ADS1213EG4 - 22-bit Delta-Sigma ADC, 4-Ch, SPI | Texas Instruments
料号： ADS1213EG4 ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.75 | $1,375.00 |
| 500 | $11.4 | $5,700.00 |
| 1,000 | $9.85 | $9,850.00 |
ADS1213EG4 概述
A delta-sigma ADC (also called sigma-delta or oversampling converter) is a converter architecture that trades raw speed for resolution by oversampling the input and using digital filtering to shape quantization noise out of the signal band. Within the broader hierarchy, a delta-sigma ADC is a subset of precision ADC > data converter > signal chain IC > semiconductor. Delta-sigma ADCs dominate high-resolution, low-frequency measurement because their inherent noise shaping rejects broadband noise that would otherwise limit resolution.
Key features of the ADS1213EG4 include a programmable gain amplifier with gain settings from 1 to 16, a synchronous SPI-compatible serial interface with optional two-wire mode for galvanic isolation, differential input architecture for direct transducer connection, and an internal 4-channel input multiplexer for multi-channel scanning. The on-chip reference and self-calibration functions remove most offset and gain errors at the system level, simplifying firmware burden.
The device uses a fourth-order delta-sigma modulator with a switched-capacitor front end, followed by a decimation-by-64 to 2048 digital filter. Effective resolution is a function of data rate, PGA gain, and reference voltage, so designers should consult the ADS1212/ADS1213 datasheet noise tables when matching dynamic range to a target transducer output.
Typical applications include industrial process control weigh scales, direct thermocouple and RTD temperature measurement, multi-channel pressure transducers, instrumentation front ends, and precision sensor signal conditioning. The combination of low power, integrated PGA, and on-chip reference makes the ADS1213EG4 well suited to remote or handheld measurement nodes where PCB area is at a premium.
When designing with this part, pay close attention to analog supply decoupling and the differential input common-mode range. Use a low-thermal-EMF ground layout around the analog inputs; even a few nanovolts of stray thermocouple voltage between the input traces and the reference ground can corrupt 22-bit measurements.
This page synthesizes distributor stock and pricing, drop-in alternative cross-references, and engineering design notes that go beyond what the manufacturer datasheet alone provides, helping engineers both evaluate and qualify the ADS1213EG4 for production designs.
直接替换替代料： ADS1213EG4 ——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：
ADS1213E
✅ 直接替换📋 参考替代料（不在目录中）
ADS1213U/1K
✅ 直接替换📋 参考替代料（不在目录中）
ADS1213E/1K
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ADS1213PG4
✅ 直接替换📋 参考替代料（不在目录中）
ADS1240E
✅ 直接替换📋 参考替代料（不在目录中）
ADS1213EG4 最大额定值与电气特性
| 分辨率 | 22 bits (no missing codes) |
| Architecture | Delta-Sigma (sigma-delta) |
| Number of Input Channels | 4 differential |
| Output Data Rate (max) | 6.25 kSPS |
| Effective Resolution at 10 Hz | 20 bits |
| Effective Resolution at 1 kHz | 16 bits |
| 电源电压 | +5 V single supply |
| Supply Current / Power | 1.4 mW power dissipation |
| Programmable Gain Amplifier | 1, 2, 4, 8, 16 |
| Voltage Reference | Internal (on-chip) |
| Data Interface | SPI-compatible synchronous serial; two-wire mode |
| Input Type | Differential |
| Input Multiplexer | 4-channel |
| 封装 / 外壳 | 28-SSOP (5.30 mm width) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (G suffix, Pb-free) |
ADS1213EG4 引脚配置
| 引脚 1 | VDD — Analog +5V supply |
| 引脚 2 | VBIAS — Common-mode bias output |
| 引脚 3 | AINP1 — Analog input channel 1, positive |
| 引脚 4 | AINN1 — Analog input channel 1, negative |
| 引脚 5 | AINP2 — Analog input channel 2, positive |
| 引脚 6 | AINN2 — Analog input channel 2, negative |
| 引脚 7 | AINP3 — Analog input channel 3, positive |
