ADS8401IBPFBTG4 - 16-Bit 1.25MSPS SAR ADC w/ Ref | TI
料号： ADS8401IBPFBTG4 ⚠ 最后一次采购| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $9.45 | $9.45 |
| 10 | $8.55 | $85.50 |
| 100 | $7.62 | $762.00 |
| 500 | $6.85 | $3,425.00 |
| 1,000 | $6.1 | $6,100.00 |
ADS8401IBPFBTG4 概述
A SAR ADC is a type of data converter that performs a binary search through the analog input range using an internal capacitor array and comparator, producing one bit per clock cycle. Unlike pipeline ADCs that use multi-stage gain and error-correction blocks, SAR architectures combine inherent sample-and-hold behavior with deterministic latency, making them ideal for multiplexed channel sampling and control-loop applications. SAR converters sit within the broader data-converter hierarchy as: ADC -> Nyquist-rate ADC -> SAR ADC -> precision data converter -> signal-chain IC. Integrating the reference on-die eliminates the external reference design, board area, and drift normally associated with standalone references.
Key features of the ADS8401 include 1.25 MSPS throughput, true 16-bit no-missing-codes performance, integrated low-drift reference, low power consumption suitable for battery-powered and industrial systems, and a high-speed parallel interface for direct connection to microcontrollers, DSPs, or FPGAs. The device operates from a single 5 V analog supply and a separate 3 V to 5 V digital supply, providing flexibility for mixed-voltage systems. The integrated reference simplifies design-in and reduces BOM cost compared to discrete-reference solutions.
The architecture uses a charge-redistribution DAC array and on-chip sample-and-hold, achieving low aperture delay and predictable latency equal to one conversion cycle. The parallel interface supports byte-wide or 16-bit-wide reads, simplifying data capture without requiring a high-speed serial clock generator. Industrial-grade temperature compliance (A-version die) supports process-control and instrumentation environments.
Typical applications include industrial process control, multichannel data acquisition systems, precision instrumentation, portable battery-powered measurement equipment, optical network monitoring, and medical instrumentation front-ends. The combination of 1.25 MSPS throughput and integrated reference suits applications that require good DC accuracy and reasonable dynamic performance without external reference design.
When designing with this device, ensure the analog and digital supplies are properly decoupled with 1 uF and 0.1 uF ceramic capacitors placed close to the respective supply pins. Maintain a clean analog ground plane separated from digital return currents to avoid coupling noise into the reference and comparator. The integrated reference requires adequate bypass capacitance as specified in the manufacturer datasheet to achieve datasheet-grade performance.
This page consolidates distributor pricing for the ADS8401IBPFBTG4, identifies true drop-in alternatives in the same 48-pin TQFP footprint, and provides practical PCB layout, decoupling, and selection notes not found in the bare datasheet summary.
直接替换替代料： ADS8401IBPFBTG4 ——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： ADS8401IBPFBTG4 （相同外形与封装尺寸） ——差异在于 Package, Analog Supply Voltage, Digital Supply Voltage, Architecture, Operating Temperature.
快速对比工具——选择替代料号进行并排对比：
ADS8401IBPFBT
✅ 直接替换✓ 有现货
$16.2 / 个
查看数据手册 →ADS8401IBPFBR
✅ 直接替换✓ 有现货
$11.75 / 个
查看数据手册 →ADS8401IPFBTG4
✅ 直接替换✓ 有现货
$15.92 / 个
查看数据手册 →ADS8401IBPFBTG4 最大额定值与电气特性
| 分辨率 | 16 bit |
| Sample Rate | 1.25 MSPS |
| Number of Input Channels | 1 |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Unipolar, single-ended |
| Data Interface | Parallel |
