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參數(shù)資料
| 型號： | MAX1497EAI |
| 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 and レC Interface |
| 中文描述： | 1-CH PROPRIETARY METHOD ADC, PDSO28 |
| 封裝： | 5.30 MM, MO-150, SSOP-28 |
| 文件頁數(shù)： | 27/33頁 |
| 文件大?。?/td> | 665K |
| 代理商： | MAX1497EAI |
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The transfer function for the MAX1499 with AIN+ - AIN-
< 0, RANGE = 0 is:
The transfer function for the MAX1497 with AIN+ - AIN-
≥
0, RANGE = 0 is:
The transfer function for the MAX1497 with AIN+ - AIN-
< 0, RANGE = 0 is:
V
V
REF
The transfer function for the MAX1499 with AIN+ - AIN-
≥
0, RANGE = 1 is:
V
V
REF
+
The transfer function for the MAX1499 with AIN+ - AIN-
< 0, RANGE = 1 is:
The transfer function for the MAX1497 with AIN+ - AIN-
≥
0, RANGE = 1 is:
V
V
REF
The transfer function for the MAX1497 with AIN+ - AIN-
< 0, RANGE = 1 is:
Supplies, Layout, and Bypassing
Power up AVDD and DVDD (MAX1499) and VDD
(MAX1497) before applying an analog input and exter-
nal reference voltage to the device. If this is not possi-
ble, limit the current into these inputs to 50mA. When
the analog and digital supplies come from the same
source, isolate the digital supply from the analog sup-
ply with a low-value resistor (10
) or ferrite bead. For
best performance, ground the MAX1497/MAX1499 to
the analog ground plane of the circuit board.
Avoid running digital lines under the device, because
they may couple noise onto the die. Run the analog
ground plane under the MAX1497/MAX1499 to mini-
mize coupling of digital noise. Make the power-supply
lines to the MAX1497/MAX1499 as wide as possible to
provide low-impedance paths and reduce the effects of
glitches on the power-supply line.
Shield fast-switching signals, such as clocks, with digital
ground to avoid radiating noise to other sections of the
board. Avoid running clock signals near the analog
inputs. Avoid crossover of digital and analog signals.
Running traces that are on opposite sides of the board at
right angles to each other reduces feedthrough effects.
A microstrip technique is best, but is not always possible
with double-sided boards. With this technique, the com-
ponent side of the board is dedicated to ground planes
while signals are placed on the solder side.
Good decoupling is important when using high-resolution
ADCs. Decouple the supplies with 0.1μF ceramic capaci-
tors to GND. Place these components as close to the
device as possible to achieve the best decoupling.
Segment-Current Selection
A resistor from ISET to ground sets the current for each
LED segment. See Table 6 for more detail. Use the fol-
lowing formula to set the segment current:
R
ISET
values below 25k
increase the I
SEG
. However,
the internal current-limit circuit limits the I
SEG
to less than
30mA. At higher I
SEG
values, the proper operation of the
device is not guaranteed. In addition, the power dissipat-
ed may exceed the package power dissipation limit.
I
V
R
SEG
ISET
=
×
1 25
.
400
COUNTS
V
V
V
V
AIN
REF
AIN
REF
1 024
×
×
+
=
+
+
2000
10
1
COUNTS
V
V
AIN
AIN
REF
1 024
×
×
=
+
+
2000
10
COUNTS
V
V
V
V
AIN
REF
AIN
REF
1 024
×
,
×
+
=
+
+
20 000
10
1
COUNTS
V
V
AIN
AIN
REF
1 024
,
×
=
×
+
20 000
10
COUNTS
V
V
AIN
AIN
REF
1 024
=
×
+
+
+
2000
1
COUNTS
V
V
V
V
AIN
AIN
REF
REF
1 024
=
×
+
+
2000
COUNTS
V
V
V
V
AIN
REF
AIN
REF
1 024
×
,
+
=
+
+
20 000
1
M
3.5- and 4.5-Digit, Single-Chip ADCs with LED
Drivers and μC Interface
______________________________________________________________________________________
27
R
ISET
(k
)
25
50
100
500
>2500
I
SEG
(mA)
20
10
5
1
LED driver disabled
Table 6. Segment Current Selection
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1499ECJ | 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers and レC Interface |
| MAX15004 | 4.5V to 40V Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers |
| MAX15004AAUE | 4.5V to 40V Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers |
| MAX15004BAUE | 4.5V to 40V Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers |
| MAX15005 | 4.5V to 40V Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1497EAI+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 3.5 Digit 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 |
| MAX1497EAI+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 3.5 Digit 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 |
| MAX1497EAI-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 |
| MAX1497EPI | 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 |
| MAX1497EPI+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 3.5 Digit 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 |
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