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Analog Devices Inc./Maxim Integrated MX7828KP+
- Part No.:
- MX7828KP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
MX7828KP+.pdf
- Description:
- IC ADC 8BIT FLASH 28PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,034
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Product details
Overview
MX7828KP+ from Maxim Integrated is an 8-bit, 8-channel high-speed analog-to-digital converter (ADC) with 2.5 µs conversion time, single +5V supply operation, built-in track/hold, and ±1/2 LSB total unadjusted error. It interfaces directly to microprocessor data buses via latched three-state outputs and supports Mode 0/Mode 1 digital control for WAIT-state or non-WAIT systems - used in real-time speech analysis and high-speed servo control.
For engineers reviewing the MX7828KP+ datasheet, MX7828KP+ pinout, MX7828KP+ application, or MX7828KP+ equivalent, key selection criteria include channel count (8), conversion speed (2.5 µs), reference configuration (external VREF±), operating temperature range (0°C to +70°C), and PLCC-28 package compatibility with legacy AD7828-based designs.
Technical Context
The MX7828KP+ employs a half-flash architecture with two 4-bit flash ADC sections and an internal DAC to generate the lower 4 bits from the residue voltage. Its analog input range is defined by externally applied VREF+ and VREF− (0V to VDD), supporting unipolar 0V–5V or bipolar ±4V operation with external signal conditioning.
Digital interface uses only CS and RD signals, with two operational modes: Mode 0 (WAIT-state compatible, INT/RDY status signaling) and Mode 1 (non-WAIT, pipelined read of prior result). Input acquisition is internally timed (~1 µs tracking), requiring source impedance ≤100 Ω to avoid settling errors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes for digitizing analog sensor or signal chain outputs. |
| Conversion Time | 2.5 µs - enables up to 400 kHz aggregate sampling rate (tCRD + tp = 2.5 µs), sufficient for 10 kHz sinusoidal inputs without external track/hold. |
| Total Unadjusted Error | ±1/2 LSB - guarantees monotonicity and no missing codes across full temperature range (0°C to +70°C). |
| Analog Input Channels | 8-channel multiplexer - selects one of eight single-ended inputs (AIN1–AIN8) using A0/A1/A2 address lines. |
| Supply Voltage | +5V single supply - eliminates need for dual rails; VDD tolerance is ±5% (4.75V–5.25V) for specified performance. |
| Reference Interface | VREF+ and VREF− pins - define zero-code (VREF−) and full-scale (VREF+) voltage; supports external references or power-supply-derived scaling. |
| Output Interface | Latched three-state DB0–DB7 - directly connects to 8-bit microprocessor data bus without glue logic; RD/CS control initiates conversion and enables data read. |
Pinout & Package
MX7828KP+ is housed in a 28-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead geometry, rated for 0°C to +70°C operation. Pin 1 is located at the index corner (notch side, top-left when notch faces up).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | AIN1 | Analog input channel 1 - single-ended input referenced to GND; part of 8-channel multiplexer. |
| 2 | AIN2 | Analog input channel 2 - shares same input structure and settling requirements as AIN1. |
| 3 | AIN3 | Analog input channel 3 - requires ≤100 Ω source impedance for full 2.5 µs conversion accuracy. |
| 4 | AIN4 | Analog input channel 4 - valid in all operating modes; selected when A2A1A0 = 011. |
| 5 | AIN5 | Analog input channel 5 - enabled only on MX7828 variants; selected when A2A1A0 = 100. |
| 6 | AIN6 | Analog input channel 6 - supports high-speed acquisition in real-time filtering applications. |
| 7 | AIN7 | Analog input channel 7 - used in multi-channel speech analysis systems (e.g., Figure 12). |
| 8 | AIN8 | Analog input channel 8 - final channel in 8-input sequence; selected when A2A1A0 = 111. |
| 9 | A0 | Multiplexer address bit 0 - LSB of 3-bit channel select; sampled on falling edge of CS/RD. |
| 10 | A1 | Multiplexer address bit 1 - middle bit; determines channel group (e.g., A1=0 → channels 1–4). |
| 11 | A2 | Multiplexer address bit 2 - MSB; distinguishes MX7824 (4-channel, A2 not used) from MX7828 (8-channel, A2 active). |
| 12 | VREF− | Reference lower span - sets zero-code voltage; must be ≥ GND and ≤ VREF+. |
| 13 | VREF+ | Reference upper span - sets full-scale voltage; range is VREF− to VDD (max +5V). |
| 14 | GND | Analog/digital ground - common return for VREF−, analog inputs, and digital logic; requires low-impedance connection. |
| 15 | INT | Interrupt output - open-drain, active-low signal indicating conversion completion; used for CPU interrupt or polling. |
| 16 | RDY | Ready output - open-drain, active-low during conversion; connects to microprocessor WAIT input in Mode 0. |
| 17 | CS | Chip-select input - active-low enable; latches address and initiates conversion when RD also low. |
