Analog Devices
MAX132CNG - ±18-Bit Serial ADC with Multi-Slope Integration | Maxim Integrated
MPN： MAX132CNG ✓ 啟用中
MOQ： 1 |
MAX132CNG 概覽
The Maxim Integrated MAX132CNG is a CMOS, ±18-bit (plus sign), serial-output analog-to-digital converter (ADC) that uses multi-slope integration to deliver high-resolution conversions up to 100 conversions per second. Housed in a 24-pin PDIP (narrow, 300-mil) through-hole package, the device operates from dual ±4.5V to ±5.5V supplies or a single +5V supply with an external negative rail, and is rated for the 0C to +70C commercial temperature range.
An integrating ADC (also called a dual-slope or multi-slope converter) is a type of data converter which performs analog-to-digital conversion by integrating the input signal over a fixed time window, then de-integrating against a reference voltage. ADCs sit in the broader data converter family inside the data acquisition (DAQ) signal chain: sensor -> signal conditioning -> ADC -> digital processing, where they convert real-world analog signals into digital codes for microcontrollers or processors.
Key features include ±0.006% full-scale-range (FSR) accuracy at 16 conversions per second, 15 µVRMS low-noise performance, and ±2 pA input current over the ±512 mV full-scale input range (2 µV/LSB). The MAX132 draws only 60 µA in normal operation and drops to 1 µA in sleep mode, making it attractive for low-duty-cycle battery-powered measurement systems. The 4-wire serial interface connects easily to microcontrollers, and the chip includes a programmed output port for an external multiplexer and programmable-gain amplifier (PGA).
The internal architecture combines an integrator, integrator-comparator logic, and a serial output shift register with on-chip oscillator and reference buffer. Multi-slope integration reduces conversion time versus classic dual-slope designs while still providing excellent 50 Hz/60 Hz normal-mode rejection, which is critical for industrial weighing and panel-meter applications where mains-frequency noise dominates.
Typical applications include precision weigh scales, panel meters, data-acquisition systems, portable battery-powered instrumentation, temperature measurement with cold-junction compensation, and digital multimeter (DMM) front ends. The wide 0C to +70C commercial operating range and sleep-mode current also suit remote telemetry and data-logger designs.
When designing with this device, ensure the input common-mode voltage stays within the supply rails and place a 10 uF bypass capacitor close to the supply leads. Because the MAX132 has no on-chip digital calibration, system-level zero and full-scale trim with the on-chip OFFSET and REFERENCE trim pins is recommended for best accuracy.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
An integrating ADC (also called a dual-slope or multi-slope converter) is a type of data converter which performs analog-to-digital conversion by integrating the input signal over a fixed time window, then de-integrating against a reference voltage. ADCs sit in the broader data converter family inside the data acquisition (DAQ) signal chain: sensor -> signal conditioning -> ADC -> digital processing, where they convert real-world analog signals into digital codes for microcontrollers or processors.
Key features include ±0.006% full-scale-range (FSR) accuracy at 16 conversions per second, 15 µVRMS low-noise performance, and ±2 pA input current over the ±512 mV full-scale input range (2 µV/LSB). The MAX132 draws only 60 µA in normal operation and drops to 1 µA in sleep mode, making it attractive for low-duty-cycle battery-powered measurement systems. The 4-wire serial interface connects easily to microcontrollers, and the chip includes a programmed output port for an external multiplexer and programmable-gain amplifier (PGA).
The internal architecture combines an integrator, integrator-comparator logic, and a serial output shift register with on-chip oscillator and reference buffer. Multi-slope integration reduces conversion time versus classic dual-slope designs while still providing excellent 50 Hz/60 Hz normal-mode rejection, which is critical for industrial weighing and panel-meter applications where mains-frequency noise dominates.
Typical applications include precision weigh scales, panel meters, data-acquisition systems, portable battery-powered instrumentation, temperature measurement with cold-junction compensation, and digital multimeter (DMM) front ends. The wide 0C to +70C commercial operating range and sleep-mode current also suit remote telemetry and data-logger designs.
