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Analog Devices Inc. LTC2440CGN#PBF
- Part No.:
- LTC2440CGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC2440CGN#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,439
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Product details
Overview
LTC2440CGN#PBF from Analog Devices (formerly Linear Technology) is a 24-bit no-latency delta-sigma ADC with differential inputs, programmable speed/resolution (6.9 Hz to 3.5 kHz), 5 ppm INL, 5 µV offset, and integrated oscillator. It operates from 4.5 V to 5.5 V and delivers 200 nVRMS noise at 6.9 Hz with simultaneous 50/60 Hz rejection - ideal for high-precision weight scales and auto-ranging DVMs.
For engineers reviewing the LTC2440CGN#PBF datasheet, LTC2440CGN#PBF pinout, LTC2440CGN#PBF application, or LTC2440CGN#PBF equivalent, key selection criteria include its selectable output rates, differential reference support (0.1 V to VCC), autosleep current as low as 25 µA, pin compatibility with LTC2410, and guaranteed 24-bit no-missing-codes performance across temperature.
Technical Context
The LTC2440CGN#PBF uses a proprietary delta-sigma architecture enabling real-time speed/resolution reconfiguration without latency or settling delay. Its internal oscillator eliminates external timing components, and continuous per-conversion offset/full-scale calibration ensures stability over temperature, supply voltage, and time.
It supports both internal and external SCK modes via the EXT pin, offers 32-bit serial output (3 status + 24 data + 5 sub-LSB bits), and features four dedicated ground pins (Pins 1, 8, 9, 16) for optimal noise immunity and decoupling in high-resolution measurement systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - guarantees monotonicity and full dynamic range utilization in precision metrology. |
| INL | ±5 ppm of VREF - enables 0.0005% linearity accuracy critical for 6½-digit DVMs and calibration-grade instruments. |
| Offset Error | ≤5 µV (–40°C to 85°C) - ensures stable zero-point accuracy without periodic recalibration in industrial sensors. |
| Noise (RMS) | 200 nV at 6.9 Hz with 50/60 Hz rejection - allows direct AC-line-immune measurements in noisy factory environments. |
| Output Rate Range | 6.9 Hz to 3.5 kHz - supports flexible trade-offs between resolution (200 nV) and throughput (25 µV) without hardware changes. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V logic rails and tolerant of typical industrial power rail variation. |
| Reference Range | 0.1 V to VCC differential - permits use of low-voltage references to improve INL while maintaining full 24-bit code coverage. |
Pinout & Package
Narrow 16-lead SSOP (GN package), RoHS-compliant, 0°C to 70°C operating range. Four GND pins (1, 8, 9, 16) provide low-impedance return paths for analog and digital currents.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 8, 9, 16) | Ground reference | All four pins must be connected to PCB ground plane; internal connection optimizes decoupling and reduces ground bounce in high-resolution conversions. |
| VCC (2) | Positive supply | Requires local bypassing with 10 µF tantalum || 0.1 µF ceramic; powers analog core, digital interface, and internal oscillator. |
| REF+ / REF– (3, 4) | Differential reference input | Accepts 0.1 V to VCC differential span; common-mode range extends from GND to VCC, enabling ratiometric or isolated reference designs. |
| IN+ / IN– (5, 6) | Differential analog input | Bipolar input range = ±0.5 × VREF; absolute voltage range = GND – 0.3 V to VCC + 0.3 V - supports wide common-mode signal conditioning. |
| SDI (7) | Speed/resolution select | Logic LOW = 880 Hz / 2 µVRMS; HIGH = 6.9 Hz / 200 nVRMS + 50/60 Hz rejection; also accepts serial programming for 10 discrete modes. |
| EXT (10) | SCK mode control | LOW = external clock on SCK pin; HIGH = internal SCK generated and output on SCK pin - simplifies interface to microcontrollers or FPGAs. |
| CS (11) | Chip select | Active LOW enables SDO and wakes ADC from sleep; rising edge during data transfer aborts output and starts new conversion. |
| SDO (12) | Serial data output | 3-state output; carries 32-bit frame (status + 24-bit result + 5 sub-LSBs); high-Z when CS = HIGH to prevent bus contention. |
