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Analog Devices Inc./Maxim Integrated MAX1450CAP
- Part No.:
- MAX1450CAP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Sensor and Detector Interfaces
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1450CAP.pdf
- Description:
- SIGNAL CONDITIONER FOR SENSOR
- Quantity:
- Payment:
- Shipping:
Inventory:631
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Product details
Overview
MAX1450CAP from Maxim Integrated is a fully analog, 3-bit programmable-gain instrumentation amplifier optimized for piezoresistive sensor signal conditioning and temperature compensation. It delivers 1% total error factor relative to sensor repeatability, supports 39–221 V/V PGA gain, features rail-to-rail output swing (VSS + 0.05V to VDD – 0.05V), and operates from 4.5V to 5.5V supply across 0°C to +70°C - enabling low-cost pressure transducer calibration in automotive MAP and industrial hydraulic systems.
For engineers reviewing the MAX1450CAP datasheet, MAX1450CAP pinout, MAX1450CAP application, or MAX1450CAP equivalent, key selection considerations include its external-trim-based 5-term compensation (offset, FSO, offset TC, FSO TC, FSO nonlinearity), 20-pin SSOP package, 1MΩ input impedance, <1ms settling time, and compatibility with 10–30 mV/V sensor sensitivities.
Technical Context
The MAX1450CAP implements a three-stage analog signal path: a high-CMRR (90dB) 3-bit PGA with eight discrete gains (39–221 V/V), a summing junction for analog coefficient injection (OFFSET, OFFTC, SOFF, SOTC), and a unity-gain output buffer capable of ±1mA drive. Its bridge excitation current source delivers 0.1–2.0mA via BDRIVE with 13μA/μA gain control through ISRC and FSOTRIM.
Compensation is performed entirely externally using trimmable resistors, potentiometers, or DACs - no digital interface or internal memory. The device requires simultaneous thermal tracking between sensor and IC (Note 3), and all coefficients are applied as analog voltage sums at dedicated pins (OFFSET, OFFTC, BBUF) with polarity controlled by logic inputs (SOFF, SOTC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - ensures stable operation with standard 5V systems and tolerates ±5% rail variation. |
| PGA Gain Range | 39V/V to 221V/V in 8 discrete steps - matches typical piezoresistive sensor outputs (10–30mV/V) to achieve 4V full-scale output with 2.5V bridge drive. |
| Input Impedance | 1.0MΩ - minimizes loading on high-impedance sensor bridges without requiring external buffering. |
| Output Settling Time | <1ms to 63% - enables rapid calibration sweeps across pressure/temperature test points. |
| Rail-to-Rail Output Swing | VSS + 0.05V / VDD – 0.05V (no load) - maximizes dynamic range for ADC interfacing in ratiometric systems. |
| Bridge Drive Current | 0.1mA to 2.0mA - configurable via FSOTRIM and RISRC to match sensor impedance (e.g., 5kΩ at +25°C → ~0.5mA nominal). |
| CMRR | 90dB - rejects common-mode noise from long sensor traces in noisy industrial environments. |
Pinout & Package
MAX1450CAP is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm pitch, JEDEC MO-153 compliant, land pattern 09-0094, outline 21-0056.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INP / INM | Differential sensor input pair | Accepts 10–30mV/V bridge output with 1MΩ input impedance and rail-to-rail common-mode range (VSS to VDD). |
| A0 / A1 / A2 | PGA gain select inputs | Set discrete gain (39–221 V/V) via 3-bit binary code; internally pulled to VSS (1MΩ typ), logic-high = VDD connection. |
| OFFSET / OFFTC | Analog coefficient injection nodes | Summed into PGA output with ±100mV adjustable offset range and 1.15× scaling factor - enable analog trimming of sensor errors. |
| SOFF / SOTC | Offset/Offset TC sign control | Logic inputs that invert polarity of OFFSET/OFFTC contribution; internally pulled to VSS (1MΩ typ) - determine add/subtract behavior. |
| BDRIVE / ISRC / FSOTRIM | Bridge excitation current control | ISRC sets reference current; FSOTRIM adjusts nominal IISRC; BDRIVE delivers 0.1–2.0mA to sensor bridge with 13× current gain. |
| BBUF | Buffered bridge voltage output | Provides VBBUF (VSS + 1.3V to VDD – 1.3V) for feedback to RSTC to correct FSO temperature coefficient. |
| OUT | Conditioned analog output | Single-ended, rail-to-rail output (VSS + 0.05V to VDD – 0.05V, no load); requires 0.1μF bypass to VSS. |
| VDD / VSS | Power supply terminals | VDD accepts 4.5–5.5V; VSS is ground reference; both require 0.1μF local decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| 1% total error factor | Guarantees compensated output accuracy within 1% of sensor's inherent repeatability - eliminates need for microcontroller-based digital compensation in cost-sensitive applications. |
