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参数资料
| 型号： | MAX189CEWE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/18页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT SERIAL LP 16SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 位数： | 12 |
| 采样率（每秒）： | 75k |
| 数据接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 478mW |
| 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： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个单端，单极 |
MAX187/MAX189
+5V, Low-Power, 12-Bit Serial ADCs
16
Maxim Integrated
Layout, Grounding, Bypassing
For best performance, use printed circuit boards. Wire-
wrap boards are not recommended. Board layout should
ensure that digital and analog signal lines are separated
from each other. Do not run analog and digital (especially
clock) lines parallel to one another, or digital lines under-
neath the ADC package.
Figure 17 shows the recommended system ground con-
nections. A single-point analog ground (“star” ground
point) should be established at GND, separate from the
logic ground. All other analog grounds should be con-
nected to this ground. The 16-pin versions also have a
dedicated DGND pin available. Connect DGND to this
star ground point for further noise reduction. No other
digital system ground should be connected to this single-
point analog ground. The ground return to the power
supply for this ground should be low impedance and as
short as possible for noise-free operation.
High-frequency noise in the VDD power supply may
affect the ADC’s high-speed comparator. Bypass this
supply to the single-point analog ground with 0.01FF
and 4.7FF bypass capacitors. Minimize capacitor lead
lengths for best supply-noise rejection. If the +5V power
supply is very noisy, a 10I resistor can be connected
as a lowpass filter to attenuate supply noise (Figure 17).
Figure 17. Power-Supply Grounding Condition
SUPPLIES
+5V
GND
DGND
+5V
DIGITAL
CIRCUITRY
DGND
AGND
VDD
MAX187
MAX189
*OPTIONAL
R* = 10I
4.7F
0.01F
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