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参数资料
| 型号： | MAX132EWG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT SERIAL 24-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 位数： | 18 |
| 采样率（每秒）： | 100 |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 转换器数目： | 1 |
| 电压电源： | 双 ± |
| 工作温度： | -40°C ~ 85°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： | 带卷 (TR) |
| 输入数目和类型： | 1 个伪差分，双极 |
____________Functional Description
The MAX132 integrates the input voltage for a fixed
period of time, then deintegrates a known reference
voltage and measures the time required to reach zero.
Good line rejection is achieved by setting the (input)
integration time equal to one 50Hz or 60Hz period. The
MAX132 has a 50Hz/60Hz mode selection bit that sets
the integration time to 655/545 clock periods, respec-
tively, so that 50Hz/60Hz rejection is obtained with a
32,768Hz crystal. The MAX132 is tested and guaran-
teed at a 16 conv/sec throughput rate. Figure 1 shows
the basic MAX132 application circuit, with component
values selected for 16 conv/sec .
For applications that don’t require 50Hz/60Hz rejection,
the MAX132 will operate up to 100 conv/sec at reduced
accuracy (typically 0.012% FSR nonlinearity, or ±13
bits). In these applications, the 50Hz mode is recom-
mended because of its longer (655 count) integration
time. See
Increased Speed section.
__________Analog Design Procedure
Input Voltage Range
and Input Protection
The recommended analog full-scale input range is
±512mV. Performance is tested and guaranteed at
±512mV full scale, corresponding to a 2V/LSB resolu-
tion at 18 bits. Resolution is defined as follows:
which corresponds to 2V/LSB resolution at 18 bits.
Consult the
Typical Operating Characteristics for Noise
vs. Number of Samples Averaged and other important
operating parameters. Note how accuracy depends on
common-mode input voltage (common mode is defined
here as
|VIN LO - AGND|). For optimum performance,
set the analog input full-scale between ±470mV and
MAX132
±18-Bit ADC with Serial Interface
6
_______________________________________________________________________________________
Re
/
(
) /
,
solution Volts LSB
V
FS
IN
[] =
262 144
3k
DOUT
a. High-Z to VOH (t8)
b. High-Z to VOL (t8)
DGND
+5V
CL
Figure 3. Load Circuits for Access Time
3k
DOUT
a. VOH to High-Z (t10)
b. VOL to High-Z (t10)
DGND
+5V
10pF
Figure 4. Load Circuits for Disable Time to Three-State
DIN
t2
t4
t1
t3
t9
t10
t6
t8
t7
t11, t12
t5
SCLK
CS
DOUT
P0–P3
MSB IN
B6–B1
LSB IN
LSB OUT
B6–B1
MSB OUT
Figure 2. Serial-Mode Timing
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