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Analog Devices Inc. LTC2435IGN#PBF
- Part No.:
- LTC2435IGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC2435IGN#PBF.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,659
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Product details
Overview
LTC2435IGN#PBF from Analog Devices (formerly Linear Technology) is a 20-bit micropower delta-sigma ADC with differential input and reference, single-cycle settling, 3ppm INL, 0.8ppm RMS noise, and internal oscillator-designed for high-precision sensor digitization in industrial instrumentation and weigh scales operating from 2.7V to 5.5V.
For engineers reviewing the LTC2435IGN#PBF datasheet, LTC2435IGN#PBF pinout, LTC2435IGN#PBF application, or LTC2435IGN#PBF equivalent, key selection criteria include its 50Hz/60Hz simultaneous line rejection (LTC2435-1 variant), GND-to-VCC common-mode input/reference flexibility, 200µA active / 4µA auto-sleep current, and SSOP-16 package compatibility with SO-8 footprints.
Technical Context
The LTC2435IGN#PBF implements a no-latency delta-sigma architecture with integrated decimating FIR filter and autocalibration DAC, enabling true single-conversion settling without pipeline delay. Its digital filter null is programmable via FO pin: grounded for 60Hz rejection (LTC2435) or simultaneous 50Hz/60Hz rejection (LTC2435-1), or driven externally for user-defined notch at fEOSC/2560.
It supports fully differential analog input (–0.5VREF to +0.5VREF) and reference (0.1V to VCC), with independent common-mode ranges for VINCM and VREFCM (both GND to VCC). DC common-mode rejection exceeds 120dB, and PSRR reaches 120dB at 50/60Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit with no missing codes-guarantees monotonicity and full-scale fidelity across temperature. |
| INL | 3ppm of VREF-enables 0.0003% full-scale accuracy critical for 6½-digit DVMs and precision strain gage systems. |
| RMS Noise | 0.8ppm of VREF (4µVRMS at 5V ref)-supports sub-microvolt signal resolution in low-drift transducer interfaces. |
| Input CMR | >120dB DC-rejects common-mode interference from shared ground paths in multi-sensor industrial nodes. |
| Supply Current | 200µA active, 4µA auto-sleep-extends battery life in portable instrumentation without sacrificing conversion integrity. |
| Reference Range | 0.1V to VCC-allows ratiometric sensing with low-voltage references or direct connection to supply rails. |
| Output Rate | 13.75Hz (LTC2435-1), 15Hz (LTC2435)-optimized for 50/60Hz line-synchronized measurements with zero latency. |
Pinout & Package
Package: 16-lead plastic SSOP (GN), 0.150" wide, SO-8 footprint-compatible, –40°C to +85°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,7,8,9,10,15,16) | Ground reference | Seven dedicated ground pins ensure low-impedance return paths for analog/digital currents and optimal VCC decoupling-must all be connected to PCB ground plane. |
| VCC (Pin 2) | Positive supply | 2.7V–5.5V single supply; requires 10µF tantalum + 0.1µF ceramic bypass to Pin 1 for stable operation. |
| REF+ / REF– (Pins 3,4) | Differential reference inputs | Accept any differential voltage 0.1V–VCC; common-mode range GND–VCC enables remote sensing and flexible ratiometric configurations. |
| IN+ / IN– (Pins 5,6) | Differential analog inputs | Support bipolar input range ±0.5VREF; absolute voltage range GND–0.3V to VCC+0.3V allows direct connection to transducer outputs. |
| CS (Pin 11) | Active-low chip select | Wakes ADC from sleep mode; LOW initiates data output; HIGH aborts transfer and starts new conversion. |
| SDO (Pin 12) | Three-state serial data output | Outputs 24-bit conversion result on falling SCK edge; Hi-Z when CS = HIGH-compatible with SPI/MICROWIRE buses. |
| SCK (Pin 13) | Bidirectional serial clock | Auto-configures as output (internal clock mode) or input (external clock mode) based on power-up state-no register programming required. |
| FO (Pin 14) | Frequency control | Selects notch frequency: GND = 60Hz (LTC2435) or 50/60Hz simultaneous (LTC2435-1); VCC = 50Hz (LTC2435); external clock = fEOSC/2560. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency delta-sigma conversion | Single-cycle settling eliminates multiplexing delay-each output corresponds exactly to one analog sample. |
| Simultaneous 50Hz/60Hz rejection | LTC2435-1 variant achieves >87dB normal-mode rejection across 49Hz–61.2Hz-ideal for global instrumentation deployed in mixed-grid regions. |
| Full-scale auto-calibration per cycle | Continuous internal calibration maintains <±10ppm gain drift over time/temperature-no external recalibration needed in field-deployed systems. |
| GND-to-VCC common-mode range | Independent VINCM and VREFCM ranges allow direct interface to bridge sensors, RTDs, and thermocouples without level-shifting circuitry. |
| Flexible 3-wire serial interface | Hardware-configurable SPI/MICROWIRE mode with no registers-reduces firmware overhead and eliminates configuration errors. |
Applications
| Weight Scales | Direct Temperature Measurement |
|---|---|
Use Scenario: High-resolution load cell readout in commercial and industrial weighing systems requiring NTEP/EC type approval. IC Role / Device Role / Timing Role: Direct digitizer for mV-level bridge outputs; provides 20-bit resolution with 0.8ppm noise floor and 3ppm INL for Class III/IV accuracy. Use Value: Eliminates external amplification and offset trimming-reduces BOM count and improves long-term stability under thermal cycling. | Use Scenario: Precision RTD or thermistor measurement in HVAC controllers and process temperature monitoring. IC Role / Device Role / Timing Role: Ratiometric ADC with programmable 50/60Hz rejection; accepts 2-, 3-, or 4-wire RTD configurations using external reference resistors. Use Value: Enables direct Kelvin sensing with <100nV/°C offset drift-supports ±0.01°C repeatability without cold-junction compensation hardware. |
| Gas Analyzers | Strain Gage Transducers |
