
operation. The reference voltage available at the REFIN/REFOUT  
pin is 2.5 V.  
AD7606  
AD7606  
AD7606  
REF SELECT  
REF SELECT  
REF SELECT  
REFIN/REFOUT  
REFIN/REFOUT  
REFIN/REFOUT  
100nF  
100nF  
100nF  
ADR421  
0.1µF  
When the AD7606/AD7606-6/AD7606-4 are configured in  
external reference mode, the REFIN/REFOUT pin is a high  
input impedance pin. For applications using multiple AD7606  
devices, the following configurations are recommended,  
depending on the application requirements.  
Figure 41. Single External Reference Driving Multiple AD7606/AD7606-6/  
AD7606-4 REFIN Pins  
V
DRIVE  
External Reference Mode  
AD7606  
AD7606  
AD7606  
REF SELECT  
REF SELECT  
REF SELECT  
One ADR421 external reference can be used to drive the  
REFIN/REFOUT pins of all AD7606 devices (see Figure 41).  
In this configuration, each REFIN/REFOUT pin of the  
AD7606/AD7606-6/AD7606-4 should be decoupled with at  
least a 100 nF decoupling capacitor.  
REFIN/REFOUT  
REFIN/REFOUT  
REFIN/REFOUT  
+
10µF  
100nF  
100nF  
Figure 42. Internal Reference Driving Multiple AD7606/AD7606-6/AD7606-4  
REFIN Pins  
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