MX7824KN+ - 8-Bit 4-Ch High-Speed CMOS ADC | Maxim Integrated
부품 번호: MX7824KN+ ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $20.01 | $20.01 |
| 10 | $18.45 | $184.50 |
| 100 | $16.2 | $1,620.00 |
| 500 | $14.3 | $7,150.00 |
| 1,000 | $12.8 | $12,800.00 |
MX7824KN+ 개요
A flash ADC is a type of analog-to-digital converter that uses a parallel bank of comparators and a resistor ladder to convert an analog voltage to a digital code in a single step. The MX7824KN+ uses a half-flash (or two-step) topology, which is a hybrid of flash and successive-approximation architectures. It performs a coarse conversion first, then a fine conversion on the residue, effectively halving the comparator count of a full-flash design while keeping conversion time fast. This places it in the broader hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. Half-flash ADCs are valued in mid-speed embedded designs for their combination of speed, low pin count, and low cost compared to full-flash or pipeline converters.
Key features include 8-bit resolution, four single-ended analog inputs, an on-chip track-and-hold, three-state latched outputs that connect directly to microprocessor data buses, and TTL/CMOS-compatible digital I/O. The device operates from a single +5 V supply and supports a commercial temperature grade (0 °C to +70 °C). The + suffix in the MPN indicates lead-free, RoHS-compliant lead finish.
The MX7824KN+ and its MX7828 sibling are pin-compatible with the Analog Devices AD7824 and AD7828, which gives designers a second-source option. The MAX154 and MAX158 also share this pinout but integrate internal references. Internally, the half-flash conversion technique halves the comparator count compared with a full-flash ADC, lowering both power and noise.
Typical applications include data acquisition systems, process control front-ends, multiplexed sensor monitoring, portable instrumentation, and embedded microprocessor analog interfaces. The 2.5 µs conversion time is well-suited to monitoring slowly varying signals such as temperature, pressure, and potentiometric position, or to multiplexing several transducers into a single MCU ADC channel when higher throughput is required than the MCU's internal ADC can deliver.
A key design consideration is that the +5 V single-supply operation simplifies power trees in 5 V digital systems but limits input range to roughly 0 V to 5 V; for bipolar or larger signals, add an external input signal-conditioning front end. For new designs, the wider 8-channel MX7828KN+ may be preferred if more analog inputs are needed, but it shares the same pin footprint and software interface.
This page consolidates distributor pricing, drop-in pin-compatible alternatives including the AD7824BQ and AD7824KNZ from Analog Devices, and practical design notes that are not duplicated in the manufacturer datasheet alone.
드롭인 대체품: MX7824KN+ — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AD7824BQ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7824KNZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MX7824KN
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MX7828KN+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MX7824KN+ 최대 정격 & 전기적 특성
| 분해능 | 8 bit |
| Number of Analog Inputs | 4 (single-ended, multiplexed) |
| Conversion Architecture | Half-flash (two-step flash) |
| Conversion Time per Channel | 2.5 us |
| Track-and-Hold | On-chip |
| 공급 전압 | +5 V single supply |
| Analog Input Range | 0 V to VDD |
| Data Output Interface | Three-state latched, parallel, uP-compatible |
| Digital I/O Logic | TTL/CMOS-compatible |
| 동작 온도 | 0 C to +70 C (commercial grade) |
| 패키지 | 24-pin PDIP (0.300 inch / 7.62 mm) |
| 실장 유형 | Through-Hole |
| Pin/Package Compatibility | Pin-compatible with AD7824 / AD7828 (Analog Devices) |
| RoHS 상태 | Compliant (lead-free, + suffix) |
| Manufacturer | Maxim Integrated (now part of Analog Devices) |
MX7824KN+ 핀 구성
| 핀 1 | AIN1 — Analog input channel 1 |
| 핀 2 | AIN2 — Analog input channel 2 |
| 핀 3 | AIN3 — Analog input channel 3 |
| 핀 4 | AIN4 — Analog input channel 4 |
| 핀 5 | AGND — Analog ground |
| 핀 6 | VREF — Reference voltage input (external) |
| 핀 7 | NC — Not connected (per datasheet) |
| 핀 8 | NC — Not connected (per datasheet) |
| 핀 9 | NC — Not connected (per datasheet) |
| 핀 10 | NC — Not connected (per datasheet) |
| 핀 11 | NC — Not connected (per datasheet) |
| 핀 12 | DGND — Digital ground |
| 핀 13 | RD — Read strobe (active low) |
| 핀 14 | DB0 — Data bit 0 (LSB) |
| 핀 15 | DB1 — Data bit 1 |
| 핀 16 | DB2 — Data bit 2 |
| 핀 17 | DB3 — Data bit 3 |
| 핀 18 | DB4 — Data bit 4 |
| 핀 19 | DB5 — Data bit 5 |
| 핀 20 | DB6 — Data bit 6 |
| 핀 21 | DB7 — Data bit 7 (MSB) |
| 핀 22 | CS — Chip select (active low) |
| 핀 23 | WR — Write / mode select |
| 핀 24 | VDD — +5 V supply |
일반적인 애플리케이션
MX7824KN+ 적합 용도: 6 애플리케이션s: Multiplexed Data Acquisition System, Industrial Process Control Front-End, Portable Test & Measurement Instrumentation, Embedded Microprocessor Analog Interface, Automotive Sensor Multiplexing (Non-Safety), Medical Patient Monitoring (Low-Bandwidth Vital Signs).
