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参数资料
| 型号： | MAX195BCPE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT 85KSPS SHTDN 16-DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 25 |
| 位数： | 16 |
| 采样率（每秒）： | 85k |
| 数据接口： | QSPI?，串行，SPI? |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 80mW |
| 电压电源： | 模拟和数字，双 ± |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 16-PDIP |
| 包装： | 管件 |
| 输入数目和类型： | 1 个单端，单极；1 个单端，双极 |
| 产品目录页面： | 1393 (CN2011-ZH PDF) |
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MAX195
16-Bit, 85ksps ADC with 10A Shutdown
______________________________________________________________________________________
21
Be sure that digital return currents do not pass through
the analog ground and that return-current paths are low
impedance. A 5mA current flowing through a PC board
ground trace impedance of only 0.05
creates an error
voltage of about 250V, or about 2LSBs error with a
±4V full-scale system.
The board layout should ensure as much as possible
that digital and analog signal lines are kept separate.
Do not run analog and digital (especially clock) lines
parallel to one another. If you must cross one with the
other, do so at right angles.
The ADC’s high-speed comparator is sensitive to high-
frequency noise on the VDDA and VSSA power sup-
plies. Bypass these supplies to the analog ground
plane with 0.1F in parallel with 1F or 10F low-ESR
capacitors. Keep capacitor leads short for best supply-
noise rejection.
Shutdown
The MAX195 may be shut down by pulling BP/UP/
SHDN low. In addition to lowering power dissipation to
10W (100W max) when the device is not in use, you
can save considerable power by shutting the converter
down for short periods between conversions. There is
no need to perform a reset (calibration) after the con-
verter has been shut down unless the time in shutdown
is long enough that the supply voltages or ambient tem-
perature may have changed.
The time required for the converter to “wake up” and
settle depends heavily on the amount of additional error
acceptable. For 0.5LSB additional error, 3.2s is suffi-
cient settling time and also allows enough time for reac-
quisition of the analog input signal. 50s settling is
required for less than 0.1LSB error. Figure 23 is a
graph of theoretical power consumption vs. conver-
sions per second for the MAX195 that assumes the
conversion clock is 1.7MHz and the converter is shut
down as much as possible between conversions.
Stop CLK before shutting down the MAX195. CLK must
be stopped without generating short clock pulses. Short
CLK pulses (less than 150ns), or shutting down the
MAX195 without stopping CLK, may adversely affect the
MAX195’s internal calibration data. In applications
where CLK is free-running and asynchronous, use the
circuit of Figure 24 to stop CLK cleanly.
To minimize the time required to settle and perform a
conversion, shut the converter down only after a con-
version is finished and the desired mode (unipolar or
bipolar) has been set. This ensures that the sampling
capacitor array is properly connected to the input sig-
nal. If shut down in mid-conversion, when awakened,
Figure 21. MAX195 Code Listing for 68HC16 Module and Circuit of Figure 19 (continued)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX195BCPE+ | 功能描述:模数转换器 - ADC 16-Bit 85ksps 5V 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 |
| MAX195BCPE+T | 制造商:Maxim Integrated Products 功能描述:16-BIT, 85KSPS ADC WITH 10UA SHUTDOWN - Tape and Reel |
| MAX195BCWE | 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 |
| MAX195BCWE+ | 功能描述:模数转换器 - ADC 16-Bit 85ksps 5V 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 |
| MAX195BCWE+T | 功能描述:模数转换器 - ADC 16-Bit 85ksps 5V 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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