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AD7173-8BCPZ-RL Arkusz danych(PDF) 10 Page - Analog Devices

Numer części AD7173-8BCPZ-RL
Szczegółowy opis  Low Power, 8-/16-Channel, 31.25 kSPS, 24-Bit, Highly Integrated Sigma-Delta ADC
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Strona internetowa  http://www.analog.com
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AD7173-8
Data Sheet
Pin
No.
Mnemonic
Type1
Description
15
DIN
DI
Serial Data Input to the Input Shift Register on the ADC. Data in this shift register is transferred to the
control registers in the ADC, with the register address (RA) bits of the communications register identifying
the appropriate register. Data is clocked in on the rising edge of SCLK.
16
SCLK
DI
Serial Clock Input. This serial clock input is for data transfers to and from the ADC. SCLK has a Schmitt
trigger input, making the interface suitable for opto-isolated applications.
17
CS
DI
Chip Select Input. This is an active low logic input used to select the ADC. CS can be used to select the ADC
in systems with more than one device on the serial bus. CS can be hardwired low, allowing the ADC to operate
in 3-wire mode with SCLK, DIN, and DOUT used to interface with the device. When CS is high, the
DOUT/RDY output is tristated.
18
ERROR
DI/O
This pin can be used in one of the following 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 pin.
The 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
GPIO1 and GPIO2 pins. The ERROR pin has an active pull-up in this case.
19
SYNC
DI
Synchronization Input. Allows synchronization of the digital filters and analog modulators when using
multiple AD7173-8 devices.
20
IOVDD
P
Digital I/O Supply Voltage. IOVDD voltage ranges from 2 V to 5 V. IOVDD is independent of AVDD1 and
AVDD2. For example, IOVDD can be operated at 3.3 V when AVDD1 or 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.
21
DGND
P
Digital Ground.
22
REGCAPD
AO
Digital LDO Regulator Output. This pin is for decoupling purposes only. Decouple this pin to DGND using
a 1 µF capacitor.
23
GPIO0
DI/O
General-Purpose Input/Output. Logic input/output on this this pin is referred to the AVDD1 and AVSS supplies.
24
GPIO1
DI/O
General-Purpose Input/Output. Logic input/output on this this pin is referred to the AVDD1 and AVSS supplies.
25
GPO2
DO
General-Purpose Output. Logic output on this this pin is referred to the AVDD1 and AVSS supplies.
26
AIN4
AI
Analog Input 4. Selectable through cross point mux.
27
AIN5
AI
Analog Input 5. Selectable through cross point mux.
28
AIN6
AI
Analog Input 6. Selectable through cross point mux.
29
AIN7
AI
Analog Input 7. Selectable through cross point mux.
30
AIN8
AI
Analog Input 8. Selectable through cross point mux.
31
AIN9
AI
Analog Input 9. Selectable through cross point mux.
32
AIN10
AI
Analog Input 10. Selectable through cross point mux.
33
AIN11
AI
Analog Input 11. Selectable through cross point mux.
34
AIN12
AI
Analog Input 12. Selectable through cross point mux.
35
AIN13
AI
Analog Input 13. Selectable through cross point mux.
36
AIN14
AI
Analog Input 14. Selectable through cross point mux.
37
AIN15
AI
Analog Input 15. Selectable through cross point mux.
38
GPO3
DO
General-Purpose Output. Logic output on this this pin is referred to the AVDD1 and AVSS supplies.
39
REF−
AI
Reference 1 Input Negative Terminal. REF− can span from AVSS to AVDD1 − 1 V. Reference 1 can be
selected through the REFSEL bits in the SETUP CONFIGURATION register.
40
REF+
AI
Reference 1 Input Positive Terminal. An external reference can be applied between REF+ and REF−. REF+
can span from AVDD1 to AVSS + 1 V. Reference 1 can be selected through the REFSEL bits in the SETUP
CONFIGURATION register.
EP
P
Exposed Pad. The exposed pad should be soldered to a similar pad on the PCB under the exposed paddle
to confer mechanical strength to the package and for heat dissipation. The exposed pad must be connected
to AVSS through this pad on the PCB.
1
AI = analog input, AO = analog output, DI/O = bidirectional digital input/output, DO = digital output, DI = digital input, P = power supply.
Rev. 0 | Page 10 of 64


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