XRD87L99AIQ-F - 10-Bit 2 MSPS 8-Ch MUX ADC | MaxLinear
MPN： XRD87L99AIQ-F ✗ 停產XRD87L99AIQ-F 概覽
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.
直接替換替代品，適用於 XRD87L99AIQ-F — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： XRD87L99AIQ-F （相同外形與佔位） — 差異在於 Package, Resolution, Input Type, Architecture, Number of Input Channels.
XRD87L99AIQ
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MAX1285BCSA
✅ 直接替換聯絡詢價
查看資料表 →MAX1285BCSA-T
✅ 直接替換聯絡詢價
查看資料表 →MAX1285BESA
✅ 直接替換聯絡詢價
查看資料表 →XRD87L99AIQ-F 最大額定值與電氣特性
| 解析度 | 10 bits |
| 取樣率 | 2 MSPS |
| Number of Input Channels | 8 (analog MUX) |
| Architecture | Successive Approximation |
| Data Interface | Parallel |
| Input Type | Single-Ended |
| 輸入電壓範圍 | 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) |
| 工作溫度 | -40C to +85C |
| 封裝 | 44-QFP |
| 安裝類型 | Surface Mount |
| Packaging | Tray |
| Status | Obsolete / Last Time Buy |
XRD87L99AIQ-F 44-qfp 腳位配置指南
XRD87L99AIQ-F（44-qfp 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： XRD87L99AIQ-F.
請參閱 資料表 以查看完整腳位配置。
典型應用
XRD87L99AIQ-F 適用於 6 應用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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 XRD87L99AIQ-F — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 |
主要差異化特點
- 8-channel MUX integrated on-die (對比TLC549CD)
- 2 MSPS throughput vs ~45 kSPS on legacy single-channel SARs (對比TLC549CD)
- Parallel digital bus for high-throughput MCU interfaces (對比MAX1285BCSA)
- Wide 44-QFP package simplifies hand prototyping (對比MAX1285BCSA)
設計說明
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.
合規資訊
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.
