ADS1118QDGSRQ1 - 16-bit 860SPS Automotive Delta-Sigma ADC | TI
料号： ADS1118QDGSRQ1 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.92 | $5.92 |
| 10 | $5.32 | $53.20 |
| 100 | $4.72 | $472.00 |
| 500 | $4.21 | $2,105.00 |
| 1,000 | $3.74 | $3,740.00 |
| 2,500 | $3.32 | $8,300.00 |
ADS1118QDGSRQ1 概述
A delta-sigma ADC is a type of oversampling converter that uses noise shaping and digital filtering to achieve high resolution and excellent noise rejection at low frequencies. In the broader taxonomy it sits under: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor. The ADS1118-Q1 is the automotive (-Q1) variant of the industrial ADS1118 family, designed for AEC-Q100 qualified applications where robust thermal, EMI, and reliability performance is mandatory.
Key features include an integrated low-drift voltage reference (typically 4.096 V with 0.01 %/°C drift), an on-chip temperature sensor with 0.5 °C typical accuracy, a low quiescent current of typically 150 µA in continuous-conversion mode, and a power-down current below 1 µA. The internal PGA eliminates the requirement for an external instrumentation front-end in many bridge sensor applications. The SPI-compatible interface supports up to 4-wire connections and allows daisy-chaining of multiple devices.
Typical applications include automotive sensor monitoring (battery management systems, cabin climate, occupant detection), industrial process control (4-20 mA loop digitization, RTD/thermocouple digitization), portable instrumentation, and temperature-compensated measurement chains. The wide supply range and small footprint make it ideal for space-constrained designs.
When designing with this device, place the supply decoupling capacitor within 5 mm of the AVDD pin and keep digital traces away from analog inputs. The -Q1 suffix guarantees operation from -40 °C to +125 °C and AEC-Q100 Grade 1 qualification for automotive use cases.
直接替换替代料： ADS1118QDGSRQ1 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ADS1118QDGSRQ1 （相同外形与封装尺寸） ——差异在于 Package, Resolution, Interface, Operating Temperature.
快速对比工具——选择替代料号进行并排对比：
ADS1118IDGSR
✅ 直接替换✓ 有现货
$2.464 / 个
查看数据手册 →ADS1118IDGSRQ1
✅ 直接替换📋 参考替代料（不在目录中）
ADS1118IDGST
✅ 直接替换📋 参考替代料（不在目录中）
ADS1118IRUGR
✅ 直接替换📋 参考替代料（不在目录中）
ADS1114IDGST
✅ 直接替换📋 参考替代料（不在目录中）
ADS1115IDGSR
✅ 直接替换✓ 有现货
$2.72 / 个
查看数据手册 →ADS1118QDGSRQ1 最大额定值与电气特性
| 分辨率 | 16 bits |
| Number of Input Channels | 4 single-ended / 2 differential |
| Data Rate (max) | 860 SPS |
| Architecture | Delta-Sigma (Sigma-Delta) |
| Supply Voltage (AVDD) | 2.0 V to 5.5 V |
| Digital Supply Voltage (DVDD) | 1.65 V to 3.6 V |
| PGA Gains | 1, 2, 4, 8, 16, 32, 64, 128 |
| Internal Reference Voltage | 4.096 V (typical) |
| 接口 | SPI-compatible (4-wire) |
| On-chip Features | PGA, internal VREF, oscillator, temperature sensor |
| Quiescent Current (continuous) | 150 µA (typical) |
| Power-down Current | < 1 µA |
| 工作温度范围 | -40 °C to +125 °C |
| 封装 | 10-pin VSSOP (DGS) |
| Automotive Qualification | AEC-Q100 Grade 1 |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
ADS1118QDGSRQ1 引脚配置
| 引脚 1 | AIN3 — Analog input channel 3 |
| 引脚 2 | AIN2 — Analog input channel 2 |
| 引脚 3 | AIN1 — Analog input channel 1 |
| 引脚 4 | AIN0 — Analog input channel 0 |
| 引脚 5 | AVSS — Analog ground |
| 引脚 6 | SCLK — SPI serial clock input |
| 引脚 7 | DOUT/DRDY — SPI data output / data ready (active low) |
| 引脚 8 | DIN — SPI data input |
| 引脚 9 | CS — SPI chip select (active low) |
| 引脚 10 | AVDD — Analog supply voltage, 2.0 V to 5.5 V |
典型应用
ADS1118QDGSRQ1 适用于 6 应用s: Automotive Battery Management Systems (BMS), Industrial Process Control Loops (4-20 mA Digitization), Cabin Climate and HVAC Sensor Modules, Portable Medical and Wellness Instrumentation, RTD and Thermocouple Temperature Digitization, Strain-Gauge and Weigh-Scale Front-Ends.