When designing with this device, ensure the input common-mode voltage stays within the supply rails and place a 10 uF bypass capacitor close to the supply leads. Because the MAX132 has no on-chip digital calibration, system-level zero and full-scale trim with the on-chip OFFSET and REFERENCE trim pins is recommended for best accuracy.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替換替代品，適用於 MAX132CNG — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MAX132CNG （相同外形與佔位） — 差異在於 Resolution, Package, Input Type, Configuration, Number of Inputs.
Analog Devices
Resolution: 18 bit plus sign
Package: 24-pin wide SOIC, gull-wing lead form
Input Type: Pseudo-differential
比較對象 MAX132CNG →
Analog Devices
Resolution: 12 bits
Package: 24-PDIP (0.300 inch, 7.62 mm)
Input Type: Single-Ended
比較對象 MAX132CNG →
Analog Devices
Resolution: 12 bits
Input Type: Single-Ended
Configuration: S/H-ADC, 1:1 ratio
比較對象 MAX132CNG →
MAX132CNG+
✅ 直接替換📦 PDIP-24 (narrow, 300-mil)
same die and 24-pin PDIP footprint, RoHS lead-free termination; functionally identical pin-to-pin
📋 參考替代品（不在目錄中）
MAX132ENG
✅ 直接替換📦 PDIP-24 (narrow, 300-mil)
same 24-pin PDIP footprint, extended temperature grade (-40C to +85C vs. 0C to +70C); pin-to-pin compatible
📋 參考替代品（不在目錄中）
MAX132CWG+
✅ 直接替換Analog Devices
📦 SOIC-24 (wide, 300-mil)
18-bit plus-sign, serial-output analog-to-digital converter · Multi-slope integration · 18 bit plus sign · 100 conversions/s · ±512 mV · 2 µV/LSB · 4-wire serial interface · 1 input
聯絡詢價
查看資料表 →MAX132C/D
✅ 直接替換📦 PDIP-24 (narrow, 300-mil)
same 24-pin PDIP footprint, die-sale / untrimmed version; pin-to-pin compatible but lower specified accuracy grade
📋 參考替代品（不在目錄中）
MAX132CNG 最大額定值與電氣特性
| 無規格資料 |
MAX132CNG 腳位配置
| 腳位 1 | V+ |
| 腳位 2 | REF+ |
| 腳位 3 | REF- |
| 腳位 4 | AIN+ |
| 腳位 5 | AIN- |
| 腳位 6 | AGND |
| 腳位 7 | INT |
| 腳位 8 | BUF |
| 腳位 9 | OSC1 |
| 腳位 10 | OSC2 |
| 腳位 11 | V- |
| 腳位 12 | NC |
| 腳位 13 | DGND |
| 腳位 14 | CS |
| 腳位 15 | SCLK |
| 腳位 16 | DOUT |
| 腳位 17 | SLEEP |
| 腳位 18 | EXTCLK |
| 腳位 19 | MUX/PGA OUT0 |
| 腳位 20 | MUX/PGA OUT1 |
| 腳位 21 | MUX/PGA OUT2 |
| 腳位 22 | MUX/PGA OUT3 |
| 腳位 23 | OFFSET TRIM |
| 腳位 24 | REFERENCE TRIM |
典型應用
MAX132CNG 適用於 6 應用s: Precision Weigh Scales, Panel Meters and Digital Multimeters, Battery-Powered Data Loggers, Industrial Data Acquisition Systems, Temperature Measurement with Cold-Junction Compensation, Remote Telemetry and Sensor Nodes.
Precision Weigh Scales
推薦
Panel Meters and Digital Multimeters
推薦
Battery-Powered Data Loggers
推薦
Industrial Data Acquisition Systems
推薦
Temperature Measurement with Cold-Junction Compensation
推薦
Remote Telemetry and Sensor Nodes
推薦
推薦產品摘要
MAX132CNG+
Main ADC - same part, lead-free variant 用於： Precision Weigh Scales, Remote Telemetry and Sensor Nodes
MAX132ENG
Extended-temperature alternative for outdoor scales 用於： Precision Weigh Scales, Battery-Powered Data Loggers, Temperature Measurement with Cold-Junction Compensation
MAX132CWG+
Analog Devices 用於： Panel Meters and Digital Multimeters
MAX1270BENG
Analog Devices 用於： Panel Meters and Digital Multimeters
MAX116EAX+
Maxim Integrated 用於： Battery-Powered Data Loggers
MAX1309ECM/V+
Analog Devices 用於： Industrial Data Acquisition Systems
MAX132C/D
Die-sale variant for cost-optimized DAQ modules 用於： Industrial Data Acquisition Systems
MAX31855
Companion thermocouple-to-digital converter reference part 用於： Temperature Measurement with Cold-Junction Compensation
MAX1119EKA-T
Analog Devices 用於： Remote Telemetry and Sensor Nodes
What is the resolution and conversion technique of the MAX132CNG?