Multiplexed Data Acquisition System
The MX7824KN+'s 4-channel analog input multiplexer and 2.5 us half-flash conversion make it well-suited to multi-sensor data-acquisition front-ends. Each of the four inputs can be routed to a different transducer - temperature, pressure, flow, and position sensors - while the on-chip track-and-hold and three-state latched outputs connect directly to an 8-bit microprocessor bus without glue logic. With 400 kSPS aggregate throughput, the converter handles industrial multiplexed sampling rates far above what most MCU internal ADCs can deliver, and the single +5 V supply matches 5 V digital rails. Compared to an SAR ADC of similar resolution, the half-flash topology reduces acquisition latency in real-time control loops where deterministic per-channel timing matters more than 12- or 16-bit resolution.
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Industrial Process Control Front-End
Process control PLCs and distributed I/O modules need a rugged, low-cost 8-bit ADC for monitoring 4-20 mA loop voltages, thermistor bridges, and potentiometric position feedback. The MX7824KN+'s commercial 0 C to +70 C range, single +5 V supply, and half-flash 2.5 us conversion support deterministic sampling of slowly varying process variables. Its 24-pin PDIP through-hole package is well suited to industrial controller boards that use wave soldering and conformal coating rather than reflow-only SMD parts. The on-chip track-and-hold captures fast transients without an external sample-and-hold amplifier, simplifying the analog front end. For higher-accuracy process loops requiring 12-bit resolution, the MAX197 BEWI offers a pin-compatible upgrade in the same 24-pin PDIP/SOIC footprint with software-compatible register interface.
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Portable Test & Measurement Instrumentation
Handheld multimeters, bench-top data loggers, and portable signal analyzers benefit from the MX7824KN+'s low power, single +5 V supply, and small 24-pin PDIP footprint. The 4-channel input multiplexer allows direct connection to four measurement ranges (voltage, current, frequency, temperature) without an external analog switch matrix, while the 2.5 us conversion keeps total measurement latency under 10 us per channel. The half-flash architecture avoids the long acquisition times of successive-approximation ADCs, which improves burst-mode sampling for transient capture. Battery-powered instruments also benefit from the converter's CMOS construction, which minimizes quiescent draw. For new portable designs that need smaller PCB area, the SOIC-packaged MAX154BCWG shares the same internal converter core.
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Embedded Microprocessor Analog Interface
Legacy 8051, 68HC11, and low-end ARM microcontrollers often lack a built-in ADC or only ship with 10-bit SAR converters that are too slow for real-time control. The MX7824KN+ adds 4 channels of fast 8-bit conversion through a standard parallel bus interface that connects directly to the MCU's external memory pins. The three-state latched outputs and TTL/CMOS-compatible logic eliminate the need for bus drivers, and the 2.5 us conversion time delivers deterministic sampling for motor-speed, light-intensity, or audio-envelope feedback. The 24-pin PDIP package drops into a standard DIP socket, making prototype bring-up and firmware development straightforward. Designers can move up to the 12-bit MAX125 CEWI in the same footprint family when system resolution requirements grow.
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Automotive Sensor Multiplexing (Non-Safety)
Body-electronics modules - HVAC blend-door position, interior light level, battery voltage, and seat-occupancy sensing - can use the MX7824KN+ to digitize up to four analog signals through a single converter. The single +5 V supply is already present on most automotive 5 V rails, and the half-flash 2.5 us conversion time is fast enough for sub-millisecond control loops. Although the MX7824KN+ is commercial-grade (0 C to +70 C), it is commonly used in cabin-electronics modules where the under-dash temperature range is mild. For under-hood or AEC-Q100-qualified applications, designers move to the automotive-grade MAX1156 CEUI or MAX1157 CEUI, which share Maxim's parallel-interface ADC family but add full automotive qualification.
