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参数资料
| 型号： | MAX1240BCPA |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | ADC |
| 英文描述： | +2.7V, Low-Power, 12-Bit Serial ADCs in 8-Pin SO |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP8 |
| 封装： | ROHS COMPLIANT, PLASTIC, DIP-8 |
| 文件页数： | 9/16页 |
| 文件大小： | 280K |
| 代理商： | MAX1240BCPA |
M
+2.7V, Low-Power,
12-Bit S erial ADCs in 8-Pin S O
_______________________________________________________________________________________
9
Higher source impedances can be used if a 0.01μF
capacitor is connected to the analog input. Note that
the input capacitor forms an RC filter with the input
source impedance, limiting the ADC’s input signal
bandwidth.
Input Bandwidth
The ADCs’ input tracking circuitry has a 2.25MHz small-
signal bandwidth, so it is possible to digitize high-
speed transient events and measure periodic signals
with bandwidths exceeding the ADC’s sampling rate by
using undersampling techniques. To avoid aliasing of
unwanted high-frequency signals into the frequency
band of interest, anti-alias filtering is recommended.
Analog Input Protection
Internal protection diodes, which clamp the analog
input to V
DD
and GND, allow the input to swing from
GND - 0.3V to V
DD
+ 0.3V without damage. However,
for accurate conversions near full scale, the input must
not exceed V
DD
by more than 50mV, or be lower than
GND by 50mV.
If the analog input exceeds 50mV beyond the sup-
plies, limit the input current to 2mA.
Internal Reference (MAX1240)
The MAX1240 has an on-chip voltage reference
trimmed to 2.5V. The internal reference output is con-
nected to REF and also drives the internal capacitive
DAC. The output can be used as a reference voltage
source for other components and can source up to
400μA. Bypass REF with a 4.7μF capacitor. Larger
capacitors increase wake-up time when exiting shut-
down (see the section Using
SHDN
to Reduce Supply
Current. The internal reference is enabled by pulling the
SHDN
pin high. Letting
SHDN
float disables the internal
reference, which allows the use of an external reference,
as described in the External Reference section.
External Reference
The MAX1240/MAX1241 operate with an external refer-
ence at the REF pin. To use the MAX1240 with an
external reference, disable the internal reference by let-
ting
SHDN
float. Stay within the +1.0V to V
DD
voltage
range to achieve specified accuracy. The minimum
input impedance is 18k
for DC currents. During con-
version, the external reference must be able to deliver
up to 250μA of DC load current and have an output
impedance of 10
or less. The recommended mini-
mum value for the bypass capacitor is 0.1μF. If the ref-
erence has higher output impedance or is noisy,
bypass it close to the REF pin with a 4.7μF capacitor.
____________________S erial Interfac e
Initialization after Power-Up and
S tarting a Conversion
When power is first applied, and if
SHDN
is not pulled
low, it takes the fully discharged 4.7μF reference
bypass capacitor up to 20ms to provide adequate
charge for specified accuracy. With an external refer-
ence, the internal reset time is 10μs after the power
supplies have stabilized. No conversions should be
performed during these times.
To start a conversion, pull
CS
low. At
CS
’s
falling edge,
the T/H enters its hold mode and a conversion is initiat-
COMPLETE CONVERSION SEQUENCE
t
WAKE
POWERED UP
POWERED DOWN
POWERED UP
CONVERSION 0
CONVERSION 1
DOUT
CS
SHDN
Figure 5. Shutdown Sequence
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1240BCPA+ | 功能描述:模数转换器 - ADC 12-Bit 73ksps 3.6V 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 |
| MAX1240BCSA | 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 |
| MAX1240BCSA+ | 功能描述:模数转换器 - ADC 12-Bit 73ksps 3.6V 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 |
| MAX1240BCSA+T | 功能描述:模数转换器 - ADC 12-Bit 73ksps 3.6V 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 |
| MAX1240BCSA-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 |
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