ADS7810
SBAS014A –MARCH 1992–REVISED SEPTEMBER 2010
www.ti.com
APPLICATION INFORMATION
The ADS7810 will begin tracking the input signal at
the end of the conversion. Allowing 1.25ms between
convert commands assures accurate acquisition of a
new signal. Refer to Table 1 for a summary of CS,
R/C, and BUSY states, and Figure 1 and Figure 2 for
timing parameters.
BASIC OPERATION
Figure 14 shows a basic circuit to operate the
ADS7810. Taking R/C (pin 23) low for a minimum of
40ns will initiate a conversion. BUSY (pin 25) will go
low and stay low until the conversion is completed
and the output registers are updated. Data will be
output in binary twos complement with the MSB on
D11 (pin 6). BUSY going high can be used to latch
the data. All convert commands will be ignored while
BUSY is low.
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 it is critical that CS or
R/C initiate the conversion, be sure the less critical
input is low at least 10ns prior to the initiating input.
The ADS7810 will begin tracking the input signal at
the end of the conversion. Allowing 1.25ms between
convert commands assures accurate acquisition of a
new signal.
To reduce the number of control pins, CS can be tied
low using R/C to control the read and convert modes.
Note that the parallel output will be active whenever
R/C is HIGH and no conversion is in progress. See
the Reading Data section and refer to Table 1 for
control line functions for ‘read’ and ‘convert’ modes.
STARTING A CONVERSION
The combination of CS (pin 24) and R/C (pin 23) low
for a minimum of 40ns puts the sample/hold of the
ADS7810 in the hold state and starts a conversion.
BUSY (pin 25) will go low and stay low until the
conversion is completed and the internal output
register has been updated. All new convert
commands during BUSY low will be ignored.
1.±mF ±1mF
+
+50
+
51W
±
2
28
±±10
27
1.±mF ±1mF
-50
3
26
+
+
4
25
+
BUSY
1.±mF
±1mF
5
24
Convert Pulse
D±± (MSB)
6
23
7
22
D±1
D9
D8
D7
D6
D5
D4
ADS7810
8
2±
41ns min
9
21
±1
±±
±2
±3
±4
±9 NC
±8
D1 (LSB)
D±
±7
±6
D2
±5
D3
Figure 14. Basic Operation
10
Submit Documentation Feedback
Copyright © 1992–2010, Texas Instruments Incorporated
Product Folder Link(s): ADS7810
TI [ TEXAS INSTRUMENTS ]
