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ADS7861 Datasheet(PDF) 4 Page - Texas Instruments

No. de pieza ADS7861
Descripción Electrónicos  Dual, 500kSPS, 12-Bit, 2 2 Channel Simultaneous Sampling ANALOG-TO-DIGITAL CONVERTER
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

ADS7861 Datasheet(HTML) 4 Page - Texas Instruments

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ADS7861
4
SBAS110D
DGND
CH B1+
CH B1–
CH B0+
CH B0–
CH A1+
CH A1–
CH A0+
CH A0–
REF
IN
REF
OUT
AGND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
+V
D
SERIAL DATA A
SERIAL DATA B
BUSY
CLOCK
CS
RD
CONVST
A0
M0
M1
+V
A
ADS7861
PIN CONFIGURATIONS
Top View
SSOP
Top View
QFN
SSOP
QFN
PIN
PIN
NAME
DESCRIPTION
1
28
DGND
Digital Ground. Connect directly to analog ground (pin 12).
2
1
CH B1+
Noninverting Input Channel B1
3
2
CH B1–
Inverting Input Channel B1
4
3
CH B0+
Noninverting Input Channel B0
5
4
CH B0–
Inverting Input Channel B0
6
5
CH A1+
Noninverting Input Channel A1
7
6
CH A1–
Inverting Input Channel A1
8
7
CH A0+
Noninverting Input Channel A0
9
8
CH A0–
Inverting Input Channel A0
10
9
REFIN
Reference Input
11
10
REFOUT
2.5V Reference Output
12
12
AGND
Analog Ground. Connect directly to digital ground (pin 1).
13
13
+VA
Analog Power Supply, +5VDC. Connect directly to digital power supply (pin 24). Decouple to analog ground with a 0.1
µF ceramic capacitor
and a 10
µF tantalum capacitor.
14
16
M1
Selects between the Serial Outputs. When M1 is LOW, both Serial Output A and Serial Output B are selected for data transfer. When M1
is HIGH, Serial output A is configured for both Channel A data and Channel B data; Serial Output B goes into tri-state (i.e., high impedance).
15
17
M0
Selects between two-channel and four-channel operation. When M0 is LOW, two-channel operation is selected and operates in
conjunction with A0. When A0 is HIGH, Channel A1 and Channel B1 are being converted. When A0 is LOW, Channel A0 and Channel
B0 are being converted. When M0 is HIGH, four-channel operation is selected. In this mode, all four channels are converted in sequence
starting with Channels A0 and B0, followed by Channels A1 and B1.
16
18
A0
A0 operates in conjunction with M0. With M0 LOW and A0 HIGH, Channel A1 and Channel B1 are converted. With M0 LOW and A0 LOW,
Channel A0 and Channel B0 are converted.
17
19
CONVST
Convert Start. When CONVST switches from LOW to HIGH, the device switches from the sample to hold mode, independent of the status
of the external clock.
18
20
RD
Synchronization Pulse for the Serial Output.
19
21
CS
Chip Select. When LOW, the Serial Output A and Serial Output B outputs are active; when HIGH, the serial outputs are tri-stated.
20
22
CLOCK
An external CMOS-compatible clock can be applied to the CLOCK input to synchronize the conversion process to an external source.
The CLOCK pin controls the sampling rate by the equation: CLOCK = 16 • fSAMPLE.
21
23
BUSY
BUSY goes HIGH during a conversion and returns LOW after the third LSB has been transmitted on either the Serial A or Serial B output
pin.
22
24
SERIAL
The Serial Output data word is comprised of channel information and 12 bits of data. In operation, data is valid on the falling edge of
DCLOCK for 16 edges after the rising edge of RD.
23
25
SERIAL
The Serial Output data word is comprised of channel information and 12 bits of data. In operation, data is valid on the falling edge of
DCLOCK for 16 edges after the rising edge of RD. When M1 is HIGH, both Channel A data and Channel B data are available.
24
27
+VD
Digital Power Supply, +5VDC. Connect directly to pin 13. Must be
≤ +V
A.
PIN DESCRIPTIONS
DATA A
DATA B
CH B1+
CH B1
CH B0+
CH B0
CH A1+
CH A1
CH A0+
CH A0
SERIAL DATA B
BUSY
CLOCK
CS
RD
CONVST
A0
M0
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
ADS7861(1)
NOTE: (1) The thermal pad is internally connected to the substrate.
This pad can be connected to the analog ground or left floating.
Keep the thermal pad separate from the digital ground, if possible.
(2) NC = Not Connected.


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