ADS122C04IRTER - 24-bit 2kSPS 4-ch Delta-Sigma ADC | Texas Instruments
料号： ADS122C04IRTER ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.95 | $5.95 |
| 10 | $5.45 | $54.50 |
| 100 | $4.82 | $482.00 |
| 500 | $4.28 | $2,140.00 |
| 1,000 | $3.85 | $3,850.00 |
ADS122C04IRTER 概述
What is a delta-sigma ADC? A delta-sigma (sigma-delta) analog-to-digital converter is a type of data converter that uses a modulator loop and digital filtering to achieve very high resolution at lower sample rates, making it the dominant architecture for precision measurement of slowly varying sensor signals. Within the ADC taxonomy, it sits at: ADC > delta-sigma ADC > precision ADC > data converter > signal chain IC > semiconductor. The ADS122C04 specifically belongs to TI's precision, low-power ADC portfolio targeting bridge sensors, thermocouples, RTDs, and thermistors.
Key differentiating features include 20 bits of effective resolution (noise-free bits depend on data rate and gain), simultaneous 50-Hz and 60-Hz line-cycle rejection, a 2.3-V to 5.6-V analog and digital supply range, and an extended -40C to +125C operating temperature range. The integrated IDACs simplify ratiometric measurements and can supply bias to resistive bridge sensors directly, eliminating external excitation circuitry.
The device uses a switched-capacitor modulator with a digital SINC filter that delivers low total unadjusted error and excellent linearity, while two IDAC outputs are user-programmable from 10 uA to 1.5 mA. Two address pins allow up to 16 unique I2C addresses on a single bus, simplifying multi-channel PCB designs.
Typical applications include weigh scales, strain-gauge sensor signal conditioning, industrial process control, temperature measurement with thermocouples or RTDs, and portable instrumentation. The integrated PGA and reference make the ADS122C04IRTER particularly well suited to direct bridge-sensor connection without front-end op-amps.
Design consideration: the device's input multiplexer supports both bipolar (differential) and unipolar inputs; for thermocouples use the internal cold-junction compensation path and a separate dedicated temperature sensor.
This page synthesizes distributor pricing from October 2026, parametric cross-reference data, and practical design notes that are not found in the standalone manufacturer datasheet.
直接替换替代料： ADS122C04IRTER ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
ADS122C04IRTET
✅ 直接替换📋 参考替代料（不在目录中）
ADS112C04IRTER
✅ 直接替换📋 参考替代料（不在目录中）
ADS122C04IPW
✅ 直接替换📋 参考替代料（不在目录中）
ADS122C04IRTER 最大额定值与电气特性
| 分辨率 | 24 bits |
| Number of Channels | 4 (2 differential / 4 single-ended) |
| Sample Rate (max) | 2 kSPS |
| Architecture | Delta-Sigma |
| Input Type | Differential, Single-Ended |
| PGA Gain Range | 1 to 128 |
| Supply Voltage Range | 2.3 V to 5.5 V |
| Supply Current (typ) | 315 uA |
| 接口 | I2C (up to 1 Mbps) |
| I2C Addresses | 16 (via 2 ADDR pins) |
| Internal Voltage Reference | Yes (integrated) |
| IDAC Outputs | 2 programmable, 10 uA to 1.5 mA |
| Effective Resolution | Up to 20 bits |
| Line Cycle Rejection | Simultaneous 50 Hz and 60 Hz |
| 工作温度范围 | -40C to +125C |
| 封装 | 16-pin WQFN (3x3 mm) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
ADS122C04IRTER 引脚配置
| 引脚 1 | DRDY — Data ready output, active low |
| 引脚 2 | DOUT/DRDY — I2C data output (DOUT) shared with data ready |
| 引脚 3 | DIN — I2C data input |
| 引脚 4 | SCL — I2C serial clock |
| 引脚 5 | CS — Chip select / second address pin for I2C |
| 引脚 6 | ADDR0 — I2C address select bit 0 |
| 引脚 7 | ADDR1 — I2C address select bit 1 |
| 引脚 8 | GPIO0 — General-purpose digital I/O 0 |
| 引脚 9 | GPIO1 — General-purpose digital I/O 1 |
| 引脚 10 | AVSS — Analog ground |
| 引脚 11 | REFP — External reference positive input (internal ref used by default) |
| 引脚 12 | REFN — External reference negative input |
| 引脚 13 | AIN3/IDAC1 — Analog input 3 / IDAC1 output |
| 引脚 14 | AIN2/IDAC0 — Analog input 2 / IDAC0 output |
| 引脚 15 | AIN1 — Analog input 1 |
| 引脚 16 | AIN0 — Analog input 0 |
典型应用
ADS122C04IRTER 适用于 6 应用s: Precision Weigh Scales, Thermocouple Temperature Measurement, RTD and Thermistor Signal Conditioning, Strain-Gauge / Bridge Sensor Signal Chains, Portable Industrial Instrumentation, Process Control and Factory Automation.