| 18 | RD | Read input - active-low control; in Mode 0, held low until conversion ends; in Mode 1, pulsed for pipelined access. |
| 19 | DB0 | Data bit 0 (LSB) - three-state output; driven after conversion completes; high-impedance when CS high. |
| 20 | DB1 | Data bit 1 - synchronized to RD/CS timing; meets tACC1 = 1.6 µs access spec under load. |
| 21 | DB2 | Data bit 2 - part of latched 8-bit parallel output bus; compatible with standard 8080/6800-style microprocessor interfaces. |
| 22 | DB3 | Data bit 3 - shares same timing and drive strength (IOH = −360 µA, IOL = 1.6 mA) as other DBx pins. |
| 23 | DB4 | Data bit 4 - designed for direct connection to data bus without level-shifting or buffering. |
| 24 | DB5 | Data bit 5 - maintains 0.4 V low / 2.4 V high voltage specs across temperature and supply variation. |
| 25 | DB6 | Data bit 6 - exhibits ≤8 pF output capacitance, minimizing bus loading in high-speed systems. |
| 26 | DB7 | Data bit 7 (MSB) - final bit of conversion result; transitions within tDH = 40 ns hold time after RD deassertion. |
| 27 | VDD | +5V supply - powers analog core, digital logic, and internal comparators; bypassed with 47 µF + 0.1 µF capacitors. |
| 28 | TP (REF OUT) | Test point - no connection required; not functional on MX7828KP+ (internal reference only on MAX158). |
Key Features
| Feature | Design Value |
|---|---|
| Built-in track/hold | Eliminates external sample-and-hold circuitry; supports direct connection of op-amp drivers with ≤100 Ω source impedance. |
| No external clock required | Internal timing generator synchronizes conversion and data output - simplifies system clock tree design. |
| Microprocessor bus interface | Latched three-state outputs allow direct attachment to 8-bit data buses (e.g., 8080, Z80, 6800) without address decoding logic. |
| Two digital interface modes | Mode 0 supports WAIT-state microprocessors; Mode 1 enables pipelined operation for non-WAIT architectures. |
| Pin compatibility with AD7828 | Direct replacement for Analog Devices AD7828 in PLCC-28 footprint - enables drop-in upgrade path in legacy designs. |
Applications
| Speech Analysis System | High-Speed Servo Control |
|---|---|
Use Scenario: Real-time spectral analysis of voice signals using banked bandpass filters feeding into parallel ADC channels. IC Role / Device Role / Timing Role: MX7828KP+ digitizes filtered audio outputs from 8 independent channels at 400 kHz aggregate rate, enabling frame-based FFT processing. Use Value: 2.5 µs conversion time ensures minimal inter-channel skew; ±1/2 LSB error preserves dynamic range for SNR-critical speech features. |
Use Scenario: Closed-loop position/velocity feedback in industrial motion controllers with sub-millisecond response requirements. IC Role / Device Role / Timing Role: MX7828KP+ acquires encoder, current-sense, and temperature signals simultaneously for multi-axis PID computation. Use Value: Built-in track/hold and 8-channel mux reduce board space vs. discrete ADCs; single +5V supply simplifies power architecture. |
| Digital Signal Processing Front-End | Telecom Channel Monitoring |
Use Scenario: Digitizing baseband I/Q signals in software-defined radio receivers prior to FPGA-based demodulation. IC Role / Device Role / Timing Role: MX7828KP+ serves as analog front-end ADC with external VREF± for precise gain/offset calibration across 8 RF paths. Use Value: VREF+ and VREF− pins allow programmable full-scale adjustment; 8-channel capability supports MIMO or diversity reception. |
Use Scenario: Monitoring line voltage, current, and noise margin across 8 subscriber lines in DSLAM or PON OLT equipment. IC Role / Device Role / Timing Role: MX7828KP+ performs periodic health checks on copper/fiber interfaces using multiplexed analog sensor inputs. Use Value: PLCC-28 package provides mechanical robustness for telecom chassis; 0°C to +70°C rating matches NEBS Level 3 ambient specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit, 8-channel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Analog Devices AD7828KPZ | Same PLCC-28 pinout, identical 8-channel mux and timing; ±1 LSB max error (vs. MX7828KP+'s ±1/2 LSB). | AD7828KPZ lacks guaranteed monotonicity over full temperature range; less suitable for precision closed-loop control. | Select MX7828KP+ when ±1/2 LSB error and no missing codes are required across 0°C to +70°C. |
| Maxim MAX158CNG+ | Same die family but includes internal 2.5V reference and REF OUT pin; PLCC-28 package, 0°C to +70°C. | MAX158CNG+ cannot use external VREF±; unsuitable where programmable full-scale or bipolar input scaling is needed. | Choose MX7828KP+ when external reference flexibility (e.g., ±4V bipolar, ratiometric sensing) is mandatory. |
Compared with AD7828KPZ, MX7828KP+ offers tighter DC accuracy (±1/2 LSB vs. ±1 LSB) and guaranteed monotonicity; compared with MAX158CNG+, it provides full external reference control at the cost of losing the integrated reference - making MX7828KP+ optimal for calibrated, multi-range analog front-ends.
