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Analog Devices Inc./Maxim Integrated MX7824KN+
- Part No.:
- MX7824KN+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
MX7824KN+.pdf
- Description:
- IC ADC 8BIT FLASH 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,290
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Product details
Overview
MX7824KN+ from Maxim Integrated is a high-speed, 4-channel, 8-bit analog-to-digital converter (ADC) with 2.5 µs conversion time, single +5V supply operation, and built-in track/hold. It features a 0V to +5V analog input range and interfaces directly to microprocessor data buses via latched three-state outputs - used in real-time data acquisition systems requiring deterministic timing and minimal external components.
For engineers reviewing the MX7824KN+ datasheet, MX7824KN+ pinout, MX7824KN+ application, or MX7824KN+ equivalent, key selection considerations include its 2.5 µs conversion time, ±1/2 LSB total unadjusted error, 24-pin narrow plastic DIP package, Mode 0/Mode 1 digital interface flexibility, and compatibility with AD7824 for legacy system upgrades.
Technical Context
The MX7824KN+ 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 front-end includes integrated sampling switches and comparator networks optimized for 1 µs tracking followed by 1.5 µs conversion completion.
Digital control relies solely on CS and RD inputs, supporting two modes: Mode 0 (WAIT-state compatible, INT- and RDY-driven handshaking) and Mode 1 (non-WAIT, overlapping conversion/read). The device uses no external clock and delivers latched, three-state DB0–DB7 outputs compatible with standard 8-bit microprocessor buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - provides 256 discrete output codes for digitizing analog signals within 0V to +5V range. |
| Conversion Time | 2.5 µs - enables up to 400 kHz maximum sampling rate per channel, 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 Range | 0V to +5V - referenced to VREF− (GND) and VREF+ (up to VDD), enabling direct connection to +5V-sourced sensors or op-amp outputs. |
| Supply Voltage | +5V only - eliminates need for dual supplies or voltage regulators; power dissipation is 25–75 mW depending on activity. |
| Digital Interface | CS + RD control only - no address decoding logic required; supports memory-mapped or I/O-mapped microprocessor access with no glue logic. |
| Track/Hold | Built-in - removes requirement for external sample-and-hold circuitry in most medium-bandwidth applications. |
Pinout & Package
MX7824KN+ is housed in a 24-pin narrow plastic DIP (Dual In-line Package) with 0.3-inch body width and 0.1-inch pin pitch, suitable for through-hole prototyping and industrial PCB assembly.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | AIN1 | Analog input channel 1 - accepts 0V to +5V signal; multiplexed with AIN2–AIN4 under A0/A1 control. |
| 2 | AIN2 | Analog input channel 2 - shares same internal sampling network and track/hold as AIN1–AIN4. |
| 3 | AIN3 | Analog input channel 3 - selected when A0=1, A1=0; input capacitance is 45 pF, requiring ≤100Ω source impedance for full accuracy. |
| 4 | AIN4 | Analog input channel 4 - final channel in 4-channel mux; settling time is internally fixed at ~1 µs before conversion begins. |
| 5 | A0 | Multiplexer address bit 0 - TTL-compatible input determining which of four analog channels is sampled during next conversion. |
| 6 | A1 | Multiplexer address bit 1 - used with A0 to select AIN1–AIN4; no internal pull-up/pull-down; must be driven. |
| 7 | NC | No connect - pin 7 is unconnected internally; must remain floating or grounded per layout best practice. |
| 8 | VDD | +5V power supply - bypass with 47 µF electrolytic + 0.1 µF ceramic capacitor close to pin to suppress switching noise. |
| 9 | DB0 | Data bus bit 0 (LSB) - three-state CMOS output; sinks 2.6 mA or sources 1.6 mA; high-impedance when CS high. |
| 10 | DB1 | Data bus bit 1 - latched output reflecting conversion result; timing referenced to RD/CS edges per Mode 0 or Mode 1 spec. |
| 11 | DB2 | Data bus bit 2 - valid after tACC1 (85 ns after RD low in Mode 0); compatible with 80Cxx, Z80, and 68000-family buses. |
| 12 | DB3 | Data bus bit 3 - shares same enable timing and loading characteristics as DB0–DB7; requires 50 pF max capacitive load for guaranteed timing. |
| 13 | RD | Read control input - falling edge initiates conversion in Mode 0; in Mode 1, it simultaneously reads prior result and starts new conversion. |
| 14 | DB4 | Data bus bit 4 - output remains in high-Z until conversion completes and RD/CS conditions are met per selected mode. |
| 15 | DB5 | Data bus bit 5 - driven only when CS is low and RD transitions appropriately; VOL = 0.4 V max at 2.6 mA sink. |
| 16 | DB6 | Data bus bit 6 - VOH = 4.0 V min at 1.6 mA source; compatible with TTL and CMOS logic families. |
