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参数资料
| 型号： | MAX1497EAI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/33页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3 1/2DIG W/LED DVR 28-SSO |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 位数： | 3.5 位 |
| 采样率（每秒）： | 5 |
| 数据接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，双极 |
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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:
The transfer function for the MAX1499 with AIN+ - AIN-
≥ 0, RANGE = 1 is:
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:
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 0.1F 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:
RISET values below 25k increase the ISEG. However,
the internal current-limit circuit limits the ISEG to less than
30mA. At higher ISEG 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
=
×
125
400
.
COUNTS
VV
AIN
REF
.
=×
×+
+
1 024
2000
10
1
COUNTS
VV
AIN
REF
.
=×
×
+
+
1 024
2000
10
COUNTS
VV
AIN
REF
.
,
=×
×+
+
1 024
20 000
10
1
COUNTS
VV
AIN
REF
.
,
=
××
+
1 024
20 000
10
COUNTS
VV
AIN
REF
.
=×
+
+
1 024
2000
1
COUNTS
VV
AIN
REF
.
=×
+
+
1 024
2000
COUNTS
VV
AIN
REF
.
,
=×
+
+
1 024
20 000
1
MAX1497/MAX1499
3.5- and 4.5-Digit, Single-Chip ADCs with LED
Drivers and C Interface
______________________________________________________________________________________
27
RISET (k)ISEG (mA)
25
20
50
10
100
5
500
1
>2500
LED driver disabled
Table 6. Segment Current Selection
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1497EPI | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX1497EPI+ | 功能描述:模数转换器 - ADC 3.5 Digit ADC w/LED Drivers RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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