MX7828LCWI+T - 8-Bit 8-Ch 400kSPS Parallel ADC | Maxim Integrated
MPN: MX7828LCWI+T ✓ Hoạt độngMX7828LCWI+T Tóm tắt
An ADC (analog-to-digital converter) is a data-conversion integrated circuit that quantizes a continuous analog input voltage into a discrete digital code. The MX7828 belongs to the successive-approximation / semi-flash ADC family, which sits in the broader hierarchy of mixed-signal data converter ICs. Eight-bit converters such as the MX7828 are commonly used in cost-sensitive embedded designs where moderate resolution is sufficient, and the 400 kSPS throughput is adequate for control-loop or instrumentation sampling rather than high-precision signal processing.
Key features include 400 kSPS guaranteed sampling rate, 8 analog input channels with on-chip mux, parallel 8-bit digital output, single +5 V supply operation, an internal reference of 2.5 V, and a track/hold amplifier that simplifies front-end design. The 28-SOIC (wide-body) package provides easy hand-solderability for prototyping and is widely accepted by automated surface-mount lines.
The MX7828 uses a semi-flash architecture that combines two 4-bit flash stages to reach 8-bit resolution in fewer comparators than a true flash ADC, reducing die area and power consumption while still delivering 400 kSPS conversion rates. This architecture is a strong fit for medium-speed embedded data-acquisition systems.
Typical applications include process-control data acquisition boards, multi-channel sensor monitoring (temperature, pressure, strain-gauge bridges), industrial front-ends, portable instrumentation, and digital panel-meter designs. The 8-input mux also supports scanned battery-monitoring systems.
When designing with the MX7828, drive the analog inputs with low-impedance sources (≤ 50 ohm) and bypass VDD with a 0.1 uF ceramic capacitor placed within 3 mm of the supply pin to minimize digital switching noise on the analog rail.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho MX7828LCWI+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 MX7828LCWI+T (cùng hình factor và footprint) — khác nhau ở Package / Case.
MX7828LCWI+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MX7828KCWI+T
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MX7828LCWI
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MX7828LCWI+T Tỷ lệ tối đa & tính chất điện
| Number of Bits | 8 |
| Number of Inputs | 8 |
| Tỷ lệ lấy mẫu | 400 kSPS |
| Architecture | Flash / Semi-Flash |
| Data Interface | Parallel |
| Hộp / Vỏ | 28-SOIC (0.295 in / 7.50 mm width) |
| Số lượng chân | 28 |
| Điện áp cung cấp | +5 V (single supply) |
| Reference Type | Internal (2.5 V) |
| Temperature Grade | Commercial |
| Packaging | Tape & Reel (TR) |
| Kiểu lắp đặt | Surface Mount |
| Terminal Form | Gull Wing |
| Package Code | SOP |
Cấu hình chân MX7828LCWI+T
| Chân 1 | IN0 — Analog input channel 0 |
| Chân 2 | IN1 — Analog input channel 1 |
| Chân 3 | IN2 — Analog input channel 2 |
| Chân 4 | IN3 — Analog input channel 3 |
| Chân 5 | IN4 — Analog input channel 4 |
| Chân 6 | IN5 — Analog input channel 5 |
| Chân 7 | IN6 — Analog input channel 6 |
| Chân 8 | IN7 — Analog input channel 7 |
| Chân 9 | AGND — Analog ground |
| Chân 10 | VREF — Voltage reference input/output (internal 2.5 V) |
| Chân 11 | VDD — +5 V supply |
| Chân 12 | DGND — Digital ground |
| Chân 13 | A0 — MUX address line 0 |
| Chân 14 | A1 — MUX address line 1 |
| Chân 15 | A2 — MUX address line 2 |
| Chân 16 | WR/RD — Write/Read mode select |
| Chân 17 | CONVST — Conversion start input |
| Chân 18 | INT — Interrupt output (end-of-conversion) |
| Chân 19 | MODE — Mode select (RD vs WR-RD) |
| Chân 20 | DB7 — Data output bit 7 (MSB) |
| Chân 21 | DB6 — Data output bit 6 |
| Chân 22 | DB5 — Data output bit 5 |
| Chân 23 | DB4 — Data output bit 4 |
| Chân 24 | DB3 — Data output bit 3 |
| Chân 25 | DB2 — Data output bit 2 |
| Chân 26 | DB1 — Data output bit 1 |
| Chân 27 | DB0 — Data output bit 0 (LSB) |
| Chân 28 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
MX7828LCWI+T phù hợp cho 6 Áp dụngs: Multi-Channel Process Control Data Acquisition, Industrial Sensor Monitoring Board, Portable Test & Measurement Instrument, Digital Panel Meter Design, Battery Monitoring & Management System, Embedded Microcontroller Sensor Interface.
Multi-Channel Process Control Data Acquisition
The MX7828LCWI+T fits multi-channel process-control DAQ boards where 8 input channels and 400 kSPS throughput are sufficient. Its 8-bit parallel output and 8-to-1 input MUX allow one chip to scan up to 8 thermocouples, pressure transducers, or 4-20 mA loop outputs. Designers typically pair it with an external op-amp buffer (MAX4475) for signal conditioning and route the parallel bus to an 8051 or PIC microcontroller. Compared to a switching regulator front-end, the MX7828 draws under 15 mA on a +5 V rail, simplifying thermal layout.
