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AD7190 Arkusz danych(PDF) 9 Page - Analog Devices

Numer części AD7190
Szczegółowy opis  4.8 kHz Ultra-Low Noise 24-Bit Sigma-Delta ADC with PGA
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Preliminary Technical Data
AD7190
Rev.PrD 7/08 | Page 9
Pin No.
Mnemonic
Description
AIN4 or as a pseudo-differential input when used with AINCOM.
14
AIN4
Analog Input. It can be configured as the negative input of a fully differential input pair when used with
AIN3 or as a pseudo-differential input when used with AINCOM.
15
REFIN1(+)
Positive Reference Input. An external reference can be applied between REFIN1(+) and REFIN1(−).
REFIN1(+) can lie anywhere between AVDD and GND + 1 V. The nominal reference voltage, (REFIN1(+) −
REFIN1(−)), is AVDD, but the part functions with a reference from 1 V to AVDD.
16
REFIN1(−)
Negative Reference Input. This reference input can lie anywhere between GND and AVDD − 1 V.
17
BPDSW
Low Side Power Switch to AGND.
18
AGND
Analog Ground Reference Point.
19
DGND
Digital Ground Reference Point.
20
AVDD
Analog Supply Voltage, 3 V to 5.25 V. AVDD is independent of DVDD. Therefore DVDD can be operated at 3 V
with AVDD at 5 V or vice versa.
21
DVDD
Digital Supply Voltage, 2.7 V to 5.25 V. DVDD is independent of AVDD. Therefore AVDD can be operated at 3 V
with DVDD at 5 V or vice versa.
22
SYNC
Logic Input that allows for synchronization of the digital filters and analog modulators when using a
number of AD7190 devices. While SYNC is low, the nodes of the digital filter, the filter control logic and the
calibration control logic are reset and the analog modulator is also held in its reset state. SYNC does not
affect the digital interface but does reset RDY to a high state if it is low. SYNC has a pull- up resistor
internally to DVDD.
23
DOUT/RDY
Serial Data Output/Data Ready Output. DOUT/RDYserves a dual purpose. It functions as a serial data
output pin to access the output shift register of the ADC. The output shift register can contain data from
any of the on-chip data or control registers. In addition, DOUT/RDYoperates as a data ready pin, going low
to indicate the completion of a conversion. If the data is not read after the conversion, the pin will go high
before the next update occurs.
The DOUT/RDY falling edge can be used as an interrupt to a processor, indicating that valid data is
available. With an external serial clock, the data can be read using the DOUT/RDY pin. With CS low, the
data/control word information is placed on the DOUT/RDY pin on the SCLK falling edge and is valid on the
SCLK rising edge.
24
DIN
Serial Data Input to the Input Shift Register on the ADC. Data in this shift register is transferred to the
control registers within the ADC, the register selection bits of the communications register identifying the
appropriate register.


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