MX7828LCWI+T - 8-Bit 8-Ch 400kSPS Parallel ADC | Maxim Integrated
料号： MX7828LCWI+T ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $7.95 | $7.95 |
| 10 | $7.2 | $72.00 |
| 100 | $6.45 | $645.00 |
| 500 | $5.7 | $2,850.00 |
| 1,000 | $5.05 | $5,050.00 |
MX7828LCWI+T 概述
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.
直接替换替代料： MX7828LCWI+T ——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： MX7828LCWI+T （相同外形与封装尺寸） ——差异在于 Package / Case.
快速对比工具——选择替代料号进行并排对比：
MX7828LCWI+
✅ 直接替换📋 参考替代料（不在目录中）
MX7828KCWI+T
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$5.07 / 个
查看数据手册 →MX7828LCWI
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MX7828LCWI+T 最大额定值与电气特性
| Number of Bits | 8 |
| Number of Inputs | 8 |
| 采样率 | 400 kSPS |
| Architecture | Flash / Semi-Flash |
| Data Interface | Parallel |
| 封装 / 外壳 | 28-SOIC (0.295 in / 7.50 mm width) |
| 引脚数 | 28 |
| 电源电压 | +5 V (single supply) |
| Reference Type | Internal (2.5 V) |
| Temperature Grade | Commercial |
| Packaging | Tape & Reel (TR) |
| 安装类型 | Surface Mount |
| Terminal Form | Gull Wing |
| Package Code | SOP |
MX7828LCWI+T 引脚配置
| 引脚 1 | IN0 — Analog input channel 0 |
| 引脚 2 | IN1 — Analog input channel 1 |
| 引脚 3 | IN2 — Analog input channel 2 |
| 引脚 4 | IN3 — Analog input channel 3 |
| 引脚 5 | IN4 — Analog input channel 4 |
| 引脚 6 | IN5 — Analog input channel 5 |
| 引脚 7 | IN6 — Analog input channel 6 |
| 引脚 8 | IN7 — Analog input channel 7 |
| 引脚 9 | AGND — Analog ground |
| 引脚 10 | VREF — Voltage reference input/output (internal 2.5 V) |
| 引脚 11 | VDD — +5 V supply |
| 引脚 12 | DGND — Digital ground |
| 引脚 13 | A0 — MUX address line 0 |
| 引脚 14 | A1 — MUX address line 1 |
| 引脚 15 | A2 — MUX address line 2 |
| 引脚 16 | WR/RD — Write/Read mode select |
| 引脚 17 | CONVST — Conversion start input |
| 引脚 18 | INT — Interrupt output (end-of-conversion) |
| 引脚 19 | MODE — Mode select (RD vs WR-RD) |
| 引脚 20 | DB7 — Data output bit 7 (MSB) |
| 引脚 21 | DB6 — Data output bit 6 |
| 引脚 22 | DB5 — Data output bit 5 |
| 引脚 23 | DB4 — Data output bit 4 |
| 引脚 24 | DB3 — Data output bit 3 |
| 引脚 25 | DB2 — Data output bit 2 |
| 引脚 26 | DB1 — Data output bit 1 |
| 引脚 27 | DB0 — Data output bit 0 (LSB) |
| 引脚 28 | NC — Not connected (per datasheet) |
典型应用
MX7828LCWI+T 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： MX7828LCWI+T ——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 | 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 |
关键差异点
- 8 single-ended analog input channels in a single 28-SOIC （对比 MX7824 (4-channel variant))
- Internal 2.5 V reference eliminates external reference IC （对比 ADC0820 (external reference required))
- Parallel 8-bit output eliminates serial firmware overhead （对比 MAX11128 (12-bit SPI SAR ADC))
设计说明
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.
合规信息
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.
