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ADS8481IBPFBR Arkusz danych(PDF) 9 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
Numer części ADS8481IBPFBR
Szczegółowy opis  18-BIT, 1-MSPS, PSEUDO-DIFFERENTIAL UNIPOLAR INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE
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Producent  BURR-BROWN [Burr-Brown (TI)]
Strona internetowa  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

ADS8481IBPFBR Arkusz danych(HTML) 9 Page - Burr-Brown (TI)

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ADS8481
SLAS385A – FEBRUARY 2006 – REVISED MARCH 2006
PIN ASSIGNMENTS (continued)
TERMINAL FUNCTIONS
NAME
NO RGZ
I/O
DESCRIPTION
8, 9, 17, 20,
AGND
23, 24, 26,
Analog ground
27
BDGND
37
Digital ground for bus interface digital supply
BUSY
48
O
Status output. High when a conversion is in progress.
Bus size select input. Used for selecting 18-bit or 16-bit wide bus transfer.
0: Data bits output on the 18-bit data bus pins DB[17:0].
BUS18/16
2
I
1: Last two data bits D[1:0] from 18-bit wide bus output on:
a) the low byte pins DB[9:2] if BYTE = 0
b) the high byte pins DB[17:10] if BYTE = 1
Byte select input. Used for 8-bit bus reading.
BYTE
3
I
0: No fold back
1: Low byte D[9:2] of the 16 most significant bits is folded back to high byte of the 16 most significant pins DB[17:10].
CONVST
4
I
Convert start. The falling edge of this input ends the acquisition period and starts the hold period.
CS
6
I
Chip select. The falling edge of this input starts the acquisition period.
8-BIT BUS
16-BIT BUS
18-BIT BUS
Data Bus
BYTE = 0
BYTE = 1
BYTE = 1
BYTE = 0
BYTE = 0
BYTE = 0
BUS18/16 = 0
BUS18/16 = 0
BUS18/16 = 1
BUS18/16 = 0
BUS18/16 = 1
BUS18/16 = 0
DB17
28
O
D17 (MSB)
D9
All ones
D17 (MSB)
All ones
D17 (MSB)
DB16
29
O
D16
D8
All ones
D16
All ones
D16
DB15
30
O
D15
D7
All ones
D15
All ones
D15
DB14
31
O
D14
D6
All ones
D14
All ones
D14
DB13
32
O
D13
D5
All ones
D13
All ones
D13
DB12
33
O
D12
D4
All ones
D12
All ones
D12
DB11
34
O
D11
D3
D1
D11
All ones
D11
DB10
35
O
D10
D2
D0 (LSB)
D10
All ones
D10
DB9
38
O
D9
All ones
All ones
D9
All ones
D9
DB8
39
O
D8
All ones
All ones
D8
All ones
D8
DB7
40
O
D7
All ones
All ones
D7
All ones
D7
DB6
41
O
D6
All ones
All ones
D6
All ones
D6
DB5
42
O
D5
All ones
All ones
D5
All ones
D5
DB4
43
O
D4
All ones
All ones
D4
All ones
D4
DB3
44
O
D3
All ones
All ones
D3
D1
D3
DB2
45
O
D2
All ones
All ones
D2
D0 (LSB)
D2
DB1
46
O
D1
All ones
All ones
D1
All ones
D1
DB0
47
O
D0 (LSB)
All ones
All ones
D0 (LSB)
All ones
D0 (LSB)
–IN
19
I
Inverting input channel
+IN
18
I
Noninverting input channel
NC
15
No connection
REFIN
13
I
Reference input
REFOUT
14
O
Reference output. Add 1-
µF capacitor between the REFOUT pin and REFM pin when internal reference is used.
REFM
11, 12
I
Reference ground
Synchronization pulse for the parallel output. When CS is low, this serves as output enable and puts the previous
RD
5
I
conversion results on the bus.
7, 10, 16,
+VA
Analog power supplies, 5-V DC
21, 22, 25
+VBD
1, 36
Digital power supply for bus
9
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