Datasheet
ANALOG INPUT
OPA627
GND
GND
GND
GND
Pin1
Pin 7
−
Pin 2
+
Pin3
Pin4
Pin 6
−15V
+15 V
2.2mF
100nF
2kW
22pF
2kW
22pF
2.2mF
2.2mF
100nF
2.2mF
R1
IN
GND
R2
IN
R3
IN
CAP
REF
ADS8513
OPA132
or
GND
V
IN
ADS8513
SLAS486C – JUNE 2007 – REVISED JANUARY 2009 ......................................................................................................................................................
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The ADS8513 offers a number of input ranges. This set of options is accomplished by connecting the three input
resistors to either the analog input (V
IN
), to ground (GND), or to the 2.5V reference buffer output (BUF). Table 1
shows the input ranges that are typically used in most data acquisition applications. These ranges are all
specified to meet the specifications given in the Electrical Characteristics table. Table 4 contains a complete list
of ideal input ranges, associated input connections, and comments regarding the range.
Table 4. Complete list of Ideal Input Ranges
ANALOG CONNECT CONNECT CONNECT INPUT
INPUT R1
IN
R2
IN
R3
IN
IMPEDANCE
RANGE (V) TO TO TO (k Ω ) COMMENT
0.3125 to 2.8125 V
IN
V
IN
V
IN
> 10,000 Specified offset and gain
– 0.417 to 2.916 V
IN
V
IN
BUF 26.7 V
IN
cannot go below GND – 0.3V
0.417 to 3.750 V
IN
V
IN
GND 26.7 Offset and gain not specified
± 3.333 V
IN
BUF V
IN
21.3 Specified offset and gain
– 15 to 5 V
IN
BUF BUF 45.7 Offset and gain not specified
± 10 V
IN
BUF GND 45.7 Specified offset and gain
0.833 to 7.5 V
IN
GND V
IN
21.3 Offset and gain not specified
– 2.5 to 17.5 V
IN
GND BUF 45.7 Exceeds absolute maximum V
IN
2.5 to 22.5 V
IN
GND GND 45.7 Exceeds absolute maximum V
IN
0 to 2.857 BUF V
IN
V
IN
45.7 Offset and gain not specified
– 1 to 3 BUF V
IN
BUF 21.3 V
IN
cannot go below GND – 0.3V
0 to 4 BUF V
IN
GND 21.3 Specified offset and gain
– 6.25 to 3.75 BUF BUF V
IN
26.7 Offset and gain not specified
0 to 10 BUF GND V
IN
26.7 Specified offset and gain
0.357 to 3.214 GND V
IN
V
IN
45.7 Offset and gain not specified
– 0.5 to 3.5 GND V
IN
BUF 21.3 V
IN
cannot go below GND – 0.3V
0.5 to 4.5 GND V
IN
GND 21.3 Specified offset and gain
± 5 GND BUF V
IN
26.7 Specified offset and gain
1.25 to 11.25 GND GND V
IN
26.7 Offset and gain not specified
Figure 44. Typical Driving Circuit ( ± 10V, No Trim)
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