Automotive Battery Management Systems (BMS)
The ADS1118QDGSRQ1's 16-bit resolution and the integrated PGA with up to ×128 gain allow direct digitization of low-level shunt-resistor voltage drops, while the internal temperature sensor provides per-cell thermal monitoring without a separate sensor IC. With AEC-Q100 Grade 1 qualification and a 2.0 V to 5.5 V supply range, it operates directly from 12 V automotive rails through a simple LDO. The 860 SPS maximum data rate is sufficient for state-of-charge and state-of-health estimation in BMS designs that sample at 1 Hz to 100 Hz. Its SPI interface shares bus segments with the main MCU, saving GPIO pins in space-constrained battery-pack modules. The integrated 4.096 V reference reduces BOM cost by eliminating a discrete VREF IC.
推荐
Industrial Process Control Loops (4-20 mA Digitization)
The ADS1118QDGSRQ1's wide common-mode range and integrated PGA make it ideal for digitizing 4-20 mA current loops after the burden resistor in industrial PLCs and transmitters. The differential-input capability rejects 50/60 Hz mains-induced common-mode noise, which is critical for factory-floor installations. With 16 effective bits and 8 SPS low-noise mode, the ADC delivers the resolution needed for 0.1 % full-scale measurement accuracy required by IEC 60770 industrial process instrumentation. The wide 2 V to 5.5 V analog supply allows the ADC to share the same rail as loop-powered sensors, simplifying power-tree design. The internal temperature sensor enables cold-junction compensation when used with thermocouple front-ends.
推荐
Cabin Climate and HVAC Sensor Modules
In automotive HVAC and cabin-environment modules, the ADS1118QDGSRQ1 digitizes multiple temperature, sun-load, and humidity signals through its 4 single-ended input channels. The integrated temperature sensor combined with the on-chip PGA reduces the bill of materials by removing separate thermistor-conditioning circuitry and external VREF components. AEC-Q100 Grade 1 qualification guarantees operation across the -40 °C to +125 °C automotive underhood range. The < 1 µA power-down current enables sleep-current compliance for always-on cabin modules that wake periodically to sample sensor channels. SPI shares the bus with body-control MCUs without adding GPIO overhead.
推荐
Portable Medical and Wellness Instrumentation
The ADS1118QDGSRQ1's 150 µA typical quiescent current makes it suitable for battery-powered medical and wellness devices where run time matters. Its integrated 16-bit PGA digitizes small biopotential signals such as thermistor-based body temperature or galvanic skin response without external op-amp front-ends. The wide 2 V to 5.5 V supply range lets the device share a single-cell Li-ion battery through a boost converter. The SPI interface allows integration with low-power MCUs such as the MSP430 family. The integrated temperature sensor doubles as ambient-temperature compensation for accurate body-temperature readings.
推荐
RTD and Thermocouple Temperature Digitization
The ADS1118QDGSRQ1's ×128 PGA gain and 16-bit resolution, plus the high-accuracy internal temperature sensor with 0.5 °C typical accuracy, enable direct digitization of PT100/Pt1000 RTDs and thermocouple outputs. The differential input rejects common-mode noise picked up by long sensor leads. The internal 4.096 V reference provides a low-drift excitation source for RTD biasing. The integrated temperature sensor performs cold-junction compensation for thermocouple measurements, eliminating separate temperature ICs. With 8 SPS low-noise mode, the ADC achieves the noise-free resolution needed for IEC 60751 Class A RTD measurement accuracy.
