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| 型号： | MAX1242AESA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC ADC 10BIT SERIAL 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 位数： | 10 |
| 采样率（每秒）： | 73k |
| 数据接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 471mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 输入数目和类型： | 1 个单端，单极 |
MAX1242/MAX1243
+2.7V to +5.25V, Low-Power, 10-Bit
Serial ADCs in SO-8
7
Maxim Integrated
AIN
TRACK INPUT
HOLD
GND
TRACK
HOLD
9k
Ω
RIN
CHOLD
16pF
-+
CSWITCH
COMPARATOR
ZERO
REF
CAPACITIVE DAC
AT THE SAMPLING INSTANT,
THE INPUT SWITCHES FROM
AIN TO GND.
SHUTDOWN
INPUT
ANALOG INPUT
0V TO VREF
+2.7V to +5.25V
1
2
3
4
VDD
AIN
SHDN
REF
8
7
6
5
SCLK
CS
DOUT
GND
SERIAL
INTERFACE
C*
*4.7
μF, MAX1242
0.1
μF, MAX1243
4.7
μF 0.1μF
REFERENCE
INPUT
MAX1243
MAX1242
MAX1243
Figure 3. Operational Diagram
Figure 4. Equivalent Input Circuit
where RIN = 9kΩ, RS = the input signal’s source imped-
ance, and tACQ is never less than 1.5s. Source imped-
ances below 4k
Ω do not significantly affect the ADC’s
AC performance.
Higher source impedances can be used if a 0.01F
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 ADC’s input tracking circuitry has a 2.25MHz
small-signal bandwidth, so it is possible to digitize
high-speed transient events and measure periodic sig-
nals 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 recom-
mended.
Analog Input Protection
Internal protection diodes, which clamp the analog
input to VDD and GND, allow the input to swing from
GND - 0.3V to VDD + 0.3V without damage. However,
for accurate conversions near full scale, the input must
not exceed VDD by more than 50mV, or be lower than
GND by 50mV.
If the analog input exceeds 50mV beyond the supplies,
limit the input current to 2mA.
Internal Reference (MAX1242)
The MAX1242 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
400A. Bypass REF with a 4.7F capacitor. Larger
capacitors increase wake-up time when exiting shut-
down (see
Using SHDN to Reduce Supply Current).
The internal reference is enabled by pulling the SHDN
pin high. Letting SHDN open disables the internal refer-
ence, which allows the use of an external reference, as
described in the
External Reference section.
External Reference
The MAX1242/MAX1243 operate with an external refer-
ence at the REF pin. To use the MAX1242 with an
external reference, disable the internal reference by let-
ting SHDN open. Stay within the voltage range 1.0V to
VDD to achieve specified accuracy. The minimum input
impedance is 18k
Ω for DC currents. During conver-
sion, the external reference must be able to deliver up
to 250A of DC load current and have an output
impedance of 10
Ω or less. The recommended mini-
mum value for the bypass capacitor is 0.1F. If the ref-
erence has higher output impedance or is noisy,
bypass it close to the REF pin with a 4.7F capacitor.
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相关代理商/技术参数 |
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| MAX1242AESA+ | 功能描述:模数转换器 - ADC 10-Bit 73ksps 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 |
| MAX1242AESA+T | 功能描述:模数转换器 - ADC 10-Bit 73ksps 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 |
| MAX1242AESA-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 |
| MAX1242AMJA | 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 |
| MAX1242BCPA | 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 |
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