参数资料
| 型号： | MAX1271BEAI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 8CH 28-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 46 |
| 类型： | 数据采集系统（DAS），ADC |
| 分辨率（位）： | 12 b |
| 采样率（每秒）： | 110k |
| 数据接口： | 串行 |
| 电压电源： | 单电源 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 1396 (CN2011-ZH PDF) |
MAX1270/MAX1271
Multirange, +5V, 8-Channel,
Serial 12-Bit ADCs
______________________________________________________________________________________
15
Internal Reference
The internally trimmed 2.50V reference is amplified
through the REFADJ buffer to provide 4.096V at REF.
Bypass REF with a 4.7F capacitor to AGND and
REFADJ with a 0.01F capacitor to AGND (Figure 13a).
The internal reference voltage is adjustable to ±1.5%
(±65 LSBs) with the reference-adjust circuit of Figure 1.
External Reference
To use the REF input directly, disable the internal buffer
by tying REFADJ to VDD (Figure 13b). Using the
REFADJ input eliminates the need to buffer the refer-
ence externally. When a reference is applied at
REFADJ, bypass REFADJ with a 0.01F capacitor to
AGND. Note that when an external reference is applied
at REFADJ, the voltage at REF is given by:
VREF = 1.6384 x VREFADJ (2.4 < VREF < 4.18)
(Figure 13c). At REF and REFADJ, the input impedance
is a minimum of 10k for DC currents. During conver-
sions, an external reference at REF must be able to deliv-
er 400A DC load currents and must have an output
impedance of 10 or less. If the reference has higher
output impedance or is noisy, bypass REF with a 4.7F
capacitor to AGND as close to the chip as possible.
With an external reference voltage of less than 4.096V
at REF or less than 2.5V at REFADJ, the increase in the
ratio of RMS noise to the LSB value (full-scale / 4096)
results in performance degradation (loss of effective
bits).
CS
SCLK
DIN
DOUT
A/D STATE
1
8
9
24
22
14
16
START SEL2 SEL1 SEL0
BIP
RNG
PD1 PD0
D11 D10 D9
D7
D8
D6 D5
D4
D2
D3
D1 D0
START SEL2 SEL1 SEL0
BIP
RNG
PD1 PD0
START
SEL0
SEL1
SEL2
CONTROL BYTE
RESULT
CONTROL BYTE 1
CONTROL BYTE 2
13 SCLK
SSTRB
D10
D11
D9
D8
D6
D7
D5
D4
D3
RESULT 1
ACQUISITION CONVERSION
ACQUISITION
CONVERSION
HIGH-Z
Figure 11. Internal Clock Mode—13 Clocks/Conversion Timing
CS
SCLK
DIN
DOUT
A/D STATE
IDLE
9
24
25
32
16
17
START
SEL2 SEL1 SEL0
BIP
RNG
PD1 PD0
D11 D10 D9
D7
D8
D6
D5
D4
D2
D3
D1 D0
START SEL2 SEL1 SEL0
BIP
RNG
PD1 PD0
CONTROL BYTE
RESULT
CONTROL BYTE 1
CB 2
16 SCLK
SSTRB
D10
D11
D9
D8
D6
D7
D5
D4
D3
RESULT 1
ACQUISITION CONVERSION
HIGH-Z
1
8
Figure 12. Internal Clock Mode—16 Clocks/Conversion Timing
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1271BEAI+ | 功能描述:模数转换器 - ADC 12-Bit 8Ch 110ksps 4.18V 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 |
| MAX1271BEAI+T | 功能描述:模数转换器 - ADC 12-Bit 8Ch 110ksps 4.18V 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 |
| MAX1271BEAI-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 |
| MAX1271BENG | 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 |
| MAX1271BENG+ | 功能描述:模数转换器 - ADC 12-Bit 8Ch 110ksps 4.18V 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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