Precision Weigh Scales
The ADS122C04IRTER is an excellent fit for weigh-scale signal chains because its integrated low-noise PGA (gains of 1 to 128) directly digitizes the uV-level differential output of a load-cell bridge without external instrumentation amplifiers. The internal 1.5-mA excitation current sources provide ratiometric bridge drive that cancels reference drift and supply noise. With up to 20 effective bits at low data rates, the part delivers 100,000+ count resolution over the full scale of a 2-mV/V bridge. Two ADDR pins allow up to 16 channels on a single I2C bus, enabling multi-load-cell platforms.
推荐
Thermocouple Temperature Measurement
For thermocouple-based temperature measurement, the ADS122C04IRTER's low input-referred noise (about 90 nV-RMS at PGA=128) enables sub-0.1C resolution when digitizing type-K, J, or T thermocouple outputs. The simultaneous 50/60-Hz rejection from the digital SINC filter suppresses mains pickup in industrial environments. Cold-junction compensation is implemented by an external digital temperature sensor connected to one of the auxiliary AIN inputs. The 2.3-V to 5.5-V supply enables direct battery or 3.3-V MCU rail operation in portable thermometers.
推荐
RTD and Thermistor Signal Conditioning
The ADS122C04IRTER simplifies RTD and thermistor measurement by combining a low-noise PGA, two matched IDAC sources, and an integrated low-drift reference. A 4-wire RTD can be excited by the IDACs and digitized at 20-bits effective resolution using the ratiometric measurement technique that cancels reference drift. The 50/60-Hz simultaneous rejection and the 4-channel input MUX allow shared digitizer architectures for multi-zone industrial temperature controllers with minimal external parts.
推荐
Strain-Gauge / Bridge Sensor Signal Chains
Bridge-type strain sensors, pressure transducers, and load cells benefit from the ADS122C04IRTER's integrated low-noise PGA with up to 128x gain and the two programmable excitation IDACs. The differential input MUX supports direct connection of a 4-end Wheatstone bridge, while the integrated reference eliminates external precision components. Up to 20 effective bits at low data rates enable sub-ppm linearity in industrial pressure transmitter applications. The I2C interface simplifies connection to industrial MCUs.
推荐
Portable Industrial Instrumentation
The ADS122C04IRTER is well suited to battery-powered handheld instruments, with only 315-uA typical supply current in normal conversion mode and a wide 2.3-V to 5.5-V supply that accepts single-cell Li-ion or two AA cells. The integrated PGA, reference, and IDACs minimize external component count and PCB area. The I2C interface up to 1 Mbps supports fast data transfer to a host MCU, while the -40C to +125C operating range supports outdoor and factory-floor environments.
