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ADS7881 Arkusz danych(PDF) 7 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
Numer części ADS7881
Szczegółowy opis  12-BIT, 4-MSPS LOW POWER SAR 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)

ADS7881 Arkusz danych(HTML) 7 Page - Burr-Brown (TI)

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ADS7881
SLAS400B − SEPTEMBER 2003 − REVISED NOVEMBER 2005
www.ti.com
7
TERMINAL FUNCTIONS
NAME
NO. PFB
NO. RGZ
I/O
DESCRIPTION
DATA BUS
8-Bit Bus
16-Bit Bus
DATA BUS
BYTE = 0
BYTE = 1
BYTE = 0
DB11
16
28
O
D11 (MSB)
D3
D11 (MSB)
DB10
17
29
O
D10
D2
D10
DB9
18
30
O
D9
D1
D9
DB8
19
31
O
D8
D0 (LSB)
D8
DB7
20
32
O
D7
0
D7
DB6
21
33
O
D6
0
D6
DB5
22
34
O
D5
0
D5
DB4
23
35
O
D4
0
D4
DB3
26
38
O
D3
0
D3
DB2
27
39
O
D2
0
D2
DB1
28
40
O
D1
0
D1
DB0
29
41
O
D0 (LSB)
0
D0 (LSB)
CONTROL PINS
CS
42
6
I
Chip select. Active low signal enables chip operation like acquisition start, conver-
sion start, bus release from 3-state. Refer to the timing diagrams for more details.
CONVST
40
4
I
Conversion start. The rising edge starts the acquisition. The falling edge of this input
ends the acquisition and starts the conversion. Refer to the timing diagrams for more
details.
RD
41
5
I
Active low synchronization pulse for the parallel output. When CS is low, this serves
as the output enable and puts the previous conversion results on the bus.
A_PWD
37
1
I
Nap mode enable, active low
PWD/RST
38
2
I
Active low input, acts as device power down/device reset signal.
BYTE
39
3
I
Byte select input. Used for 8-bit bus reading.
0: No fold back
1: Lower byte D[3:0] is folded back to high byte so D3 is available in D11 place.
STATUS OUTPUT
BUSY
36
48
O
Status output. High when a conversion is in progress.
POWER SUPPLY
+VBD
24, 34
36, 46
Digital power supply for all digital inputs and outputs. Refer to Table 3 for layout
guidelines.
BDGND
25, 35
37, 47
Digital ground for all digital inputs and outputs. Short to analog ground plane below
the device.
+VA
4, 9, 10, 13,
43, 46
7, 10, 16,
21, 22, 25
Analog power supplies. Refer to Table 3 for layout guidelines.
AGND
5, 8, 11, 12,
14, 15, 44, 45
8, 9, 17,
20, 23, 24,
26, 27
Analog ground pins. Short to analog ground plane below the device.
ANALOG INPUT
+IN
6
18
I
Noninverting analog input channel
−IN
7
19
I
Inverting analog input channel
REFIN
1
13
I
Reference (positive) input. Needs to be decoupled with REFM pin using 0.1-
µF by-
pass capacitor and 1-
µF storage capacitor.
REFOUT
2
14
O
Internal reference output. To be shorted to REFIN pin when internal reference is used.
Do not connect to REFIN pin when external reference is used. Always needs to be
decoupled with AGND using 0.1-
µF bypass capacitor.
REFM
47, 48
11, 12
I
Reference ground. Connect to analog ground plane.
NC
3, 30, 31, 32,
33
15, 42, 43,
44, 45
No connection


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