Use Scenario: Low-power electrochemical gas sensor signal conditioning in portable air quality monitors. IC Role / Device Role / Timing Role: Micropower ADC with 4µA sleep current and 13.75Hz output rate-optimized for battery-operated, line-powered dual-mode instruments. Use Value: Delivers 20-bit resolution at 200µA active current-extends AA battery life beyond 1 year while maintaining ppm-level gas concentration accuracy. | Use Scenario: Structural health monitoring in civil engineering applications using bonded foil or MEMS strain gages. IC Role / Device Role / Timing Role: Differential input ADC with >120dB DC common-mode rejection-rejects ground-loop noise in long-cable installations. Use Value: Supports 10,000+ hour unattended operation with <0.001% full-scale drift-meets ASTM E1238 fatigue testing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPWR | 24-bit, 4kSPS, integrated PGA and sensor bias; no internal oscillator; requires external clock for line rejection. | Targets higher-speed multi-channel systems with programmable gain; lacks simultaneous 50/60Hz rejection. | Choose ADS124S08IPWR when system requires >1kHz sampling or on-chip PGA-LTC2435IGN#PBF preferred for ultra-low-noise, fixed-rate, line-rejected measurements. |
| MAX11200EEE+ | 24-bit, 10SPS, 0.15ppm noise, but only 50Hz or 60Hz selectable-not simultaneous; 20-pin TSSOP package. | Offers lower noise but narrower line-rejection flexibility and larger footprint than SSOP-16. | Choose MAX11200EEE+ for lowest noise in 50Hz-only regions; LTC2435IGN#PBF delivers broader global compatibility and smaller board area. |
Compared with ADS124S08IPWR and MAX11200EEE+, the LTC2435IGN#PBF uniquely combines simultaneous 50/60Hz rejection, SO-8 footprint compatibility, and no-latency 20-bit conversion-making it optimal for space-constrained, globally certified instrumentation where deterministic timing and minimal external components are critical.
Availability
LTC2435IGN#PBF is available at Aetrix Electronics and suitable for industrial process control, precision weigh scales, and portable gas analyzers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2435IGN#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2435IGN#PBF belongs to ADI's legacy Linear Technology precision ADC product line, engineered specifically for low-power, high-accuracy sensor digitization in demanding industrial and test equipment applications.
FAQ
What is the operating temperature range for the LTC2435IGN#PBF?
The LTC2435IGN#PBF is rated for –40°C to +85°C operation, as indicated by the "I" grade suffix in its part number. This extended industrial temperature range ensures reliable performance in harsh environments such as factory automation controllers, outdoor environmental sensors, and motor drive feedback circuits where ambient temperatures exceed commercial limits.
Does the LTC2435IGN#PBF require external passive components for line-frequency rejection?
No, the LTC2435IGN#PBF does not require external passive components for line-frequency rejection. Its integrated oscillator eliminates crystals or RC networks, and the FO pin configures internal digital filtering for 50Hz, 60Hz, or simultaneous 50/60Hz rejection-enabling complete line-noise suppression with zero external parts.
How does the LTC2435IGN#PBF achieve no-latency conversion?
The LTC2435IGN#PBF achieves no-latency conversion through its proprietary delta-sigma architecture with single-cycle settling and transparent full-scale auto-calibration. Each 24-bit output corresponds precisely to the immediately preceding analog sample-no pipeline delay, no redundant samples, and no filter settling time-ensuring deterministic timing for real-time multiplexed sensor systems.
Can the LTC2435IGN#PBF interface directly with a 3.3V microcontroller SPI bus?
Yes, the LTC2435IGN#PBF supports 3.3V logic levels: VIH is 2.0V min and VIL is 0.6V max at VCC = 2.7–3.3V, and SDO VOL is 0.4V max at 1.6mA load. Its 3-wire interface operates natively with standard SPI peripherals-no level shifters required when VCC = 3.3V and microcontroller I/O tolerates 3.3V signals.
What is the purpose of the seven GND pins on the LTC2435IGN#PBF SSOP-16 package?
The seven GND pins on the LTC2435IGN#PBF serve distinct roles: low-impedance return paths for analog input/reference currents, digital switching currents, and VCC decoupling. They minimize ground bounce and inter-rail coupling-critical for achieving 0.8ppm RMS noise and 120dB CMR. All seven must be connected to a solid ground plane; omitting any degrades noise and line-rejection performance.
LTC2435IGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- microPOWER™
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 20
- Sampling Rate (Per Second):
- 15
- 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:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2435IGN#PBF FAQ
1.How can I place an order for LTC2435IGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2435IGN#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 LTC2435IGN#PBF reliable?
The price and inventory of LTC2435IGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2435IGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC2435IGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2435IGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2435IGN#PBF?
LTC2435IGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2435IGN#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 LTC2435IGN#PBF?
For technical support, including LTC2435IGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2435IGN#PBF requirements.
6.How does Aetrix verify that LTC2435IGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2435IGN#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 LTC2435IGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC2435IGN#PBF?
All LTC2435IGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2435IGN#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 LTC2435IGN#PBF part is unused and in its original packaging.
Return procedure for LTC2435IGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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