MX7828LCWI+T - 8-Bit 8-Ch 400kSPS Parallel ADC | Maxim Integrated
MPN: MX7828LCWI+T ✓ فعالMX7828LCWI+T جائزہ
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.
کے لیے ڈراپ اِن متبادل MX7828LCWI+T — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں MX7828LCWI+T (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Package / Case.
MX7828LCWI+
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
MX7828KCWI+T
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MX7828LCWI
✅ ڈراپ-اِن ⚠️ تفصیلات غیر تصدیق شدہ📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
MX7828LCWI+T زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Number of Bits | 8 |
| Number of Inputs | 8 |
| سیمپلنگ ریٹ | 400 kSPS |
| Architecture | Flash / Semi-Flash |
| Data Interface | Parallel |
| پیکیج / کیس | 28-SOIC (0.295 in / 7.50 mm width) |
| پنز کی تعداد | 28 |
| سپلائی وولٹیج | +5 V (single supply) |
| Reference Type | Internal (2.5 V) |
| Temperature Grade | Commercial |
| Packaging | Tape & Reel (TR) |
| ماؤنٹنگ ٹائپ | Surface Mount |
| Terminal Form | Gull Wing |
| Package Code | SOP |
MX7828LCWI+T پن کنفیگریشن
| پن 1 | IN0 — Analog input channel 0 |
| پن 2 | IN1 — Analog input channel 1 |
| پن 3 | IN2 — Analog input channel 2 |
| پن 4 | IN3 — Analog input channel 3 |
| پن 5 | IN4 — Analog input channel 4 |
| پن 6 | IN5 — Analog input channel 5 |
| پن 7 | IN6 — Analog input channel 6 |
| پن 8 | IN7 — Analog input channel 7 |
| پن 9 | AGND — Analog ground |
| پن 10 | VREF — Voltage reference input/output (internal 2.5 V) |
| پن 11 | VDD — +5 V supply |
| پن 12 | DGND — Digital ground |
| پن 13 | A0 — MUX address line 0 |
| پن 14 | A1 — MUX address line 1 |
| پن 15 | A2 — MUX address line 2 |
| پن 16 | WR/RD — Write/Read mode select |
| پن 17 | CONVST — Conversion start input |
| پن 18 | INT — Interrupt output (end-of-conversion) |
| پن 19 | MODE — Mode select (RD vs WR-RD) |
| پن 20 | DB7 — Data output bit 7 (MSB) |
| پن 21 | DB6 — Data output bit 6 |
| پن 22 | DB5 — Data output bit 5 |
| پن 23 | DB4 — Data output bit 4 |
| پن 24 | DB3 — Data output bit 3 |
| پن 25 | DB2 — Data output bit 2 |
| پن 26 | DB1 — Data output bit 1 |
| پن 27 | DB0 — Data output bit 0 (LSB) |
| پن 28 | NC — Not connected (per datasheet) |
عام استعمالات
MX7828LCWI+T کے لیے موزوں ہے 6 ایپلیکیشنs: 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.
تجویز کردہ
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.
تجویز کردہ
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.
تجویز کردہ
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.
تجویز کردہ
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.
تجویز کردہ
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.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا MX7828LCWI+T — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
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متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | 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 |
اہم امتیازی خصوصیات
- 8 single-ended analog input channels in a single 28-SOIC (بمقابلہMX7824 (4-channel variant))
- Internal 2.5 V reference eliminates external reference IC (بمقابلہADC0820 (external reference required))
- Parallel 8-bit output eliminates serial firmware overhead (بمقابلہMAX11128 (12-bit SPI SAR ADC))
ڈیزائن نوٹس
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.
تعمیل کی معلومات
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.
