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Analog Devices Inc. LTC2435CGN#TRPBF
- Part No.:
- LTC2435CGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC2435CGN#TRPBF.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,981
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Product details
Overview
LTC2435CGN#TRPBF from Analog Devices (formerly Linear Technology) is a 20-bit micropower delta-sigma ADC with differential input and differential reference, 3 ppm INL, 0.8 ppm RMS noise, and single-cycle settling for multiplexed sensor digitization in precision industrial instrumentation and weigh scales.
For engineers reviewing the LTC2435CGN#TRPBF datasheet, LTC2435CGN#TRPBF pinout, LTC2435CGN#TRPBF application, or LTC2435CGN#TRPBF equivalent, key selection criteria include its 15 Hz output rate with 60 Hz notch rejection, internal oscillator eliminating external timing components, and GND-to-VCC common-mode range supporting direct bridge sensor interfacing.
Technical Context
The LTC2435CGN#TRPBF implements a decimating FIR filter with auto-calibration architecture, achieving no-latency conversion by holding each result in a static shift register until read out. Its modulator operates at a fixed internal clock derived from an on-chip oscillator, enabling deterministic 60 Hz (FO = GND) or 50 Hz (FO = VCC) line-frequency rejection without external components.
It supports both internal SCK mode (SCK as output) and external SCK mode (SCK as input), with flexible 3-wire SPI/MICROWIRE-compatible interface. The FO pin selects between internal oscillator operation (50/60 Hz rejection) or external clock synchronization (fEOSC/2560 notch), and the CS pin controls sleep/wake transitions and data output initiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit with no missing codes - guarantees monotonicity and full-scale accuracy across entire input range. |
| INL | 3 ppm of VREF - enables 6½-digit DVM-level linearity without system calibration. |
| RMS Noise | 0.8 ppm of VREF - supports sub-1 µV resolution in 5 V reference systems. |
| Output Rate | 15 Hz (LTC2435 variant) - optimized for low-drift, high-rejection measurements in noisy AC environments. |
| Supply Current | 200 µA active, 4 µA auto-sleep - allows battery-powered portable instrumentation with multi-year runtime. |
| Input Range | –0.5×VREF to +0.5×VREF differential - matches standard bridge sensor outputs without gain stages. |
| Common-Mode Range | GND to VCC for both inputs and reference - permits direct connection to remote-sensing transducers with floating grounds. |
Pinout & Package
Package: 16-lead plastic SSOP (GN), 0°C to 70°C operating temperature range, SO-8 footprint compatible.
| 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, and power currents-mandatory for 20-bit noise performance. |
| VCC (Pin 2) | Positive supply | 2.7 V to 5.5 V single supply; requires local 10 µF tantalum + 0.1 µF ceramic decoupling for stable conversion. |
| REF+, REF– (Pins 3, 4) | Differential reference inputs | Accept 0.1 V to VCC differential reference; enable ratiometric sensing and eliminate reference drift errors. |
| IN+, IN– (Pins 5, 6) | Differential analog inputs | Support –0.5×VREF to +0.5×VREF full-scale range with >120 dB DC common-mode rejection. |
| FO (Pin 14) | Frequency control | Selects internal 50 Hz (FO = VCC), 60 Hz (FO = GND), or external fEOSC/2560 notch-no configuration registers required. |
| CS (Pin 11) | Chip select | Active-low wake/sleep control; initiates data output and triggers new conversion when asserted mid-transfer. |
| SDO (Pin 12) | Serial data output | Three-state output; holds conversion result during sleep; shifts out 24-bit data on falling SCK edge. |
| SCK (Pin 13) | Serial clock | Bidirectional: output in internal-clock mode, input in external-clock mode; auto-detected at power-up or CS edge. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency delta-sigma architecture | Each 24-bit output corresponds exactly to the most recent conversion-enables true real-time multiplexed sensor sampling without pipeline delay. |
| Integrated oscillator with programmable notch | Eliminates crystals, capacitors, or external clocks; delivers >110 dB 60 Hz rejection (FO = GND) without component count or layout sensitivity. |
| Full-scale auto-calibration per cycle | Maintains <10 ppm full-scale drift over temperature and supply variation-removes need for periodic system recalibration in field-deployed equipment. |
| GND-to-VCC input and reference common-mode range | Allows direct interface to strain gages, RTDs, and thermocouples with arbitrary common-mode voltages-no level-shifting amplifiers required. |
| 200 µA active / 4 µA sleep current | Enables continuous high-precision measurement in energy-constrained applications such as handheld test meters and wireless sensor nodes. |
Applications
| Weight Scales | Direct Temperature Measurement |
|---|---|
Use Scenario: High-accuracy platform scales measuring 0.1 g resolution over 30 kg range using 350 Ω load cells in noisy factory environments with 60 Hz mains interference. IC Role / Device Role / Timing Role: Direct digitizer of bridge output; provides 20-bit resolution with 60 Hz notch (FO = GND) and ratiometric reference tracking. Use Value: Eliminates external instrumentation amplifier and reference IC, reducing BOM cost by $1.20 and PCB area by 22 mm² while maintaining ±0.01% linearity. | Use Scenario: Precision RTD-based temperature monitoring in HVAC controllers where ambient 50/60 Hz noise corrupts microvolt-level sensor signals. IC Role / Device Role / Timing Role: ADC front-end with differential reference tied to excitation current sense resistor; rejects 50 Hz and 60 Hz simultaneously (LTC2435-1 variant). Use Value: Achieves <±0.05 °C accuracy over –20°C to +85°C without software filtering or hardware shielding-reducing firmware complexity and EMI testing cost. |
| Gas Analyzers | Strain Gage Transducers |
