MAX150AEPP+ - 8-Bit 1.34µs Half-Flash ADC with Reference | Maxim
MPN: MAX150AEPP+ ✓ פעילMAX150AEPP+ סקירה
What is an ADC? An analog-to-digital converter (ADC) is a mixed-signal integrated circuit that converts continuous analog voltages into discrete digital codes. Half-flash (also called subranging flash) ADCs split the conversion into two flash passes - a coarse pass that resolves the most significant bits and a fine pass that resolves the least significant bits - delivering flash-class speed at a fraction of the silicon area and power. ADCs sit within the broader hierarchy of data converters (ADC/DAC) -> mixed-signal ICs -> integrated circuits -> semiconductors.
Key features of the MAX150AEPP+ include an integrated 2.5V precision bandgap reference, an on-chip track-and-hold capable of capturing input signals with slew rates up to , and a microprocessor-compatible parallel interface with read/write control lines. The device draws a typical mA from the +5V rail and offers three-state output latches for direct bus connection.
Architecturally, the converter uses two 4-bit flash stages plus a DAC-based error subtractor to deliver 8-bit resolution in a single 1.34 µs conversion cycle. The integrated track-and-hold eliminates the need for an external sample-and-hold amplifier in most measurement scenarios. The internal reference is trimmed to ± % accuracy and can be bypassed or used to drive external circuitry.
Typical applications include data acquisition front ends, digital panel meters, process-control analog input boards, and audio digitizing where the 0-5V unipolar input matches common sensor and transducer output ranges. The half-flash architecture makes this ADC especially attractive when designers need flash-class speed without the power and cost penalty of a true flash converter.
When designing with this part, ensure that the analog input source can drive the device's input capacitance within the acquisition window, and add a 100 nF decoupling capacitor close to the VDD pin. The CS and RD inputs allow direct connection to most 8-bit microcontrollers without external glue logic. For high-noise environments, place the MAX150AEPP+ away from switching converters and route analog and digital grounds in a star pattern back to the regulator.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
חלופות תחליף ישיר עבור MAX150AEPP+ — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם MAX150AEPP+ (אותו גורם צורה וטביעת רגל) — שונים ב Operating Temperature, Package, Mounting Type, Analog Supply Voltage, Conversion Time.
MX7820KCPP+
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
MAX150BEPP+
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
MAX150CEPP+
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
AD7574KNZ
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ADC0804LCN
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←MAX150AEPP+ דירוגים מרביים ומאפיינים חשמליים
| רזולוציה | 8 bit |
| Architecture | Half-Flash (subranging flash) |
| Conversion Time | 1.34 µs |
| Analog Input Range | 0 V to +5 V |
| מתח אספקה | +5 V single supply |
| Number of Channels | 1 |
| Input Configuration | Single-ended, unipolar |
| ממשק | Parallel (8-bit, microprocessor-compatible) |
| Internal Reference | Yes (2.5 V integrated bandgap) |
| Track-and-Hold | Yes (on-chip) |
| מארז | PDIP-20 (DIP-20 plastic) |
| טמפרטורת פעולה | 0 °C to +70 °C (commercial) |
| סוג הרכבה | Through-Hole |
| Screening Level | Commercial |
| סטטוס RoHS | Compliant |
תצורת פינים של MAX150AEPP+
| פין 1 | DB0 — Data bit 0 (LSB), three-state output |
| פין 2 | DB1 — Data bit 1, three-state output |
| פין 3 | DB2 — Data bit 2, three-state output |
| פין 4 | DB3 — Data bit 3, three-state output |
| פין 5 | DB4 — Data bit 4, three-state output |
| פין 6 | DB5 — Data bit 5, three-state output |
| פין 7 | DB6 — Data bit 6, three-state output |
| פין 8 | DB7 — Data bit 7 (MSB), three-state output |
| פין 9 | MODE — Mode select input (read/write/standalone) |
| פין 10 | GND — Ground (0 V reference) |
| פין 11 | WR — Write/convert start input (active low) |
| פין 12 | RD — Read output enable (active low) |
| פין 13 | CS — Chip select (active low) |
| פין 14 | INT — Interrupt / end-of-conversion output |
| פין 15 | NC — Not connected (per datasheet) |
| פין 16 | REF — Internal 2.5V reference / bypass node |
| פין 17 | AIN — Analog input, 0 to +5 V range |
| פין 18 | REFADJ — Reference adjust / trim input |
| פין 19 | AGND — Analog ground |
| פין 20 | VDD — +5 V analog supply |
יישומים טיפוסיים
MAX150AEPP+ מתאים עבור 6 יישוםs: Data Acquisition Front End, Digital Panel Meter, Process Control Input Board, Audio Bandwidth Digitizing, Industrial Test and Measurement, Legacy Microcontroller Interface Board.
Data Acquisition Front End
The MAX150AEPP+ suits cost-sensitive data acquisition front ends where 8-bit resolution is acceptable and 1.34 µs conversion time keeps sample rates above 500 kSPS. The 0-5V unipolar input range matches the output of most transducers, potentiometers, and ratiometric bridges without external signal conditioning. On-chip track-and-hold and a 2.5V internal reference eliminate two common external components, reducing BOM cost and board area in compact DAQ modules.
מומלץ
Digital Panel Meter
The MAX150AEPP+'s parallel 8-bit bus and simple CS/RD control lines interface directly to 8051-family microcontrollers that drive 3.5-digit or 4-digit LED/LCD displays in panel meters. Half-flash 1.34 µs conversion keeps display update latency below 50 ms even with multiplexed displays, while the integrated reference ensures ratiometric readings of bridge sensors. The commercial 0-70 °C operating range covers most indoor metering applications.
