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ADS8504IBDWRG4 View Datasheet(PDF) - Burr-Brown -> Texas Instruments

Part NameDescriptionManufacturer
ADS8504IBDWRG4 12-BIT 250-KSPS SAMPLING CMOS ANALOG-TO-DIGITAL CONVERTER BB
Burr-Brown -> Texas Instruments BB
ADS8504IBDWRG4 Datasheet PDF : 19 Pages
First Prev 11 12 13 14 15 16 17 18 19
ADS8504
www.ti.com
APPLICATION INFORMATION
SLAS434 – JUNE 2005
CALIBRATION
The ADS8504 can be trimmed in hardware or software. The offset should be trimmed before the gain since the
offset directly affects the gain. To achieve optimum performance, several iterations may be required.
Hardware Calibration
To calibrate the offset and gain of the ADS8504, install the proper resistors and potentiometers as shown in
Figure 23(a).
Software Calibration
To calibrate the offset and gain of the ADS8504 in software, no external resistors are required. See the No
Calibration section for details on the effects of the external resistors. Refer to Table 4 for range of offset and gain
errors with and without external resistors.
No Calibration
See Figure 23(b) for circuit connections. The external resistors shown in Figure 23(b) may not be necessary in
some applications. These resistors provide compensation for an internal adjustment of the offset and gain which
allows calibration with a single supply. Refer to Table 4 for range of offset and gain errors with and without
external resistors.
Table 4. Typical Offset (Bipolar Zero Error, BPZ) and Gain Errors With and Without External Resistors
BPZ
+Full scale
Gain error
–Full scale
WITH EXTERNAL RESISTORS
-4.88 < BPZ < 4.88
-1 < BPZ < 1
-0.25 < Error < 0.25
-0.25 < Error < 0.25
WITHOUT EXTERNAL RESISTORS
-56.6 < BPZ < -32.2
-11.6 < BPZ < -6.6
-2.5 < Error < -1.25
-3.5 < Error < -2.25
UNITS
mV
LSBs
% of FSR
±10 V
200
1
VIN
33.2 k
+5 V
2.2 µF +
Offset
50 k
50 k576 k
Gain
+
2.2 µF
2 AGND1
3
REF
4 CAP
5 AGND2
±10 V
33.2 k
200
1
VIN
2.2 µF +
2
AGND1
3
REF
+
2.2 µF
4 CAP
5 AGND2
(a) ±10 V With Hardware Trim
(b) ±10 V Without Hardware Trim
Note: Use 1% metal film resistors.
Figure 23. Circuit Diagram With and Without External Trim Hardware
REFERENCE
The ADS8504 can operate with its internal 2.5-V reference or an external reference. By applying an external
reference to pin 5, the internal reference can be bypassed. The reference voltage at REF is buffered internally
with the output on CAP (pin 4).
The internal reference has an 8 ppm/°C drift (typical) and accounts for approximately 20% of the full-scale error
(FSE = ±0.5%).
13
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