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參數(shù)資料
| 型號(hào)： | MAX1462 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Voltage, Low-Power, 16-Bit Smart ADC |
| 中文描述： | 低電壓、低功耗、16位智能ADC |
| 文件頁(yè)數(shù)： | 7/16頁(yè) |
| 文件大?。?/td> | 242K |
| 代理商： | MAX1462 |
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M
Low-Voltage, Low-Power,
16-Bit Smart ADC
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7
The MAX1462 includes an internal temperature-sensing
bridge allowing the MAX1462 temperature to be used
as a proxy for the sensor temperature. For this reason,
the MAX1462 must be mounted in thermal proximity to
the sensor. The output of the temperature-sensing
bridge is also corrected by a 3-bit coarse-offset DAC
and processed by the ADC. The selection of the tem-
perature sensor offset (TSO) bits in the configuration
register should be made so that the digitized tempera-
ture signal is as close to 0.0 as possible at midscale
temperature. This is done to maximize the dynamic
range of the thermal-calibration coefficients (Table 3).
Test-System Interface: Writing Calibration
Coefficients to the DSP Registers
and EEPROM
To make the MAX1462 respond to commands from the
test system, raise the TEST pin and drive XIN with a
–MAKE A TEST SYSTEM VARIABLE CALLED “NoMoreGain.”
–SET THE TEMPERATURE TO WHERE THE SENSOR’S SENSITIVITY IS HIGHEST. THIS IS NORMALLY COLD FOR SILICON PRTs.
–SET THE PGA GAIN SETTINGS TO MINIMUM.
–CLEAR THE VARIABLE “NoMoreGain.”
–APPLY MAXIMUM SENSOR EXCITATION.
–TEST FOR CLIPPING (DIGITIZED SIGNAL > 0.85).
RECORD THE PGA AND COARSE OFFSET SETTINGS.
CAUTION:
CLIPPING IS STILL POSSIBLE FOR LARGE SENSOR’S OFFSET TC AND LARGE TEMPERATURE RANGES.
IF NECESSARY, GUARD BAND AGAINST CLIPPING BY REDUCING THE
±
0.85 CLIPPING CONSTANTS ABOVE.
–APPLY MIDSCALE EXCITATION TO THE SENSOR.
–FIND THE COARSE OFFSET DAC SETTING WHERE THE DIGITIZED SIGNAL REGISTER IS CLOSEST TO ZERO (MIDSCALE).
–REDUCE THE PGA GAIN ONE STEP.
–SET THE VARIABLE “NoMoreGain.”
INCREASE THE PGA GAIN ONE STEP.
DID ADC CLIP
IS THE PGA AT
MINIMUM GAIN
THE SENSOR SENSITIVITY
IS TOO LARGE. ADD A
RESISTOR BETWEEN THE
TOP OF THE BRIDGE
AND V
DD
, THEN
START OVER.
YES
YES
SERIES
RESISTOR
SENSOR
NO
YES
YES
NO
NO
NO
–APPLY MINIMUM SENSOR EXCITATION.
–TEST FOR CLIPPING (DIGITIZED SIGNAL < -0.85).
V
DD
IS THE PGA AT
MAXIMUM GAIN
IS “NoMoreGain” SET
Figure 1. Flowchart for Determining PGA and CO Settings
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