AD876JR - 10-Bit 20 MSPS CMOS ADC | Analog Devices
MPN： AD876JR ⚠ 最後購買機會AD876JR 概覽
A sampling ADC is a data-conversion IC that samples an analog voltage at a controlled instant and converts it into a digital code. The AD876 belongs to the ADC and DAC product hierarchy, where its 10-bit resolution represents 1,024 discrete output levels. Its 20 MSPS conversion rate supports high-speed data acquisition, while its CMOS implementation and 160 mW power rating target portable and space-constrained systems.
The AD876's 20 MSPS throughput combines 10-bit resolution with a relatively low 160 mW power requirement. Its +5 V single-supply architecture simplifies system power planning, and the 0.5 LSB differential nonlinearity specification supports predictable transfer behavior. No missing codes are guaranteed, while standby mode and three-state outputs help conserve power and simplify shared-bus control.
The AD876 also provides a pin-compatible upgrade path for eight-bit designs, allowing a layout created for lower resolution to migrate to the AD876's 10-bit performance when prototype results justify the change. The 28-SOIC package is supported by the manufacturer datasheet, which also provides guidance on input conditioning. For signal bandwidths below 10 MHz, the series input resistor may be increased proportionally; otherwise, it should not exceed 200 ohms.
Typical uses include video and multimedia digitization, high-speed data acquisition, communications, imaging, portable instrumentation, and CCD-based input systems such as color scanners. The AD876's single-supply operation and low power are especially relevant to portable equipment, while its pipelined 20 MSPS conversion rate supports sampled signal chains operating at the upper end of its supported bandwidth.
Designers should treat the analog input network as a matched high-speed signal path. Use the manufacturer-recommended input impedance and termination network, observe the stated series-resistor limit, and provide clean supply decoupling. Because the converter has 160 mW power dissipation, system-level thermal requirements remain modest, although total converter and digital-interface power should be included in enclosure temperature calculations.
This product page consolidates the verified manufacturer specifications, lifecycle status, distributor pricing reference, package information, and drop-in comparison limits into an engineering-oriented record. It also separates confirmed AD876 characteristics from replacement candidates, so procurement teams can identify the standard AD876AR option while engineers verify temperature grade, pin compatibility, qualification, and availability before approving any substitution.
直接替換替代品，適用於 AD876JR — 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。
AD876JR 最大額定值與電氣特性
| ADC Type | 10-bit sampling ADC |
| 解析度 | 10 bit |
| 取樣率 | 20 MSPS |
| Input Count | 1 input |
| Architecture | Pipelined |
| Power Dissipation | 160 mW |
| 供應電壓 | +5 V |
| Process Technology | CMOS |
| Differential Nonlinearity | 0.5 LSB guaranteed |
| Missing Codes | No missing codes guaranteed |
| Power-Down Mode | Standby mode |
| Digital Output State | Three-state outputs |
| Digital Input/Output | Three-state digital I/O |
| Upgrade Path | Pin-compatible eight-bit layout upgrade to 10-bit resolution |
| Maximum Series Input Resistor | 200 ohm or less |
| Series Resistor Guidance | May increase proportionally for signal bandwidths below 10 MHz |
| 封裝 | 28-SOIC |
| 安裝類型 | Surface mount |
AD876JR 28-soic 腳位配置指南
AD876JR（28-soic 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： AD876JR.
請參閱 資料表 以查看完整腳位配置。
典型應用
AD876JR 適用於 6 應用s: High-Speed Data Acquisition, Video and Multimedia Digitization, CCD-Based Imaging and Scanners, Communications Signal Sampling, Portable Measurement Instruments, Industrial Imaging Control.
High-Speed Data Acquisition
The AD876JR fits high-speed data acquisition systems requiring 20 MSPS conversion and 10-bit digital output resolution. A 160 mW power dissipation rating and single +5 V supply reduce the power-supply burden compared with many multi-rail high-speed converters. The converter can sample the analog input through a controlled impedance network, with the manufacturer limiting the series resistor to 200 ohms or less for applications above 10 MHz. Designers should budget acquisition-channel timing, reference stability, digital buffering, and sufficient supply decoupling around the ADC.
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Video and Multimedia Digitization
The AD876JR is applicable to video and multimedia digitization where a 20 MSPS sampling rate and 10-bit resolution are sufficient for the source signal. Its +5 V single-supply operation simplifies portable and compact equipment, while standby mode can reduce consumption when continuous conversion is not required. The ADC's pipelined architecture and three-state digital outputs support flexible digital-interface routing. System designers must confirm source bandwidth, pixel or sample-rate requirements, clock jitter, output timing, and whether the complete signal chain can preserve the converter's specified 10-bit performance.