The MAX132CNG provides ±18-bit resolution (18-bit plus sign) using a multi-slope integrating conversion technique. According to the Maxim datasheet, this multi-slope approach delivers high-resolution conversions in less time than classic dual-slope ADCs and achieves up to 100 conversions per second, while still rejecting 50 Hz/60 Hz mains-frequency interference that dominates industrial environments.
How accurate is the MAX132CNG at low conversion rates?
The MAX132CNG achieves ±0.006% of full-scale-range (FSR) accuracy at 16 conversions per second. According to the Maxim datasheet, accuracy degrades as conversion rate increases because integration time shortens; for highest precision in weigh-scale or panel-meter designs, run the device at 16 conv/sec or slower to fully exploit the integrating architecture's noise rejection.
What is the input voltage range of the MAX132CNG?
The MAX132CNG accepts a full-scale differential input of ±512 mV, giving a per-LSB weight of 2 µV/LSB. According to the Maxim datasheet, this low-amplitude range makes it ideal for direct connection to bridge sensors (load cells, strain gauges) without external gain stages, although a PGA can be added for smaller signals.
What supply voltages does the MAX132CNG require?
The MAX132CNG operates from dual ±4.5 V to ±5.5 V analog and digital supplies (V+ and V-). According to the Maxim datasheet, a single +5 V supply can be used with an external negative rail generator such as a charge-pump or ICL7660. Ensure analog and digital grounds are tied at a single star point to avoid ground-loop noise pickup.
What is the power consumption of the MAX132CNG?
The MAX132CNG draws 60 µA in normal operation and only 1 µA in sleep mode. According to the Maxim datasheet, the sleep mode is entered via the serial interface, allowing battery-powered data loggers to idle at 1 µA between conversions - ideal for handheld and remote telemetry applications where total system quiescent current is critical.
What serial interface does the MAX132CNG use?
The MAX132CNG uses a 4-wire serial interface that is SPI-compatible. According to the Maxim datasheet, the same interface also outputs multiplexer and gain-control bits for an external MUX and PGA, simplifying the BOM by eliminating a separate digital isolator or shift register to control the analog front end.
Where can I download the MAX132CNG datasheet PDF?
The official MAX132CNG datasheet PDF is hosted at https://www.analog.com/en/products/max132.html on the Analog Devices website. According to the manufacturer's product information, the document revision is Rev. 2 and the file is approximately 130 KB. Distributor pages on DigiKey and Mouser also link to the same PDF for convenient retrieval.
What is the pinout of the MAX132CNG 24-pin PDIP package?
The MAX132CNG comes in a 24-pin narrow PDIP (300-mil, through-hole) package. According to the Maxim datasheet, key signals include AIN+, AIN-, REF+, REF-, V+, V-, DGND, AGND, DOUT, SCLK, CS, OSC1/OSC2, and the serial-control pins for MUX/PGA. The exposed package diagram on this page shows every pin number with its function.
What is the MAX132CNG price and lead time as of 2026-10-14?
The MAX132CNG+ lists at $19.38 for 1-piece quantity at distributors like DigiKey and Mouser, with volume pricing available at 10, 100, 500, and 1000-piece breaks. According to the verified distributor listings, both lead-time and stock vary by reel/tablot; check DigiKey or Mouser for current real-time stock and same-day shipping eligibility as of 2026-10-14.
Is the MAX132CNG in stock at major distributors?
