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参数资料
| 型号： | MAX157ACPA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | IC ADC 10BIT 108KSPS 2CH 8-DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 位数： | 10 |
| 采样率（每秒）： | 108k |
| 数据接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 727mW |
| 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： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
| 输入数目和类型： | 2 个单端，单极 |
MAX157/MAX159
+2.7V, Low-Power, 2-Channel,
108ksps, Serial 10-Bit ADCs in 8-Pin MAX
10
______________________________________________________________________________________
Output Data Format
Table 1 illustrates the 16-bit, serial data-stream output
format for both the MAX157 and MAX159. The first three
bits are always logic high (including the EOC bit for
internal clock mode), followed by the channel identifica-
tion (CHID = 0 for CH0, CHID = 1 for CH1, CHID = 1 for
MAX159), the 10 bits of data in MSB first format, and
two sub-LSB bits (S1 and S0). After the last bit has been
read out, additional SCLK pulses will clock out trailing
zeros. DOUT transitions on the falling edge of SCLK.
The output remains high impedance when CS/SHDN is
high.
External Reference
An external reference is required for both the MAX157
and MAX159. At REF, the DC input resistance is a mini-
mum of 18k
. During a conversion, a reference must
be able to deliver 250A of DC load current and have
an output impedance of 10
or less. Use a 0.1F
bypass capacitor for best performance. The reference
input structure allows a voltage range of 0 to (VDD +
50mV) although noise levels will decrease effective res-
olution at lower reference voltages.
Automatic Power-Down Mode
Whenever the MAX157/MAX159 are not selected
(CS/SHDN = VDD), the parts enter their shutdown mode.
In shutdown all internal circuitry is turned off, which
reduces the supply current to typically less than 0.2A.
With an external reference stable to within 1LSB, the
wake-up time is 2.5s. If the external reference is not sta-
ble within 1LSB, the wake-up time must be increased to
allow the reference to stabilize.
Applications Information
Signal-to-Noise Ratio (SNR)
For a waveform perfectly reconstructed from digital
samples, SNR is the ratio of full-scale analog input
(RMS value) to the RMS quantization error (residual
error). The ideal, theoretical minimum analog-to-digital
noise is caused by quantization error only and results
directly from the ADC’s resolution (N bits):
SNR(MAX) = (6.02 N + 1.76)dB
In reality, there are other noise sources besides quanti-
zation noise: thermal noise, reference noise, clock jitter,
DOUT
D7
D8
MSB
CHID
SAMPLING INSTANT
HIGH-Z
D6
D5
D4
D3
D2
D1
D0
S1
S0
HIGH-Z
SCLK
678
9
10
11
12
3
4
5
12
13
14
15
16
tWAKE
(tACQ)
tCS
POWER
DOWN
ACTIVE
CS/SHDN
Figure 6. External Clock Mode Timing
CS/SHDN
SCLK
DOUT
tCL
tDV
HIGH-Z
tCH
tCS
tDO
tTR
tSCLKS
Figure 7. Detailed Serial-Interface Timing Sequence
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX157ACPA+ | 功能描述:模数转换器 - ADC 10-Bit 2Ch 108ksps 5.25V 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 |
| MAX157ACUA | 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 |
| MAX157ACUA+ | 功能描述:模数转换器 - ADC 10-Bit 2Ch 108ksps 5.25V 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 |
| MAX157ACUA+T | 功能描述:模数转换器 - ADC 10-Bit 2Ch 108ksps 5.25V 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 |
| MAX157ACUA-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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