product data sheet. All of the major functions of the
鈭單?/div>
A/D converter are discussed in detail in these manuals. This
application note has been written at the request of many first
time users who have a problem with connecting the con-
verter in a basic circuit and establishing communication. Not
all of the problems that could come up are in this note,
however the most frequent problems are discussed with
viable solutions.
# DIFFERENTIAL
INPUT
CHANNELS
1
1
SELECTING THE RIGHT CONVERTER
FOR THE APPLICATION
Prior to putting a chip in your circuit, the right converter
should be selected for the application. The six products,
ADS1210, ADS1211, ADS1212, ADS1213, ADS1214 and
ADS1215 functionality are organized in an easy to remem-
ber fashion. For instance, the converters come in pairs where
one of the two has a single differential input and the other
has a four channel, multiplexed differential input front end.
In the case of the single differential input ADS1210, the
multiplexed quad differential input version is the ADS1211.
In an effort to simplify this discussion, the ADS1210 and
ADS1211 will be called the ADS1210/11. The numbering
system follows where the ADS1212 and ADS1213
(ADS1212/13) have a similar relationship as well as the
ADS1214 and ADS1215 (ADS1214/15). All of these input
configuration relationships are shown in Table I.
The ADS1210/11 pair is the higher speed, more accurate
version as compared to the ADS1212/13. All four of these
devices have voltage references that can be used to bias
external circuits. The third pair, ADS1214/15 are similar to
# BITS
NMC
(1)
ADS1210
24
INPUT VOLTAGE
RANGE
0V - 5V
or
10Vp-p
0V - 5V
or
10Vp-p
0V - 5V
or
10Vp-p
0V - 5V
or
10Vp-p
0V - 320mV
or
640mVp-p
0V - 320mV
or
640mVp-p
ON CHIP
REFERENCE
2.5V
and
3.3V
2.5V
and
3.3V
2.5V
and
3.3V
2.5V
and
3.3V
Two
200碌A(chǔ)
Sources
Two
200碌A(chǔ)
Sources
MINIMUM
PROGRAMMABLE
DATA RATE
2.4Hz
MAXIMUM
PROGRAMMABLE
DATA RATE
15,625Hz
COMMENTS
Capable of Higher
speeds, up to 20 bits
at 1000Hz
Capable of Higher
speeds, up to 20 bits
at 1000Hz
Low Power
Version of
ADS1210
Low Power
Version of
ADS1211
Input Range
Appropriate for Direct
Connection to Sensors
Input Range
Appropriate for Direct
Connection to Sensors
ADS1211
24
4
2.4Hz
15,625Hz
ADS1212
20
1
0.96Hz
6,250Hz
ADS1213
20
4
0.96Hz
6,250Hz
ADS1214
20
1
0.96Hz
6,250Hz
ADS1215
20
4
0.96Hz
6,250Hz
NOTE: (1) NMC = No Missing Codes.
TABLE I. The ADS1210, ADS1211, ADS1212, ADS1213, ADS1214, and ADS1215 are all
鈭單?/div>
analog-to-digital converters.
The input stages of these devices vary in voltage range and number of differential channels. On the other hand, the
digital portion of these circuits have the same fundamental operation and architecture.
漏
1997 Burr-Brown Corporation
AB-119
1
Printed in U.S.A. August, 1997
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