| 引脚 8 | AINN3 — Analog input channel 3, negative |
| 引脚 9 | AINP4 — Analog input channel 4, positive |
| 引脚 10 | AINN4 — Analog input channel 4, negative |
| 引脚 11 | AGND — Analog ground |
| 引脚 12 | VREF — Voltage reference (internal or external) |
| 引脚 13 | REFP — Reference bypass capacitor positive |
| 引脚 14 | REFN — Reference bypass capacitor negative |
| 引脚 15 | CAP — Filter capacitor |
| 引脚 16 | XIN — Crystal oscillator input |
| 引脚 17 | XOUT — Crystal oscillator output |
| 引脚 18 | DGND — Digital ground |
| 引脚 19 | DVDD — Digital +5V supply |
| 引脚 20 | MODE — Two-wire / SPI mode select |
| 引脚 21 | SYNC — Two-wire control mode sync |
| 引脚 22 | SDIO — Serial data I/O |
| 引脚 23 | SDOUT — Serial data output |
| 引脚 24 | SCLK — Serial clock input |
| 引脚 25 | DRDY — Data ready output |
| 引脚 26 | CS — Chip select (SPI) |
| 引脚 27 | DS — Data sheet select pin / control input |
| 引脚 28 | RESET — Reset input (active low) |
典型应用
ADS1213EG4 适用于 6 应用s: Industrial Weigh Scales, Direct Thermocouple Temperature Measurement, Multi-Channel Pressure Transducer Signal Conditioning, RTD Temperature Measurement Front End, Precision Sensor Signal Conditioning, Remote / Battery-Powered Measurement Nodes.
Industrial Weigh Scales
Weigh scales depend on 20+ bit noise-free resolution at low data rates to resolve milligram-level load-cell output. The ADS1213EG4 delivers 20 bits of effective resolution at 10 Hz output data rate with a built-in programmable gain amplifier (gains 1, 2, 4, 8, 16) and on-chip reference, eliminating the need for an external instrumentation front end. Its 1.4 mW power dissipation keeps battery-powered bench scales running cool. Compared to discrete ADC + external PGA + external reference designs, the ADS1213EG4 collapses three ICs into one, cutting PCB area and BOM cost while preserving the calibration flexibility that scale OEMs need.
推荐
Direct Thermocouple Temperature Measurement
Direct thermocouple digitization needs high gain for sub-millivolt signals and strong 50/60 Hz rejection to ignore mains pickup. The ADS1213EG4's PGA provides gains up to 16 and its digital filter offers programmable first notch placement, eliminating line-frequency hum that would otherwise swamp a 22-bit conversion. On-chip reference and self-calibration functions remove the thermocouple chain's offset and gain errors at the system level. Designers typically use the differential inputs in pairs to bias one junction as a cold-junction compensation reference (CJC) while feeding the type K or type J thermocouple, getting 0.1C-class repeatability across industrial furnace ranges.
推荐
Multi-Channel Pressure Transducer Signal Conditioning
Process-control systems often digitize 2-4 pressure transducer bridges per card. The ADS1213EG4 integrates a 4-channel differential input multiplexer, so one ADS1213EG4 replaces four single-channel ADCs in a multi-loop pressure scanner. Its 22-bit no-missing-codes performance preserves 0.001% rdg accuracy even at the high end of industrial pressure ranges, and the SPI synchronous serial interface works with most digital isolators for galvanic isolation across hazardous-area barriers. The 28-SSOP footprint is compact enough to fit 8 channels of pressure scanning on a 50 x 50 mm eurocard subassembly.
推荐
RTD Temperature Measurement Front End
RTDs such as PT100 and PT1000 emit 0.385 mV/C around low millivolt bias levels, demanding both gain and ratiometric measurement. The ADS1213EG4's 22-bit core plus on-chip reference can be configured with an external reference current source to perform true ratiometric RTD measurements, cancelling the absolute errors of the excitation current. Effective resolution of 20 bits at 10 Hz output rate yields 0.01C resolution on a PT100 over a 200C span. The 4-input multiplexer lets engineers scan up to four RTDs sequentially in a multi-zone furnace or reactor wall controller.
