XRD87L99AIQ-F - 10-Bit 2 MSPS 8-Ch MUX ADC | MaxLinear
MPN: XRD87L99AIQ-F ✗ Cuối đờiXRD87L99AIQ-F Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho XRD87L99AIQ-F — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với XRD87L99AIQ-F (cùng hình factor và footprint) — khác nhau ở Package, Resolution, Input Type, Architecture, Number of Input Channels.
XRD87L99AIQ
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX1285BCSA
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX1285BCSA-T
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX1285BESA
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →TLC549CD
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →XRD87L99AIQ-F Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 10 bits |
| Tỷ lệ lấy mẫu | 2 MSPS |
| Number of Input Channels | 8 (analog MUX) |
| Architecture | Successive Approximation |
| Data Interface | Parallel |
| Input Type | Single-Ended |
| Phạm vi điện áp đầu vào | 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) |
| Nhiệt độ hoạt động | -40C to +85C |
| Hộp | 44-QFP |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tray |
| Status | Obsolete / Last Time Buy |
Hướng dẫn cấu hình chân XRD87L99AIQ-F 44-qfp
Cấu hình chân cho XRD87L99AIQ-F (44-qfp gói). Thành phần số hiệu này có chân đầu vào, đầu ra và nguồn cung cấp. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết cấu hình chân bù, bù trừ và chân kích hoạt. Hoàn hảo cho điều kiện tín hiệu và mạch khuếch đại.
Không có dữ liệu chân cụ thể sẵn có cho XRD87L99AIQ-F.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
XRD87L99AIQ-F phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho XRD87L99AIQ-F — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- 8-channel MUX integrated on-die (vsTLC549CD)
- 2 MSPS throughput vs ~45 kSPS on legacy single-channel SARs (vsTLC549CD)
- Parallel digital bus for high-throughput MCU interfaces (vsMAX1285BCSA)
- Wide 44-QFP package simplifies hand prototyping (vsMAX1285BCSA)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