| 17 | DB7 | Data bus bit 7 (MSB) - completes 8-bit parallel word; timing skew between DB0–DB7 is <5 ns over temperature. |
| 18 | CS | Chip-select input - active-low enable; must be stable before RD edge; controls output enable and internal state machine reset. |
| 19 | INT | Interrupt output - open-drain, active-low signal indicating conversion completion; requires external pull-up to VDD. |
| 20 | RDY | Ready output - open-drain status signal tied to microprocessor WAIT input; goes high-Z at end of conversion. |
| 21 | VREF− | Reference lower bound - sets zero-code point; connected to GND for standard 0V–5V operation. |
| 22 | VREF+ | Reference upper bound - sets full-scale code point; typically tied to VDD (+5V) unless external reference used. |
| 23 | GND | Analog/digital ground - single ground pin; recommended to tie AGND and DGND together at single point near VDD bypass. |
| 24 | TP (REF OUT) | Test point only - not connected internally on MX7824KN+; do not route or load; reserved for MAX154/MAX158 reference output. |
Key Features
| Feature | Design Value |
|---|---|
| One-chip data acquisition system | Integrates multiplexer, track/hold, 8-bit ADC core, reference interface, and parallel digital interface - reduces BOM count and board space vs. discrete solutions. |
| Built-in track/hold function | Eliminates need for external S/H IC or op-amp circuitry for signals with ≤157 mV/µs slew rate, simplifying front-end design. |
| 2.5 µs per-channel conversion | Enables real-time capture of fast transients in servo control and telecom monitoring without pipeline latency or FIFO buffering. |
| Single +5V supply operation | Removes requirement for ±12V or +3.3V/+5V dual-rail supplies, lowering system cost and improving power supply rejection ratio (PSRR). |
| No external clock required | Internal timing generator synchronizes sampling and conversion, removing clock distribution complexity and jitter sensitivity. |
| Pin-compatible with AD7824 | Direct drop-in replacement for Analog Devices AD7824 in existing designs - preserves PCB layout, firmware, and test fixtures. |
Applications
| High-Speed Data Acquisition | Digital Signal Processing |
|---|---|
Use Scenario: Real-time capture of vibration sensor outputs in predictive maintenance systems sampling at 100 kHz per channel. IC Role / Device Role / Timing Role: MX7824KN+ acts as the primary digitizer, performing synchronized 4-channel sampling with deterministic 2.5 µs conversion latency. Use Value: Enables detection of sub-millisecond mechanical anomalies without external track/hold or clock generation circuitry. |
Use Scenario: Front-end digitization in voiceband DSP systems processing eight simultaneous telephone lines. IC Role / Device Role / Timing Role: MX7824KN+ serves as channelized ADC feeding FIR filter coefficients into a dedicated DSP; operates in Mode 1 for continuous throughput. Use Value: Delivers 400 kHz aggregate sampling rate with hardware handshaking that eliminates software polling overhead. |
| Telecommunications Monitoring | High-Speed Servo Control |
Use Scenario: Line voltage and current sensing in DSLAM line cards for fault detection and loop qualification. IC Role / Device Role / Timing Role: MX7824KN+ digitizes conditioned analog feedback from current shunts and voltage dividers under microcontroller control. Use Value: ±1/2 LSB accuracy ensures precise RMS calculation over temperature; 0V–5V range matches standard op-amp output swing. |
Use Scenario: Position and velocity feedback digitization in closed-loop motor drives with 20 µs control loop cycles. IC Role / Device Role / Timing Role: MX7824KN+ provides time-aligned 4-channel ADC data to FPGA-based motion controller via parallel bus. Use Value: Built-in track/hold and 2.5 µs conversion allow sampling at 200 kHz per axis while maintaining phase coherence across channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel, 8-bit, high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7824BNZ | Pin-compatible but requires external reference; no internal track/hold; ±1 LSB total unadjusted error. | Requires external S/H and reference buffer for equivalent performance; less suitable for space-constrained layouts. | Select AD7824BNZ only if legacy AD7824 footprint reuse is mandatory and external component count is acceptable. |
| MAX154ACNG+ | Same pinout and timing; includes internal 2.5V reference and REF OUT pin; ±1/2 LSB error; SSOP option available. | Eliminates need for external reference circuitry; supports single-supply 0V–2.5V input range when using internal reference. | Choose MAX154ACNG+ when internal reference stability and reduced external parts outweigh DIP-to-SSOP rework cost. |
Compared with AD7824BNZ, MX7824KN+ offers superior integration with built-in track/hold and tighter error spec, while MAX154ACNG+ adds reference functionality at the cost of different thermal and mounting characteristics - all three share identical 4-channel mux and 2.5 µs conversion architecture.