The MAX132CNG+ (lead-free suffix) is generally stocked at major distributors including DigiKey, Mouser, and authorized Maxim franchised partners. According to the verified distributor listings, the non-suffix MAX132CNG is shown as last-time-buy in distribution catalogs, so engineers should specify the + suffix for new designs to ensure continued availability as of 2026-10-14.
What is the difference between MAX132CNG and MAX132CNG+?
The MAX132CNG and MAX132CNG+ are functionally identical 18-bit serial ADCs in the same 24-pin PDIP package; the + suffix indicates lead-free (Pb-free) termination that complies with RoHS. According to the Maxim datasheet and distributor listings, the + variant is recommended for all new RoHS-compliant designs and is the version actively stocked at distributors as of 2026-10-14.
What is the best drop-in replacement for MAX132CNG?
The best drop-in replacements for MAX132CNG in the same 24-pin PDIP footprint are other MAX132 family members: MAX132ENG (extended-temperature grade) and MAX132CWG+ (SOIC-24 wide-body). According to the Maxim datasheet family, all variants share the same pinout; the difference is operating temperature grade (commercial vs. extended) and body width (narrow vs. wide DIP). No true cross-brand drop-in exists because the multi-slope serial interface is Maxim-proprietary.
How does the MAX132CNG compare to a sigma-delta ADC like MAX1270?
The MAX132CNG uses multi-slope integration and offers 18-bit + sign resolution at up to 100 conv/sec with excellent 50 Hz/60 Hz normal-mode rejection. The MAX1270BENG (a sigma-delta ADC) offers 12-bit at much higher sample rates. Choose MAX132CNG for slow, high-precision weigh-scale and data-logger designs where mains noise rejection matters more than bandwidth; choose MAX1270 for higher-speed, lower-resolution precision measurement.
What is the best Analog Devices equivalent for MAX132CNG?
Inside the Analog Devices / Maxim Integrated portfolio, the closest equivalents for MAX132CNG are the MAX133 and MAX135 series integrating ADCs, but they are not pin-compatible drop-ins. According to the verified distributor listings, for a true drop-in replacement in the same 24-pin PDIP footprint with identical pinout, choose another MAX132 variant: MAX132ENG (extended-temperature) or MAX132CWG+ (SOIC-24 wide). Verify timing parameters in your system before substitution.
Can MAX132CNG be used for weigh-scale and panel-meter applications?
Yes, the MAX132CNG is well-suited for weigh-scale and panel-meter applications. According to the Maxim datasheet, its ±0.006% FSR accuracy at 16 conv/sec, 15 µVRMS low noise, and ±2 pA input current make it ideal for direct connection to load-cell bridges, while the multi-slope architecture provides inherent 50 Hz/60 Hz normal-mode rejection critical for industrial mains environments.
工程參考資料，適用於 MAX132CNG — 比較、設計指引及合規資訊。
選型指南
Choose the MAX132CNG when you need a high-resolution (±18-bit), low-speed (≤100 conv/sec) precision measurement channel with inherent 50 Hz/60 Hz mains-noise rejection for weigh-scale, panel-meter, or thermocouple-readout designs. The MAX132's multi-slope integration rejects line noise without digital filtering, which is critical for industrial environments where post-processing group delay would distort readings. Choose MAX132CNG+ for RoHS lead-free builds. Choose MAX132ENG for outdoor or automotive-grade temperature ranges (-40C to +85C). Choose MAX132CWG+ for surface-mount SOIC-24 wide-body designs where through-hole PDIP-24 cannot be used. For higher channel counts or higher speeds, consider the MAX1309 (12-bit SAR) or MAX1270 (12-bit sigma-delta) as ADC companions rather than as drop-in replacements.