| SCK (13) | Serial clock | Bidirectional: input in external mode, output in internal mode; timing defined by EXT pin state and internal oscillator or external source. |
| fO (14) | Oscillator control | Tie to GND or VCC to enable internal oscillator; no external crystal required - reduces BOM count and layout complexity. |
| BUSY (15) | Conversion status | Active HIGH during conversion; goes LOW when result is ready and remains LOW during sleep/data output - pin-compatible with LTC2410 for drop-in upgrades. |
Key Features
| Feature | Design Value |
|---|---|
| No latency conversion | Each output corresponds exactly to the immediately preceding conversion - enables true real-time multiplexed acquisition without filter delay or phase shift. |
| Per-conversion auto-calibration | Continuous offset and full-scale correction eliminates drift-related errors over temperature, time, and supply variation - no user intervention required. |
| Autosleep power management | Draws only 25 µA at 6.9 Hz output rate - reduces average system power in battery-operated DVMs and portable instrumentation. |
| Differential reference & input | Supports fully differential signal chains with common-mode rejection >120 dB DC - rejects noise coupled equally to IN+/IN– or REF+/REF–. |
| Pin compatibility with LTC2410 | Same pinout, interface timing, and registerless operation - allows field-upgrade of existing designs without PCB revision. |
Applications
| Weight Scales | Auto-Ranging 6-Digit DVMs |
|---|---|
Use Scenario: High-accuracy load cell readout in commercial and industrial weighing systems requiring NTEP or OIML certification. IC Role / Device Role / Timing Role: Primary 24-bit ADC capturing bridge sensor outputs with 200 nVRMS noise floor and 50/60 Hz line rejection to suppress ambient EMI. Use Value: Enables 1:1,000,000 resolution (1 ppm) with guaranteed monotonicity and no missing codes - meets Class III/III L metrology requirements. | Use Scenario: Benchtop digital multimeter with automatic range switching and sub-µV sensitivity on DC voltage measurements. IC Role / Device Role / Timing Role: Core measurement engine delivering 24-bit results at up to 3.5 kHz for fast auto-ranging, with programmable speed to optimize noise vs. update rate. Use Value: Eliminates need for external averaging or oversampling firmware; 5 µV offset and 5 ppm INL support true 6½-digit accuracy without calibration drift. |
| Direct Temperature Measurement | High-Speed Data Acquisition |
Use Scenario: Precision RTD or thermocouple front-end in process control transmitters where long-term stability is critical. IC Role / Device Role / Timing Role: ADC with differential reference and input accepting low-level sensor signals; internal calibration maintains accuracy across –40°C to 85°C. Use Value: 20 nV/°C offset drift and <0.2 ppm/°C full-scale drift ensure <0.01°C error stability over industrial temperature ranges without recalibration. | Use Scenario: Multiplexed sensor array acquisition in test equipment requiring synchronized, low-latency sampling of multiple channels. IC Role / Device Role / Timing Role: High-speed delta-sigma ADC supporting seamless speed/resolution changes between conversions - no settling delay or invalid samples. Use Value: Enables true time-interleaved sampling across 4–8 channels using single LTC2440CGN#PBF and external analog mux - reduces system cost and board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2410CGN#PBF | Fixed 880 Hz output rate, 2 µVRMS noise, no SDI-programmable modes; identical pinout and interface. | Limited to medium-speed, medium-noise applications; lacks 6.9 Hz ultralow-noise mode with 50/60 Hz rejection. | Select when fixed-speed operation suffices and lowest BOM cost is prioritized over flexibility. |
| ADS1256IPW | 24-bit delta-sigma ADC with 30 kSPS max, integrated PGA, but requires external reference and clock; different pinout and SPI protocol. | Requires external oscillator and reference design; lacks built-in 50/60 Hz rejection and autosleep optimization. | Select when higher throughput (>1 kHz) or programmable gain is needed, and board space allows added components. |
Compared with LTC2410CGN#PBF, the LTC2440CGN#PBF adds programmable speed/resolution and 50/60 Hz rejection without layout change; compared with ADS1256IPW, it integrates oscillator and reference flexibility but trades off maximum sample rate and PGA functionality.
