AD7828LPZ-REEL - 8-Bit 8-Ch 50kSPS Half-Flash ADC | Analog Devices
MPN: AD7828LPZ-REEL ✓ Hoạt độngAD7828LPZ-REEL Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho AD7828LPZ-REEL — 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 AD7828LPZ-REEL (cùng hình factor và footprint) — khác nhau ở Architecture, Data Interface, Operating Temperature, Package / Case, Process Technology.
AD7828KPZ-REEL
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD7828LPZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7828LP-REEL
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7828KP-REEL
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7828KNZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7828LPZ-REEL Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 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) |
| Điện áp cung cấp | 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) |
| Nhiệt độ hoạt động | 0 °C to +125 °C (see _validation_note) |
| Hộp / Vỏ | 28-PLCC (J-Lead), 11.51 mm × 11.51 mm |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tape & Reel (REEL) |
| Process Technology | LC²MOS (Linear-Compatible CMOS, ion-implanted) |
Cấu hình chân AD7828LPZ-REEL
| Chân 1 | DB0 — Data output Bit 0 (three-state) |
| Chân 2 | DB1 — Data output Bit 1 (three-state) |
| Chân 3 | DB2 — Data output Bit 2 (three-state) |
| Chân 4 | DB3 — Data output Bit 3 (three-state) |
| Chân 5 | DB4 — Data output Bit 4 (three-state) |
| Chân 6 | DB5 — Data output Bit 5 (three-state) |
| Chân 7 | DB6 — Data output Bit 6 (three-state) |
| Chân 8 | DB7 — Data output Bit 7 (three-state, MSB) |
| Chân 9 | AGND — Analog ground |
| Chân 10 | VDD — +5 V supply |
| Chân 11 | VREF — Reference voltage input (tie to VDD for 0-5 V range) |
| Chân 12 | AIN1 — Analog input channel 1 |
| Chân 13 | AIN2 — Analog input channel 2 |
| Chân 14 | AIN3 — Analog input channel 3 |
| Chân 15 | AIN4 — Analog input channel 4 |
| Chân 16 | AIN5 — Analog input channel 5 |
| Chân 17 | AIN6 — Analog input channel 6 |
| Chân 18 | AIN7 — Analog input channel 7 |
| Chân 19 | AIN8 — Analog input channel 8 |
| Chân 20 | NC — Not connected (per datasheet) |
| Chân 21 | MODE — Mode select input |
| Chân 22 | A0 — Channel address bit 0 (LSB) |
| Chân 23 | A1 — Channel address bit 1 |
| Chân 24 | A2 — Channel address bit 2 (MSB) |
| Chân 25 | EOC — End-of-conversion output |
| Chân 26 | RD — Read input (active low) |
| Chân 27 | CS — Chip select input (active low) |
| Chân 28 | DGND — Digital ground |
Ứng dụng tiêu biểu
AD7828LPZ-REEL phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7828LPZ-REEL — 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 | 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 |
Bảo phân biệt quan trọng
- Single +5 V supply with 8 channels of half-flash conversion (vsAD7828LPZ (tube variant))
- Higher operating-temperature grade available on the same footprint (vsAD7828LPZ-REEL)
- Half-flash architecture gives deterministic 2.5 µs conversion (vsTypical SAR ADC of equivalent resolution)
- On-chip track-and-hold on every channel (vsDiscrete MUX + ADC solutions)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
