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AD7699 Folha de dados(PDF) 8 Page - Analog Devices

Nome de Peças AD7699
Descrição Electrónicos  16-Bit, 8-Channel, 250 kSPS PulSAR짰 ADC.
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

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AD7689
Preliminary Technical Data
Rev. PrC | Page 8 of 20
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
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
Figure 4. 20-Lead LFCSP Pin Configuration
Table 7. Pin Function Descriptions
Pin No.
Mnemonic
Type1
Description
1, 20
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 2.5V output, the minimum should be 2.7V.
When using the internal reference for 4.096V output, the minimum should be 4.5V.
2
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 = 2.5V or
4.096V.
When the internal reference is disabled and the buffer is enabled, REF produces a buffered
version of the voltage present on the REFIN pin (4.096V max.) useful when using low cost, low
power references.
For improved drift performance, connect a precision reference to REF (0.5V to VDD).
For any reference method, this pin needs decoupling with an external a 22 μF capacitor
connected as close to REF as possible. See the Reference Decoupling section.
3
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 0.5V to 4.096V which is
buffered to the REF pin as described above.
4, 5
GND
AI
Power Supply Ground.
6 - 9
IN4 – IN7
AI
Channel 4 through Channel 7 Analog Inputs.
10
COM
AI
Common Channel Input. All channels [7:0] can be referenced to a common mode point of 0 V or
VREF/2 V.
11
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
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
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.
14
SDO
DO
Serial Data Output. The conversion result is output on this pin synchronized to SCK. In unipolar
modes, conversion results are straight binary; in bipolar modes conversion results are twos
complement.
15
VIO
P
Input/Output Interface Digital Power. Nominally at the same supply as the host interface (1.8 V,
2.5 V, 3 V, or 5 V).
16 - 19
IN0 – IN3
AI
Channel 0 through Channel 3 Analog Inputs.
1AI = analog input, AI/O = analog input/output, DI = digital input, DO = digital output, and P = power.


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