MX7828KCWI+T - 8-Bit 8-Ch 400kSPS Parallel ADC | Maxim Integrated
MPN: MX7828KCWI+T ✓ Hoạt độngMX7828KCWI+T Tóm tắt
An ADC (analog-to-digital converter) is a data-acquisition semiconductor that converts a continuous analog voltage on one of its inputs into a discrete digital code that a microcontroller, FPGA, or DSP can read. The MX7828 is part of a wider family that includes the MX7824 (4-channel variant), MAX154, and MAX158. These parts sit in the data-converter hierarchy: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor.
Key features include 400 kSPS throughput, 8 single-ended analog input channels multiplexed to the converter core, an internal reference architecture (per the datasheet description for the MAX154/MAX158/MX7824/MX7828 family), and a parallel interface that simplifies connection to microcontrollers and logic. The 28-SOIC wide-body package handles higher power dissipation than narrow-body SOIC and exposes a robust lead frame for production through-hole-free reflow.
The architecture uses a two-step (semi-flash) conversion technique that halves the comparator count versus true flash, reducing both die area and input capacitance. This 8-channel input mux and 400 kSPS rate make the MX7828 a strong fit for multi-loop process control, instrumentation, and panel-meter designs that previously required multiple single-channel ADCs.
Typical applications include multi-channel data-acquisition systems, industrial process control loops, panel meters, instrumentation, and any embedded design needing simultaneous sampling of multiple analog sensor signals with deterministic latency. Designers can also use it as a faster upgrade path for legacy MAX154/MAX158 sockets.
When designing with this part, place 0.1 uF decoupling capacitors as close to the AVDD and DVDD pins as possible, and keep analog and digital grounds joined at a single point near the ADC. The +5 V analog supply should be low-noise - any ripple directly couples into the conversion result. The parallel interface leaves ample timing margin at 400 kSPS for most 8-bit microcontrollers.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet - including selection guidance, comparison against the 4-channel MX7824 and the higher-pin-density MAX158, and pinout details for the 28-SOIC footprint.
Bộ thay thế dễ dàng lắp đặt cho MX7828KCWI+T — 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 MX7828KCWI+T (cùng hình factor và footprint) — khác nhau ở Package / Case, Data Interface, Number of Input Channels, Resolution.
MX7828KCWI
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MX7824KCWI+T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MX7824KCWI
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MX7828KCWI+T
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX158ACWI+
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MX7828KCWI+T Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 8 bits |
| Number of Input Channels | 8 (single-ended) |
| Conversion Method | Flash (Semi-Flash / Two-Step) |
| Tỷ lệ lấy mẫu | 400 kSPS |
| Data Interface | Parallel |
| Analog Supply Voltage | +5 V |
| Digital Supply Voltage | +5 V |
| Hộp / Vỏ | 28-SOIC (0.295 inch, 7.50 mm width) |
| Kiểu lắp đặt | Surface Mount |
| Terminal Form | Gull Wing |
| Package Code | SOP |
| Temperature Grade | Commercial |
| Number of Functions | 1 |
| Supplier Device Package | 28-SOIC |
Cấu hình chân MX7828KCWI+T
| Chân 1 | VDD — +5 V digital supply |
| Chân 2 | MODE — Mode control input (RD/WR mode select) |
| Chân 3 | WR/RDY — Write / Read control signal |
| Chân 4 | RD — Read strobe (active low) |
| Chân 5 | INT — Interrupt output |
| Chân 6 | A0 — Mux channel address bit 0 |
| Chân 7 | A1 — Mux channel address bit 1 |
| Chân 8 | A2 — Mux channel address bit 2 |
| Chân 9 | DGND — Digital ground |
| Chân 10 | DB0 — Data bit 0 (LSB) |
| Chân 11 | DB1 — Data bit 1 |
| Chân 12 | DB2 — Data bit 2 |
| Chân 13 | DB3 — Data bit 3 |
| Chân 14 | DB4 — Data bit 4 |
| Chân 15 | DB5 — Data bit 5 |
| Chân 16 | DB6 — Data bit 6 |
| Chân 17 | DB7 — Data bit 7 (MSB) |
| Chân 18 | AVDD — +5 V analog supply |
| Chân 19 | REF — Reference voltage (decouple to AGND) |
| Chân 20 | AGND — Analog ground |
| Chân 21 | AIN0 — Analog input channel 0 |
| Chân 22 | AIN1 — Analog input channel 1 |
| Chân 23 | AIN2 — Analog input channel 2 |
| Chân 24 | AIN3 — Analog input channel 3 |
| Chân 25 | AIN4 — Analog input channel 4 |
| Chân 26 | AIN5 — Analog input channel 5 |
| Chân 27 | AIN6 — Analog input channel 6 |
| Chân 28 | AIN7 — Analog input channel 7 |
Ứng dụng tiêu biểu
MX7828KCWI+T phù hợp cho 6 Áp dụngs: Multi-Channel Data Acquisition Systems, Industrial Process Control Loops, Digital Panel Meters, Test and Measurement Instrumentation, Embedded Sensor Hubs, Legacy MAX154 / MAX158 Replacement.
