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参数资料
| 型号： | MAX1491CAI+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 17/25页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3.5 DGT LCD DVR 28-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 46 |
| 显示器类型： | LCD |
| 配置： | 7 段 + 2 个信号器 |
| 数字或字符： | A/D，3.5 位数字 |
| 电流 - 电源： | 980µA |
| 电源电压： | 2.7 V ~ 5.25 V |
| 工作温度： | 0°C ~ 70°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： | 管件 |
| 产品目录页面： | 1397 (CN2011-ZH PDF) |
3.5- and 4.5-Digit, Single-Chip
ADCs with LCD Drivers
If ghosting is present on the LCD, the RMS OFF voltage
is too high. Choose an LCD with a higher RMS OFF
voltage or decrease DV DD .
Decimal Point Control
The MAX1491/MAX1493/MAX1495 allow for full deci-
mal-point control and feature leading-zero suppression.
Use DPON, DPSET1, and DPSET2 to set the value of
the decimal point. Tables 2 and 3 show the truth tables
of the DPON, DPSET1, and DPSET2 that determine
which decimal point is used.
Reference
The MAX1491/MAX1493/MAX1495 reference sets the
full-scale range of the ADC transfer function. With a
nominal 2.048V reference, the ADC full-scale range is
±2V with RANGE equal to GND. With RANGE equal to
DV DD , the full-scale range is ±200mV. A decreased ref-
erence voltage decreases full-scale range (see the
Transfer Functions section).
The MAX1491/MAX1493/MAX1495 accept either an
external reference or an internal reference. The INTREF
input selects the reference mode.
For internal reference operation, connect INTREF to
DV DD , connect REF- to GND, and bypass REF+ to
GND with a 4.7μF capacitor. The internal reference pro-
vides a nominal 2.048V source between REF+ and
GND. The internal reference temperature coefficient is
typically 40ppm/°C.
Connect INTREF to GND to use the external reference.
The external reference inputs, REF+ and REF-, are fully
differential. For a valid external reference input, V REF+
must be greater than V REF- . Bypass REF+ and REF-
with a 0.1μF or greater capacitor to GND in external ref-
erence mode.
Figure 13 shows the MAX1493/MAX1495 operating with
an external differential reference. In this mode, REF- is
connected to the top of the strain gauge and REF+ is
connected to the midpoint of the resistor-divider on the
supply.
Applications Information
Power-On
At power-on, the digital filter and modulator circuits
reset. The MAX1493/MAX1495 allow 6s for the refer-
ence to stabilize before performing enhanced offset
calibration. During these 6s, the MAX1493/MAX1495
display 1.2V to 1.5V when a stable reference is detect-
ed. If a valid reference is not found, the MAX1493/
MAX1495 time out after 6s and begin enhanced offset
calibration. Enhanced offset calibration typically lasts
2s. The MAX1493/MAX1495 begin converting after
enhanced offset calibration.
Offset Calibration
The MAX1491/MAX1493/MAX1495 offer on-chip offset
calibration. The MAX1491/MAX1493/MAX1495 calibrate
offset during every conversion cycle. The MAX1495
Table 2. Decimal-Point Control Table (MAX1493/MAX1495)
DPON
0
0
0
0
1
1
1
1
DPSET1
0
0
1
1
0
0
1
1
DPSET2
0
1
0
1
0
1
0
1
DISPLAY OUTPUT
18888
18888
18888
18888
1 8 8 8.8
1 8 8.8 8
1 8.8 8 8
1.8 8 8 8
ZERO INPUT READING
0
0
0
0
0.0
0.00
0.000
0.0000
Table 3. Decimal-Point Control Table (MAX1491)
DPSET1
0
0
1
1
DPSET2
0
1
0
1
DISPLAY OUTPUT
1 8 8.8
1 8.8 8
1.8 8 8
1888
ZERO INPUT READING
0.0
0.00
0.000
000
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17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1491CAI+ | 功能描述:模数转换器 - ADC 3.5 Digit ADC w/LCD 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 |
| MAX1491CAI+T | 功能描述:模数转换器 - ADC 3.5 Digit ADC w/LCD 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 |
| MAX1491CAI-T | 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 |
| MAX1491CNI | 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 |
| MAX1491CNI+ | 功能描述:模数转换器 - ADC 3.5 Digit ADC w/LCD 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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