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參數(shù)資料
| 型號： | MAX1447 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 1C Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction 16-SSOP/QSOP -40 to 125 |
| 中文描述： | 3位半和4位半、單片ADC，帶有LED驅(qū)動器 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 907K |
| 代理商： | MAX1447 |
M
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, V
REF+
must be greater than V
REF-
.
Bypass REF+ and REF- with a 0.1μF 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 0.47μF 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 AV
DD
for > 2s.
Peak
The MAX1447/MAX1496/MAX1498 feature peak-detec-
tion circuitry. When activated (PEAK connected to
AV
DD
for the MAX1498/MAX1447 or to V
DD
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
AV
DD
DV
DD
4.7
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
ANALOG SUPPLY
FERRITE
BEAD
R
REF
R
R
ACTIVE
GAUGE
DUMMY
GAUGE
REF+
REF-
AIN+
AIN-
GND
4.7
μ
F
0.1
μ
F
MAX1447
MAX1496
MAX1498
MAX6062
+5V
+2.048V
THERMOCOUPLE
JUNCTION
0.1
μ
F
0.47
μ
F
AIN+
AIN-
REF+
REF-
GND
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| MAX1496EAI | 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers |
| MAX1496EPI | 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers |
| MAX1498ECJ | 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers |
| MAX1447ECJ | 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers |
| MAX1449 | 1C Remote and Local TEMPERATURE SENSOR with N-Factor and Series Resistance Correction 16-SSOP/QSOP -40 to 125 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1447ECJ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1447ECJ+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 4.5-Digit 5sps ADC w/LED Drivers RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1447ECJ+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 4.5-Digit 5sps ADC w/LED Drivers RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1447ECJ-T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1448EHJ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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