AD7828LPZ-REEL - 8-Bit 8-Ch 50kSPS Half-Flash ADC | Analog Devices
料号： AD7828LPZ-REEL ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $7.45 | $7.45 |
| 10 | $6.71 | $67.10 |
| 100 | $5.96 | $596.00 |
| 500 | $5.36 | $2,680.00 |
| 1,000 | $4.77 | $4,770.00 |
| 3,000 | $4.18 | $12,540.00 |
AD7828LPZ-REEL 概述
A half-flash ADC is a multi-step flash converter that performs a coarse conversion, generates a DAC residue, then performs a second flash conversion on the residue; the two results are combined digitally to produce the final code. Within the broader hierarchy, half-flash ADCs sit between successive-approximation (SAR) converters and full-flash converters - faster than typical SAR ADCs of equivalent resolution but slower than full-flash, at lower cost and lower power. ADCs of this class are widely used as the analog front end of microcomputer-based instrumentation where multiple sensors must be scanned and digitized with deterministic latency.
Key features of the AD7828LPZ-REEL include 8 multiplexed analog input channels, a built-in track-and-hold, a parallel microprocessor interface using standard CS and RD signals, a single +5 V supply, and typical power dissipation of 40 mW to 50 mW. The device is fabricated in an advanced, all ion-implanted Linear-Compatible CMOS (LC²MOS) process that combines bipolar analog precision with CMOS digital logic on a single die.
Typical applications include multi-channel data-acquisition systems, process-control front ends, industrial instrumentation, point-of-sale terminals, and any embedded system requiring simultaneous sampling of multiple analog sensors through a single ADC. The parallel interface makes the part especially easy to drop into 8051-, 68HC11-, and 80C196-style microcontroller buses without glue logic.
When designing with the AD7828, note that the analog input range is 0 V to VREF (with VREF tied to VDD for a 0-5 V range), so input signals that swing below ground or above the reference require a level-shift network. Decouple VDD with a 0.1 µF ceramic in parallel with a 10 µF tantalum placed within 1 cm of the supply pin to suppress the digital switching transients that can couple into the analog input. The REEL suffix denotes Tape & Reel packaging for high-volume SMT assembly.
This page synthesizes distributor pricing, drop-in cross-references from the AD7828 family, and practical design notes that go beyond the manufacturer datasheet to help you decide whether the AD7828LPZ-REEL is the right 8-bit multi-channel ADC for your design.
直接替换替代料： AD7828LPZ-REEL ——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： AD7828LPZ-REEL （相同外形与封装尺寸） ——差异在于 Architecture, Data Interface, Operating Temperature, Package / Case, Process Technology.
快速对比工具——选择替代料号进行并排对比：
AD7828KPZ-REEL
✅ 直接替换✓ 有现货
$7.95 / 个
查看数据手册 →AD7828LPZ
✅ 直接替换📋 参考替代料（不在目录中）
AD7828LP-REEL
✅ 直接替换📋 参考替代料（不在目录中）
AD7828KP-REEL
✅ 直接替换📋 参考替代料（不在目录中）
AD7828KNZ
✅ 直接替换📋 参考替代料（不在目录中）
AD7828LPZ-REEL 最大额定值与电气特性
| 分辨率 | 8 bits |
| Number of Analog Input Channels | 8 |
| Architecture | Half-Flash (two-step flash) |
| Sampling Rate (Per Second) | 50 kSPS |
| Conversion Time per Channel | 2.5 µs |
| Analog Input Range | 0 V to +5 V (with external +5 V VREF tied to VDD) |
| Data Interface | Parallel (CS, RD, three-state data outputs) |
| 电源电压 | Single +5 V |
| Typical Power Dissipation | 40 mW to 50 mW |
| On-Chip Track-and-Hold | Yes (10 kHz full-scale input bandwidth, 157 mV/µs slew rate) |
| 工作温度 | 0 °C to +125 °C (see _validation_note) |
| 封装 / 外壳 | 28-PLCC (J-Lead), 11.51 mm × 11.51 mm |
| 安装类型 | Surface Mount |
| Packaging | Tape & Reel (REEL) |
| Process Technology | LC²MOS (Linear-Compatible CMOS, ion-implanted) |
AD7828LPZ-REEL 引脚配置
| 引脚 1 | DB0 — Data output Bit 0 (three-state) |
| 引脚 2 | DB1 — Data output Bit 1 (three-state) |
| 引脚 3 | DB2 — Data output Bit 2 (three-state) |
| 引脚 4 | DB3 — Data output Bit 3 (three-state) |
| 引脚 5 | DB4 — Data output Bit 4 (three-state) |
| 引脚 6 | DB5 — Data output Bit 5 (three-state) |
| 引脚 7 | DB6 — Data output Bit 6 (three-state) |
| 引脚 8 | DB7 — Data output Bit 7 (three-state, MSB) |
| 引脚 9 | AGND — Analog ground |
| 引脚 10 | VDD — +5 V supply |
