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EVAL-AD7366CBZ 参数 Datasheet PDF下载

EVAL-AD7366CBZ图片预览
型号: EVAL-AD7366CBZ
PDF下载: 下载PDF文件 查看货源
内容描述: 真双极性输入,双1レS, 12 / 14位,双通道SAR型ADC [True Bipolar Input, Dual 1 レs, 12-/14-Bit, 2-Channel SAR ADCs]
分类和应用:
文件页数/大小: 28 页 / 634 K
品牌: ADI [ ADI ]
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AD7366/AD7367  
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS  
D
V
A
1
2
24 DGND  
OUT  
23  
22  
D
B
DRIVE  
OUT  
BUSY  
DV  
CC  
3
AD7366/  
AD7367  
4
21 CNVST  
20 SCLK  
19 CS  
RANGE1  
RANGE0  
ADDR  
5
TOP VIEW  
6
(Not to Scale)  
AGND  
7
18 REFSEL  
17 AGND  
AV  
CC  
8
D
A
D
B
CAP  
16  
15  
14  
13  
9
CAP  
V
10  
11  
12  
V
SS  
DD  
V
V
V
A1  
A2  
B1  
B2  
V
Figure 2. Pin Configuration  
Table 6. Pin Function Descriptions  
Pin No.  
Mnemonic  
Description  
1, 23  
DOUTA, DOUT  
B
Serial Data Outputs. The data output is supplied to each pin as a serial data stream. The bits are clocked out on  
the falling edge of the SCLK input and 12 SCLK cycles are required to access the data from the AD7366 while 14  
SCLK cycle are required for the AD7367. The data simultaneously appears on both pins from the simultaneous  
conversions of both ADCs. The data stream consists of the 12 bits of conversion data for the AD7366 and 14 bits  
for the AD7367 and is provided MSB first. If CS is held low for a further 12 SCLK cycles for the AD7366 or 14 SCLK  
cycles for the AD7367, on either DOUTA or DOUTB, the data from the other ADC follows on that DOUT pin. This  
allows data from a simultaneous conversion on both ADCs to be gathered in serial format on either DOUTA or  
D
OUTB using only one serial port. See the Serial Interface section for more information.  
2
3
VDRIVE  
Logic Power Supply Input. The voltage supplied at this pin determines at what voltage the interface operates.  
This pin should be decoupled to DGND. The voltage range on this pin is 2.7 V to 5.25 V and may be different to  
the voltage at AVCC and DVCC, but should never exceed either by more than 0.3 V. To achieve a throughput rate  
of 1.12 MSPS for the AD7366 or 1 MSPS for the AD7367, VDRIVE must be greater than or equal to 4.75 V.  
Digital Supply Voltage, 4.75 V to 5.25 V. The DVCC and AVCC voltages should ideally be at the same potential.  
For best performance, it is recommended that the DVCC and AVCC pins be shorted together, to ensure that the  
voltage difference between them never exceeds 0.3 V even on a transient basis. This supply should be decoupled  
to DGND. Place 10 μF and 100 nF decoupling capacitors on the DVCC pin.  
DVCC  
4, 5  
6
RANGE1,  
RANGE0  
ADDR  
Analog Input Range Selection, Logic Inputs. The polarity on these pins determines the input range of the analog  
input channels. See the Analog Inputs section and Table 8 for details.  
Multiplexer Select, Logic Input. This input is used to select the pair of channels to be simultaneously converted,  
either Channel 1 of both ADC A and ADC B, or Channel 2 of both ADC A and ADCB. The logic state on this pin is  
latched on the rising edge of BUSY to set up the multiplexer for the next conversion.  
7, 17  
8
AGND  
Analog Ground. Ground reference point for all analog circuitry on the AD7366/AD7367. All analog input signals  
and any external reference signal should be referred to this AGND voltage. Both AGND pins should connect to  
the AGND plane of a system. The AGND and DGND voltages ideally should be at the same potential and must  
not be more than 0.3 V apart, even on a transient basis.  
Analog Supply Voltage, 4.75 V to 5.25 V. This is the supply voltage for the ADC cores. The AVCC and DVCC voltages  
should ideally be at the same potential. For best performance, it is recommended that the DVCC and AVCC pins be  
shorted together, to ensure that the voltage difference between them never exceeds 0.3 V even on a transient  
basis. This supply should be decoupled to AGND. Place 10 μF and 100 nF decoupling capacitors on the AVCC pin.  
AVCC  
9, 16  
10  
DCAPA, DCAP  
B
Decoupling Capacitor Pins. Decoupling capacitors are connected to these pins to decouple the reference buffer  
for each respective ADC. For best performance, it is recommended to use a 680 nF decoupling capacitor on  
these pins. Provided the output is buffered, the on-chip reference can be taken from these pins and applied  
externally to the rest of a system.  
Negative Power Supply Voltage. This is the negative supply voltage for the high voltage analog input structure  
of the AD7366/AD7367. The supply must be less than a maximum voltage of −11.5 V for all input ranges. See  
Table 7 for further details. Place 10 μF and 100 nF decoupling capacitors on the VSS pin.  
VSS  
11, 12  
13, 14  
15  
VA1, VA2  
VB2, VB1  
VDD  
Analog Inputs of ADC A. These are both single-ended analog inputs. The analog input range on these channels  
is determined by the RANGE0 and RANGE1 pins.  
Analog Inputs of ADC B. These are both single-ended analog inputs. The analog input range on these channels  
is determined by the RANGE0 and RANGE1 pins.  
Positive Power Supply Voltage. This is the positive supply voltage for the high voltage analog input structure  
AD7366/AD7367. The supply must be greater than a minimum voltage of 11.5 V for all the analog input ranges.  
See Table 7 for further details. Place 10 μF and 100 nF decoupling capacitors on the VDD pin.  
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