推薦
CCD-Based Imaging and Scanners
The AD876JR is well matched to CCD-based imaging systems such as color scanners because the manufacturer identifies its 20 MSPS speed, 10-bit resolution, and single-supply operation as suitable for these applications. The 160 mW power dissipation allows the converter to serve compact imaging electronics without the supply complexity of a multi-rail ADC. Integration requires careful clocking and analog-input layout, including the manufacturer's 200-ohm-or-less series-resistor guidance for bandwidths above 10 MHz. CCD timing, output settling, noise, and channel matching must also be validated as a complete chain.
推薦
Communications Signal Sampling
The AD876JR can sample communications signals when 20 MSPS and 10-bit resolution match the channel bandwidth and required code width. Its CMOS implementation, 160 mW power dissipation, and +5 V single-supply operation are valuable in compact communication equipment. The pipelined converter can feed a digital processor, while three-state outputs provide flexibility for bus-oriented designs. Engineers should evaluate clock jitter, input bandwidth, reference accuracy, and digital timing margins, and must follow the manufacturer input-network and series-resistance guidance to avoid degrading conversion performance.
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Portable Measurement Instruments
The AD876JR supports portable measurement instruments that need rapid sampling without a multi-rail converter architecture. Operating from +5 V at 160 mW power dissipation simplifies battery and thermal planning, while standby mode permits lower consumption during inactive intervals. A typical instrument can use the ADC to digitize a conditioned sensor or transducer signal before transferring data to an embedded processor. The design must still account for input-source settling, reference-voltage accuracy, clock quality, digital layout, and the manufacturer's limitation of the input series resistor to 200 ohms or less above 10 MHz.
推薦
Industrial Imaging Control
The AD876JR is appropriate for industrial imaging controls that sample sensor outputs at rates compatible with its 20 MSPS conversion capability. The 10-bit result preserves 1,024 digital levels, while the 160 mW CMOS converter can simplify power allocation in space-constrained equipment. Standby mode supports intermittent operation, and three-state outputs can assist bus integration. For industrial systems, engineers should verify electromagnetic susceptibility, grounding, clock distribution, analog-input return paths, thermal exposure, and the operational-temperature ordering code because the supplied excerpts do not establish the exact suffix qualification.
推薦
推薦產品摘要
工程參考資料，適用於 AD876JR — 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 | AD876AR |
|---|---|---|
| Brand | Analog Devices | Analog Devices |
| Package | 28-SOIC | 28-SOIC |
| Resolution | 10 bit | 10 bit |
| Sampling Rate | 20 MSPS | 20 MSPS |
| Power Dissipation | 160 mW | 160 mW |
| Supply Voltage | +5 V | +5 V |
| Architecture | Pipelined sampling ADC | Pipelined sampling ADC |
| Input Count | 1 input | 1 input |
| Differential Nonlinearity | 0.5 LSB guaranteed | 0.5 LSB guaranteed |
| Missing Codes | No missing codes guaranteed | No missing codes guaranteed |
主要差異化特點
- Closest verified drop-in ordering option (對比AD876AR)
- Single-supply operation simplifies power architecture (對比AD876AR)
- Defined converter performance and output behavior (對比AD876AR)
設計說明
Use the manufacturer's recommended input network and keep the connection from the signal source to the analog input short and controlled. The Analog Devices AD876 datasheet limits the series resistor to 200 ohms or less and permits proportional increases only when signal bandwidth is below 10 MHz. Avoid long PCB traces, abrupt impedance changes, and stubs near the input. Validate source settling with the worst-case output impedance, capacitor tolerance, temperature, and the selected sampling clock rather than relying only on a nominal bandwidth calculation.
Plan a clean +5 V rail and place decoupling close to the converter's supply pins according to the manufacturer layout guidance. The published 160 mW dissipation is the converter's stated power figure, but total board demand can be higher after clocking, buffering, references, and interface loads. Because the AD876 family is LAST TIME BUY, verify the available date code and inspect the device for authenticity. Do not infer lead-free or RoHS status from the ordering suffix without checking the current manufacturer documentation.
Preserve a compact analog-input layout and separate the converter's analog and digital return paths as far as practical. Route the digital output bus away from the input and reference network, and use a low-jitter clock source because sampling accuracy depends on timing quality. The AD876 includes standby mode and three-state outputs, but these features do not remove the need for proper clock, reference, and power distribution. Before releasing a PCB, compare every pin against the current 28-SOIC mechanical drawing and pin table in the official manufacturer datasheet.
合規資訊
The supplied excerpts do not contain explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. AEC-Q100 is marked not_applicable because no automotive qualification was stated for this family in the provided data.