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AD7689BCPZ Scheda tecnica(PDF) 10 Page - Analog Devices

Il numero della parte AD7689BCPZ
Spiegazioni elettronici  16-Bit, 4-Channel/8-Channel, 250 kSPS PulSAR ADC
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

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AD7682/AD7689
Data Sheet
Rev. D | Page 10 of 32
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
PIN 1
INDICATOR
1
VDD
2
REF
NOTES
1. NC = NO CONNECT.
2. THE EXPOSED PAD IS NOT CONNECTED
INTERNALLY. FOR INCREASED
RELIABILITY OF THE SOLDER JOINTS, IT
IS RECOMMENDED THAT THE PAD BE
SOLDERED TO THE SYSTEM
GROUND PLANE.
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 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
NOTES
1. THE EXPOSED PAD IS NOT CONNECTED
INTERNALLY. FOR INCREASED
RELIABILITY OF THE SOLDER JOINTS, IT
IS RECOMMENDED THAT THE PAD BE
SOLDERED TO THE SYSTEM
GROUND PLANE.
Figure 5. AD7689 Pin Configuration
Table 7. 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 a2.5 V output, the minimum should be 3.0 V.
When using the internal reference for 4.096 V output, the minimum should be 4.6 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 of
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 − 0.5 V maximum), which
is 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 0.1 μF capacitor.
When using the internal reference buffer, apply a source between 0.5 V and (VDD − 0.5 V)
that is buffered to the REF pin, as described in the REF pin description.
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 input channels, IN[7:0], can be referenced to a common-
mode point of 0 V or VREF/2 V.
11
CNV
CNV
DI
Conversion Input. On the rising edge, CNV initiates the conversion. During conversion, if
CNV is held low, 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 SDO and clock in data
on DIN in an MSB first fashion.


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