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參數(shù)資料
| 型號： | MAX1447ECJ+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 4 1/2DIG W/LED DVR 32TQFP |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,000 |
| 位數(shù)： | 4.5 位 |
| 采樣率（每秒）： | 50 |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉換器數(shù)目： | 1 |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-TQFP |
| 供應商設備封裝： | 32-TQFP（5x5） |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個差分，雙極 |
MAX1447/MAX1496/MAX1498
3.5- and 4.5-Digit, Single-Chip ADCs
with LED Drivers
______________________________________________________________________________________
15
For external-reference operation, set INTREF to GND.
REF+ and REF- are fully differential. For a valid exter-
nal-reference input, VREF+ must be greater than VREF-.
Bypass REF+ and REF- with a 0.1F or greater capaci-
tor to GND in external-reference mode.
Figure 8 shows the MAX1447/MAX1496/MAX1498 oper-
ating with an external differential reference. In this fig-
ure, REF- is connected to the top of the strain gauge
and REF+ is connected to the midpoint of the resistor-
divider of the supply.
Figure 9 shows the MAX1447/MAX1496/MAX1498 oper-
ating with an external single-ended reference. In this
figure, REF- is connected to GND and REF+ is driven
with an external 2.048V reference. Bypass REF+ to
GND with a 0.47F capacitor.
Applications Information
Power-On Reset
At power-up, the digital filter and modulator circuits reset.
The MAX1447/MAX1498 allows 6s for the reference to
stabilize before performing enhanced offset calibration.
During these 6s, the MAX1447/MAX1498 display 1.2V
to 1.5V when a stable reference is detected. If a valid
reference is not found, the MAX1447/MAX1498 time out
after 6s and begin enhanced offset calibration.
Enhanced offset calibration typically lasts 2s. The
MAX1447/MAX1498 begin converting after enhanced
offset calibration.
Offset Calibration
The MAX1447/MAX1496/MAX1498 offer on-chip offset
calibration. The device offset calibrates during every con-
version cycle.
Enhanced Offset Calibration
(MAX1447 Only)
Enhanced offset calibration is a more accurate calibra-
tion method that is needed in the case of the ±200mV
range and 4.5-digit resolution. In addition to enhanced
offset calibration at power-up, the MAX1447 performs
enhanced calibration on demand by connecting HOLD
to AVDD for > 2s.
Peak
The MAX1447/MAX1496/MAX1498 feature peak-detec-
tion circuitry. When activated (PEAK connected to
AVDD for the MAX1498/MAX1447 or to VDD for the
MAX1496), the devices display only the highest voltage
measured to the LED.
First, the current ADC result is displayed. The new ADC
conversion result is compared to the current result. If the
new value is larger than the previous peak value, the
new value is displayed. If the new value is less than the
previous peak value, the display remains unchanged.
Connect PEAK to GND to clear the peak value and dis-
able the peak function.
Figure 9. Thermocouple Application with the MAX1447/MAX1496/
MAX1498
Figure 8. Strain-Gauge Application with the MAX1447/MAX1496/
MAX1498
MAX1447
MAX1496
MAX1498
AVDD
DVDD
4.7
F
0.1
F
0.1
F
0.1
F
0.1
F
0.1
F
ANALOG SUPPLY
FERRITE
BEAD
RREF
R
ACTIVE
GAUGE
DUMMY
GAUGE
REF+
REF-
AIN+
AIN-
GND
4.7
F
0.1
F
MAX1447
MAX1496
MAX1498
MAX6062
+5V
+2.048V
THERMOCOUPLE
JUNCTION
0.1
F
0.47
F
AIN+
AIN-
REF+
REF-
GND
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