參數(shù)資料
型號(hào)： MAX1496EPI
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： ADC
英文描述： 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers
中文描述： 1-CH PROPRIETARY METHOD ADC, PDIP28
封裝： 0.600 MM, PLASTIC, MS-011, DIP-28
文件頁(yè)數(shù)： 16/24頁(yè)
文件大?。?/td> 907K
代理商： MAX1496EPI
M
3.5- and 4.5-Digit, Single-Chip ADCs
with LED Drivers
16
______________________________________________________________________________________
Hold
The MAX1447/MAX1496/MAX1498 feature data-hold
circuitry. When activated (HOLD is set to AV
DD
for the
MAX1447/MAX1498 or to V
DD
for the MAX1496), the
device holds the current reading on the LED.
Strain-Gauge Measurement
Connect the differential inputs of the MAX1447/
MAX1496/MAX1498 to the bridge network of the strain
gauge. In Figure 8, the analog supply voltage powers
the bridge network and the MAX1447/MAX1496/
MAX1498, along with the reference voltage. The
MAX1447/MAX1496/MAX1498 handle an analog input
voltage range of ±200mV and ±2V full scale. The ana-
log/reference inputs of the parts allow the analog input
range to have an absolute value of anywhere between
-2.2V and +2.2V.
Thermocouple Measurement
Figure 9 shows a connection from a thermocouple to
the MAX1447/MAX1496/MAX1498. In this application,
the MAX1447/MAX1496/MAX1498 take advantage of
the on-chip input buffers that allow large source imped-
ances on the front end. The decoupling capacitors
reduce noise pickup from the thermocouple leads. To
place the differential voltage from the thermocouple at
a suitable common-mode voltage, the AIN- input of the
MAX1447/MAX1496/MAX1498 is biased to GND. Use
an external temperature sensor, such as the DS75, and
a microcontroller to perform cold-junction temperature
compensation.
Transfer Functions
Figures 10–13 show the transfer functions of the
MAX1447/MAX1496/MAX1498.
The transfer function for the MAX1447/MAX1498 with
AIN+ - AIN-
≥
0, RANGE = GND is:
The transfer function for the MAX1447/MAX1498 with
AIN+ - AIN- < 0, RANGE = GND is:
The transfer function for the MAX1447/MAX1498 with
AIN+ - AIN-
≥
0, RANGE = DV
DD
is:
The transfer function for the MAX1447/MAX1498 with
AIN+ - AIN- < 0, RANGE = DV
DD
is:
COUNT
V
V
V
V
AIN
REF
AIN
REF
1 024
,
+
=
×
×
+
+
20 000
10
1
COUNT
V
V
V
V
AIN
REF
AIN
REF
1 024
,
×
=
×
+
+
20 000
10
COUNT
V
V
V
V
AIN
REF
AIN
REF
1 024
×
,
+
=
+
+
20 000
1
COUNT
V
V
V
V
AIN
REF
AIN
REF
1 024
,
=
×
+
+
20 000
-2V
0
ANALOG INPUT VOLTAGE
+2V
-100
μ
V
100
μ
V
LED
1 - - - -
19,999
2
1
0
- 0
- 1
- 2
-19,999
- 1 - - - -
Figure 10. MAX1447/MAX1498 Transfer Function, ±2V Range
-200mV
0
ANALOG INPUT VOLTAGE
+200mV
-10
μ
V
10
μ
V
LED
1 - - - -
19,999
2
1
0
- 0
- 1
- 2
-19,999
- 1 - - - -
Figure 11. MAX1447/MAX1498 Transfer Function, ±200mV Range
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