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参数资料
| 型号： | MAX191ACWG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 100KSPS 24-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 30 |
| 位数： | 12 |
| 采样率（每秒）： | 100k |
| 数据接口： | MICROWIRE?，并联，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 941mW |
| 电压电源： | 双 ± |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 管件 |
| 输入数目和类型： | 2 个单端，单极；2 个单端，双极；1 个差分，单极；1 个差分，双极 |
various interface modes.
The time required for the T/H to acquire an input signal
is a function of how quickly its input capacitance is
charged. If the input signal’s source impedance is high,
the acquisition time lengthens and more time must be
allowed between conversions. Acquisition time is cal-
culated by: tACQ = 10(RS + RIN)CHOLD (but never less
than 2s), where RIN = 2k, RS = source impedance of
the input signal, and CHOLD = 32pF (see Figure 4).
Input Bandwidth
The ADC’s input tracking circuitry has a 1MHz typical
large-signal bandwidth characteristic, and a 30V/s
slew rate. It is possible to digitize high-speed transients
and measure periodic signals with bandwidths exceed-
ing the ADC’s sample rate of 100ksps by using under-
sampling techniques. Note that if undersampling is
used to measure high-frequency signals, special care
must be taken to avoid aliasing errors. Without ade-
quate input bandpass filtering, out-of-band signals and
noise may be aliased into the measurement band.
Input Protection
Internal protection diodes, which clamp the analog input
to VDD and VSS , allow AIN+ to swing from (VSS - 0.3V) to
(VDD + 0.3V) with no risk of damage to the ADC.
However, for accurate conversions near full scale, AIN+
should not exceed the power supplies by more than
50mV because ADC accuracy is affected when the pro-
tection diodes are even slightly forward biased.
Digital Interface
Starting a Conversion
In parallel mode, the ADC is controlled by the CS, RD,
and HBEN inputs, as shown in Figure 6. The T/H
enters hold mode and a conversion starts at the falling
edge of CS and RD while HBEN (not shown) is low.
BUSY goes low as soon as the conversion starts. On
the falling edge of the 13th input clock pulse after the
conversion starts, BUSY goes high and the conversion
result is latched into three-state output buffers. In seri-
al mode, the falling edge of CS initiates a conversion,
and the T/H enters hold mode. Data is shifted out seri-
ally as the conversion proceeds (Figure 10). See the
Parallel Digital-Interface Mode and Serial-Interface
Mode sections for details.
Internal/External Clock
Figure 5 shows the MAX191 clock circuitry. The ADC
includes internal circuitry to generate a clock with an
external capacitor. As indicated in the
Typical
Operating Characteristics, a 120pF capacitor con-
nected between the CLK and DGND pins generates
a 1MHz nominal clock frequency (Figure 5).
Alternatively, an external clock (between 100kHz and
1.6MHz) can be applied to CLK. When using an exter-
nal clock source, acceptable clock duty cycles are
MAX191
Low-Power, 12-Bit Sampling ADC
with Internal Reference and Power-Down
_______________________________________________________________________________________
9
12-BIT DAC
TRACK
CHOLD
COMPARATOR
HOLD
32pF
HOLD
CSWITCH
10pF
CPACKAGE
5pF
AIN +
AIN -
RIN
Figure 4. Equivalent Input Circuit
CEXT
DGND
CLK
+1.6V
CLOCK
MAX191
NOTE: CEXT = 120pF GENERATES 1MHz NOMINAL CLOCK
Figure 5. Internal Clock Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX191ACWG+ | 功能描述:模数转换器 - ADC 12Bit 100ksps 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 |
| MAX191ACWG+T | 功能描述:模数转换器 - ADC 12Bit 100ksps 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 |
| MAX191ACWG-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 |
| MAX191AENG | 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 |
| MAX191AENG+ | 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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