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参数资料
| 型号： | MAX186ACWP |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | ADC |
| 英文描述： | Low-Power, 8-Channel, Serial 12-Bit ADCs |
| 中文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封装： | SO-20 |
| 文件页数： | 14/24页 |
| 文件大小： | 245K |
| 代理商： | MAX186ACWP |
M
Data Framing
The falling edge of
CS
does
not
start a conversion on the
MAX186/MAX188. The first logic high clocked into DIN is
interpreted as a start bit and defines the first bit of the
control byte. A conversion starts on the falling edge of
SCLK, after the eighth bit of the control byte (the PD0 bit)
is clocked into DIN. The start bit is defined as:
The first high bit clocked into DIN with
CS
low any-
time the converter is idle, e.g. after V
CC
is applied.
OR
The first high bit clocked into DIN after bit 5 of a
conversion in progress is clocked onto the DOUT pin.
If a falling edge on
CS
forces a start bit before bit 5
(B5) becomes available, then the current conversion
will be terminated and a new one started. Thus, the
fastest the MAX186/MAX188 can run is 15 clocks per
conversion. Figure 11a shows the serial-interface timing
necessary to perform a conversion every 15 SCLK
cycles in external clock mode. If
CS
is low and SCLK is
continuous, guarantee a start bit by first clocking in 16
zeros.
Most microcontrollers require that conversions occur in
multiples of 8 SCLK clocks; 16 clocks per conversion
will typically be the fastest that a microcontroller can
drive the MAX186/MAX188. Figure 11b shows the
serial-interface timing necessary to perform a conver-
sion every 16 SCLK cycles in external clock mode.
__________ Applic ations Information
Power-On Reset
When power is first applied and if
SHDN
is not pulled
low, internal power-on reset circuitry will activate the
MAX186/MAX188 in internal clock mode, ready to con-
vert with SSTRB = high. After the power supplies have
been stabilized, the internal reset time is 100μs and no
conversions should be performed during this phase.
SSTRB is high on power-up and, if
CS
is low, the first
logical 1 on DIN will be interpreted as a start bit. Until a
conversion takes place, DOUT will shift out zeros.
Referenc e-Buffer Compensation
In addition to its shutdown function, the
SHDN
pin also
selects internal or external compensation. The compen-
sation affects both power-up time and maximum conver-
sion speed. Compensated or not, the minimum clock
rate is 100kHz due to droop on the sample-and-hold.
To select external compensation, float
SHDN
. See the
Typical Operating Circuit which uses a 4.7μF capacitor at
VREF. A value of 4.7μF or greater ensures stability and
allows operation of the converter at the full clock speed of
2MHz. External compensation increases power-up time (see
the Choosing Power-Down Modesection, and Table 5).
Internal compensation requires no external capacitor at
VREF, and is selected by pulling
SHDN
high. Internal com-
pensation allows for shortest power-up times, but is only
available using an external clock and reduces the maxi-
mum clock rate to 400kHz.
Low-Power, 8-Channel,
S erial 12-Bit ADCs
14
______________________________________________________________________________________
PD0 CLOCK IN
t
SSTRB
t
CSH
t
CONV
t
SCK
SSTRB
SCLK
t
CSS
NOTE: FOR BEST NOISE PERFORMANCE, KEEP SCLK LOW DURING CONVERSION.
CS
Figure 10. Internal Clock Mode SSTRB Detailed Timing
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX186ACWP+ | 功能描述:模数转换器 - ADC 12-Bit 8Ch 133ksps 5.25V 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 |
| MAX186ACWP+T | 功能描述:模数转换器 - ADC 12-Bit 8Ch 133ksps 5.25V 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 |
| MAX186ACWP-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 |
| MAX186AEAP | 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 |
| MAX186AEAP+ | 功能描述:模数转换器 - ADC 12-Bit 8Ch 133ksps 5.25V 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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