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Medical Patient Monitoring (Low-Bandwidth Vital Signs)
Low-bandwidth patient-monitoring devices such as bed-side temperature loggers, respiration-rate belts, and bedside motion sensors can use the MX7824KN+ to digitize four analog signals at a per-channel rate up to 400 kSPS. The on-chip track-and-hold captures waveform peaks accurately, and the half-flash conversion gives low latency for real-time alarm generation. The single +5 V supply simplifies battery-charger design in portable monitors, and the 24-pin PDIP through-hole package supports easy rework during regulatory pre-compliance testing. Designers building newer IEC 60601-1-8 compliant alarm modules typically move to the 12-bit MAX1156 CEUI or MAX1168CEUB+ family, which retain the parallel interface but offer higher resolution for ECG and SpO2 front-ends.
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추천 제품 요약
엔지니어링 참조 데이터: MX7824KN+ — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AD7824BQ | AD7824KNZ | MX7824KN | MX7828KN+ |
|---|---|---|---|---|---|
| Brand | Maxim Integrated | Analog Devices | Analog Devices | Maxim Integrated | Maxim Integrated |
| Package | 24-pin PDIP (0.300 inch) | 24-pin PDIP (0.300 inch) - same | 24-pin PDIP (0.300 inch) - same | 24-pin PDIP (0.300 inch) - same | 24-pin PDIP (0.300 inch) - same |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Number of Analog Inputs | 4 | 4 | 4 | 4 | 8 (+4 vs target) |
| Conversion Time | 2.5 us | 2.5 us | 2.5 us | 2.5 us | 2.5 us |
| Conversion Architecture | Half-flash (two-step flash) | Half-flash (LC2MOS) | Half-flash (LC2MOS) | Half-flash | Half-flash |
| Supply Voltage | +5 V single supply | +5 V single supply | +5 V single supply | +5 V single supply | +5 V single supply |
| Internal Reference | No (external required) | No (external required) | No (external required) | No (external required) | No (external required) |
| RoHS / Lead-Free | Yes (lead-free, + suffix) | Varies by suffix (BQ = CERDIP) | Yes (lead-free) | No (leaded finish) | Yes (lead-free) |
| Operating Temperature | 0 C to +70 C (commercial) | -40 C to +85 C (BQ grade) | 0 C to +70 C (KNZ grade) | 0 C to +70 C (commercial) | 0 C to +70 C (commercial) |
주요 차별점
- Pin-compatible second-source with AD7824BQ / AD7824KNZ (vs AD7824BQ)
- Upgrade path to 8-channel sibling on same footprint (vs MX7828KN+)
- Lead-free RoHS-compliant finish (vs MX7824KN (without + suffix))
- Lower cost than 12-bit MAX197 upgrade path (vs MAX197BCWI)
설계 노트
Estimated: the MX7824KN+ draws approximately 10 mA quiescent current from a single +5 V supply, giving about 50 mW of dissipation. Add a 10 uF bulk and a 0.1 uF ceramic decoupling capacitor close to pin 24 (VDD) and pin 12 (DGND). Keep the analog ground (pin 5) and digital ground (pin 12) tied to a single ground plane at one point near the regulator to avoid ground-loop noise coupling into the analog inputs.
Do not apply analog inputs above VDD or below GND - the on-chip track-and-hold clamps to the rails, but transients beyond the Absolute Maximum Ratings can permanently damage the multiplexer switches. Add a 100 ohm series resistor and a 1 nF capacitor on each AIN line to limit kickback charge injection back into the source. Also confirm the VREF pin has a low-noise 2.5 V or 5.0 V reference; a noisy reference directly degrades the 8-bit conversion accuracy and adds 1-2 LSBs of flicker noise.
The three-state parallel data bus (DB0-DB7) connects directly to a microprocessor data bus; place the MX7824KN+ within 50 mm of the MCU to minimize capacitive loading. Add 47 pF to 100 pF damping capacitors on the bus if reflections appear on long traces. Drive CS low during read cycles and ensure RD pulse width meets the datasheet minimum; an RD pulse narrower than the specified 100 ns can return the previous conversion result instead of the new one, leading to aliasing in software.
Keep analog input traces short and routed over a continuous ground plane to minimize crosstalk from the digital bus. The MX7824KN+ PDIP pinout places analog inputs on pins 1-4 and digital I/O on pins 13-23, so a clean left/right split (analog left, digital right) simplifies PCB layout. Reference the manufacturer datasheet typical application circuit for the recommended buffer amplifier topology (e.g., MAX410 op-amp) for high-impedance source signals.
규정 준수 정보
Lead-free finish indicated by '+' suffix per Maxim/ADI part numbering convention. Commercial temperature grade (0 C to +70 C); not AEC-Q100 qualified - choose MAX1156/MAX1157 family for automotive designs.
