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参数资料
| 型号： | MAX189CEWE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/18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
12
Maxim Integrated
Minimum cycle time is accomplished by using DOUT’s
rising edge as the EOC signal. Clock out the data with
13 clock cycles at full speed. Raise CS after the conver-
sion’s LSB has been read. After the specified minimum
time, tACQ, CS can be pulled low again to initiate the next
conversion.
Output Coding and Transfer Function
The data output from the MAX187/MAX189 is binary, and
Figure 10 depicts the nominal transfer function. Code
transitions occur halfway between successive integer
LSB values. If VREF = +4.096V, then 1 LSB = 1.00mV or
4.096V/4096.
Dynamic Performance
High-speed sampling capability and a 75ksps throughput
make the MAX187/MAX189 ideal for wideband signal pro-
cessing. To support these and other related applications,
Fast Fourier Transform (FFT) test techniques are used
to guarantee the ADC’s dynamic frequency response,
distortion, and noise at the rated throughput. Specifically,
this involves applying a low-distortion sine wave to the
ADC input and recording the digital conversion results for
a specified time. The data is then analyzed using an FFT
algorithm that determines its spectral content. Conversion
errors are then seen as spectral elements outside of the
fundamental input frequency. ADCs have traditionally
been evaluated by specifications such as Zero and Full-
Scale Error, Integral Nonlinearity (INL), and Differential
Nonlinearity (DNL). Such parameters are widely accepted
for specifying performance with DC and slowly varying
signals, but are less useful in signal-processing applica-
tions, where the ADC’s impact on the system transfer
function is the main concern. The significance of various
DC errors does not translate well to the dynamic case, so
different tests are required.
Signal-to-Noise Ratio and
Effective Number of Bits
Signal-to-noise plus distortion (SINAD) is the ratio of the
fundamental input frequency’s RMS amplitude to the
RMS amplitude of all other ADC output signals. The input
bandwidth is limited to frequencies above DC and below
one-half the ADC sample (conversion) rate.
The theoretical minimum ADC noise is caused by quanti-
zation error and is a direct result of the ADC’s resolution:
SINAD = (6.02N + 1.76)dB, where N is the number of bits
of resolution. An ideal 12-bit ADC can, therefore, do no
better than 74dB. An FFT plot of the output shows the out-
put level in various spectral bands. Figure 11 shows the
result of sampling a pure 10kHz sine wave at a 75ksps
rate with the MAX187/MAX189.
Figure 10. MAX187/MAX189 UnipolarTransfer Function, 4.096V
= Full Scale
Figure 11. MAX187/MAX189 FFT plot
11...111
11...110
11...101
00...011
00...010
00...01
00...000
01
2FS
OUTPUT CODE
FS - 3/2 LSB
INPUT VOLTAGE (LSBs)
FS = +4.096V
1 LSB = FS
4096
FULL-SCALE
TRANSITION
3
AMPLITUDE
(dB)
20
0
-20
-40
-60
-80
-100
-120
-140
0
18.75
37.5
fS = 75ksps
fT = 10kHz
TA = +25°C
FREQUENCY (kHz)
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