XRD87L99AIQ-F - 10-Bit 2 MSPS 8-Ch MUX ADC | MaxLinear
料号： XRD87L99AIQ-F ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $7.2 | $7.20 |
| 10 | $6.48 | $64.80 |
| 100 | $5.76 | $576.00 |
| 500 | $5.04 | $2,520.00 |
| 1,000 | $4.32 | $4,320.00 |
XRD87L99AIQ-F 概述
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that samples continuous analog voltages into a parallel digital word at a defined clock rate. ADCs sit within the broader hierarchy of data acquisition ICs -> data converters -> mixed-signal ICs -> integrated circuits, and they are the critical bridge between analog sensors and digital processors. Multi-channel, low-power ADCs like the XRD87L99AIQ-F are typically used to digitize several sensors with one converter, reducing board area, BOM cost, and software overhead in embedded designs.
Key features of the XRD87L99AIQ-F include 10-bit resolution, an integrated 8-to-1 analog multiplexer with channel-address latches, a parallel microprocessor-compatible digital interface, an external reference input, and a hardware power-down pin. Its wide input range covers GND to VDD, which lets the device directly digitize rail-to-rail sensor outputs. The 44-QFP package is industry-standard and supports conventional surface-mount assembly.
Typical applications for the XRD87L99AIQ-F include multi-channel data acquisition systems, CCD signal processing chains in scanner and copier subsystems, portable and battery-powered instrumentation, industrial process monitoring, and embedded control boards that need to read several analog sensors at moderate speeds. In each case the device's low power dissipation, integrated mux, and parallel interface reduce both component count and software complexity.
Designers should remember that the XRD87L99AIQ-F is in EOL/last-time-buy status according to distributor lifecycle fields, so long-life designs should plan for a qualified replacement or place a last-time-buy order. Drive the analog inputs with low-impedance sources to keep the input settling error inside the 10-bit budget, and place the 0.1uF VDD decoupling capacitor within a few millimeters of the supply pin.
直接替换替代料： XRD87L99AIQ-F ——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： XRD87L99AIQ-F （相同外形与封装尺寸） ——差异在于 Package, Resolution, Input Type, Architecture, Number of Input Channels.
快速对比工具——选择替代料号进行并排对比：
XRD87L99AIQ
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX1285BCSA
✅ 直接替换✓ 有现货
$5.4 / 个
查看数据手册 →MAX1285BCSA-T
✅ 直接替换✓ 有现货
$4.89 / 个
查看数据手册 →MAX1285BESA
✅ 直接替换✓ 有现货
$7.97 / 个
查看数据手册 →XRD87L99AIQ-F 最大额定值与电气特性
| 分辨率 | 10 bits |
| 采样率 | 2 MSPS |
| Number of Input Channels | 8 (analog MUX) |
| Architecture | Successive Approximation |
| Data Interface | Parallel |
| Input Type | Single-Ended |
| 输入电压范围 | GND to VDD |
| Reference Type | External |
| Power Dissipation (Active, typ) | 24 mW |
| Power Dissipation (Power-Down, typ) | 0.1 mW |
| Number of ADC Converters | 1 |
| Sample-and-Hold | Internal (no external S/H required for inputs <100 kHz or CCD signals) |
| 工作温度 | -40C to +85C |
| 封装 | 44-QFP |
| 安装类型 | Surface Mount |
| Packaging | Tray |
| Status | Obsolete / Last Time Buy |
XRD87L99AIQ-F 44-qfp 引脚配置指南
XRD87L99AIQ-F（44-qfp 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： XRD87L99AIQ-F.
请参阅 数据手册 以查看完整引脚配置。
典型应用
XRD87L99AIQ-F 适用于 6 应用s: Multi-Channel Data Acquisition Systems, CCD Signal Processing in Scanners and Copiers, Portable and Battery-Powered Instrumentation, Industrial Process Monitoring, Embedded Control Boards with Multiple Sensors, Medical Monitoring Front Ends.
Multi-Channel Data Acquisition Systems
The XRD87L99AIQ-F's 8-to-1 analog input multiplexer lets a single ADC service up to eight sensors, which is ideal for multi-channel data acquisition front ends. At 2 MSPS, the converter can digitize up to eight channels sequentially at 250 kSPS each, well above typical 10 kHz transducer bandwidths. Its 24 mW active dissipation keeps the front end cool even in sealed enclosures. Place a 0.1uF decoupling capacitor near the VDD pin to keep digital switching noise out of the analog rail.
推荐
CCD Signal Processing in Scanners and Copiers
The XRD87L99AIQ-F datasheet explicitly states that no external sample-and-hold is required for CCD signals, making the part a natural fit for scanner, copier, and machine-vision front ends. The 2 MSPS throughput captures multi-megapixel CCD line rates, and the GND-to-VDD input range accommodates CCD output stages biased near the analog supply. Use an external precision reference (e.g. a low-drift bandgap) on the VHF pin to maximize 10-bit linearity.