| 5-term analog compensation | Simultaneously corrects offset, full-span output (FSO), offset tempco, FSO tempco, and FSO nonlinearity using external resistors/DACs - avoids firmware development and EEPROM storage. |
| Rail-to-rail output buffer | Swings to within 50mV of rails with no load - maximizes ADC utilization in 5V ratiometric systems without level-shifting circuitry. |
| Fast 1ms settling | Enables complete pressure/temperature calibration cycle in under 100ms - critical for high-throughput production test environments. |
| Trimmable 10–30mV/V sensitivity support | Accommodates wide range of piezoresistive sensors (e.g., MAP, hydraulic, industrial pressure) without gain reconfiguration or external amplification. |
Applications
| Manifold Absolute Pressure (MAP) Sensors | Piezoresistive Pressure Transducers |
|---|---|
Use Scenario: Engine intake manifold pressure sensing in automotive powertrain control units under ambient temperatures from –40°C to +125°C. IC Role / Device Role / Timing Role: Signal conditioner that calibrates and temperature-compensates silicon piezoresistive bridge output to deliver ratiometric 0.5–4.5V output referenced to 5V supply. Use Value: Enables single-point calibration at room temperature while achieving ±1.5% FSO accuracy over full automotive temperature range - reducing calibration labor and test equipment cost. | Use Scenario: Industrial hydraulic system pressure monitoring where sensor drift must be suppressed below 1% FSO across 0°C to +70°C operating range. IC Role / Device Role / Timing Role: Analog front-end that applies external resistor-based correction for offset, FSO, and their temperature coefficients without digital intervention. Use Value: Eliminates need for microcontroller, ADC, and compensation algorithm - lowering BOM count and firmware validation burden in safety-critical embedded systems. |
| Hydraulic Systems | Industrial Pressure Sensors |
Use Scenario: Closed-loop pressure control in mobile hydraulic machinery exposed to vibration, EMI, and wide ambient temperature swings. IC Role / Device Role / Timing Role: High-CMRR (90dB) instrumentation amplifier that rejects common-mode noise from solenoid drivers and motor inverters while conditioning low-level bridge signals. Use Value: Maintains signal integrity without shielding or twisted-pair routing - simplifying harness design and reducing assembly cost in off-highway equipment. | Use Scenario: Factory-floor pressure monitoring for process control, where long-term stability and minimal recalibration are required. IC Role / Device Role / Timing Role: Trimmable analog compensator that stores calibration coefficients in passive components - immune to radiation-induced memory corruption or firmware corruption. Use Value: Ensures 15+ year operational reliability without software updates or field recalibration - meeting industrial lifecycle expectations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar piezoresistive sensor signal conditioning applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1452AAP | Wider temperature range (–40°C to +125°C), same 20-pin SSOP package, identical pinout and functional architecture - adds integrated EEPROM for coefficient storage. | Required for automotive under-hood or industrial high-temp deployments where MAX1450CAP's 0°C to +70°C rating is insufficient. | Select MAX1452AAP when EEPROM-based coefficient retention or extended temperature operation is mandatory; otherwise MAX1450CAP offers lower cost and simpler analog-only implementation. |
| AD8555ACPZ | Chopper-stabilized auto-zero amplifier with 20ppm/°C offset drift, 120dB CMRR, but no built-in bridge drive or multi-term compensation architecture - requires external current source and discrete trimming network. | Suitable for ultra-low-drift precision applications where sensor errors are dominated by offset drift rather than FSO tempco or nonlinearity. | Choose AD8555ACPZ only when sub-10μV/°C offset drift is critical and system can accommodate external bridge drive and custom trimming circuitry - MAX1450CAP provides integrated, purpose-built compensation. |
Compared with MAX1452AAP, MAX1450CAP trades EEPROM storage and extended temperature rating for lower unit cost and reduced design complexity; compared with AD8555ACPZ, it delivers turnkey 5-term compensation without external active components or layout-sensitive chopper routing - making it optimal for high-volume, cost-sensitive piezoresistive transducer manufacturing.
