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参数资料
| 型号： | MAX1280BEUP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 400KSPS 20-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 位数： | 12 |
| 采样率（每秒）： | 400k |
| 数据接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 559mW |
| 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： | 20-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-TSSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 8 个单端，单极；8 个单端，双极；4 个伪差分，单极；4 个伪差分，双极 |
MAX1280/MAX1281
400ksps/300ksps, Single-Supply, Low-Power, 8-Channel,
Serial 12-Bit ADCs with Internal Reference
12
______________________________________________________________________________________
10
F
0.1
F
2.5V
VDD1
VDD2
GND
COM
CS
SCLK
DIN
DOUT
SSTRB
SHDN
TO VDD2
0.01
F
CH7
REFADJ
REF
4.7
F
0V TO
2.500V
ANALOG
INPUT
OSCILLOSCOPE
CH1
CH2
CH3
CH4
*FULL-SCALE ANALOG INPUT, CONVERSION RESULT = $FFF (HEX)
MAX1280
MAX1281
+3V or +5V
EXTERNAL CLOCK
SCLK
SSTRB
DOUT*
0.01
F
Figure 5. Quick-Look Circuit
Track/Hold
The T/H enters its tracking mode on the falling clock
edge after the fifth bit of the 8-bit control word has been
shifted in. It enters its hold mode on the falling clock
edge after the eighth bit of the control word has been
shifted in. If the converter is set up for single-ended
inputs, IN- is connected to COM and the converter con-
verts the “+” input. If the converter is set up for differen-
tial inputs, the difference of [(IN+) - (IN-)] is converted.
At the end of the conversion, the positive input con-
nects back to IN+ and CHOLD charges to the input sig-
nal.
The time required for the T/H to acquire an input signal
is a function of how quickly its input capacitance is
charged. If the input signal’s source impedance is high,
the acquisition time lengthens, and more time must be
allowed between conversions. The acquisition time,
tACQ, is the maximum time the device takes to acquire
the signal and is also the minimum time needed for the
signal to be acquired. It is calculated by the following
equation:
tACQ = 9 (RS + RIN) 12pF
where RIN = 800, RS = the source impedance of the
input signal; tACQ is never less than 468ns (MAX1280)
or 625ns (MAX1281). Note that source impedances
below 2k
do not significantly affect the ADC’s AC per-
formance.
Input Bandwidth
The ADC’s input tracking circuitry has a 6MHz
(MAX1280) or 3MHz (MAX1281) small-signal band-
width, so it is possible to digitize high-speed transient
events and measure periodic signals with bandwidths
exceeding the ADC’s sampling rate by using under-
sampling techniques. To avoid high-frequency signals
being aliased into the frequency band of interest, anti-
alias filtering is recommended.
Analog Input Protection
Internal protection diodes, which clamp the analog
input to VDD1 and GND, allow the channel input pins to
swing from GND - 0.3V to VDD1 + 0.3V without dam-
age. However, for accurate conversions near full scale,
the inputs must not exceed VDD1 by more than 50mV or
be lower than GND by 50mV.
If the analog input exceeds 50mV beyond the sup-
plies, do not allow the input current to exceed 2mA.
Quick Look
To quickly evaluate the MAX1280/MAX1281’s analog
performance, use the circuit of Figure 5. The MAX1280/
MAX1281 require a control byte to be written to DIN
before each conversion. Connecting DIN to VDD2 feeds
in control bytes of $FF (HEX), which trigger single-
ended unipolar conversions on CH7 without powering
down between conversions. The SSTRB output pulses
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1280EVC16 | 功能描述:数据转换 IC 开发工具 MAX1280 Eval System RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| MAX1280EVKIT | 功能描述:数据转换 IC 开发工具 MAX1280 Eval Kit RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| MAX1281BCUP | 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 |
| MAX1281BCUP+ | 功能描述:模数转换器 - ADC 12-Bit 8Ch 300ksps 3.6V 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 |
| MAX1281BCUP+T | 功能描述:模数转换器 - ADC 12-Bit 8Ch 300ksps 3.6V 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 |
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