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参数资料
| 型号： | MAX1284-MAX1285 |
| 厂商： | Maxim Integrated Products, Inc. |
| 元件分类： | ADC |
| 英文描述： | Enhanced Product 1.5 Degrees C Accurate Digital Temperature Sensor W/Spi Interface 6-SOT-23 -40 to 125 |
| 中文描述： | 400ksps/300ksps，单电源，低功耗，串行12的内部参考位ADC |
| 文件页数： | 8/15页 |
| 文件大小： | 210K |
| 代理商： | MAX1284-MAX1285 |
Detailed Description
Converter Operation
The MAX1284/MAX1285 use an input T/H and succes-
sive-approximation register (SAR) circuitry to convert
an analog input signal to a digital 12-bit output. Figure
3 shows the MAX1284/MAX1285 in its simplest configu-
ration. The internal reference is trimmed to +2.5V. The
serial interface requires only three digital lines (SCLK,
CS
,
and DOUT) and provides an easy interface to
microprocessors (μPs).
The MAX1284/MAX1285 have two modes: normal and
shutdown. Pulling
SHDN
low shuts the device down and
reduces supply current to below 2μA (typ), while pulling
SHDN
high puts the device into operational mode. Pulling
CS
low initiates a conversion that is driven by SCLK. The
conversion result is available at DOUT in unipolar serial
format. The serial data stream consists of three zeros,
followed by the data bits (MSB first). All transitions on
DOUT occur 20ns after the rising edge of SCLK. Figures
8 and 9 show the interface timing information.
Analog Input
Figure 4 illustrates the sampling architecture of the
ADC
’
s comparator. The full-scale input voltage is set by
the internal reference (V
REF
= +2.5V).
Track/Hold
In track mode, the analog signal is acquired and stored
in the internal hold capacitor. In hold mode, the T/H
switch opens and maintains a constant input to the
ADC
’
s SAR section.
During acquisition, the analog input (AIN) charges
capacitor C
HOLD
. Bringing
CS
low, ends the acquisition
interval. At this instant, the T/H switches the input side
of C
HOLD
to GND. The retained charge on C
HOLD
rep-
resents a sample of the input, unbalancing node ZERO
at the comparator
’
s input.
In hold mode, the capacitive digital-to-analog converter
(DAC) adjusts during the remainder of the conversion
cycle to restore node ZERO to 0 within the limits of 12-
bit resolution. This action is equivalent to transferring a
charge from C
HOLD
to the binary-weighted capacitive
DAC, which in turn forms a digital representation of the
analog input signal. At the conversion
’
s end, the input
M
400ksps/300ksps, Single-Supply, Low-Power,
Serial 12-Bit ADCs with Internal Reference
8
_______________________________________________________________________________________
DOUT
DOUT
6k
DGND
C
LOAD
= 20pF
C
LOAD
= 20pF
6k
DGND
V
DD
b)
High-Z to V
OL
and V
OH
to V
OL
a)
High-Z to V
OH
and V
OL
to V
OH
Figure 1. Load Circuits for DOUT Enable Time
DOUT
DOUT
6k
DGND
C
LOAD
= 20pF
C
LOAD
= 20pF
6k
DGND
V
DD
b)
V
OL
to High-Z
a)
V
OH
to High-Z
Figure 2. Load Circuits for DOUT Disable Time
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1284BCSA | 400ksps/300ksps, Single-Supply, Low-Power, Serial 12-Bit ADCs with Internal Reference |
| MAX1284BESA | 400ksps/300ksps, Single-Supply, Low-Power, Serial 12-Bit ADCs with Internal Reference |
| MAX1285 | 400ksps/300ksps, Single-Supply, Low-Power, Serial 12-Bit ADCs with Internal Reference |
| MAX1286 | 150ksps, 12-Bit, 2-Channel Single-Ended, and 1-Channel True-Differential ADCs in SOT23 |
| MAX1287EKA | PLASTIC ENCAPSULATED DEVICES |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1285BCSA | 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 |
| 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 |
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