Được đề xuất
Industrial Sensor Monitoring Board
For industrial sensor-monitoring boards scanning temperature, strain-gauge, or pressure sensors, the MX7828LCWI+T offers 8 single-ended inputs in a single 28-SOIC. Its internal 2.5 V reference simplifies the analog front-end and eliminates an external reference IC. Each conversion completes in 2.5 us, well below the 25 ms update period typical of thermocouple-based thermal monitoring. The wide-body SOIC is robust in factory-floor environments with hand-solderable pads for prototype rework.
Được đề xuất
Portable Test & Measurement Instrument
Handheld DMMs, bench-top multimeters, and portable calibrators use the MX7828LCWI+T to digitize multiple measurement channels at 400 kSPS. The single +5 V supply and internal reference reduce BOM cost and PCB area, which is critical for battery-powered enclosures. Designers often add an LCD driver such as the MAX7234 to display measurements and an RS-232 transceiver for PC logging. The 8-bit resolution is sufficient for bar-graph and digital readout applications.
Được đề xuất
Digital Panel Meter Design
Digital panel meters use the MX7828LCWI+T to digitize voltage or current measurements in the 0-5 V range. The parallel 8-bit interface simplifies display update logic with no serial protocol overhead, allowing direct connection to LED or LCD driver ICs. A typical panel meter uses one MX7828 channel for the main measurement and another for range/autoranging feedback. The 400 kSPS throughput ensures flicker-free display updates at refresh rates above 50 Hz.
Được đề xuất
Battery Monitoring & Management System
Multi-cell battery monitoring systems use the MX7828LCWI+T to scan up to 8 individual cell voltages through its input MUX. The 400 kSPS sampling rate allows real-time balancing decisions in Li-ion or lead-acid battery stacks. The internal 2.5 V reference provides adequate accuracy for state-of-charge estimation in 12 V or 24 V packs. A typical implementation pairs the MX7828 with a supervisor IC such as the MAX705 for undervoltage lockout and a MOSFET driver for cell balancing.
Được đề xuất
Embedded Microcontroller Sensor Interface
Embedded designs based on 8051, PIC, or AVR microcontrollers pair the MX7828LCWI+T with the MCU's external bus to add multi-channel analog input. The 8-bit parallel output maps directly to Port 0/Port 2 of an 8051, eliminating SPI or I2C firmware overhead. Designers use the WR/RDCONV input to trigger single conversions or free-running mode for continuous sampling. Typical designs use it for HVAC control, appliance sensor interfaces, and consumer electronics front-ends.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MX7828LCWI+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 | MX7828LCWI+ | MX7828KCWI+T | MX7828LCWI |
|---|---|---|---|---|
| Package | 28-SOIC (0.295 in / 7.50 mm) | 28-SOIC (0.295 in) - same | 28-SOIC (0.295 in) - same | 28-SOIC (0.295 in) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit |
| Sampling Rate | 400 kSPS | 400 kSPS | 400 kSPS | 400 kSPS |
| Number of Inputs | 8 | 8 | 8 | 8 |
| Architecture | Semi-Flash | Semi-Flash | Semi-Flash | Semi-Flash |
| Data Interface | Parallel | Parallel | Parallel | Parallel |
| Packaging | Tape & Reel | Tube | Tape & Reel | Tray |
| Temperature Grade | Commercial | Commercial | Extended | Commercial |
Bảo phân biệt quan trọng
- 8 single-ended analog input channels in a single 28-SOIC (vsMX7824 (4-channel variant))
- Internal 2.5 V reference eliminates external reference IC (vsADC0820 (external reference required))
- Parallel 8-bit output eliminates serial firmware overhead (vsMAX11128 (12-bit SPI SAR ADC))
Ghi chú thiết kế
The MX7828LCWI+T operates from a single +5 V supply and draws approximately 10 mA during continuous conversion. Place a 0.1 uF ceramic decoupling capacitor within 3 mm of the VDD pin (pin 11) and a 10 uF bulk capacitor at the PCB supply input. Keep analog and digital grounds separated at the IC and join them at a single star point beneath the converter to avoid digital switching noise coupling into analog inputs.
Route the parallel digital output bus (DB0-DB7, pins 20-27) away from the analog input traces (IN0-IN7, pins 1-8) to minimize digital-to-analog crosstalk. Use a ground guard trace between the analog and digital sections. The MX7828LCWI+T samples at 400 kSPS with a 2.5 us conversion window, so input settling time is critical - drive each analog input through a low-impedance buffer (op-amp output impedance < 50 ohm) to avoid conversion errors.
Do not leave any analog input floating - unused channels must be tied to AGND or a defined mid-supply voltage to prevent crosstalk. The MX7828LCWI+T requires the WR/RD input (pin 16) to be properly configured for either RD-mode or WR-RD mode before initiating conversion. Driving the analog inputs with source impedances above 1 kohm can introduce gain inaccuracies due to the input sampling capacitor; always use a buffer amplifier for high-impedance sources.
Thông tin tuân thủ
RoHS status not explicitly stated in verified data; lead-free is presumed based on Maxim Integrated's standard manufacturing practices for post-2005 SOIC parts. AEC-Q100 not applicable - this is a commercial-grade legacy ADC.
