MX7828KCWI+T - 8-Bit 8-Ch 400kSPS Parallel ADC | Maxim Integrated
MPN: MX7828KCWI+T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.42 | $8.42 |
| 10 | $7.58 | $75.80 |
| 100 | $6.74 | $674.00 |
| 500 | $5.91 | $2,955.00 |
| 1,000 | $5.07 | $5,070.00 |
MX7828KCWI+T Overview
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.
Drop-in alternatives for MX7828KCWI+T — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MX7828KCWI+T (same form factor and footprint) — differing in Data Interface, Number of Input Channels, Package / Case, Resolution.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MX7828KCWI
✅ Drop-In📋 Reference alternative (not in catalog)
MX7824KCWI+T
✅ Drop-In📋 Reference alternative (not in catalog)
MX7824KCWI
✅ Drop-In📋 Reference alternative (not in catalog)
MX7828KCWI+T
✅ Drop-In✓ In Stock
$5.07 / Unit
View Datasheet →MAX158ACWI+
✅ Drop-In✓ In Stock
$10.18 / Unit
View Datasheet →MX7828KCWI+T Maximum Ratings & Electrical Characteristics
| Resolution | 8 bits |
| Number of Input Channels | 8 (single-ended) |
| Conversion Method | Flash (Semi-Flash / Two-Step) |
| Sampling Rate | 400 kSPS |
| Data Interface | Parallel |
| Analog Supply Voltage | +5 V |
| Digital Supply Voltage | +5 V |
| Package / Case | 28-SOIC (0.295 inch, 7.50 mm width) |
| Mounting Type | Surface Mount |
| Terminal Form | Gull Wing |
| Package Code | SOP |
| Temperature Grade | Commercial |
| Number of Functions | 1 |
| Supplier Device Package | 28-SOIC |
MX7828KCWI+T Pin Configuration
| Pin 1 | VDD — +5 V digital supply |
| Pin 2 | MODE — Mode control input (RD/WR mode select) |
| Pin 3 | WR/RDY — Write / Read control signal |
| Pin 4 | RD — Read strobe (active low) |
| Pin 5 | INT — Interrupt output |
| Pin 6 | A0 — Mux channel address bit 0 |
| Pin 7 | A1 — Mux channel address bit 1 |
| Pin 8 | A2 — Mux channel address bit 2 |
| Pin 9 | DGND — Digital ground |
| Pin 10 | DB0 — Data bit 0 (LSB) |
| Pin 11 | DB1 — Data bit 1 |
| Pin 12 | DB2 — Data bit 2 |
| Pin 13 | DB3 — Data bit 3 |
| Pin 14 | DB4 — Data bit 4 |
| Pin 15 | DB5 — Data bit 5 |
| Pin 16 | DB6 — Data bit 6 |
| Pin 17 | DB7 — Data bit 7 (MSB) |
| Pin 18 | AVDD — +5 V analog supply |
| Pin 19 | REF — Reference voltage (decouple to AGND) |
| Pin 20 | AGND — Analog ground |
| Pin 21 | AIN0 — Analog input channel 0 |
| Pin 22 | AIN1 — Analog input channel 1 |
| Pin 23 | AIN2 — Analog input channel 2 |
| Pin 24 | AIN3 — Analog input channel 3 |
| Pin 25 | AIN4 — Analog input channel 4 |
| Pin 26 | AIN5 — Analog input channel 5 |
| Pin 27 | AIN6 — Analog input channel 6 |
| Pin 28 | AIN7 — Analog input channel 7 |
Typical Applications
MX7828KCWI+T is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for MX7828KCWI+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- 8 single-ended channels in the 28-SOIC family (vs MX7824KCWI+T)
- Modern commercial temperature grade (vs MAX154BCWG)
- Parallel interface at 400 kSPS (vs MAX128ACAI)
Design Notes
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.
Compliance Information
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.