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ADS8505 Arkusz danych(PDF) 5 Page - Texas Instruments

Numer części ADS8505
Szczegółowy opis  16-BIT 250-KSPS SAMPLING CMOS ANALOG-TO-DIGITAL CONVERTER
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Strona internetowa  http://www.ti.com
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ADS8505 Arkusz danych(HTML) 5 Page - Texas Instruments

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ADS8505
SLAS180B – SEPTEMBER 2005 – REVISED JUNE 2007
DEVICE INFORMATION (continued)
Terminal Functions
TERMINAL
DIGITAL
DESCRIPTION
I/O
NAME
DB/DW NO.
AGND1
2
Analog ground. Used internally as ground reference point.
AGND2
5
Analog ground.
BUSY
26
O
At the start of a conversion, BUSY goes low and stays low until the conversion is
completed and the digital outputs have been updated.
BYTE
23
I
Selects 8 most significant bits (low) or 8 least significant bits (high).
CAP
4
Reference buffer capacitor. 2.2-
µF Tantalum capacitor to ground.
CS
25
I
Internally ORed with R/C. If R/C is low, a falling edge on CS initiates a new conversion.
DGND
14
Digital ground.
D15 (MSB)
6
O
Data bit 15. Most significant bit (MSB) of conversion results. Hi-Z state when CS is
high, or when R/C is low.
D14
7
O
Data bit 14. Hi-Z state when CS is high, or when R/C is low.
D13
8
O
Data bit 13. Hi-Z state when CS is high, or when R/C is low.
D12
9
O
Data bit 12. Hi-Z state when CS is high, or when R/C is low.
D11
10
O
Data bit 11. Hi-Z state when CS is high, or when R/C is low.
D10
11
O
Data bit 10. Hi-Z state when CS is high, or when R/C is low.
D9
12
O
Data bit 9. Hi-Z state when CS is high, or when R/C is low.
D8
13
O
Data bit 8. Hi-Z state when CS is high, or when R/C is low.
D7
15
O
Data bit 7. Hi-Z state when CS is high, or when R/C is low.
D6
16
O
Data bit 6. Hi-Z state when CS is high, or when R/C is low.
D5
17
O
Data bit 5. Hi-Z state when CS is high, or when R/C is low.
D4
18
O
Data bit 4. Hi-Z state when CS is high, or when R/C is low.
D3
19
O
Data bit 3. Hi-Z state when CS is high, or when R/C is low.
D2
20
O
Data bit 2. Hi-Z state when CS is high, or when R/C is low.
D1
21
O
Data bit 1. Hi-Z state when CS is high, or when R/C is low.
D0 (LSB)
22
O
Data bit 0. Least significant bit (LSB) of conversion results. Hi-Z state when CS is high,
or when R/C is low.
R/C
24
I
With CS low and BUSY high, a falling edge on R/C initiates a new conversion. With CS
low, a rising edge on R/C enables the parallel output.
REF
3
Reference input/output. 2.2-
µF Tantalum capacitor to ground.
VANA
27
Analog supply input. Nominally +5 V. Decouple to ground with 0.1-
µF ceramic and
10-
µF tantalum capacitors.
VDIG
28
Digital supply input. Nominally +5 V. Connect directly to pin 27. Must be
≤ V
ANA.
VIN
1
Analog input. See Figure 28.
5
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