ZHCSGS4A August 2017 – February 2020 ADS114S06B , ADS114S08B
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
- 8 Parameter Measurement Information
-
9 Detailed Description
- 9.1 Overview
- 9.2 Functional Block Diagram
- 9.3
Feature Description
- 9.3.1 Multiplexer
- 9.3.2 Low-Noise Programmable Gain Amplifier
- 9.3.3 Voltage Reference
- 9.3.4 Clock Source
- 9.3.5 Delta-Sigma Modulator
- 9.3.6 Digital Filter
- 9.3.7 Excitation Current Sources (IDACs)
- 9.3.8 Bias Voltage Generation
- 9.3.9 System Monitor
- 9.3.10 Status Register
- 9.3.11 General-Purpose Inputs and Outputs (GPIOs)
- 9.3.12 Calibration
- 9.4 Device Functional Modes
- 9.5 Programming
- 9.6
Register Map
- 9.6.1 Configuration Registers
- 9.6.2
Register Descriptions
- 9.6.2.1 Device ID Register (address = 00h) [reset = xxh]
- 9.6.2.2 Device Status Register (address = 01h) [reset = 80h]
- 9.6.2.3 Input Multiplexer Register (address = 02h) [reset = 01h]
- 9.6.2.4 Gain Setting Register (address = 03h) [reset = 00h]
- 9.6.2.5 Data Rate Register (address = 04h) [reset = 14h]
- 9.6.2.6 Reference Control Register (address = 05h) [reset = 10h]
- 9.6.2.7 Excitation Current Register 1 (address = 06h) [reset = 00h]
- 9.6.2.8 Excitation Current Register 2 (address = 07h) [reset = FFh]
- 9.6.2.9 Sensor Biasing Register (address = 08h) [reset = 00h]
- 9.6.2.10 System Control Register (address = 09h) [reset = 10h]
- 9.6.2.11 Reserved Register (address = 0Ah) [reset = 00h]
- 9.6.2.12 Offset Calibration Register 1 (address = 0Bh) [reset = 00h]
- 9.6.2.13 Offset Calibration Register 2 (address = 0Ch) [reset = 00h]
- 9.6.2.14 Reserved Register (address = 0Dh) [reset = 00h]
- 9.6.2.15 Gain Calibration Register 1 (address = 0Eh) [reset = 00h]
- 9.6.2.16 Gain Calibration Register 2 (address = 0Fh) [reset = 40h]
- 9.6.2.17 GPIO Data Register (address = 10h) [reset = 00h]
- 9.6.2.18 GPIO Configuration Register (address = 11h) [reset = 00h]
- 10Application and Implementation
- 11Power Supply Recommendations
- 12Layout
- 13器件和文档支持
- 14机械、封装和可订购信息
封装选项
请参考 PDF 数据表获取器件具体的封装图。
机械数据 (封装 | 引脚)
- RHB|32
- PBS|32
散热焊盘机械数据 (封装 | 引脚)
- PBS|32
订购信息
9.3.7 Excitation Current Sources (IDACs)
The ADS114S0xB incorporates two integrated, matched current sources (IDAC1, IDAC2). The current sources provide excitation current to resistive temperature devices (RTDs), thermistors, diodes, and other resistive sensors that require constant current biasing. The current sources are programmable to output values between 10 μA to 2000 μA using the IMAG[3:0] bits in the excitation current register 1 (06h). Each current source can be connected to any of the analog inputs AINx as well as the REFP1 and REFN1 inputs for the ADS114S06B. Both current sources can also be connected to the same pin. The routing of the IDACs is configured by the I1MUX[3:0] and I2MUX[3:0] bits in the excitation current register 2 (07h). In three-wire RTD applications, the matched current sources can be used to cancel errors caused by sensor lead resistance (see the Typical Application section for more details). Figure 63 details the IDAC connection through the input multiplexer.
Figure 63. IDAC Block Diagram The internal reference must be enabled for IDAC operation. As with any current source, the IDAC requires voltage headroom to the positive supply to operate. This voltage headroom is the compliance voltage. When driving resistive sensors and biasing resistors, take care not to exceed the compliance voltage of the IDACs, otherwise the specified accuracy of the IDAC current may not be met. For IDAC compliance voltage specifications, see the Electrical Characteristics table.