Availability
MAX1450CAP is available at Aetrix Electronics and suitable for automotive MAP sensors, industrial hydraulic pressure monitoring, factory-floor process control, and medium-accuracy piezoresistive transducer calibration requiring stable component supply and consistent parametric performance across production lots.
Supply support for MAX1450CAP 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) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications - with emphasis on high-reliability, low-power, and application-specific signal chains.
The MAX1450 product line targets piezoresistive sensor manufacturers needing low-cost, fully analog signal conditioners that eliminate digital calibration infrastructure while delivering 1% compensated accuracy - specifically for pressure, acceleration, and force sensing in cost-constrained systems.
FAQ
What is the operating temperature range specified for the MAX1450CAP?
The MAX1450CAP is rated for operation from 0°C to +70°C. This commercial-grade temperature range is explicitly defined in the ordering information table and absolute maximum ratings section of the datasheet. It differs from the MAX1450AAP (–40°C to +125°C) and MAX1450C/D dice versions. Thermal tracking between the MAX1450CAP and the connected piezoresistive sensor is mandatory per Note 3 in the Electrical Characteristics table.
Does the MAX1450CAP include internal memory for storing calibration coefficients?
No, the MAX1450CAP does not contain any internal memory such as EEPROM or flash. All compensation coefficients - for offset, FSO, offset TC, FSO TC, and FSO nonlinearity - are applied externally via analog voltages injected into pins OFFSET, OFFTC, and BBUF using trimmable resistors, potentiometers, or DACs. This analog-only architecture eliminates firmware dependencies and ensures immunity to memory corruption, distinguishing it from the pin-compatible MAX1452 series which integrates EEPROM.
Can the MAX1450CAP be used with sensors other than piezoresistive types?
Yes, the MAX1450CAP datasheet explicitly states it "may also be used with other resistive sensor types such as strain gauges." Its 1MΩ input impedance, 10–30mV/V sensitivity support, and fully differential input stage make it compatible with any Wheatstone bridge-based resistive sensor whose output falls within the specified input range and whose temperature error profile aligns with the five-term compensation model. However, optimization and published performance data (e.g., 1% error factor) are validated specifically for silicon piezoresistive sensors.
What is the function of the SOTC and SOFF pins on the MAX1450CAP?
The SOTC (Offset TC Sign Bit Input) and SOFF (Offset Sign Bit Input) pins control the polarity of analog correction voltages applied to the OFFTC and OFFSET pins, respectively. A logic low (connected to VSS or left floating) subtracts the corresponding voltage from the PGA output; connecting to VDD adds it. Both pins feature internal 1MΩ pull-down resistors, enabling default subtraction behavior without external components - allowing flexible sign selection during calibration without redesigning the PCB.
Is the MAX1450CAP pin-compatible with other variants in the MAX1450 family?
Yes, the MAX1450CAP is pin-compatible with the MAX1450AAP and MAX1450C/D dice versions - all share identical 20-pin SSOP pinout and functional assignment per the Pin Description table. This allows drop-in replacement between commercial (CAP) and automotive-grade (AAP) variants when thermal requirements change, provided board layout accommodates the different package footprints (SSOP vs. die). The MAX1452 series shares the same pinout but adds EEPROM-related pins (e.g., SCL/SDA), making it not pin-compatible.
MAX1450CAP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Signal Conditioner
- Input Type:
- Analog
- Output Type:
- -
- Current - Supply:
- 3.5 mA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
MAX1450CAP FAQ
1.How can I place an order for MAX1450CAP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1450CAP 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 MAX1450CAP reliable?
The price and inventory of MAX1450CAP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1450CAP is usually 5 days.
3.What payment methods are accepted for MAX1450CAP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1450CAP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1450CAP?
MAX1450CAP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1450CAP 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 MAX1450CAP?
For technical support, including MAX1450CAP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1450CAP requirements.
6.How does Aetrix verify that MAX1450CAP is sourced from the original manufacturer or authorized distributors?
All MAX1450CAP 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 MAX1450CAP meets industry standards.
7.What is the process for return or replacement of MAX1450CAP?
All MAX1450CAP units undergo pre-shipment inspection (PSI). If there is an issue with MAX1450CAP, 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 MAX1450CAP part is unused and in its original packaging.
Return procedure for MAX1450CAP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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