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ADS7820UB Datasheet(PDF) 6 Page - Texas Instruments

No. de pieza ADS7820UB
Descripción Electrónicos  ANALOG-to-DIGITAL CONVERTER
Download  11 Pages
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

ADS7820UB Datasheet(HTML) 6 Page - Texas Instruments

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6
®
ADS7820
BASIC OPERATION
Figure 1 shows a basic circuit to operate the ADS7820 with
a full parallel data output. Taking R/C (pin 24) LOW for a
minimum of 40ns (5.4
µs max) will initiate a conversion.
BUSY (pin 26) will go LOW and stay LOW until the
conversion is completed and the output registers are up-
dated. Data will be output in Straight Binary with the MSB
on pin 6. BUSY going HIGH can be used to latch the data.
All convert commands will be ignored while BUSY is
LOW.
The ADS7820 will begin tracking the input signal at the end
of the conversion. Allowing 10
µs between convert com-
mands assures accurate acquisition of a new signal.
STARTING A CONVERSION
The combination of CS (pin 25) and R/C (pin 24) LOW for
a minimum of 40ns immediately puts the sample/hold of the
ADS7820 in the hold state and starts conversion ‘n’. BUSY
(pin 26) will go LOW and stay LOW until conversion ‘n’ is
completed and the internal output register has been updated.
All new convert commands during BUSY LOW will be
ignored. CS and/or R/C must go HIGH before BUSY goes
HIGH or a new conversion will be initiated without suffi-
cient time to acquire a new signal.
The ADS7820 will begin tracking the input signal at the end
of the conversion. Allowing 10
µs between convert com-
mands assures accurate acquisition of a new signal. Refer to
Table I for a summary of CS, R/C, and BUSY states and
Figures 3 through 5 for timing diagrams.
CS and R/C are internally OR’d and level triggered. There
is not a requirement which input goes LOW first when
initiating a conversion. If, however, it is critical that CS or
R/C initiates conversion ‘n’, be sure the less critical input is
LOW at least 10ns prior to the initiating input.
To reduce the number of control pins, CS can be tied LOW
using R/C to control the read and convert modes. However,
the output will become active whenever R/C goes HIGH.
Refer to the Reading Data section.
FIGURE 1. Basic Operation (Byte Low).
CS
R/C
BUSY
OPERATION
1
X
X
None. Databus is in Hi-Z state.
0
1
Initiates conversion “n”. Databus remains
in Hi-Z state.
0
1
Initiates conversion “n”. Databus enters Hi-Z
state.
01
Conversion “n” completed. Valid data from
conversion “n” on the databus.
1
1
Enables databus with valid data from
conversion “n”.
1
0
Enables databus with valid data from
conversion “n-1”(1). Conversion n in process.
0
0
Enables databus with valid data from
conversion “n-1”(1). Conversion “n” in process.
00
New conversion initiated without acquisition
of a new signal. Data will be invalid. CS and/or
R/C must be HIGH when BUSY goes HIGH.
X
X
0
New convert commands ignored. Conversion
“n” in process.
NOTE: (1) See Figures 2 and 3 for constraints on data valid from
conversion “n-1”.
Table I. Control Line Functions for “Read” and “Convert”.
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
ADS7820
0 to +5V
+5V
0.1µF
10µF
+
+
2.2µF
+
+
2.2µF
Convert Pulse
40ns min
5.4µs max
B0 (LSB)
B1
B2
B3
LOW
LOW
LOW
LOW
B6
B5
B4
B7
B8
B9
B10
B11 (MSB)


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