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參數(shù)資料
| 型號： | MAX195ACDE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | ADC |
| 英文描述： | 16-Bit, 85ksps ADC with 10レA Shutdown |
| 中文描述： | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP16 |
| 封裝： | 0.300 INCH, SIDEBRAZED, CERAMIC, DIP-16 |
| 文件頁數(shù)： | 21/28頁 |
| 文件大?。?/td> | 311K |
| 代理商： | MAX195ACDE |
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16-Bit, 85ksps ADC with 10μA S hutdown
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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 250μV, 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 0.1μF in parallel with 1μF or 10μF low-ESR
capacitors. Keep capacitor leads short for best supply-
noise rejection.
S hutdown
The MAX195 may be shut down by pulling BP/UP/
SHDN
low. In addition to lowering power dissipation to
10μW (100μW 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, 3.2μs is suffi-
cient settling time and also allows enough time for reac-
quisition of the analog input signal. 50μs 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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX195ACWE | 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 |
| MAX195ACWE+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 85ksps ADC with 10uA Shutdown 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 |
| MAX195ACWE+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 85ksps ADC with 10uA Shutdown 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 |
| MAX195ACWE-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 |
| MAX195AEDE | 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 |
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