推荐
Portable and Battery-Powered Instrumentation
Battery-powered instruments benefit from the XRD87L99AIQ-F's 24 mW active power and 0.1 mW power-down dissipation, which together extend runtime when conversions are bursty. The hardware power-down pin can be toggled between sample bursts, and the parallel interface lets low-cost MCUs read the conversion result in a single bus cycle. Designers should also enable the MCU's idle mode so the system quiescent current stays in the sub-milliamp range.
推荐
Industrial Process Monitoring
Industrial process monitoring typically reads 4-20 mA loops, thermocouples, and bridge sensors, all of which fit naturally into the XRD87L99AIQ-G's GND-to-VDD analog input range. The 8-channel MUX eliminates an external analog switch tree, and the -40C to +85C industrial operating range covers plant-floor environments. Pair the converter with op-amp signal conditioning and an external precision reference to achieve better than 10-bit absolute accuracy in noisy cabinets.
推荐
Embedded Control Boards with Multiple Sensors
Embedded control boards commonly need to monitor several analog sensors (temperature, pressure, light, current) from a single MCU, and the XRD87L99AIQ-F's 8-channel MUX addresses all of them from one converter. The parallel digital interface is compatible with most 8/16-bit MCU external memory buses, so no specialized peripheral is required. A 4-wire SPI-friendly variant is not offered, but the parallel bus allows direct DMA-style capture on microcontrollers that support it.
推荐
Medical Monitoring Front Ends
In low-power medical monitoring designs, the XRD87L99AIQ-F can digitize ECG, pulse oximetry, or temperature sensor signals across its eight analog inputs with 10-bit resolution adequate for trend logging. The 24 mW dissipation keeps thermal rise near the patient interface low, and the parallel output bus feeds directly into a microcontroller or DSP for waveform analysis. As with all medical designs, validate the full signal chain against IEC 60601-1 EMI/EMC limits before release.
推荐
推荐产品汇总
工程参考数据： XRD87L99AIQ-F ——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 | XRD87L99AIQ | MAX1285BCSA | MAX1285BESA | TLC549CD |
|---|---|---|---|---|---|
| Package | 44-QFP | 44-QFP - same | 16-SOIC | 16-SOIC | 8-SOIC |
| Brand | MaxLinear (formerly Exar) | MaxLinear (formerly Exar) | Analog Devices (formerly Maxim) | Analog Devices (formerly Maxim) | Texas Instruments |
| Resolution | 10 bits | 10 bits | 12 bits | 12 bits | 10 bits |
| Input Channels | 8 (MUX) | 8 (MUX) | 8 (MUX) | 8 (MUX) | 1 |
| Data Interface | Parallel | Parallel | Serial/SPI | Serial/SPI | Serial/SPI |
| Operating Temperature | -40C to +85C | -40C to +85C | 0C to +70C (commercial) | -40C to +85C | 0C to +70C |
| Lifecycle Status | Obsolete (EOL) | Obsolete (EOL) | Active | Active | Active |
关键差异点
- 8-channel MUX integrated on-die （对比 TLC549CD)
- 2 MSPS throughput vs ~45 kSPS on legacy single-channel SARs （对比 TLC549CD)
- Parallel digital bus for high-throughput MCU interfaces （对比 MAX1285BCSA)
- Wide 44-QFP package simplifies hand prototyping （对比 MAX1285BCSA)
设计说明
The XRD87L99AIQ-F's 24 mW active dissipation at 2 MSPS is the headline low-power figure, but burst-mode designs should keep the device idle most of the time. Toggle the hardware power-down pin between conversions so that quiescent dissipation drops to 0.1 mW typical. Decouple VDD with a 0.1uF ceramic placed within a few millimeters of the supply pin to keep digital switching noise out of the analog rail.
Drive each analog input with a low-impedance source (<= 1 kohm) so that the internal sample capacitor settles within the 10-bit accuracy window before conversion. The datasheet's 'no external S/H required below 100 kHz' specification assumes such a source. For higher-frequency inputs, add a wideband op-amp buffer (e.g. AD8031 or equivalent) right at the AIN pin to preserve aperture accuracy.
Because the XRD87L99AIQ-F is marked Obsolete (EOL), do not design it into new production volumes without a last-time-buy plan. Place a sufficient last-time-buy order once the design is frozen, or redesign around a current-generation 8-channel SAR ADC in a smaller, lead-free package such as MAX1285BCSA (16-SOIC) or TLV2545 (MSOP-10) to avoid line-down risk later in the product lifecycle.
Route the parallel digital output bus away from the analog input traces and the VREF pin. Place a ground guard ring around the analog input bank and tie AGND and DGND together at a single star point near the ADC's ground pin. Use a solid analog ground pour under the 44-QFP and keep switching converters at least one inch away from the analog input traces.
合规信息
RoHS-compliant lead-free finish indicated by '-F' designation per MaxLinear/Exar part numbering. Halogen-free status not stated in distributor data and is marked unknown. Not AEC-Q100 qualified; intended for industrial/consumer designs.
