参数资料
| 型号： | MX7828LN+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/12页 |
| 文件大小： | 0K |
| 描述： | IC ADC 8BIT HS 28-DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 14 |
| 位数： | 8 |
| 采样率（每秒）： | 400k |
| 数据接口： | 并联 |
| 转换器数目： | 3 |
| 功率耗散（最大）： | 75mW |
| 电压电源： | 单电源 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 28-DIP（0.600"，15.24mm） |
| 供应商设备封装： | 28-PDIP |
| 包装： | 管件 |
| 输入数目和类型： | 8 个单端，单极 |
Input Current
The converters’ analog inputs behave somewhat differ-
ently from conventional ADCs. The sampled data com-
parators take varying amounts of current from the input,
depending on the cycle they are in. The equivalent cir-
cuit of the converter is shown in Figure 9a. When the
conversion starts, AIN(n) is connected to the MS and
LS comparators. Thus, AIN(n) is connected to thirty-one
1pF capacitors.
To acquire the input signal in approximately 1s, the
input capacitors must charge to the input voltage
through the on-resistance of the multiplexer (about
600
) and the comparator’s analog switches (2k to
5k
per comparator). In addition, about 12pF of stray
capacitance must be charged. The input can be mod-
eled as an equivalent RC network shown in Figure 9b.
As RS (source impedance) increases, the capacitors
take longer to charge.
Since the length of the input acquisition time is internal-
ly set, large source resistances (greater than 100
) will
cause settling errors. The output impedance of an op-
amp is its open-loop output impedance divided by the
loop gain at the frequency of interest. It is important
that the amplifier driving the converter input have suffi-
cient loop gain at approximately 1MHz to maintain low
output impedance.
Input Filtering
The transients in the analog input caused by the sam-
pled data comparators do not degrade the converter’s
performance, since the ADC does not “look” at the
input when these transients occur. The comparator’s
outputs track the input during the first 1s of the con-
version, and are then latched. Therefore, at least 1s
will be provided to charge the ADC’s input capaci-
tance. It is not necessary to filter these transients with
an external capacitor on the AIN terminals.
Sinusoidal Inputs
The MAX154/MAX158 and MX7824/MX7828 can mea-
sure input signals with slew rates as high as 157mV/s
to the rated specifications. This means that the analog
input frequency can be as high as 10kHz without the
aid of an external track/hold. The maximum sampling
rate is limited by the conversion time (typical tCRD =
2s) plus the time required between conversions (tp =
500ns). It is calculated as:
fMAX =
1
=
1
= 400kHz
tCRD + tp
(2.0 + 0.5) s
MX7824/MX7828
CMOS, High-Speed, 8-Bit ADCs
with Multiplexer
_______________________________________________________________________________________
9
MAX154
MAX158
VIN
GND
VDD
REF OUT
VREF+
AINx(+)
AINx(-)
+5V
0.1
F47F
0.01
F
VREF-
MX7824
MX7828
MX584
VIN
GND
VDD
VREF+
AINx(+)
AINx(-)
+5V
2.5V
0.1
F
47
F
VREF-
MAX154
MAX158
MX7824
MX7828
VIN
GND
VDD
VREF+
AINx(+)
AINx(-)
+5V
0.1
F
47
F
VREF-
MAX154
MAX158
MX7824
MX7828
VIN
GND
* Current path must
still exist from
VIN(-) to Ground
VDD
VREF+
AINx(+)
AINx(-)
+5V
2.5V
0.1
F47F
VREF-
*
Figure 8a. Internal Reference (MAX154/MAX158 only)
Figure 8b. External Reference +2.5V Full-Scale
Figure 8c. Power Supply as Reference
Figure 8d. Inputs Not Referenced to GND
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MX7828LN+ | 功能描述:模数转换器 - ADC 8-Bit 8Ch 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 |
| MX7828LP | 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 |
| MX7828LP+ | 功能描述:模数转换器 - ADC 8-Bit 8Ch 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 |
| MX7828LP+T | 功能描述:模数转换器 - ADC 8-Bit 8Ch 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 |
| MX7828LP-T | 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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