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AD7682BCPZ Datenblatt(PDF) 9 Page - Analog Devices

Teilenummer AD7682BCPZ
Bauteilbeschribung  16-Bit, 4-Channel/8-Channel, 250 kSPS PulSAR ADC
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7682BCPZ Datenblatt(HTML) 9 Page - Analog Devices

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AD7682/AD7689
Rev. 0 | Page 9 of 28
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
PIN 1
INDICATOR
1
VDD
2
REF
NC = NO CONNECT
3
REFIN
4
GND
5
GND
13 SCK
14 SDO
15 VIO
12 DIN
11 CNV
TOP VIEW
(Not to Scale)
AD7682
Figure 4. AD7682 20-Lead LFCSP (QFN) Pin Configuration
PIN 1
INDICATOR
1
VDD
2
REF
3
REFIN
4
GND
5
GND
13 SCK
14 SDO
15 VIO
12 DIN
11 CNV
TOP VIEW
(Not to Scale)
AD7689
Figure 5. AD7689 20-Lead LFCSP (QFN) Pin Configuration
Table 6. Pin Function Descriptions
Pin
No.
AD7682
Mnemonic
AD7689
Mnemonic
Type1
Description
1, 20
VDD
VDD
P
Power Supply. Nominally 2.5 V to 5.5 V when using an external reference and decoupled
with 10 μF and 100 nF capacitors.
When using the internal reference for 2.5 V output, the minimum should be 2.7 V.
When using the internal reference for 4.096 V output, the minimum should be 4.5 V.
2
REF
REF
AI/O
Reference Input/Output. See the Voltage Reference Output/Input section.
When the internal reference is enabled, this pin produces a selectable system
reference = 2.5 V or 4.096 V.
When the internal reference is disabled and the buffer is enabled, REF produces a
buffered version of the voltage present on the REFIN pin (VDD – 0.3 V maximum) useful
when using low cost, low power references.
For improved drift performance, connect a precision reference to REF (0.5 V to VDD).
For any reference method, this pin needs decoupling with an external 10 μF capacitor
connected as close to REF as possible. See the Reference Decoupling section.
3
REFIN
REFIN
AI/O
Internal Reference Output/Reference Buffer Input. See the Voltage Reference
Output/Input section.
When using the internal reference, the internal unbuffered reference voltage is present
and needs decoupling with a 0.1μF capacitor.
When using the internal reference buffer, apply a source between 0.5 V and 4.096 V that
is buffered to the REF pin as described above.
4, 5
GND
GND
P
Power Supply Ground.
6
NC
IN4
AI
AD7682: No connection.
AD7689: Analog Input Channel 4.
7
IN2
IN5
AI
AD7682: Analog Input Channel 2.
AD7689: Analog Input Channel 5.
8
NC
IN6
AI
AD7682: No connection.
AD7689: Analog Input Channel 6.
9
IN3
IN7
AI
AD7682: Analog Input Channel 3.
AD7689: Analog Input Channel 7.
10
COM
COM
AI
Common Channel Input. All channels [3:0] or [7:0] can be referenced to a common mode
point of 0 V or VREF/2 V.
11
CNV
CNV
DI
Convert Input. On the rising edge, CNV initiates the conversion. During conversion, if
CNV is held high, the busy indictor is enabled.
12
DIN
DIN
DI
Data Input. This input is used for writing to the 14-bit configuration register. The
configuration register can be written to during and after conversion.
13
SCK
SCK
DI
Serial Data Clock Input. This input is used to clock out the data on ADO and clock in data
on DIN in an MSB first fashion.


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