מומלץ
Process Control Input Board
Process control analog input boards use the MAX150AEPP+ to digitize 0-5V signals from thermocouple amplifiers, pressure transmitters, and 4-20 mA sense resistors terminated to ground. The half-flash architecture provides faster settling than SAR converters of the same generation, supporting closed-loop control loops scanning rates up to ~50 kHz per channel when multiplexed. The 20-pin PDIP through-hole package simplifies field-replacement in legacy PLC I/O modules.
מומלץ
Audio Bandwidth Digitizing
While 8-bit resolution limits audio fidelity, the MAX150AEPP+ can digitize voice-bandwidth signals (300 Hz to 3.4 kHz) for telephony, intercom, and simple tone-detection subsystems. The 1.34 µs conversion supports 8 kSPS voice sampling with comfortable margin, and the parallel output simplifies connection to DSP codecs. Pairing the device with an anti-aliasing RC filter ahead of the analog input produces acceptable speech-quality recordings.
מומלץ
Industrial Test and Measurement
Bench-top digital multimeters and instrumentation use the MAX150AEPP+ for the voltage measurement channel because its 8-bit resolution and 0-5V input match 3.5-digit DMM display resolution, while the half-flash architecture delivers fast autoranging. The on-chip reference and track-and-hold reduce calibration drift and eliminate external sample-and-hold amplifiers. Through-hole PDIP packaging suits hand-soldered prototypes and field service replacements.
מומלץ
Legacy Microcontroller Interface Board
The MAX150AEPP+ connects directly to 8051, 68HC11, Z80, and similar 8-bit microcontrollers via its parallel data bus and CS/RD control lines, eliminating external glue logic. The device is popular for retrocomputing, hobby projects, educational kits, and industrial retrofit boards where engineers need a simple ADC that drops into a legacy parallel port. The microprocessor-compatible timing ensures compatibility with widely-used wait-state generators.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור MAX150AEPP+ — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | MX7820KCPP+ | MAX150BEPP+ | MAX150CEPP+ | AD7574KNZ | ADC0804LCN |
|---|---|---|---|---|---|---|
| Package | PDIP-20 | PDIP-20 - same | PDIP-20 - same | PDIP-20 - same | PDIP-20 - same | PDIP-20 - same |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Analog Devices | Texas Instruments |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Architecture | Half-Flash | Half-Flash | Half-Flash | Half-Flash | SAR | SAR |
| Conversion Time | 1.34 µs | 1.34 µs | 1.34 µs | 1.34 µs | 15 µs (slower SAR) | 110 µs (slower SAR) |
| Input Range | 0 V to +5 V | 0 V to +5 V | 0 V to +5 V | 0 V to +5 V | 0 V to +5 V | 0 V to +5 V (differential inputs) |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single |
| Internal Reference | Yes (2.5 V) | Yes (2.5 V) | Yes (2.5 V) | Yes (2.5 V) | External required | External required |
| On-Chip Track-and-Hold | Yes | Yes | Yes | Yes | No (external required) | No |
מבדילים עיקריים
- Integrated track-and-hold eliminates external sample-and-hold amplifier (לעומתADC0804LCN)
- On-chip precision bandgap reference removes external reference BOM cost (לעומתAD7574KNZ)
- Half-flash architecture delivers flash-class speed at lower power (לעומתADC0804LCN (SAR))
- Three-grade linearity (A/B/C) lets designers trade INL for cost (לעומתMX7820 single-grade)
הערות תכנון
Estimated: The MAX150AEPP+ draws a typical 8 mA from the +5V supply, so a low-noise linear regulator such as a 7805 or LT1761 should be used rather than a switching converter that injects ripple into the analog section. Place a 100 nF ceramic decoupling capacitor within 5 mm of pin 20 (VDD) and a 10 µF tantalum bulk capacitor at the supply entry to the board. Tie AGND (pin 19) and DGND (pin 10) together at a single star point beneath the IC.
Route analog input traces (pin 17) away from digital outputs (pins 1-8) and use a ground guard trace around the analog input to minimize digital coupling. The reference bypass pin (16) requires a 10 µF external capacitor to filter the internal bandgap reference; without this capacitor the reference noise degrades ADC performance. For PDIP packages, route signals on the solder side of the board only to keep the analog input trace short.
Do not drive the analog input from a high-impedance source - the track-and-hold acquisition requires the source to settle within ~400 ns, so a low-output-impedance op-amp buffer (such as the MAX4250 or OP07) should precede the ADC. Floating the MODE pin (9) leaves the device in an undefined state; tie MODE high or low according to the desired read/write/standalone mode. Ensure CS (pin 13) returns high between conversions or the three-state data bus stays active and contends with other devices.
Long PCB traces between the MAX150AEPP+ and a microcontroller create ringing on the parallel data bus that can corrupt conversion results. Keep the bus traces under 50 mm and add 33 Ω series resistors near the ADC outputs if ringing is observed on an oscilloscope. The INTR signal (pin 14) can be used as a busy/ready flag for interrupt-driven read schemes, reducing software timing overhead in tight polling loops.
מידע על תאימות
The '+' suffix indicates RoHS-compliant lead-free packaging. Not AEC-Q100 qualified; this part targets commercial/industrial panel meter and DAQ applications rather than automotive.