Availability
MX7828KP+ is available at Aetrix Electronics and suitable for high-speed data acquisition, telecommunications infrastructure, and industrial servo control requiring stable component supply across extended production cycles.
Supply support for MX7828KP+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The MX7824/MX7828 product line was designed for high-speed, multi-channel digitization in resource-constrained embedded systems - emphasizing low-power, single-supply operation and microprocessor-friendly digital interfacing without external clocks or logic.
FAQ
What is the maximum sampling rate achievable with the MX7828KP+?
The MX7828KP+ achieves a maximum aggregate sampling rate of 400 kHz, calculated as 1 / (tCRD + tp) = 1 / (2.5 µs + 0 ns) = 400 kHz. This allows up to 50 kHz per channel when all 8 inputs are cycled - well above the Nyquist rate for 10 kHz bandwidth signals. The MX7828KP+ does not require external clocking, as timing is fully internal.
Does the MX7828KP+ include an internal voltage reference?
No, the MX7828KP+ does not include an internal voltage reference. Unlike the MAX158, it relies entirely on external VREF+ and VREF− connections to define its analog input range. The TP (REF OUT) pin is a test point only and must remain unconnected. Reference stability and accuracy are therefore determined by the external circuitry driving VREF+ and VREF−.
Which package type and temperature grade does the MX7828KP+ use?
The MX7828KP+ uses a 28-pin Plastic Leaded Chip Carrier (PLCC) package and is rated for operation from 0°C to +70°C. The "KP" suffix explicitly denotes PLCC-28 and commercial temperature range, distinguishing it from SSOP (KEAI/LEAI), CERDIP (TQ/UQ), or DIP (KN/LN) variants.
Can the MX7828KP+ be used in bipolar input applications?
Yes, the MX7828KP+ supports bipolar input operation when paired with external signal conditioning. By applying appropriate offset and scaling (e.g., using the circuit in Figure 10a), ±4V inputs can be mapped to the 0V–5V input range. The VREF+ and VREF− pins allow flexible reference setup - critical for accurate bipolar digitization without internal reference limitations.
Is the MX7828KP+ pin-compatible with the AD7828?
Yes, the MX7828KP+ is pin-compatible with Analog Devices' AD7828 in PLCC-28 packages. Both share identical pin functions, timing behavior, and electrical specifications - enabling direct replacement in existing AD7828-based PCB layouts without modifications. This compatibility is explicitly stated in the datasheet's General Description section.
MX7828KP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 400k
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Flash
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- Selectable Address
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-PLCC (11.51x11.51)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MX7828KP+ FAQ
1.How can I place an order for MX7828KP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MX7828KP+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MX7828KP+ reliable?
The price and inventory of MX7828KP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MX7828KP+ is usually 5 days.
3.What payment methods are accepted for MX7828KP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MX7828KP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MX7828KP+?
MX7828KP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MX7828KP+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MX7828KP+?
For technical support, including MX7828KP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MX7828KP+ requirements.
6.How does Aetrix verify that MX7828KP+ is sourced from the original manufacturer or authorized distributors?
All MX7828KP+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MX7828KP+ meets industry standards.
7.What is the process for return or replacement of MX7828KP+?
All MX7828KP+ units undergo pre-shipment inspection (PSI). If there is an issue with MX7828KP+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MX7828KP+ part is unused and in its original packaging.
Return procedure for MX7828KP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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