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AD7177-2BRUZ-RL7 Arkusz danych(PDF) 11 Page - Analog Devices

Numer części AD7177-2BRUZ-RL7
Szczegółowy opis  32-Bit, 10 kSPS, Sigma-Delta ADC with 100 關s Settling and True Rail-to-Rail Buffers
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Data Sheet
AD7177-2
Rev. A | Page 11 of 59
Pin No.
Mnemonic
Type2
Description
15
SYNC/ERROR
DI/O
Synchronization Input/Error Input or Output. This pin can be switched between a logic input and a
logic output in the GPIOCON register. When the synchronization input (SYNC) is enabled, this pin
allows synchronization of the digital filters and analog modulators when using multiple AD7177-2
devices. For more information, see the Synchronization section. When the synchronization input is
disabled, this pin can be used in one of three modes:
Active low error input mode: this mode sets the ADC_ERROR bit in the status register.
Active low, open-drain error output mode: the status register error bits are mapped to the ERROR
output. The SYNC/ERROR pins of multiple devices can be wired together to a common pull-up resistor
so that an error on any device can be observed.
General-purpose output mode: the status of the pin is controlled by the ERR_DAT bit in the GPIOCON
register. The pin is referenced between IOVDD and DGND, as opposed to the AVDD1 and AVSS levels
used by the GPIOx pins. The pin has an active pull-up circuit in this case.
16
IOVDD
P
Digital I/O Supply Voltage. The IOVDD voltage ranges from 2 V to 5.5 V. IOVDD is independent of
AVDD2. For example, IOVDD can be operated at 3 V when AVDD2 equals 5 V, or vice versa. If AVSS is
set to −2.5 V, the voltage on IOVDD must not exceed 3.6 V.
17
DGND
P
Digital Ground.
18
REGCAPD
AO
Digital LDO Regulator Output. This pin is for decoupling purposes only. Decouple this pin to DGND
using a 1 µF and a 0.1 µF capacitor.
19
GPIO0
DI/O
General-Purpose Input/Output 0. The pin is referenced between AVDD1 and AVSS levels.
20
GPIO1
DI/O
General-Purpose Input/Output 1. The pin is referenced between AVDD1 and AVSS levels.
21
AIN0
AI
Analog Input 0. This pin is selectable through the crosspoint multiplexer.
22
AIN1
AI
Analog Input 1. This pin is selectable through the crosspoint multiplexer.
23
AIN2
AI
Analog Input 2. This pin is selectable through the crosspoint multiplexer.
24
AIN3
AI
Analog Input 3. This pin is selectable through the crosspoint multiplexer.
1
Note that, throughout this data sheet, the dual function pin names are referenced by the relevant function only.
2
AI is analog input, AO is analog output, P is power supply, DI is digital input, DO is digital output, and DI/O is bidirectional digital input/output.


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