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参数资料
| 型号： | MAX117EVKIT-DIP |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/12页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT FOR MAX117 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 8 |
| 采样率（每秒）： | 400k |
| 数据接口： | 并联 |
| 输入范围： | ±VREF |
| 在以下条件下的电源（标准）： | 4.5mW @ 400kSPS |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | MAX117，MAX118 |
| 已供物品： | 板，CD |
If the analog input exceeds 50mV beyond the sup-
plies, limit the input current to no more than two
milliamperes, as excessive current will degrade the
conversion accuracy of the on channel.
Track/Hold
The track/hold enters hold mode when a conversion
starts (
RD low or WR low). INT goes low at the end of
the conversion, at which point the track/hold enters
track mode. The next conversion can start after the
minimum acquisition time, tACQ.
Transfer Function
Figure 10 shows the MAX113/MAX117’s nominal trans-
fer function. Code transitions occur halfway between
successive-integer LSB values. Output coding is binary
with 1LSB = (VREF+ - VREF-) / 256.
Conversion Rate
The maximum sampling rate (fMAX) for the MAX113/
MAX117 is achieved in write-read mode (tRD < tINTL)
and is calculated as follows:
where tWR = the write pulse width, tRD = the delay
between write and read pulses, tRI = RD to INT delay,
and tACQ = minimum acquisition time.
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 all
other ADC output signals. The output spectrum is limit-
ed to frequencies above DC and below one-half the
ADC sample rate.
The theoretical minimum analog-to-digital noise is
caused by quantization error, and results directly from
the ADC’s resolution: SNR = (6.02N + 1.76)dB, where
N is the number of bits of resolution. Therefore, a per-
fect 8-bit ADC can do no better than 50dB.
The FFT Plot (see
Typical Operating Characteristics)
shows the result of sampling a pure 30.27kHz sinusoid
at a 400kHz rate. This FFT plot of the output shows the
output level in various spectral bands.
The effective resolution (or “effective number of bits”)
the ADC provides can be measured by transposing the
equation that converts resolution to SNR: N = (SINAD -
1.76) / 6.02 (see
Typical Operating Characteristics).
Total Harmonic Distortion
Total harmonic distortion (THD) is the ratio of the RMS
sum of all harmonics of the input signal (in the frequen-
cy band above DC and below one-half the sample rate)
to the fundamental itself. This is expressed as:
where V1 is the fundamental RMS amplitude, and V2
through VN are the amplitudes of the 2nd through Nth
harmonics.
Spurious-Free Dynamic Range
Spurious-free dynamic range (SFDR) is the ratio of the
fundamental RMS amplitude to the amplitude of the
next largest spectral component (in the frequency band
above DC and below one-half the sample rate). Usually
the next largest spectral component occurs at some
harmonic of the input frequency. However, if the ADC is
exceptionally linear, it may occur only at a random
peak in the ADC’s noise floor. See the Signal-to-Noise
Ratio graph in
Typical Operating Characteristics.
THD = 20log
V
...V
V
2
3
2
4
2
N
2
1
+++
f=
1
t
+ t
f
1
600ns 800ns
300ns 450ns
f
465kHz
MAX
WR
RD
RI
ACQ
MAX
=
++
+
=
MAX113/MAX117
+3V, 400ksps, 4/8-Channel,
8-Bit ADCs with 1A Power-Down
______________________________________________________________________________________
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| MAX11800ETC/V+T | 功能描述:触摸屏转换器和控制器 SPI 4Ch Touch Screen Controller RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| MAX11800ETC+ | 功能描述:触摸屏转换器和控制器 SPI 4Ch Touch Screen Controller RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| MAX11800ETC+T | 功能描述:触摸屏转换器和控制器 SPI 4Ch Touch Screen Controller RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
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