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AD7091R-4BCPZ bảng dữ liệu(PDF) 11 Page - Analog Devices

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Data Sheet
AD7091R-2/AD7091R-4/AD7091R-8
Rev. C | Page 11 of 42
Figure 9. 8-Channel, 24-Lead TSSOP Pin Configuration
Figure 10. 8-Channel, 24-Lead LFCSP Pin Configuration
Table 7. 8-Channel, 24-Lead LFCSP and 24-Lead TSSOP Pin Function Descriptions
Pin No.
Mnemonic
Description
TSSOP
LFCSP
1
23
CS
Chip Select Input. When CS is held low, the serial bus enables, and CS frames the output data
on the SPI.
2
24
RESET
Reset. Logic input.
3
1
VDD
Power Supply Input. The VDD range is from 2.7 V to 5.25 V. Decouple this supply pin to GND.
4
2
REGCAP
Decoupling Capacitor Pin for Voltage Output from Internal Regulator. Decouple this output pin
separately to GND using a 1.0 μF capacitor.
5
3
REFIN/REFOUT
Voltage Reference Output, 2.5 V. Decouple this pin to GND. Typical recommended decoupling
capacitor value is 2.2 μF. The user can either access the internal 2.5 V reference or overdrive the
internal reference with the voltage applied to this pin. The reference voltage range for an
externally applied reference is 1.0 V to VDD.
6, 19
4, 17
GND
Chip Ground Pins. These pins are the ground reference point for all circuitry on the AD7091R-8.
7
5
MUXOUT
Multiplexer Output. The output of the multiplexer appears at this pin. If no external filtering or
buffering is required, tie this pin directly to the ADCIN pin; otherwise, tie the output of the
conditioning network to the ADCIN pin.
8
6
VIN0
Analog Input 0. Single-ended analog input. The analog input range is 0 V to VREF.
9
7
VIN2
Analog Input 2. Single-ended analog input. The analog input range is 0 V to VREF.
10
8
ALERT/BUSY/GPO0
Alert Output Pin (ALERT). This is a multifunction pin determined by the configuration register.
When functioning as ALERT, this pin is a logic output indicating that a conversion result has
fallen outside the limit of the register settings.
When the ALERT/BUSY/GPO0 pin is configured as a BUSY output, use this pin to indicate when a
conversion is taking place.
The pin can also function as a general-purpose digital output.
11
9
VIN4
Analog Input 4. Single-ended analog input. The analog input range is 0 V to VREF.
12
10
VIN6
Analog Input 6. Single-ended analog input. The analog input range is 0 V to VREF.
13
11
VIN7
Analog Input 7. Single-ended analog input. The analog input range is 0 V to VREF.
14
12
VIN5
Analog Input 5. Single-ended analog input. The analog input range is 0 V to VREF.
15
13
GPO1
General-Purpose Digital Output.
16
14
VIN3
Analog Input 3. Single-ended analog input. The analog input range is 0 V to VREF.
17
15
VIN1
Analog Input 1. Single-ended analog input. The analog input range is 0 V to VREF.
18
16
ADCIN
ADC Input. This pin allows access to the on-chip track-and-hold. If no external filtering or
buffering is required, tie this pin directly to the MUXOUT pin; otherwise, tie the input of the
conditioning network to the MUXOUT pin.
1
2
3
4
5
6
7
8
9
10
12
11
RESET
VDD
REGCAP
MUXOUT
GND
CS
VIN0
VIN2
VIN6
VIN4
ALERT/BUSY/GPO0
20
21
22
23
24
19
18
17
16
15
14
13
CONVST
SCLK
SDO
ADCIN
GND
SDI
VIN1
VIN3
VIN7
VIN5
GPO1
VDRIVE
AD7091R-8
TOP VIEW
(Not to Scale)
REFIN/REFOUT
2
1
3
4
5
6
18
17
16
15
14
13
AD7091R-8
TOP VIEW
(Not to Scale)
VDD
REGCAP
MUXOUT
GND
VIN0
REFIN/REFOUT
ADCIN
GND
SDI
VIN1
VIN3
GPO1
NOTES
1. THE EXPOSED PAD IS NOT CONNECTED
INTERNALLY. IT IS RECOMMENDED THAT
THE PAD BE SOLDERED TO GND.


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