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ADS7806UB Arkusz danych(PDF) 4 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
Numer części ADS7806UB
Szczegółowy opis  Low-Power 12-Bit Sampling CMOS ANALOG-to-DIGITAL CONVERTER
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Producent  BURR-BROWN [Burr-Brown (TI)]
Strona internetowa  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

ADS7806UB Arkusz danych(HTML) 4 Page - Burr-Brown (TI)

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4
®
ADS7806
DIGITAL
PIN #
NAME
I/O
DESCRIPTION
TABLE I. Pin Assignments.
ANALOG
CONNECT R1IN
CONNECT R2IN
INPUT
VIA 200
VIA 100
RANGE
TO
TO
IMPEDANCE
±10V
VIN
CAP
45.7k
0V to 5V
AGND
VIN
20.0k
0V to 4V
VIN
VIN
21.4k
TABLE II. Input Range Connections. See also Figure 7.
PIN CONFIGURATION
V
DIG
V
ANA
REFD
PWRD
BUSY
CS
R/C
BYTE
TAG
SDATA
DATACLK
D0
D1
D2
R1
IN
AGND1
R2
IN
CAP
REF
AGND2
SB/BTC
EXT/INT
D7
D6
D5
D4
D3
DGND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
ADS7806
1R1IN
Analog Input. See Figure 7.
2
AGND1
Analog Sense Ground.
3R2IN
Analog Input. See Figure 7.
4
CAP
Reference Buffer Output. 2.2
µF tantalum capacitor to ground.
5
REF
Reference Input/Output. 2.2
µF tantalum capacitor to ground.
6
AGND2
Analog Ground.
7
SB/BTC
I
Selects Straight Binary or Binary Two’s Complement for Output Data Format.
8
EXT/INT
I
External/Internal data clock select.
9
D7
O
Data Bit 3 if BYTE is HIGH. Data bit 11 (MSB) if BYTE is LOW. Hi-Z when CS is HIGH and/or R/C is LOW. Leave
unconnected when using serial output.
10
D6
O
Data Bit 2 if BYTE is HIGH. Data bit 10 if BYTE is LOW. Hi-Z when CS is HIGH and/or R/C is LOW.
11
D5
O
Data Bit 1 if BYTE is HIGH. Data bit 9 if BYTE is LOW. Hi-Z when CS is HIGH and/or R/C is LOW.
12
D4
O
Data Bit 0 (LSB) if BYTE is HIGH. Data bit 8 if BYTE is LOW. Hi-Z when CS is HIGH and/or R/C is LOW.
13
D3
O
LOW if BYTE is HIGH. Data bit 7 if BYTE is LOW. Hi-Z when CS is HIGH and/or R/C is LOW.
14
DGND
Digital Ground.
15
D2
O
LOW if BYTE is HIGH. Data bit 6 if BYTE is LOW. Hi-Z when CS is HIGH and/or R/C is LOW.
16
D1
O
LOW if BYTE is HIGH. Data bit 5 if BYTE is LOW. Hi-Z when CS is HIGH and/or R/C is LOW.
17
D0
O
LOW if BYTE is HIGH. Data bit 4 if BYTE is LOW. Hi-Z when CS is HIGH and/or R/C is LOW.
18
DATACLK
I/O
Data Clock Output when EXT/INT is LOW. Data clock input when EXT/INT is HIGH.
19
SDATA
O
Serial Output Synchronized to DATACLK.
20
TAG
I
Serial Input When Using an External Data Clock.
21
BYTE
I
Selects 8 most significant bits (LOW) or 4 least significant bits (HIGH) on parallel output pins.
22
R/C
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.
23
CS
I
Internally OR’d with R/C. If R/C is LOW, a falling edge on CS initiates a new conversion. If EXT/INT is LOW, this same
falling edge will start the transmission of serial data results from the previous conversion.
24
BUSY
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.
25
PWRD
I
PWRD HIGH shuts down all analog circuitry except the reference. Digital circuitry remains active.
26
REFD
I
REFD HIGH shuts down the internal reference. External reference will be required for conversions.
27
VANA
Analog Supply. Nominally +5V. Decouple with 0.1
µF ceramic and 10µF tantalum capacitors.
28
VDIG
Digital Supply. Nominally +5V. Connect directly to pin 27. Must be
≤ V
ANA.


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