Use Scenario: Electrochemical gas sensors producing <10 mV full-scale output in battery-powered portable detectors requiring 16+ bit effective resolution. IC Role / Device Role / Timing Role: Low-power ADC with 0.8 ppm RMS noise and 4 µA sleep current; interfaces directly to sensor's differential output and reference. Use Value: Enables >10-year battery life in continuous-monitoring mode while resolving sub-ppm gas concentration changes-critical for safety-critical deployments. | Use Scenario: Structural health monitoring of bridges using 120 Ω foil strain gages exposed to wide temperature swings and vibration-induced noise. IC Role / Device Role / Timing Role: High-common-mode-rejection ADC (120 dB DC CMRR) with GND-to-VCC input range accepting offset-shifted bridge outputs. Use Value: Removes need for discrete op-amp signal conditioning stage, cutting thermal drift error by 40% and improving long-term zero stability by 3×. |
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 |
|---|---|---|---|
| ADS1248IPWR | 24-bit resolution, 2 kSPS max, integrated PGA and reference; requires external crystal for best 50/60 Hz rejection. | Higher speed and on-chip gain suitable for low-level thermocouple signals; less optimal for ultra-low-power battery use due to 350 µA active current. | Choose ADS1248IPWR when system requires programmable gain and faster throughput; LTC2435CGN#TRPBF preferred for lowest power and simplest layout. |
| LTC2440CGN#TRPBF | 24-bit resolution, 7.5 Hz output rate, 0.3 ppm RMS noise, same SSOP-16 package and pinout; supports simultaneous 50/60 Hz rejection only in LTC2440-1 variant. | Lower noise and higher resolution but half the output rate; identical interface and power profile-drop-in upgrade path for noise-critical applications. | Choose LTC2440CGN#TRPBF when sub-0.5 ppm noise is mandatory and 7.5 Hz update rate is acceptable; LTC2435CGN#TRPBF offers better speed/power trade-off. |
Compared with ADS1248IPWR and LTC2440CGN#TRPBF, the LTC2435CGN#TRPBF delivers optimal balance of 20-bit precision, 15 Hz throughput, 200 µA supply current, and zero-component 60 Hz rejection-making it ideal for cost-sensitive, space-constrained, and battery-operated instrumentation where simplicity and reliability outweigh raw resolution.
Availability
LTC2435CGN#TRPBF is available at Aetrix Electronics and suitable for weight scales, gas analyzers, and strain gage transducers requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.
Supply support for LTC2435CGN#TRPBF 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 LTC2435CGN#TRPBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for low-power, high-accuracy sensor digitization in instrumentation, process control, and portable test equipment where line-frequency immunity and minimal external components are critical.
FAQ
What is the maximum output data rate of the LTC2435CGN#TRPBF?
The LTC2435CGN#TRPBF has a fixed output data rate of 15 Hz when using its internal oscillator with FO = GND (60 Hz rejection mode). This rate is determined by the internal decimation filter structure and cannot be increased via external clocking-the device maintains 15 Hz regardless of external oscillator frequency, as conversion time scales inversely with fEOSC.
Does the LTC2435CGN#TRPBF require external passive components for line-frequency rejection?
No, the LTC2435CGN#TRPBF does not require external passive components for 50 Hz or 60 Hz rejection. Its on-chip oscillator and fixed digital filter provide >110 dB rejection at 60 Hz (FO = GND) or 50 Hz (FO = VCC) without crystals, capacitors, or resistors-reducing bill-of-materials and layout sensitivity.
Can the LTC2435CGN#TRPBF interface directly with a 350 Ω Wheatstone bridge without signal conditioning?
Yes, the LTC2435CGN#TRPBF can interface directly with a 350 Ω Wheatstone bridge. Its differential input range of –0.5×VREF to +0.5×VREF, GND-to-VCC common-mode range, and 120 dB DC common-mode rejection allow direct connection to bridge outputs referenced to excitation voltage, eliminating the need for instrumentation amplifiers in many precision scale designs.
What is the function of the FO pin on the LTC2435CGN#TRPBF?
The FO pin on the LTC2435CGN#TRPBF selects the line-frequency rejection mode: FO = GND enables 60 Hz ±2% rejection (LTC2435), FO = VCC enables 50 Hz ±2% rejection (LTC2435), and FO driven by external clock fEOSC enables notch at fEOSC/2560. It configures the digital filter null without registers or firmware-hardware-only selection.
How does the LTC2435CGN#TRPBF achieve no-latency operation?
The LTC2435CGN#TRPBF achieves no-latency operation by storing each completed conversion result in a static shift register and making it immediately available for readout. There is no pipeline delay or filter settling-every 24-bit output corresponds precisely to the most recent analog sample, enabling deterministic timing in multiplexed sensor systems.
LTC2435CGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- microPOWER™
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2435CGN#TRPBF FAQ
1.How can I place an order for LTC2435CGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2435CGN#TRPBF 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 LTC2435CGN#TRPBF reliable?
The price and inventory of LTC2435CGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2435CGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2435CGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2435CGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2435CGN#TRPBF?
LTC2435CGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2435CGN#TRPBF 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 LTC2435CGN#TRPBF?
For technical support, including LTC2435CGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2435CGN#TRPBF requirements.
6.How does Aetrix verify that LTC2435CGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2435CGN#TRPBF 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 LTC2435CGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2435CGN#TRPBF?
All LTC2435CGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2435CGN#TRPBF, 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 LTC2435CGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC2435CGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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