推荐
Precision Sensor Signal Conditioning
Strain gauges, load cells, and piezoelectric sensors all benefit from the ADS1213EG4's combination of high PGA gain, on-chip reference, and differential input topology. By choosing PGA gain 16 and 10 Hz data rate, the part resolves sub-microvolt sensor outputs at 20 effective bits, while the SPI-compatible serial interface hands converted data to the host MCU with no DMA burden. Calibration registers let a factory trim offset and gain to within 100 ppm, which is critical for medical and analytical instrument OEMs that need long-term stability beyond the bare converter spec.
推荐
Remote / Battery-Powered Measurement Nodes
Wireless sensor nodes, battery-backed data loggers, and field instruments share a need for very low standby power and periodic precision measurement. The ADS1213EG4's 1.4 mW active dissipation and ability to enter standby between conversions lets a 4-channel node run for months on a 3.6 V lithium AA battery pack. The single +5V supply rail simplifies power-tree design, and the programmable gain lets one ADC cover multiple sensor types with different full-scale ranges. This is why the ADS1213EG4 is found in many telemetry, weather-station, and gas-meter AMI products.
推荐
推荐产品汇总
工程参考数据： ADS1213EG4 ——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 | ADS1213E | ADS1213U/1K | ADS1213E/1K | ADS1213PG4 | ADS1240E |
|---|---|---|---|---|---|---|
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 22 bit | 22 bit | 22 bit | 22 bit | 22 bit | 24 bit |
| Input Channels | 4 differential | 4 differential | 4 differential | 4 differential | 4 differential | 4 differential |
| Max Output Data Rate | 6.25 kSPS | 6.25 kSPS | 6.25 kSPS | 6.25 kSPS | 6.25 kSPS | 1 kSPS |
| Effective Resolution @ 10 Hz | 20 bits | 20 bits | 20 bits | 20 bits | 20 bits | 20+ bits |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single | +5 V (also 3.3 V) |
| Power Dissipation | 1.4 mW | 1.4 mW | 1.4 mW | 1.4 mW | 1.4 mW | ~1.4 mW (lower-power mode) |
| On-Chip Reference | Yes | Yes | Yes | Yes | Yes | Yes |
| Interface | SPI + 2-wire mode | SPI + 2-wire mode | SPI + 2-wire mode | SPI + 2-wire mode | SPI + 2-wire mode | SPI |
关键差异点
- Integrated 4-channel multiplexer （对比 ADS1212)
- Higher effective resolution at low data rates （对比 ADS1220)
- Programmable gain amplifier with gain 1-16 （对比 ADS1240E)
设计说明
Estimated: at 22-bit resolution and a typical analog supply current of 1.4 mW on the +5V rail, the ADS1213EG4 generates trivial heat, but the surrounding low-level signal traces demand a careful star-ground topology. Place the analog ground pour under pins 11 (AGND), the digital ground pin 18 (DGND) tied to AGND at a single point on the PCB, and route the digital SPI signals (pins 20-26) on the opposite side of the package. Decouple AVDD with a 10 uF ceramic + 0.1 uF bypass pair, and do the same for DVDD. This layout preserves the inherent 22-bit noise floor when digitizing thermocouple or bridge outputs.
Thermocouple-grade measurements easily lose 5-8 bits if the differential input pair (AINP1/AINN1 etc.) sees thermal EMF from copper-to-solder junctions. Best practice is to keep both inputs at the same copper mass, use Kovar or constantan pins in the connector, and avoid running the analog input traces across thermal gradients on the board. Estimated: a 1C differential across the input pair can produce 0.2-0.5 uV of thermal EMF, which is 1-2 LSB at the 22-bit level using the on-chip reference. Always re-zero at the operating temperature using the calibration registers.
Estimated: at the 6.25 kSPS maximum data rate the SPI signals (SCLK, SDIO, SDOUT, DRDY, CS) run with edges in the 5-20 MHz range. Add 33 ohm series resistors on SCLK and SDOUT close to the ADC end to dampen transmission-line ringing on long traces, and use a ground-guard trace between SDIO and any adjacent analog input. Keep the SPI bus wires at least 3 mm from the AVDD inductor or switching supply; otherwise 60-70 dB of rejection at 1 kHz can degrade to 50 dB or worse once the supply ripple couples through capacitive parasitics into the digital pins.
合规信息
G4 suffix confirms lead-free / RoHS-compliant assembly. AEC-Q100 grade not stated in the datasheet and is not required for industrial instrumentation use cases.
