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| 型号： | MAX197AEWI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/16页 |
| 文件大小： | 0K |
| 描述： | IC DAS 12BIT SNGL 28-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 类型： | 数据采集系统（DAS） |
| 分辨率（位）： | 12 b |
| 采样率（每秒）： | 100k |
| 数据接口： | 并联 |
| 电压电源： | 单电源 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 带卷 (TR) |
__________Applications Information
Power-On Reset
At power-up, the internal power-supply circuitry sets INT
high and puts the device in normal operation/external
clock mode. This state is selected to keep the internal
clock from loading the external clock driver when the
part is used in external clock mode.
Internal or External Reference
The MAX197 can operate with either an internal or an
external reference. An external reference can be connect-
ed to either the REF pin or to the REFADJ pin (Figure 9).
To use the REF input directly, disable the internal buffer
by tying REFADJ to VDD. Using the REFADJ input elimi-
nates the need to buffer the reference externally.
When the reference is applied at REFADJ, bypass
REFADJ with a 0.01F capacitor to AGND.
The REFADJ internal buffer gain is trimmed to 1.6384 to
provide 4.096V at the REF pin from a 2.5V reference.
Internal Reference
The internally trimmed 2.50V reference is gained
through the REFADJ buffer to provide 4.096V at REF.
Bypass the REF pin with a 4.7F capacitor to AGND
and the REFADJ pin with a 0.01F capacitor to AGND.
The internal reference voltage is adjustable to ±1.5%
(±65 LSBs) with the reference-adjust circuit of Figure 1.
External Reference
At REF and REFADJ, the input impedance is a mini-
mum of 10k
for DC currents. During conversions, an
external reference at REF must be able to deliver
400A DC load currents, and must have an output
impedance of 10
or less. If the reference has higher
input impedance or is noisy, bypass it close to the REF
pin with a 4.7F capacitor to AGND.
With an external reference voltage of less than 4.096V
at the REF pin or less than 2.5V at the REFADJ pin, the
increase in the ratio of the RMS noise to the LSB value
(FS / 4096) results in performance degradation (loss of
effective bits).
MAX197
Multi-Range (±10V, ±5V, +10V, +5V),
Single +5V, 12-Bit DAS with 8+4 Bus Interface
______________________________________________________________________________________
13
REF
10k
2.5V
26
CREF
4.7
F
0.01
F
25
REFADJ
AV = 1.638
MAX197
Figure 9a. Internal Reference
REF
10k
2.5V
26
CREF
4.7
F
2.5V
25
REFADJ
AV = 1.638
0.01
F
MAX197
Figure 9c. External Reference, Reference at REFADJ
REF
VDD
10k
2.5V
26
4.096V
CREF
4.7
F
25
REFADJ
AV = 1.638
MAX197
Figure 9b. External Reference, Reference at REF
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX197AMWI/PR | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX197AMYI | 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 |
| MAX197BC/D | 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 |
| MAX197BCAI | 功能描述:模数转换器 - ADC Integrated Circuits (ICs) 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 |
| MAX197BCAI+ | 功能描述:模数转换器 - ADC 12-Bit 8Ch 100ksps 4.18V Precision 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 |
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