In-Depth Analysis of High-Precision ΔΣ Analog-to-Digital Converters

^{V. Package Pin Configuration DescriptionSeptember 5, 2025 News — With the increasing demand for precision measurement in industrial automation and IoT applications, high-resolution analog-to-digital converters have become core components of various sensing systems. The ADS1230IPWR 24-bit ΔΣ analog-to-digital converter, with its exceptional noise performance and low-power characteristics, is providing reliable signal conversion solutions for precision weighing, pressure detection, and industrial measurement applications. The device supports a wide power supply range of 2.7V to 5.3V, integrates a programmable gain amplifier and internal oscillator, and achieves up to 23.5 effective bits at a 10SPS output rate.}

^{1.High-Precision Conversion Performance
The ADS1230IPWR utilizes advanced ΔΣ modulation technology to deliver 24-bit no-missing-code accuracy. At a 10SPS data output rate, it achieves 23.5 effective bits of resolution, meeting the stringent requirements of precision weighing and pressure measurement applications. The device's built-in low-noise PGA ensures signal integrity during small-signal amplification.} 

^{2.Integrated Design
This ADC integrates a complete measurement front-end, including a programmable gain amplifier, second-order ΔΣ modulator, and digital filter. The internal oscillator eliminates the need for external clock components, further simplifying system design. The device also provides additional features such as a temperature sensor and power-down mode.}

^{3.Low-Power Characteristics
Utilizing a proprietary low-power architecture, it consumes only 1.3mW typically at a 5V supply voltage. Supports multiple power-saving modes, including standby and power-down modes, significantly extending runtime in battery-powered applications.}

^{According to the manufacturer's test data, the ADS1230IPWR demonstrates excellent noise performance under typical operating conditions. The test conditions are: ambient temperature +25°C, analog supply voltage (AVDD) and digital supply voltage (DVDD) both at 5V, reference voltage (REFP) at 5V, and reference negative (REFN) connected to analog ground (AGND).}

^{Noise Performance Analysis
Figure 1: Noise Performance at 10SPS Data Rate}

^{Gain Setting: PGA = 64}

^{Data Output Rate: 10SPS}

^{Noise Performance: Output code fluctuation remains within ±2 LSB}

^{Feature: Extremely high stability in low-speed sampling mode, suitable for high-precision measurement applications}

^{Figure 2: Noise Performance at 80SPS Data Rate}

^{Gain Setting: PGA = 64}

^{Data Output Rate: 80SPS}

^{Noise Performance: Output code fluctuation is approximately ±4 LSB}

^{Feature: Maintains good noise performance even at higher sampling rates, meeting rapid measurement requirements}

^{Performance Summary}

^{The device exhibits excellent noise characteristics at the high gain setting of PGA=64, whether at 10SPS or 80SPS data rates.}

^{The 10SPS mode demonstrates superior noise performance, making it ideal for applications with extremely high precision requirements.}

^{The 80SPS mode provides a good balance between speed and accuracy, suitable for applications requiring faster sampling rates.}

^{Test data confirms the device's reliability and stability in precision measurement applications.}

^{These characteristics make the ADS1230IPWR particularly suitable for applications requiring high-precision analog-to-digital conversion, such as electronic scales, pressure sensors, and industrial process control.}

^{1.Signal Processing Channel}

^{Differential Input: AINP/AINN directly connect to sensor signals}

^{Programmable Gain: 64/128× gain options to optimize small-signal amplification}

^{High-Precision Conversion: ΔΣ modulator achieves 24-bit no-missing-code conversion}

^{2.Reference and Clock}

^{Reference Input: REFP/REFN support external reference sources}

^{Clock System: Built-in oscillator supports selectable 10/80SPS rates}

3.Power Design

Independent Power Supply: AVDD (Analog) and DVDD (Digital) with separate power inputs

Ground Separation: AGND and DGND with independent grounding to reduce noise interference

^{4.Core Advantages}

^{High Integration: Reduces external component requirements}

^{Low-Noise Design: Noise < ±2 LSB at PGA=64}

^{Low-Power Operation: Typical power consumption of 1.3mW}

^{Flexible Configuration: Programmable gain and data rate}

^{This architecture provides a complete front-end solution for precision measurement, particularly suitable for weighing and pressure detection applications.}

^{Circuit Structure Description}
 

^{The ADS1230IPWR adopts a differential reference voltage input design, comprising two main input terminals:}

Core Design Features

^{1.High-Impedance Input:}

^{Reference inputs feature high-impedance design}

^{Minimizes loading effects on the reference source}

^{Ensures reference voltage stability}

^{2.Differential Architecture Advantages:}

^{Suppresses common-mode noise interference}

^{Improves reference voltage noise rejection ratio}

^{Supports floating reference applications}

^{3.Decoupling Requirements}

^{A decoupling capacitor must be configured between REFP and REFN}

^{Recommended: 10μF tantalum capacitor in parallel with a 100nF ceramic capacitor}