Availability
LTC2440CGN#PBF is available at Aetrix Electronics and suitable for weight scales, auto-ranging 6-digit DVMs, direct temperature measurement systems, and high-speed data acquisition requiring stable component supply and long-term production continuity.
Supply support for LTC2440CGN#PBF 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
Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2440CGN#PBF belongs to Linear's precision delta-sigma ADC product line, designed specifically for metrology-grade applications demanding ultra-low noise, high linearity, and zero-latency conversion in compact industrial and test equipment.
FAQ
What is the operating temperature range for the LTC2440CGN#PBF?
The LTC2440CGN#PBF is specified for 0°C to 70°C operation (Commercial grade). Its electrical characteristics - including 5 µV offset, 5 ppm INL, and 200 nVRMS noise at 6.9 Hz - are guaranteed across this full range. For extended temperature operation, the LTC2440IGN#PBF variant supports –40°C to 85°C.
Does the LTC2440CGN#PBF require an external crystal or oscillator?
No, the LTC2440CGN#PBF includes a fully integrated oscillator. The fO pin is used to enable it (tie to GND or VCC), eliminating all external timing components. This reduces bill-of-materials cost, PCB area, and layout sensitivity - a key advantage over alternatives like the ADS1256IPW that require external clocks.
How does the LTC2440CGN#PBF achieve 50/60 Hz rejection at 6.9 Hz output rate?
The LTC2440CGN#PBF achieves simultaneous 50/60 Hz rejection through its proprietary delta-sigma architecture and precise internal clocking. At the 6.9 Hz output rate (OSR = 32768), the modulator and decimation filter are inherently synchronized to reject both 50 Hz and 60 Hz line frequencies - no external notch filters or software averaging required. This is confirmed in the datasheet's TA01 and G24 figures.
Can the LTC2440CGN#PBF interface directly with a microcontroller SPI port?
Yes, the LTC2440CGN#PBF supports standard 3-wire or 4-wire SPI-compatible serial communication. When EXT = HIGH, it outputs SCK internally and uses BUSY as a data-ready indicator; when EXT = LOW, it accepts external SCK - making it compatible with most MCU SPI peripherals in either mode without protocol translation.
What is the meaning of the 32-bit output format of the LTC2440CGN#PBF?
The LTC2440CGN#PBF outputs a 32-bit serial frame: Bits 31–29 are status (EOC, dummy, sign), Bits 28–5 are the 24-bit conversion result (MSB first), and Bits 4–0 are sub-LSBs usable for averaging. This structure enables immediate interpretation of sign, over/underrange, and full resolution - with Bit 31 (EOC) available even during conversion when CS is LOW.
LTC2440CGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 3.5k
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2440CGN#PBF FAQ
1.How can I place an order for LTC2440CGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2440CGN#PBF 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 LTC2440CGN#PBF reliable?
The price and inventory of LTC2440CGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2440CGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC2440CGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2440CGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2440CGN#PBF?
LTC2440CGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2440CGN#PBF 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 LTC2440CGN#PBF?
For technical support, including LTC2440CGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2440CGN#PBF requirements.
6.How does Aetrix verify that LTC2440CGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2440CGN#PBF 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 LTC2440CGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC2440CGN#PBF?
All LTC2440CGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2440CGN#PBF, 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 LTC2440CGN#PBF part is unused and in its original packaging.
Return procedure for LTC2440CGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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