| Integrated Reference | Yes (on-chip) |
| Analog Supply Voltage | 5 V nominal |
| Digital Supply Voltage | 3 V to 5 V |
| 工作温度 | -40C to +85C (industrial) |
| 封装 | 48-TQFP (7x7 mm) |
| 安装类型 | Surface Mount |
| MSL 等级 | 2 (per JEDEC J-STD-020) |
| RoHS 状态 | Compliant |
| Terminal Form | Gull Wing |
| Input Range | Unipolar, scale set by integrated reference |
ADS8401IBPFBTG4 引脚配置
| 引脚 1 | AGND — Analog ground (per datasheet) |
| 引脚 2 | AVDD — Analog 5 V supply |
| 引脚 3 | REF — Reference pin / bypass node (per datasheet) |
| 引脚 4 | AIN — Analog input |
| 引脚 5 | CS — Chip select (active low) |
| 引脚 6 | RD — Read strobe (active low) |
| 引脚 7 | BUSY — Conversion in progress indicator |
| 引脚 8 | CONVST — Conversion start |
| 引脚 9 | DB0 — Parallel data bit 0 (LSB) |
| 引脚 10 | DB1 — Parallel data bit 1 |
| 引脚 11 | DB2 — Parallel data bit 2 |
| 引脚 12 | DB3 — Parallel data bit 3 |
| 引脚 13 | DB4 — Parallel data bit 4 |
| 引脚 14 | DB5 — Parallel data bit 5 |
| 引脚 15 | DB6 — Parallel data bit 6 |
| 引脚 16 | DB7 — Parallel data bit 7 |
| 引脚 17 | DVDD — Digital 3-5 V supply |
| 引脚 18 | DGND — Digital ground |
| 引脚 19 | DB8 — Parallel data bit 8 |
| 引脚 20 | DB9 — Parallel data bit 9 |
| 引脚 21 | DB10 — Parallel data bit 10 |
| 引脚 22 | DB11 — Parallel data bit 11 |
| 引脚 23 | DB12 — Parallel data bit 12 |
| 引脚 24 | DB13 — Parallel data bit 13 |
| 引脚 25 | DB14 — Parallel data bit 14 |
| 引脚 26 | DB15 — Parallel data bit 15 (MSB) |
| 引脚 27 | NC — Not connected (per datasheet) |
| 引脚 28 | NC — Not connected (per datasheet) |
| 引脚 29 | AGND — Analog ground |
| 引脚 30 | AVDD — Analog 5 V supply |
| 引脚 31 | REFGND — Reference ground |
| 引脚 32 | REFIN — Reference input / bypass node |
| 引脚 33 | REF — Reference output / bypass node |
| 引脚 34 | REFGND — Reference ground |
| 引脚 35 | AGND — Analog ground |
| 引脚 36 | AVDD — Analog 5 V supply |
| 引脚 37 | NC — Not connected (per datasheet) |
| 引脚 38 | NC — Not connected (per datasheet) |
| 引脚 39 | NC — Not connected (per datasheet) |
| 引脚 40 | NC — Not connected (per datasheet) |
| 引脚 41 | NC — Not connected (per datasheet) |
| 引脚 42 | NC — Not connected (per datasheet) |
| 引脚 43 | NC — Not connected (per datasheet) |
| 引脚 44 | NC — Not connected (per datasheet) |
| 引脚 45 | DVDD — Digital 3-5 V supply |
| 引脚 46 | DGND — Digital ground |
| 引脚 47 | BYTESWAP — Byte swap / mode pin |
| 引脚 48 | RANGE — Input range select (per datasheet) |
典型应用
ADS8401IBPFBTG4 适用于 6 应用s: Industrial Process Control, Multichannel Data Acquisition Systems, Precision Instrumentation, Portable Battery-Powered Measurement, Optical Network Monitoring, Medical Instrumentation Front-End.
Industrial Process Control
The ADS8401IBPFBTG4 fits industrial process-control front-ends where 16-bit no-missing-codes DC accuracy and 1.25 MSPS throughput are required to digitize transducer outputs. Its integrated reference eliminates external drift sources, while the parallel interface connects directly to industrial PLC backplanes and ARM Cortex-M controllers. Industrial-grade -40C to +85C operation matches factory-floor environments without derating, and the 5 V analog / 3-5 V digital supplies simplify mixed-voltage I/O design alongside legacy 24 V loop-powered signal chains.
推荐
Multichannel Data Acquisition Systems
The ADS8401IBPFBTG4's deterministic SAR latency and parallel data interface make it ideal for multiplexed data acquisition systems. An external MUX feeding a single ADS8401 channel achieves synchronized sample-and-hold across multiple analog inputs at 1.25 MSPS aggregate throughput. The integrated reference reduces BOM count per channel, and the 48-TQFP package allows compact board layout when multiple ADS8401 parts are stacked on a single backplane.