^{Effectively suppresses power supply noise}

^{Operating Characteristics}

^{Input Range: The reference voltage difference (REFP - REFN) determines the ADC full scale}

^{Impedance Characteristic: Typical input impedance >1MΩ}

^{Temperature Drift Impact: Reference source temperature drift directly affects conversion accuracy}

^{Power Management Pins:}

^{Pin 1 (DVDD): Digital power supply positive terminal. Operating voltage range: 2.7-5.3V}

^{Pin 2 (DGND): Digital ground}

^{Pin 12 (AVDD): Analog power supply positive terminal. Operating voltage range: 2.7-5.3V}

^{Pin 11 (AGND): Analog ground}

^{Analog Interface Pins:}

^{Pin 7 (AINP): Analog signal non-inverting input}

^{Pin 8 (AINN): Analog signal inverting input}

^{Pin 10 (REFP): Reference voltage positive input}

^{Pin 9 (REFN): Reference voltage negative input}

^{Pins 5-6 (CAP): Reference decoupling capacitor connection}

^{Package Characteristics}

^{Type: TSSOP-16}

^{Pin Pitch: 0.65mm}

^{Dimensions: 5.0×4.4mm}

^{Temperature Range: -40℃ to +105℃}

^{Design Key Points}

^{Analog/digital power supplies require independent power sources}

^{Reference sources should adopt low-noise design}

^{Recommend parallel connection of 0.1μF decoupling capacitors to AVDD/DVDD pins}

^{Analog traces should be kept away from digital signal paths}

^{This configuration provides a complete interface solution for high-precision ADC applications, particularly suitable for weighing systems and sensor measurement applications.}

^{Bypass Capacitor Filter Circuit}

^{The device constructs a low-pass filter using an external capacitor and an internal resistor:}

^{1.External Component: 0.1μF bypass capacitor (C_EXT)}

^{2.Internal Structure: Integrated 2kΩ resistor (R_INT)}

^{3.Filter Characteristics: Forms a first-order low-pass filter}

^{4.Cutoff Frequency: Calculated as}

^{5.fc=12πRINTCEXT≈796Hzfc​=2πRINT​CEXT​1​≈796Hz}

^{6.Functional Role: Effectively suppresses high-frequency noise and improves analog signal quality}

^{Programmable Gain Amplifier (PGA) Architecture}

^{The PGA adopts a fully differential design structure:}

^{1.Input Method: Supports differential signal input}

^{2.Gain Configuration: Gain multiplier selected via external pins}

^{3.Signal Processing: Utilizes chopper stabilization technology to reduce offset voltage}

^{4.Noise Optimization: Built-in filtering network to optimize noise performance}

^{Operating Characteristics}

^{The low-pass filter effectively suppresses high-frequency noise ≥800Hz}

^{The PGA provides high common-mode rejection ratio (CMRR)}

^{The overall architecture significantly improves signal chain noise performance}

^{Suitable for weak signal amplification scenarios such as load cell applications}

^{Design Recommendations}

^{Use ceramic capacitors with stable temperature characteristics}

^{Minimize capacitor lead length}

^{Recommend X7R or X5R dielectric capacitors}

^{Place capacitors as close as possible to device pins during layout}

^{Circuit Structure Composition
The clock system adopts a dual-mode design architecture, comprising the following main modules:}

^{Internal Oscillator}

^{Core Frequency: 76.8kHz RC oscillator}

^{Enable Control: Activated/deactivated via EN signal}

^{Automatic Detection: CLK_DETECT module monitors clock status}

^{External Clock Interface}

^{Input Pin: CLKIN supports external clock input}

^{Compatibility: Compatible with square wave or sine wave clock sources}

^{Level Requirements: CMOS/TTL level compatible}

^{Selection Switch}

^{Multiplexer (MUX): S0 control signal selects the channel}

^{Switching Logic: Selects internal or external clock source based on configuration}

^{Output Path: Transmits the selected clock to the ADC converter}

Operating Modes

Configuration Method

Controlled via a dedicated configuration register:

• ^{S0 Control Bit: Selects clock source (0 = internal, 1 = external)}
• ^{EN Enable Bit: Internal oscillator enable control}
• ^{Status Detection: CLK_DETECT provides clock status monitoring}

^{Design Recommendations}

• ^{When using an external clock, it is recommended to add a buffer}
• ^{Clock traces should be kept away from analog signal paths}
• ^{A small coupling capacitor should be added to the CLKIN pin}
• ^{For precise timing requirements, an external crystal oscillator can be used}

^{​This clock architecture provides a flexible and stable clock solution for the ADC, meeting both the convenience needs of general applications and the external clock synchronization requirements of high-precision applications.}

• ^{For procurement or further product information, please contact:86-0775-13434437778,}

^{Or visit the official website:https://mao.ecer.com/test/icsmodules.com/,Visit the ECER product page for details: [链接]}