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| 型号： | MAX1143BCAP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT 200KSPS 20-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 位数： | 14 |
| 采样率（每秒）： | 200k |
| 数据接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 640mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个单端，单极；1 个单端，双极 |
MAX1142/MAX1143
14-Bit ADC, 200ksps, +5V Single-Supply
with Reference
14
______________________________________________________________________________________
External reference
An external reference can be placed at either the input
(REFADJ) or the output (REF) of the MAX1142/
MAX1143’s internal buffer amplifier.
When connecting an external reference to REFADJ, the
input impedance is typically 9k
. Using the buffered
REFADJ input makes buffering of the external reference
unnecessary. The internal buffer output must be
bypassed at REF with a 2.2F capacitor.
When connecting an external reference at REF,
REFADJ must be connected to AVDD. The input imped-
ance at REF is 16k
for DC currents. During conver-
sion, an external reference at REF must deliver 250A
DC load current and have an output impedance of 10
or less. If the reference has a higher output impedance
or is noisy, bypass it at the REF pin with a 4.7F capac-
itor.
Analog Input
The MAX1142/MAX1143 use a capacitive DAC that
provides an inherent track/hold function. Drive AIN with
a source impedance less than 10
. Any signal condi-
tioning circuitry must settle with 16-bit accuracy in less
than 500ns. Limit the input bandwidth to less than half
the sampling frequency to eliminate aliasing. The
MAX1142/MAX1143 has a complex input impedance
which varies from unipolar to bipolar mode (Figure 1).
Input Range
The analog input range in unipolar mode is 0 to +12V
for the MAX1142, and 0 to +4.096V for the MAX1143. In
bipolar mode, the analog input can be -12V to +12V for
the MAX1142, and -4.096V to +4.096V for the
MAX1143. Unipolar and bipolar mode is programmed
with the UNI/
BIP bit of the Control-Byte. When using a
reference other than the MAX1142/MAX1143’s internal
+4.096V reference, the full-scale input range will vary
accordingly. The full-scale input range depends on the
voltage at REF and the sampling mode selected (Tables
3 and 4).
Input Acquisition and Settling
Clocking-in a Control-Byte starts input acquisition. In
bipolar mode, the main capacitor array starts acquiring
the input as soon as a start bit is recognized. If unipolar
mode is selected by the second DIN bit, the part will
immediately switch to unipolar sampling mode and
acquire a sample.
Acquisition can be extended by eight clock cycles by
setting M1 = 1, M0 = 1 (long acquisition mode). The
sampling instant in short acquisition completes on the
falling edge of the sixth clock cycle after the start bit
(Figure 2).
+5V
510k
100k
24k
0.22
F
REFADJ
MAX1142
Figure 7. MAX1142 Reference-Adjust Circuit
Table 3. Unipolar Full Scale and Zero Scale
PART
REFERENCE
ZERO SCALE
FULL SCALE
Internal
0
+12V
MAX1142
External
0
+12(VREF/4.096)
Internal
0
+4.096V
MAX1143
External
0
+VREF
Table 4. Bipolar Full Scale, Zero Scale, and Negative Scale
PART
REFERENCE
NEGATIVE FULL
SCALE
ZERO SCALE
FULL SCALE
Internal
-12V
0
+12V
MAX1142
External
-12(VREF/4.096)
0
+12(VREF/4.096)
Internal
-4.096V
0
+4.096V
MAX1143
External
-VREF
0
+VREF
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1143BEAP | 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 |
| MAX1144 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:14-Bit ADCs.150ksps.3.3V Single Supply |
| MAX1144ACAP | 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 |
| MAX1144ACAP+ | 功能描述:模数转换器 - ADC 14-Bit 150ksps 2.2V 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 |
| MAX1144ACAP+T | 功能描述:模数转换器 - ADC 14-Bit 150ksps 2.2V 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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