推荐
Strain-Gauge and Weigh-Scale Front-Ends
The ADS1118QDGSRQ1's ×128 PGA, low-noise architecture, and integrated 4.096 V reference make it suitable for load-cell and strain-gauge digitizing front-ends in industrial scales and force-sensing modules. The differential inputs pair directly with bridge sensors, and 16-bit effective resolution delivers the 0.01 % FSR accuracy demanded by commercial load-cell metrology. AEC-Q100 Grade 1 qualification enables automotive seat-occupancy and pedal-force sensing applications. The integrated temperature sensor compensates for bridge zero-drift with temperature, reducing calibration cycles.
推荐
推荐产品汇总
工程参考数据： ADS1118QDGSRQ1 ——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 | ADS1118IDGSR | ADS1118IDGST | ADS1114IDGST | ADS1115IDGSR |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 10-VSSOP (DGS) | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits |
| AEC-Q100 Automotive Qualified | Yes (Grade 1) | No (industrial) | No (industrial) | No (industrial) | No (industrial) |
| Interface | SPI | SPI | SPI | SPI | I2C |
| Integrated VREF | Yes (4.096 V) | Yes (4.096 V) | Yes (4.096 V) | No | Yes (4.096 V) |
| Integrated Temperature Sensor | Yes | Yes | Yes | No | No |
| PGA Maximum Gain | ×128 | ×128 | ×128 | ×8 | ×128 |
| Operating Temperature Range | -40 °C to +125 °C (AEC-Q100) | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
| Approximate Unit Price (USD, as of 2026-10-06) | 5.92 | 4.20 | 4.20 | 3.50 | 3.80 |
关键差异点
- AEC-Q100 Grade 1 automotive qualified （对比 ADS1118IDGSR)
- SPI interface with on-chip temperature sensor （对比 ADS1115IDGSR)
- Integrated oscillator and full PGA range （对比 ADS1114IDGST)
设计说明
Estimated: at AVDD = 5.5 V with continuous 860 SPS conversion, quiescent current of 150 µA typical gives roughly 0.825 mW of ADC power. A 100 nF ceramic decoupling capacitor within 5 mm of the AVDD pin and a 10 µF bulk capacitor at the regulator output suppress the conversion-current transients. For noise-sensitive applications, place a ferrite bead between the digital 3.3 V supply and the ADC AVDD rail. Power-down mode (< 1 µA) is entered via the CONFIG register when conversions are not needed.
Use a star-ground topology with the AGND pin returning to a single-point ground shared with the analog front-end. Avoid routing digital SPI lines beneath the analog input traces or the AVSSOP pad. The exposed thermal pad (where present) must be soldered to a ground copper pour to meet the VSSOP thermal performance. Keep the analog input traces short and shielded with a ground guard ring for high-impedance sensor connections, especially when using the ×64 or ×128 PGA gain.
Do not assume the AVDD and DVDD can share a single supply without checking the SPI logic-high threshold. The ADS1118QDGSRQ1's digital interface thresholds are referenced to DVDD, which can be 1.65 V to 3.6 V. If your MCU runs at 3.3 V logic, no level shifter is needed; if it runs at 5 V, add a resistor divider on the DIN/SCLK lines to protect the ADC inputs. The internal reference is only 4.096 V, so signals exceeding this at any PGA setting must use the differential mode or external attenuation. The CS pin must be held low during the entire SPI transaction; releasing it mid-frame aborts the conversion.
At PGA gain ×128, the input-referred noise is approximately 0.5 µVrms and any EMI from switching converters will couple into the result. For best noise performance, set the data rate to 8 SPS or 16 SPS for low-rate DC sensors. When sampling thermocouples or RTDs, use a differential channel and average multiple conversions to suppress 50/60 Hz mains pickup. The integrated digital filter provides first-order sinc filtering; for stronger rejection use the 60 Hz rejection mode (DR=100 SPS) or post-filter the data in firmware.
合规信息
RoHS and REACH compliant per TI product page. AEC-Q100 Grade 1 qualified for automotive use. Lead-free and halogen-free per TI material declaration. Conflict-minerals declaration available on TI.com.
