高精度ADS1282数据采集芯片手册：4th-Order ΔΣ模数转换器与特性详解
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"ADS1282是一款高性能、高分辨率的单芯片模拟到数字转换器(ADC)，具有卓越的特性，适用于对精度、噪声抑制和线性度有极高要求的应用。这款数据采集芯片的主要特点包括：
1. **高分辨率**：ADS1282在高分辨率模式下，能够达到惊人的-130分贝信噪比(SNR)在250个样本每秒(250 SPS)的条件下工作，表现出极高的测量精度。而在低功耗模式下，SNR依然保持在-127分贝，确保了在能源效率方面的优秀表现。
2. **内置低噪声可编程增益放大器(PGA)**：集成的PGA允许用户根据应用需求调整信号放大，同时保持低噪声特性，这对于需要精确信号处理的领域如勘探和地震监测至关重要。
3. **双通道输入多路复用器(MUX)**：该芯片支持两个独立输入通道，使得它可以同时采集并处理多个信号源，提高了数据采集的灵活性和效率。
4. **第四代ΔΣ(δ-σ)调制器**：采用的内置稳定结构，确保了出色的一致性和稳定性，以及-120分贝的总谐波失真(THD)，这有助于减少量化噪声，提高信号质量。
5. **低功耗设计**：ADS1282通过低功耗模式提供节能选项，适合对电池供电或能源有限的设备。
6. **接口兼容性**：它具备标准的串行外设接口(SPI)，简化了与微控制器和其他数字逻辑器件的连接。
7. **校准控制**：内置的校准功能允许用户进行自校准，确保长期的精度保持。
8. **电源管理**：包括电源上电/下电控制、时钟同步、复位和电源电压选项，有助于优化功耗和系统设计。
9. **过载保护**：过范围模ulatorOutput提供了保护机制，防止输入信号超出传感器的最大范围导致损坏。
ADS1282凭借其高精度、低噪声、灵活的输入配置和节能特性，成为工业自动化、信号处理、测试测量等领域的理想选择。通过结合这些特性，工程师们能够构建出性能强大且可靠性高的数据采集系统。"
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PRODUCTPREVIEW
ANALOG INPUTS AND MULTIPLEXER
AVSS 0.7V<(AINNorAINP)<AVDD 1.25V- -
(1)
NOISE PERFORMANCE
IDLE TONES
OPERATING MODE
S
1
S
2
S
3
S
4
S
5
S
6
AINP1
AINP2
AINN2
AINN1
AVSS
AVDD
S
7
(+)
( )-
ToPGA
AVDD+AVSS
2
400W
400W
ADS1282
SBAS418A – SEPTEMBER 2007 – REVISED DECEMBER 2007
The RESET input resets the register settings and
also restarts the conversion process. The PWDN
A diagram of the input multiplexer is shown in
input sets the device into a micro-power state. Note
Figure 2 . The specified input operating range of the
that register settings are not retained in PWDN mode.
inputs are shown in Equation 1 :
Use the STANDBY command in its place if it is
desired to retain register settings (the quiescent
current in the Standby mode is slightly higher).
ESD diodes protect the multiplexer inputs. If either
input is taken below AVSS – 0.3V or above AVSS +
Noise-immune Schmitt-trigger and clock-qualified
0.3V, the ESD protection diodes may turn on. If these
inputs ( RESET and SYNC) provide increased
conditions are possible, external Schottky clamp
reliability in high-noise environments. The serial
diodes and/or series resistors may be required to limit
interface is used to read conversion data, in addition
the input current to safe values (see the Absolute
to reading and writing to the configuration registers.
Maximum Ratings table).
The ADS1282 offers outstanding noise performance
(SNR). SNR depends on the data rate and the PGA
setting. As the bandwidth is decreased by decreasing
the data rate, the SNR improves correspondingly.
Table 1 summarizes the typical noise performance
with inputs shorted.
The ADS1281 modulator incorporates an internal
dither signal that randomizes the idle tone energy.
Low-level idle tones may still be present, typically
– 137dB below full-scale. The low-level idle tones can
be shifted out of the passband with the application of
an external 20mV offset.
For applications where minimal power consumption is
important, the low-power mode can be selected
(register bit MODE = 0). In low-power mode, the
power is reduced from 27mW to 17mW and SNR
Figure 2. Analog Inputs and Multiplexer
degrades by 3dB.
Table 1. Noise Performance (Typical
(1)
)
PGA (High-Resolution Mode) PGA (Low-Power Mode)
DATA RATE
(SPS) 1 2 4 8 16 32 64 1 2 4 8 16 32 64
250 130 130 129 128 125 119 114 127 127 126 125 122 116 111
500 127 127 126 125 122 116 111 124 124 123 122 119 113 108
1000 124 124 123 122 119 113 108 121 121 120 119 116 110 105
2000 121 121 120 119 116 111 106 118 118 117 116 113 108 103
4000 118 118 117 116 113 108 103 115 115 114 113 110 105 100
(1) V
IN
= 20mV
DC
.
8 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): ADS1282
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