Availability
MX7824KN+ is available at Aetrix Electronics and suitable for high-speed data acquisition, telecommunications infrastructure, and industrial servo control applications requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for MX7824KN+ 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 precision analog, mixed-signal, and high-speed data conversion ICs for industrial, communications, and computing markets.
The MX7824KN+ belongs to Maxim's legacy high-speed ADC product line, designed specifically for cost-sensitive, space-constrained systems needing deterministic 8-bit digitization without external timing or reference components.
FAQ
What is the maximum sampling rate achievable with the MX7824KN+?
The MX7824KN+ achieves a maximum sampling rate of 100 kHz per channel, calculated from its 2.5 µs conversion time plus minimum 500 ns delay between conversions (tP). This allows full utilization of its 4-channel multiplexer in time-interleaved acquisition without aliasing for input bandwidths up to 10 kHz. The MX7824KN+ does not require external clocking to sustain this rate.
Does the MX7824KN+ include an internal voltage reference?
No, the MX7824KN+ does not include an internal voltage reference. Unlike the MAX154/MAX158 family, the MX7824KN+ requires external reference connections at VREF+ and VREF− pins. It is specified for operation with VREF+ tied to VDD (+5V) and VREF− tied to GND, establishing a 0V to +5V input range. The REF OUT pin (pin 24) is a test point only and is not connected internally on the MX7824KN+.
Can the MX7824KN+ operate with a 3.3V microprocessor interface?
Yes, the MX7824KN+ can interface with 3.3V microprocessors, but only in Mode 0 with appropriate level translation. Its DB0–DB7 outputs are CMOS-compatible with VOH ≥ 4.0 V (min) and VOL ≤ 0.4 V (max) at rated loads, so direct connection to 3.3V inputs risks overvoltage. Use resistor-divider networks or dual-supply level translators on data lines; control inputs (CS, RD, A0, A1) accept TTL thresholds and may connect directly if 3.3V logic high exceeds 2.4V.
What is the purpose of the RDY and INT pins on the MX7824KN+?
The RDY pin is an open-drain ready signal intended for connection to a microprocessor's WAIT input - it goes low when CS falls and returns to high-impedance when conversion completes, enabling hardware wait-state insertion. The INT pin is also open-drain and asserts low upon conversion completion, providing interrupt-driven data read capability. Both require external pull-up resistors to VDD; RDY supports Mode 0 timing, while INT works in both Mode 0 and Mode 1.
Is the MX7824KN+ pin-compatible with the AD7824?
Yes, the MX7824KN+ is explicitly designed as a pin-compatible replacement for Analog Devices' AD7824. Pin functions, ordering codes (e.g., BNZ vs. KN+), and electrical timing parameters match closely enough to permit drop-in substitution in existing PCBs. However, MX7824KN+ offers improved specifications including ±1/2 LSB total unadjusted error versus AD7824's ±1 LSB, and guaranteed built-in track/hold performance.
MX7824KN+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 400k
- Number of Inputs:
- 4
- 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:
- 24-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MX7824KN+ FAQ
1.How can I place an order for MX7824KN+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MX7824KN+ 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 MX7824KN+ reliable?
The price and inventory of MX7824KN+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MX7824KN+ is usually 5 days.
3.What payment methods are accepted for MX7824KN+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MX7824KN+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MX7824KN+?
MX7824KN+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MX7824KN+ 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 MX7824KN+?
For technical support, including MX7824KN+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MX7824KN+ requirements.
6.How does Aetrix verify that MX7824KN+ is sourced from the original manufacturer or authorized distributors?
All MX7824KN+ 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 MX7824KN+ meets industry standards.
7.What is the process for return or replacement of MX7824KN+?
All MX7824KN+ units undergo pre-shipment inspection (PSI). If there is an issue with MX7824KN+, 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 MX7824KN+ part is unused and in its original packaging.
Return procedure for MX7824KN+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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