推荐
Precision Instrumentation
Precision benchtop instruments such as digital multimeters, source-measurement units, and laboratory data loggers benefit from the ADS8401IBPFBTG4's 16-bit resolution and integrated reference. The parallel output simplifies hookup to FPGA post-processing pipelines for averaging, filtering, or auto-calibration routines. Combined with a low-noise op-amp front-end and the integrated reference, the ADC achieves the INL and DNL specifications needed for high-accuracy DC measurements across the -40C to +85C industrial range.
推荐
Portable Battery-Powered Measurement
Portable and battery-powered measurement equipment requires both low power and good DC accuracy. The ADS8401IBPFBTG4's micropower SAR architecture and integrated reference minimize external circuitry, which reduces PCB area and quiescent draw. A single 5 V analog rail and 3-5 V digital rail allow direct Li-ion / USB supply operation, while the parallel interface avoids the high-speed serial clock generation overhead that would otherwise increase MCU load and battery drain.
推荐
Optical Network Monitoring
Optical-network monitoring and test equipment digitize photodiode currents and reference channels to monitor optical power levels. The ADS8401IBPFBTG4's 1.25 MSPS throughput and 16-bit resolution allow precise optical-power trending, while the integrated reference reduces calibration drift. The 48-TQFP package provides good thermal performance for continuous-monitor designs, and the parallel output simplifies integration with monitoring FPGAs that perform real-time averaging.
推荐
Medical Instrumentation Front-End
Medical instrumentation such as patient monitors, infusion pumps, and diagnostic analyzers require 16-bit DC accuracy with low noise and deterministic latency. The ADS8401IBPFBTG4's integrated reference reduces BOM risk in regulated medical designs, and its SAR architecture provides a predictable one-cycle latency that is easy to time-align in safety-critical firmware. Industrial temperature grade plus the parallel interface simplify integration with medical-grade MCUs.
推荐
推荐产品汇总
工程参考数据： ADS8401IBPFBTG4 ——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 | ADS8401IBPFBT | ADS8401IBPFBR | ADS8401IPFBTG4 |
|---|---|---|---|---|
| Package | 48-TQFP (7x7 mm) | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit |
| Sample Rate | 1.25 MSPS | 1.25 MSPS | 1.25 MSPS | 1.25 MSPS |
| Architecture | SAR | SAR | SAR | SAR |
| Integrated Reference | Yes | Yes | Yes | Yes |
| Interface | Parallel | Parallel | Parallel | Parallel |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C | -40C to +85C | -40C to +85C |
| Lifecycle Status | Last-time-buy | Last-time-buy | Last-time-buy | Last-time-buy |
关键差异点
- Pin-for-pin footprint compatibility across all ADS8401 variants （对比 ADS8401IBPFBR)
- Integrated on-chip reference eliminates external reference IC （对比 ADS7825UE4)
- SAR architecture provides deterministic one-cycle latency （对比 ADS6422IRGC25)
设计说明
Estimated: at 5 V analog supply with 1.25 MSPS continuous conversion, plan ~30-40 mA on AVDD plus 5-10 mA on DVDD. Place 1 uF and 0.1 uF ceramic bypass capacitors within 3 mm of each AVDD/DVDD pin. Route AVDD and DVDD traces star-style from the regulator; do not daisy-chain supply pins. Per TI ADS8401 datasheet, inadequate decoupling couples digital switching noise into the reference and degrades SNR.
Use a partitioned analog/digital ground plane. Pin AGND and DGND both to a single low-impedance ground under the package, but keep digital return currents (parallel bus) on the digital side. Do not route parallel data bus traces under the analog input or reference pins. Allow guard traces around the analog input path on a separate analog layer. Reference: TI ADS8401 datasheet, layout guidelines section.
Do not exceed 5 V on AVDD or 5 V on DVDD. The reference output requires the bypass capacitor specified in the datasheet - omitting it will degrade INL and DNL. The CONVST pulse width minimum must be respected; CS and RD timing margins should be validated against the worst-case timing table in the datasheet, not the typical column.
The parallel data bus runs at the same rate as the conversion cycle; route DB0-DB15 together with matched lengths and a parallel-series termination if traces exceed 25 mm. Place a small (22-100 ohm) series resistor near the ADC bus pins if ringing is observed on the FPGA/MCU side. Keep the BUSY and CONVST traces short and away from switching power converters.
合规信息
RoHS and REACH compliance per DigiKey product page. AEC-Q100 not applicable (this is a data converter, not an automotive-grade IC). Lead-free confirmed per TI product page. Halogen-free status not explicitly listed in available data - mark as unknown.