| 引脚 11 | VREF — Reference voltage input (tie to VDD for 0-5 V range) |
| 引脚 12 | AIN1 — Analog input channel 1 |
| 引脚 13 | AIN2 — Analog input channel 2 |
| 引脚 14 | AIN3 — Analog input channel 3 |
| 引脚 15 | AIN4 — Analog input channel 4 |
| 引脚 16 | AIN5 — Analog input channel 5 |
| 引脚 17 | AIN6 — Analog input channel 6 |
| 引脚 18 | AIN7 — Analog input channel 7 |
| 引脚 19 | AIN8 — Analog input channel 8 |
| 引脚 20 | NC — Not connected (per datasheet) |
| 引脚 21 | MODE — Mode select input |
| 引脚 22 | A0 — Channel address bit 0 (LSB) |
| 引脚 23 | A1 — Channel address bit 1 |
| 引脚 24 | A2 — Channel address bit 2 (MSB) |
| 引脚 25 | EOC — End-of-conversion output |
| 引脚 26 | RD — Read input (active low) |
| 引脚 27 | CS — Chip select input (active low) |
| 引脚 28 | DGND — Digital ground |
典型应用
AD7828LPZ-REEL 适用于 6 应用s: Multi-Channel Data Acquisition Systems, Process Control and Industrial Instrumentation, Point-of-Sale Terminals, Embedded Microcontroller Analog Front Ends, Automotive Sensor Multiplexing, Battery-Powered Portable Instrumentation.
Multi-Channel Data Acquisition Systems
The AD7828LPZ-REEL fits multi-channel data-acquisition front ends where 4-8 sensors must be scanned through a single ADC. Its 8 single-ended analog input channels, on-chip multiplexer, and 2.5 µs half-flash conversion time let a single 8-channel scan complete in roughly 25 µs, supporting per-channel throughput up to 50 kSPS. The on-chip track-and-hold removes the need for an external sample-and-hold, simplifying the analog front end. Placed between the sensor signal-conditioning network and the microcontroller bus, the parallel CS/RD interface drops directly into 8051, 68HC11, or 80C196-style ports, eliminating glue logic. Compared with discrete ADC + MUX designs, the integrated approach cuts board area, lowers BOM cost, and removes channel-to-channel skew because all channels share the same conversion core.
推荐
Process Control and Industrial Instrumentation
In process-control front ends that digitize 4-20 mA or 0-5 V transducer outputs, the AD7828LPZ-REEL provides 8 channels of 8-bit resolution with 50 kSPS throughput - sufficient for closed-loop control loops on temperature, pressure, flow, and level transmitters. The single +5 V supply matches the 5 V rails typical in PLC analog input modules, and the parallel bus keeps deterministic latency for control loops running at 1-10 kHz update rates. The half-flash architecture guarantees a fixed 2.5 µs conversion time regardless of input code, avoiding the variable-latency behavior of SAR ADCs in some multiplexed designs. The 28-PLCC J-Lead package is mechanically robust on industrial backplanes and accepts conformal coating for harsh-environment deployments.
推荐
Point-of-Sale Terminals
The AD7828LPZ-REEL fits point-of-sale (POS) terminals where barcode scanners, weigh scales, card-reader sensors, and operator-panel voltages share a single microcontroller. The 8 analog inputs cover every sensor channel with 8-bit resolution adequate for barcode analog waveforms, scale load-cell signal conditioning outputs, and battery/supply monitoring. The 50 kSPS aggregate sample rate keeps up with scanner sweep frequencies, and the half-flash core gives a deterministic 2.5 µs conversion so the POS controller can schedule reads on a fixed timing grid. Single +5 V operation simplifies the power tree, and the PLCC package is friendly to high-volume SMT assembly lines typical in commercial POS hardware.
推荐
Embedded Microcontroller Analog Front Ends
The AD7828LPZ-REEL is a natural fit for microcontroller-based embedded designs that need to digitize 8 analog signals without an external MUX. Its parallel CS/RD interface maps directly onto 8051, 68HC11, and 80C196 external-memory buses, so no glue logic is required - the CS and RD strobes initiate conversion and readback, and the internal channel counter auto-increments on each RD. The 0-5 V analog input range with VREF tied to VDD is compatible with most 5 V sensor outputs without level-shifting. The half-flash architecture's deterministic 2.5 µs conversion time simplifies real-time firmware scheduling, while the on-chip track-and-hold relaxes analog driver bandwidth requirements upstream of the MUX.
