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参数资料
| 型号： | MAX1285BCSA |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | ADC |
| 英文描述： | 400ksps/300ksps, Single-Supply, Low-Power, Serial 12-Bit ADCs with Internal Reference |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8 |
| 封装： | 0.150 INCH, MS-012AA, SOIC-8 |
| 文件页数： | 12/15页 |
| 文件大小： | 210K |
| 代理商： | MAX1285BCSA |
M
400ksps/300ksps, Single-Supply, Low-Power,
Serial 12-Bit ADCs with Internal Reference
12
______________________________________________________________________________________
SCLK to DOUT valid timing characteristic. Data can be
clocked into the μP on SCLK rising edge.
3) Pull
CS
high at or after the 15th rising clock edge. If
CS
remains low, trailing zeros are clocked out after the
LSB.
4) With
CS
= high, wait the minimum specified time, t
CS,
before initiating a new conversion by pulling
CS
low. If
a conversion is aborted by pulling
CS
high before the
conversion completes, wait for the minimum acquisition
time, t
ACQ
, before starting a new conversion.
CS
must be held low until all data bits are clocked out.
Data can be output in two bytes or continuously, as
shown in Figure 8. The bytes contain the result of the
conversion padded with three leading zeros and three
trailing zeros.
SPI and MICROWIRE
When using SPI or MICROWIRE, set CPOL = 0 and
CPHA = 0. Conversion begins with a
CS
falling edge.
DOUT goes low, indicating a conversion in progress. Two
consecutive 1-byte reads are required to get the full
twelve bits from the ADC. DOUT output data transitions
on SCLK
’
s rising edge and is clocked into the following
μP on the rising edge.
The first byte contains three leading zeros, and five bits of
conversion result. The second byte contains the remaining
seven bits and one trailing zero. See Figure 11 for con-
nections and Figure 12 for timing.
QSPI
Unlike SPI, which requires two 1-byte reads to acquire
the 12 bits of data from the ADC, QSPI allows the mini-
mum number of clock cycles necessary to clock in the
data. The MAX1284/MAX1285 require 15 clock cycles
from the μP to clock out the 12 bits of data. Figure 13
shows a transfer using CPOL = 0 and CPHA = 1. The
conversion result contains two zeros followed by the 12
bits of data in MSB-first formatted.
Layout, Grounding, and Bypassing
For best performance, use PC 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 digital (especially clock)
lines parallel to one another, or digital lines underneath
the ADC package.
11
…
111
11
…
110
11
…
101
00
…
011
00
…
010
00
…
001
00
…
000
0
1
2
FS
OUTPUT CODE
FS - 3/2LSB
INPUT VOLTAGE (LSBs)
FS = V
REF
- 1LSB
1LSB = V
REF
4096
FULL-SCALE
TRANSITION
3
Figure 10. Unipolar Transfer Function, Full Scale (FS) =
V
REF
- 1LSB, Zero Scale (ZS) = GND
CS
SCLK
DOUT
I/O
SCK
MISO
+3V TO +5V
SS
a) SPI
CS
SCLK
DOUT
CS
SCK
MISO
+3V TO +5V
SS
b) QSPI
MAX1284
MAX1285
MAX1284
MAX1285
MAX1284
MAX1285
CS
SCLK
DOUT
I/O
SK
SI
c) MICROWIRE
Figure 11. Common Serial-Interface Connections to the
MAX1284/MAX1285
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1285BCSA+ | 功能描述:模数转换器 - ADC 12-Bit 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 |
| MAX1285BCSA+T | 功能描述:模数转换器 - ADC 12-Bit 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 |
| MAX1285BCSA-T | 功能描述:模数转换器 - ADC Integrated Circuits (ICs) 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 |
| MAX1285BESA | 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 |
| MAX1285BESA+ | 功能描述:模数转换器 - ADC 12-Bit 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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