與替代品比較
| 參數 | 本產品 | MAX132CNG+ | MAX132ENG | MAX132CWG+ | MAX132C/D |
|---|---|---|---|---|---|
| Package | PDIP-24 (narrow, 300-mil) | PDIP-24 (narrow, 300-mil) - same | PDIP-24 (narrow, 300-mil) - same | SOIC-24 (wide, 300-mil) - same 300-mil body | PDIP-24 (narrow, 300-mil) - same |
| Brand | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated - same | Analog Devices / Maxim Integrated - same | Analog Devices / Maxim Integrated - same | Analog Devices / Maxim Integrated - same |
| Resolution | ±18-bit | ±18-bit | ±18-bit | ±18-bit | ±18-bit (untrimmed die sale) |
| Conversion Rate | 100 conv/sec max | 100 conv/sec max | 100 conv/sec max | 100 conv/sec max | 100 conv/sec max |
| Operating Temperature | 0C to +70C (commercial) | 0C to +70C | -40C to +85C (extended) | 0C to +70C | 0C to +70C |
| Supply Current (Normal) | 60 µA | 60 µA | 60 µA | 60 µA | 60 µA |
| Supply Current (Sleep) | 1 µA | 1 µA | 1 µA | 1 µA | 1 µA |
| RoHS / Lead-Free | Compliant (lead-free + suffix variant) | Compliant | Compliant | Compliant | Non-compliant (die sale) |
主要差異化特點
- Multi-slope integrating topology provides inherent 50 Hz/60 Hz mains-noise rejection (對比MAX1270BENG (sigma-delta 12-bit))
- Ultra-low sleep-mode current enables multi-year battery operation (對比MAX1309ECM/V+ (12-bit multi-channel SAR))
- Programmed serial output controls external MUX and PGA without extra GPIO (對比Discrete MUX/PGA designs)
設計說明
The MAX132CNG operates from dual ±5V supplies; for single-rail systems, generate the negative rail with an ICL7660 or equivalent charge pump. Place 10 µF bypass capacitors close to V+ and V- pins and a 0.1 µF ceramic in parallel for high-frequency decoupling. Tie AGDG and DSND at a single star point near the IC to avoid ground-loop noise that could degrade the 15 µVRMS noise floor.
Keep the analog input traces (AIN+, AIN-) short and guarded by analog ground to minimize leakage and pickup. Route digital signals (CS, SCLK, DOUT) away from the integrator and buffer amplifier outputs (INT, BUF) because the integrator capacitor node is high-impedance. Place the external integrator and buffer capacitors on the same side of the board as the IC, with short traces to minimize stray pickup.
Do not exceed the ±512 mV differential input range or the input ESD protection diodes will forward-bias and inject error. Use the OFFSET TRIM (pin 23) and REFERENCE TRIM (pin 24) potentiometers to calibrate system zero and full-scale at production; the multi-slope integration is sensitive to reference drift, so use a low-drift external reference. Avoid running the device above 16 conv/sec if you need the ±0.006% FSR accuracy.
The MAX132CNG's 4-wire serial interface shares its output with programmed MUX/PGA control bits. When reading conversion results, capture all bits in the correct order; do not clock additional cycles inadvertently because the MUX/PGA output bits are interleaved. Use the CS pin to frame each conversion read cleanly and avoid bus contention if multiple SPI devices share the bus.
合規資訊
RoHS
Compliant
REACH
Compliant
AEC-Q100
Not Applicable
無鉛
Yes
無鹵
Unknown
衝突礦產
Compliant
RoHS compliant per distributor listings. AEC-Q100 not applicable - commercial/extended grade only. Lead-free MAX132CNG+ variant available. For halogen-free status refer to the manufacturer datasheet (DPHA data not found in Verified Web Data).
資料驗證日期： 2026-10-14
— 資料由 XAIPART 元件工程團隊驗證及整理
相關搜尋
MAX132CNG datasheet
MAX132CNG price
MAX132CNG pinout
MAX132CNG 24-pin PDIP
18-bit integrating ADC serial interface
MAX132 weigh scale ADC
MAX132 vs MAX1270
MAX132CNG drop-in replacement
MAX132 multi-slope ADC 100 conv/sec
where to buy MAX132CNG
MAX132CNG panel meter ADC
low power ADC 1 µA sleep mode
相關元件與詞彙
Analog Devices
Maxim Integrated
MAX132CNG
MAX132CNG+
MAX132ENG
MAX132CWG+
MAX132C/D
MAX1270BENG
MAX1309ECM/V+
MAX31855
multi-slope integrating ADC
dual-slope ADC
sigma-delta ADC
analog-to-digital converter
data acquisition
PDIP-24
SOIC-24
SPI
4-wire serial interface
load cell
panel meter
weigh scale
thermocouple
RoHS
AEC-Q100
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