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参数资料
| 型号： | MAX1280BEUP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/24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
______________________________________________________________________________________
19
18k
. During conversion, an external reference at REF
must deliver up to 350A DC load current and have 10
or less output impedance. If the reference has a higher
output impedance or is noisy, bypass it close to the REF
pin with a 4.7F capacitor.
Using the REFADJ input makes buffering the external
reference unnecessary. To use the direct REF input,
disable the internal buffer by connecting REFADJ to
VDD1.
Transfer Function
Table 5 shows the full-scale voltage ranges for unipolar
and bipolar modes. Figure 14 depicts the nominal,
unipolar input/output (I/O) transfer function, and Figure
15 shows the bipolar I/O transfer function. Code transi-
tions occur halfway between successive-integer LSB
values. Output coding is binary, with 1LSB = 610V
for unipolar and bipolar operation.
Layout, Grounding, and Bypassing
For best performance, use printed circuit boards; wire-
wrap boards are not recommended. Board layout
should ensure that digital and analog signal lines are
separated from each other. Do not run analog and digi-
tal (especially clock) lines parallel to one another, or
digital lines underneath the ADC package.
Figure 16 shows the recommended system ground
connections. Establish a single-point analog ground
(star ground point) at GND. Connect all analog grounds
to the star ground. Connect the digital system ground
to star ground at this point only. For lowest-noise opera-
tion, the ground return to the star ground’s power sup-
ply should be low impedance and as short as possible.
High-frequency noise in the VDD1 power supply may
affect the high-speed comparator in the ADC. Bypass
the supply to the star ground with 0.1F and 10F
capacitors, located close to pin 20 of the MAX1280/
MAX1281. Minimize capacitor lead lengths for best
supply-noise rejection. If the power supply is very
noisy, a 10
resistor can be connected as a lowpass
filter (Figure 16).
+3.3V
510k
24k
100k
0.01
F
12
REFADJ
MAX1281
Figure 13. MAX1281 Reference-Adjust Circuit
OUTPUT CODE
FULL-SCALE
TRANSITION
11 . . . 111
11 . . . 110
11 . . . 101
00 . . . 011
00 . . . 010
00 . . . 001
00 . . . 000
12
3
0
(COM)
FS
FS - 3/2LSB
FS = VREF + VCOM
ZS = VCOM
INPUT VOLTAGE (LSB)
1 LSB =
VREF
4096
Figure 14. Unipolar Transfer Function, Full Scale (FS) = VREF
+ VCOM, Zero Scale (ZS) = VCOM
011 . . . 111
011 . . . 110
000 . . . 010
000 . . . 001
000 . . . 000
111 . . . 111
111 . . . 110
111 . . . 101
100 . . . 001
100 . . . 000
- FS
COM*
INPUT VOLTAGE (LSB)
OUTPUT CODE
ZS = COM
+FS - 1LSB
*VCOM
VREF / 2
+ VCOM
FS =
VREF
2
-FS =
+ VCOM
-VREF
2
1 LSB =
VREF
4096
≤
Figure 15. Bipolar Transfer Function, Full Scale (FS) =
VREF / 2 + VCOM, Zero Scale (ZS) = VCOM
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相关代理商/技术参数 |
参数描述 |
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| 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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