推荐
Automotive Sensor Multiplexing
In cost-sensitive automotive subsystems that scan multiple 0-5 V sensors (throttle position, manifold pressure, oil level, battery monitor), the AD7828LPZ-REEL provides 8 channels of 8-bit conversion at 50 kSPS aggregate. The PLCC J-Lead package withstands automotive under-hood vibration, and the LC²MOS process technology provides good ESD and latch-up immunity for the harsh automotive electrical environment. Designers building passenger-comfort modules, body controllers, or HVAC controllers often pair the AD7828 with a microcontroller that polls 4-8 sensors per scan; for under-hood powertrain applications requiring wider temperature range, the AD7828KPZ-REEL drop-in variant is preferred.
推荐
Battery-Powered Portable Instrumentation
The AD7828LPZ-REEL's 40-50 mW typical power dissipation makes it acceptable for line-powered or wall-adapter-powered portable instrumentation, where the half-flash architecture keeps quiescent current low between conversions. Battery-powered designs that require extended runtime should consider whether the ADC's continuous-conversion power budget is acceptable; in those cases, duty-cycling the conversions with the CS pin and putting the device into a low-power standby state between scans is the typical power-saving pattern. The single +5 V supply matches USB-powered or 4-cell NiMH stacks with a boost regulator, simplifying portable designs.
推荐
推荐产品汇总
工程参考数据： AD7828LPZ-REEL ——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 | AD7828KPZ-REEL | AD7828LPZ | AD7828LP-REEL | AD7828KP-REEL |
|---|---|---|---|---|---|
| Package | 28-PLCC (J-Lead) | 28-PLCC (J-Lead) - same | 28-PLCC (J-Lead) - same | 28-PLCC (J-Lead) - same | 28-PLCC (J-Lead) - same |
| Brand | Analog Devices | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits |
| Number of Channels | 8 | 8 | 8 | 8 | 8 |
| Sample Rate | 50 kSPS | 50 kSPS | 50 kSPS | 50 kSPS | 50 kSPS |
| Conversion Time | 2.5 µs | 2.5 µs | 2.5 µs | 2.5 µs | 2.5 µs |
| Supply Voltage | Single +5 V | Single +5 V | Single +5 V | Single +5 V | Single +5 V |
| Operating Temperature Grade | LP (commercial) | KP (industrial) | LP (commercial) | LP (commercial) | KP (industrial) |
| Architecture | Half-Flash | Half-Flash | Half-Flash | Half-Flash | Half-Flash |
关键差异点
- Single +5 V supply with 8 channels of half-flash conversion （对比 AD7828LPZ (tube variant))
- Higher operating-temperature grade available on the same footprint （对比 AD7828LPZ-REEL)
- Half-flash architecture gives deterministic 2.5 µs conversion （对比 Typical SAR ADC of equivalent resolution)
- On-chip track-and-hold on every channel （对比 Discrete MUX + ADC solutions)
设计说明
Decouple VDD with a 0.1 µF ceramic capacitor in parallel with a 10 µF tantalum or low-ESR electrolytic placed within 1 cm of the supply pin. The half-flash conversion core draws transient currents during each 2.5 µs conversion, and inadequate decoupling couples digital switching noise into the analog input MUX, degrading SNR. Star-ground the AGND and DGND pins at the ADC and tie them to a single low-impedance ground plane underneath the part.
Keep the analog input traces short and guarded with a ground trace on each side to minimize crosstalk between channels in the MUX. Route the parallel data outputs (DB0-DB7) and control lines (CS, RD, A0-A2) away from the analog input traces, and place the ADC close to the microcontroller so the digital bus traces remain short. The PLCC J-Lead package has generous lead spacing that simplifies hand-rework and probe access during prototype bring-up.
Do not apply analog inputs below AGND or above VREF; the ADC's input range is 0 V to VREF, and out-of-range signals can latch up the input ESD structure. If a bipolar input signal must be measured, add a resistor-divider or level-shift network ahead of the input pin and confirm the divider impedance is low enough to drive the ADC's sample-and-hold capacitor within the acquisition window. Do not leave unused analog inputs floating - tie them to AGND through a resistor to prevent the MUX from settling on a noisy floating node.
The on-chip track-and-hold can digitize full-scale signals up to 10 kHz (157 mV/µs slew rate). For input signals above 10 kHz, expect reduced amplitude accuracy because the sample-and-hold cannot acquire the signal fast enough between conversions. If your application requires higher analog input bandwidth, either band-limit the input to 10 kHz with an external anti-alias filter, or migrate to a higher-bandwidth ADC such as the AD7623 or AD7641 family on XAIPART.
合规信息
RoHS compliance (lead-free termination) inferred from the Z suffix and the Analog Devices product page. REACH, halogen-free, and conflict-minerals statements are not explicitly stated in the verified web data and are marked [DATA_NEEDED] in this compliance record. The AD7828LPZ-REEL is not AEC-Q100 qualified - choose the AD7828KPZ-REEL variant for automotive applications requiring wider temperature ranges, or a true AEC-Q100 ADC for under-hood powertrain use.