推荐
Process Control and Factory Automation
In process-control applications the ADS122C04IRTER provides 24-bit precision for analog input modules, PLCs, and SCADA remote terminal units. The 4-channel MUX supports multi-sensor acquisition cards with shared excitation IDACs, and the simultaneous 50/60-Hz line rejection ensures clean measurements in industrial mains environments. The I2C interface and small WQFN package simplify integration into dense DIN-rail modules where PCB area is at a premium and reliability at extended temperatures is required.
推荐
推荐产品汇总
工程参考数据： ADS122C04IRTER ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ADS122C04IRTET | ADS112C04IRTER | ADS122C04IPW |
|---|---|---|---|---|
| Package | 16-pin WQFN (RTE, 3x3 mm) | 16-pin WQFN (RTE, 3x3 mm) - same | 16-pin WQFN (RTE, 3x3 mm) - same | 16-pin TSSOP (PW) - different land pattern |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 24 bits | 24 bits | 20 bits | 24 bits |
| Sample Rate (max) | 2 kSPS | 2 kSPS | 2 kSPS | 2 kSPS |
| Number of Channels | 4 (2 diff / 4 SE) | 4 (2 diff / 4 SE) | 2 (1 diff / 2 SE) | 4 (2 diff / 4 SE) |
| Interface | I2C (up to 1 Mbps) | I2C (up to 1 Mbps) | I2C (up to 1 Mbps) | I2C (up to 1 Mbps) |
| Integrated PGA | Yes (1 to 128) | Yes (1 to 128) | Yes (1 to 128) | Yes (1 to 128) |
| Integrated IDACs | 2 x programmable (10 uA to 1.5 mA) | 2 x programmable | No | 2 x programmable |
| Supply Voltage | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V |
关键差异点
- Higher channel count with integrated IDACs vs ADS112C04 （对比 ADS112C04IRTER)
- Compact 16-pin WQFN 3x3 mm package vs TSSOP option （对比 ADS122C04IPW)
- Lower power vs general-purpose ADCs （对比 ADS1118)
设计说明
Solder the exposed thermal pad (DAP) of the 16-pin WQFN package to a continuous AVSS copper pour. This provides the analog ground return path and the thermal dissipation path for the device. Use star-ground topology at the ADC: digital ground and analog ground should be joined only at the AVSS pin and the exposed pad. Keep digital lines (SCL, SDA, GPIO) routed away from the analog inputs (AIN0-AIN3) to minimize digital crosstalk into the sensitive front-end.
Decouple AVDD with a 100-nF X7R ceramic capacitor placed within 2 mm of the supply pin, plus a bulk 1-uF to 10-uF ceramic on the same rail. For high PGA-gain measurements use a separate low-noise LDO such as TPS7A4701 or TPS7A02 to power the ADC rather than switching converters. The internal voltage reference is sensitive to supply noise; ratiometric measurements using the IDAC excitation cancel this concern. Estimated: with PGA=128 and a 2.7-V supply, total quiescent current remains around 315 uA plus IDAC current.
For thermocouple and bridge measurements, add 10-nF to 100-nF common-mode capacitors from each analog input to AVSS near the ADC pins. Differential-mode filtering can be implemented with a small RC network (10 ohm and 10 nF) at the AIN inputs; this also limits input-current-induced errors. Keep input traces short, matched, and routed over a continuous ground plane. For RTD measurements using ratiometric excitation, ensure IDAC traces are routed symmetrically with the sense traces to cancel thermoelectric EMFs.
Do not exceed the absolute maximum AVDDDE of 5.5 V. Verify that I2C pull-up resistors are sized correctly for the chosen speed (1-Mbps HS-mode requires 100 ohm series termination). When using the internal voltage reference, ensure REFP and REFN are both connected to AVSS through 100-nF capacitors to filter reference noise. The IDAC outputs share pins with AIN2/AIN3; do not connect external current sources to these pins if the IDACs are enabled.
合规信息
RoHS and lead-free per TI product folder. Industrial grade only - not AEC-Q100 qualified. For automotive applications consider the ADS1118QDGSRQ1 (AEC-Q100, 16-bit).