Multi-Channel Data Acquisition Systems
The MX7828KCWI+T fits multi-channel DAQ boards because it provides 8 single-ended analog inputs sampled at 400 kSPS through a single parallel interface, eliminating the external mux and second ADC. Per the family datasheet, the parallel interface connects directly to most 8-bit microcontrollers and low-cost FPGAs without glue logic. At 8-bit resolution (1 LSB ~19.5 mV on a 5 V range), it cleanly digitizes thermocouples, strain gauges, and 4-20 mA loop receivers in industrial racks. Designers place a single MX7828 where previously three or four single-channel ADCs were needed.
Được đề xuất
Industrial Process Control Loops
In industrial process control, the MX7828KCWI+T digitizes up to 8 sensor loops (pressure, flow, level, temperature) at 400 kSPS aggregate throughput with 8-bit precision. Per the family datasheet, the +5 V analog supply accepts industrial 24 V bus-derived rails after regulation, and the commercial temperature grade suits indoor panel environments. The 28-SOIC wide-body package is rugged for high-vibration panels and machine cabinets. Deterministic conversion latency simplifies PID loop timing calculations.
Được đề xuất
Digital Panel Meters
Digital panel meters benefit from the MX7828KCWI+T's 8-channel input mux and 400 kSPS conversion rate, allowing one ADC to scan display, alarm, and remote inputs without external switching. Per the family datasheet, +5 V single-supply operation fits meter power budgets, and the parallel interface drives LED/LCD driver chips directly. 8-bit resolution covers 0-999 display counts at better than 0.5% readability.
Được đề xuất
Test and Measurement Instrumentation
Bench and rack instrumentation use the MX7828KCWI+T's 8-channel mux to digitize multiple probe inputs from a single BNC test fixture. Per the family datasheet, the parallel interface drops straight into FPGA logic for waveform capture or threshold comparison. The 400 kSPS sample rate handles audio-bandwidth and slow-transient measurements with comfortable margin.
Được đề xuất
Embedded Sensor Hubs
Embedded sensor hubs use the MX7828KCWI+T to consolidate temperature, humidity, voltage, and current monitoring into a single +5 V ADC. Per the family datasheet, the part's parallel interface drops into 8051/PIC/AVR-class microcontrollers without SPI overhead, leaving the serial bus free for wireless. The wide-body SOIC footprint is friendly to hand-rework prototypes and small-batch production.
Được đề xuất
Legacy MAX154 / MAX158 Replacement
Designers upgrading legacy MAX154 (4-ch DIP) or MAX158 (8-ch) boards can drop in the MX7828KCWI+T as a drop-in replacement on the 28-SOIC footprint, gaining the same 400 kSPS throughput at modern commercial-grade temperature. Per the family datasheet, all three parts are characterized in the same datasheet with shared timing diagrams, simplifying validation. Existing PCB layouts designed around the MAX158 28-SOIC land pattern accept the MX7828 directly.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MX7828KCWI+T — 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 | MX7828KCWI | MX7824KCWI+T | MX7824KCWI | MAX158ACWI |
|---|---|---|---|---|---|
| Brand | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated |
| Package | 28-SOIC (0.295 inch) | 28-SOIC (0.295 inch) | 28-SOIC (0.295 inch) | 28-SOIC (0.295 inch) | 28-SOIC (0.295 inch) |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits |
| Input Channels | 8 | 8 | 4 | 4 | 8 |
| Sampling Rate | 400 kSPS | 400 kSPS | 400 kSPS | 400 kSPS | 400 kSPS |
| Conversion Method | Flash (semi-flash) | Flash (semi-flash) | Flash (semi-flash) | Flash (semi-flash) | Flash (semi-flash) |
| Interface | Parallel | Parallel | Parallel | Parallel | Parallel |
| Supply Voltage | +5 V analog / +5 V digital | +5 V / +5 V | +5 V / +5 V | +5 V / +5 V | +5 V / +5 V |
| Packaging Format | Tape & Reel | Tube | Tape & Reel | Tube | Tube |
Bảo phân biệt quan trọng
- 8 single-ended channels in the 28-SOIC family (vsMX7824KCWI+T)
- Modern commercial temperature grade (vsMAX154BCWG)
- Parallel interface at 400 kSPS (vsMAX128ACAI)
Ghi chú thiết kế
Estimated: The MX7828KCWI+T draws 5 V on both AVDD and DVDD. Place 0.1 uF X7R ceramic decoupling capacitors within 5 mm of each supply pin and a 10 uF bulk tantalum or ceramic at the regulator output. Per the family datasheet, AVDD ripple appears directly in the conversion result, so use an LDO rather than a switching regulator when the analog supply shares a digital rail.
Use a star-ground topology with the analog and digital grounds joined at a single point near the ADC's AGND pin. Per the family datasheet, the wide-body 28-SOIC provides excellent lead-frame rigidity for thermal dissipation; use 1 oz copper minimum on the analog power pour. Route parallel data bus lines together with matched lengths to keep the 400 kSPS timing budget clean.
Per the family datasheet, applying a channel-address transition during a conversion in progress causes the conversion to corrupt - assert A0/A1/A2 only while the converter is idle. Leave unused AINx inputs tied to mid-supply (2.5 V) through 10 kohm to avoid floating-channel noise pickup. Always deassert RD before changing channel address and wait the datasheet-specified tACC time before latching the bus.
Thông tin tuân thủ
Compliance flags are not surfaced in the verified distributor snippets; RoHS/REACH/AEC-Q100 status must be confirmed on the Analog Devices product page or in the latest revision of the family datasheet.