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AD4004 Arkusz danych(PDF) 10 Page - Analog Devices

Numer części AD4004
Szczegółowy opis  Precision, Pseudo Differential, SAR ADCs
Download  36 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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AD4004 Arkusz danych(HTML) 10 Page - Analog Devices

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AD4000/AD4004/AD4008
Data Sheet
Rev. C | Page 10 of 36
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
REF
1
VDD
2
IN+ 3
IN–
4
GND
5
VIO
10
SDI
9
SCK
8
SDO
7
CNV
6
AD4000/
AD4004
TOP VIEW
(Not to Scale)
Figure 3. 10-Lead MSOP Pin Configuration
1
REF
2
VDD
3
IN+
4
IN–
5
GND
10 VIO
9
SDI
8
SCK
7
SDO
6
CNV
AD4000/
AD4004/
AD4008
TOP VIEW
(Not to Scale)
NOTES
1. CONNECT THE EXPOSED PAD TO GND.
THIS CONNECTION IS NOT REQUIRED TO
MEET THE SPECIFIED PERFORMANCE.
Figure 4. 10-Lead LFCSP Pin Configuration
Table 7. Pin Function Descriptions
Pin No.
Mnemonic
Type1
Description
1
REF
AI
Reference Input Voltage. The VREF range is 2.4 V to 5.1 V. This pin is referred to the GND pin and must be
decoupled closely to the GND pin with a 10 µF, X7R ceramic capacitor.
2
VDD
P
1.8 V Power Supply. The VDD range is 1.71 V to 1.89 V. Bypass VDD to GND with a 0.1 μF ceramic capacitor.
3
IN+
AI
Analog Input. This input is referred to analog ground sense pin (IN−). The device samples the voltage
differential between IN+ and IN− on the leading edge on CNV. The operating input range of IN+ − IN− is
0 V to VREF.
4
IN−
AI
Analog Input Ground Sense. Connect this pin to the analog ground plane or to a remote sense ground.
5
GND
P
Power Supply Ground.
6
CNV
DI
Convert Input. This input has multiple functions. On its leading edge, it initiates the conversions and selects
the interface mode of the device: daisy-chain mode or CS mode. In CS mode, the SDO pin is enabled
when CNV is low. In daisy-chain mode, the data is read when CNV is high.
7
SDO
DO
Serial Data Output. The conversion result is output on this pin. It is synchronized to SCK.
8
SCK
DI
Serial Data Clock Input. When the device is selected, the conversion result is shifted out by this clock.
9
SDI
DI
Serial Data Input. This input provides multiple features. It selects the interface mode of the ADC as follows.
Daisy-chain mode is selected if SDI is low during the CNV rising edge. In this mode, SDI is used as a data
input to daisy-chain the conversion results of two or more ADCs onto a single SDO line. The digital data
level on SDI is output on SDO with a delay of 16 SCK cycles.
CS mode is selected if SDI is high during the CNV rising edge. In this mode, either SDI or CNV can enable
the serial output signals when low. If SDI or CNV is low when the conversion is complete, the busy indicator
feature is enabled. With CNV low, the device can be programmed by clocking in a 16-bit word on SDI on
the rising edge of SCK.
10
VIO
P
Input/Output Interface Digital Power. Nominally, this pin is at the same supply as the host interface (1.8 V,
2.5 V, 3 V, or 5 V). Bypass VIO to GND with a 0.1 μF ceramic capacitor.
N/A2
EPAD
P
Exposed Pad (LFCSP Only). Connect the exposed pad to GND. This connection is not required to meet
the specified performance.
1
AI is analog input, P is power, DI is digital input, and DO is digital output.
2
N/A means not applicable.


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