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参数资料
| 型号： | MAX195AMDE |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | ADC |
| 英文描述： | 16-Bit, 85ksps ADC with 10レA Shutdown |
| 中文描述： | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP16 |
| 封装： | 0.300 INCH, SIDEBRAZED, CERAMIC, DIP-16 |
| 文件页数： | 15/28页 |
| 文件大小： | 311K |
| 代理商： | MAX195AMDE |
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Digital Noise
Digital noise can easily be coupled to AIN and REF. The
conversion clock (CLK) and other digital signals that are
active during input acquisition contribute noise to the con-
version result. If the noise signal is synchronous to the
sampling interval, an effective input offset is produced.
Asynchronous signals produce random noise on the input,
whose high-frequency components may be aliased into
the frequency band of interest. Minimize noise by present-
ing a low impedance (at the frequencies contained in the
noise signal) at the inputs. This requires bypassing AIN to
AGND, or buffering the input with an amplifier that has a
small-signal bandwidth of several megahertz, or prefer-
ably both. AIN has a bandwidth of about 16MHz.
Offsets resulting from synchronous noise (such as the
conversion clock) are canceled by the MAX195’s cali-
bration scheme. However, because the magnitude of
the offset produced by a synchronous signal depends
on the signal’s shape, recalibration may be appropriate
if the shape or relative timing of the clock or other digi-
tal signals change, as might occur if more than one
clock signal or frequency is used.
Distortion
Avoid degrading dynamic performance by choosing an
amplifier with distortion much less than the MAX195’s
THD (-97dB, or 0.0014%) at frequencies of interest. If
the chosen amplifier has insufficient common-mode
rejection, which results in degraded THD performance,
use the inverting configuration (positive input ground-
ed) to eliminate errors from this source. Low tempera-
ture-coefficient, gain-setting resistors reduce linearity
errors caused by resistance changes due to self-heat-
ing. Also, to reduce linearity errors due to finite amplifier
gain, use an amplifier circuit with sufficient loop gain at
the frequencies of interest (Figures 14, 15, 16).
DC Accuracy
If DC accuracy is important, choose a buffer with an
offset much less than the MAX195’s maximum offset
(±3LSB = ±366μV for a ±4V input range), or whose
offset can be trimmed while maintaining good stability
over the required temperature range.
Recommended Circuits
Figure 14 shows a good circuit for DC and low-frequen-
cy use. The MAX400 has very low offset (10μV) and
drift (0.2μV/°C), and low voltage noise (10nV/
√
Hz
) as
well. However, its gain-bandwidth product (GBW) is
much too low to drive AIN directly, so the analog input
is bypassed to present a low impedance at high fre-
quencies. The large bypass capacitor is isolated from
the amplifier output by a 100
resistor, which provides
additional noise filtering. Since the ±15V supplies
exceed the AIN range, add protection diodes at AIN
(see REF and AIN Input Protection section).
Figure 15 shows a wide-bandwidth amplifier (MAX427)
driving a wideband video buffer, which is capable of
driving AIN and a small bypass capacitor (for noise
reduction) directly. The video buffer is inside the
MAX427’s feedback loop, providing good DC accura-
cy, while the buffer’s low output impedance and high-
current capability provide good AC performance. AIN is
diode-clamped to the ±5V rails to prevent overvoltage.
The MAX427’s 15μV maximum offset voltage, 0.8μV/°C
maximum drift, and less than 5nV/
√
Hz
noise specifica-
tions make this an excellent choice for AC/DC use.
M
16-Bit, 85ksps ADC with 10μA S hutdown
______________________________________________________________________________________
15
MAX427
4
7
6
2
2
3
IN
+15V
-15V
0.0033
μ
F
0.1
μ
F
0.1
μ
F
ELANTEC
EL2003
4
1
7
+15V
-15V
0.1
μ
F
0.1
μ
F
100pF
1k
1k
1N914
1N914
+5V
-5V
AIN
10
Figure 15. AIN Buffer for AC/DC Use
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PDF描述 |
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| MAX195BEPE | 16-Bit, 85ksps ADC with 10レA Shutdown |
| MAX195BEWE | 16-Bit, 85ksps ADC with 10レA Shutdown |
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| MAX196-MAX198 | Multirange, Single %V, 12-Bit DAS with 12-Bit Bus Interface |
| MAX196AMYI | Circular Connector; No. of Contacts:18; Series:MS27505; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Pin; Circular Shell Style:Box Mount Receptacle; Insert Arrangement:15-18 RoHS Compliant: No |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX195BC/D | 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 |
| MAX195BCPE | 功能描述:模数转换器 - ADC Integrated Circuits (ICs) 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 |
| MAX195BCPE+ | 功能描述:模数转换器 - ADC 16-Bit 85ksps 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 |
| MAX195BCPE+T | 制造商:Maxim Integrated Products 功能描述:16-BIT, 85KSPS ADC WITH 10UA SHUTDOWN - Tape and Reel |
| MAX195BCWE | 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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