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Analog Devices Inc. LTC2435CGN#PBF
- Part No.:
- LTC2435CGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC2435CGN#PBF.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,442
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Product details
Overview
LTC2435CGN#PBF from Analog Devices (formerly Linear Technology) is a 20-bit micropower delta-sigma ADC with differential input and differential reference, 3ppm INL, 0.8ppm RMS noise, and single-cycle settling for multiplexed sensor interfaces in precision industrial measurement systems.
For engineers reviewing the LTC2435CGN#PBF datasheet, LTC2435CGN#PBF pinout, LTC2435CGN#PBF application, or LTC2435CGN#PBF equivalent, key selection criteria include its 15Hz output rate with 60Hz notch rejection, internal oscillator eliminating external timing components, and GND-to-VCC common-mode range supporting direct strain gage or thermocouple digitization.
Technical Context
The LTC2435CGN#PBF implements a no-latency delta-sigma architecture with integrated decimating FIR filter and autocalibration DAC, enabling true one-to-one correspondence between conversion and output data without filter settling delay. Its modulator operates at a fixed internal clock derived from an on-chip oscillator.
It supports two digital interface modes: internal SCK (SCK pin outputs clock at 19.2kHz) or external SCK (SCK pin accepts up to 2MHz clock), with CS-controlled state transitions between conversion, sleep (4µA), and 24-bit serial data output. FO pin configures notch frequency-GND enables 60Hz rejection (or simultaneous 50/60Hz for LTC2435-1), VCC selects 50Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit with no missing codes; full-scale range = ±0.5×VREF ensures unambiguous digitization of bipolar sensor outputs. |
| INL | 3ppm of VREF max; guarantees ≤±1 LSB error across full scale for high-accuracy weight scales and DVMs. |
| RMS Noise | 0.8ppm of VREF (4µVRMS); enables 20-bit effective resolution without oversampling in low-drift applications. |
| Output Rate | 15Hz (LTC2435); provides deterministic timing for synchronized multi-channel sampling in data acquisition systems. |
| Common-Mode Rejection | 120dB DC, 140dB at 50/60Hz; rejects ground loop interference in remote sensor configurations. |
| Supply Current | 200µA active, 4µA auto-sleep; supports battery-powered instrumentation with minimal power budget impact. |
| Reference Range | 0.1V to VCC differential; allows ratiometric sensing with variable excitation or remote RTD bridges. |
Pinout & Package
Package: 16-lead plastic SSOP (GN), 0°C to 70°C operating temperature, SO-8 footprint compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,7–10,15,16) | Ground reference | Seven dedicated ground pins minimize ground bounce and enable robust decoupling for high-PSRR performance. |
| VCC (Pin 2) | Positive supply | 2.7V–5.5V single supply; requires 10µF tantalum + 0.1µF ceramic bypass for stable operation. |
| REF+ / REF– (Pins 3,4) | Differential reference inputs | Accept 0.1V–VCC differential voltage; independent common-mode range (GND to VCC) enables flexible bridge biasing. |
| IN+ / IN– (Pins 5,6) | Differential analog inputs | Support –0.5VREF to +0.5VREF differential range with GND–0.3V to VCC+0.3V absolute limits for overrange tolerance. |
| FO (Pin 14) | Frequency control | Selects internal 50Hz/60Hz notch (VCC/GND) or external clock (fEOSC/2560 notch); no external components required. |
| CS (Pin 11) | Chip select | Active-low wake-up signal; controls transition from sleep (4µA) to data output; aborts transfer if raised mid-read. |
| SDO (Pin 12) | Serial data output | Three-state output; holds conversion result during sleep; outputs 24-bit MSB-first data synchronized to SCK. |
| SCK (Pin 13) | Serial clock | Bidirectional: outputs internal 19.2kHz clock (LTC2435) or accepts external ≤2MHz clock for flexible timing control. |
Key Features
| Feature | Design Value |
|---|---|
| No latency delta-sigma conversion | Single-cycle settling eliminates multiplexing dead time-each conversion corresponds directly to one 24-bit output word. |
| Integrated oscillator | Removes need for crystals, capacitors, or external clocks-reduces BOM count and layout complexity in space-constrained designs. |
| Differential input & reference | Independent GND-to-VCC common-mode ranges for IN and REF allow remote sensing with floating bridges or isolated transducers. |
| Auto-calibration per cycle | Full-scale calibration on every conversion maintains <10ppm gain drift over temperature and supply variation. |
| Flexible 3-wire SPI/MICROWIRE interface | Hardware-mode selection (via SCK power-up state) avoids register programming-simplifies firmware integration. |
Applications
| Strain Gage Transducers | Direct Temperature Measurement |
|---|---|
Use Scenario: High-precision load cell readout in industrial weighing systems with 50/60Hz AC line noise. IC Role / Device Role / Timing Role: Direct digitizer for mV-level bridge outputs; uses internal 60Hz notch (FO=GND) and 20-bit resolution to resolve sub-gram changes. Use Value: Eliminates external amplification and filtering stages-reduces component count while maintaining 120dB CMRR against ground loops. | Use Scenario: Cold-junction compensation and thermocouple voltage digitization in HVAC controllers. IC Role / Device Role / Timing Role: ADC with programmable reference (0.1V–VCC) and wide input common-mode range digitizes µV-level thermocouple signals referenced to local sensor ground. Use Value: Enables direct connection to thermocouples without level-shifting op-amps-improves long-term stability by avoiding amplifier offset drift. |
| Gas Analyzers | 6-Digit DVMs |
Use Scenario: Low-power electrochemical gas sensor signal conditioning in portable air quality monitors. IC Role / Device Role / Timing Role: Micropower ADC (4µA sleep) digitizes sensor current via precision shunt resistor; uses differential input to reject PCB thermal gradients. Use Value: Achieves 0.8ppm RMS noise at 15Hz output rate-supports detection of sub-ppm gas concentrations without external averaging. | Use Scenario: Benchtop digital multimeter requiring 6½-digit accuracy and high line-rejection in lab environments. IC Role / Device Role / Timing Role: Core converter with 3ppm INL and 140dB 50/60Hz rejection serves as primary digitizer for calibrated reference voltages. Use Value: Delivers guaranteed monotonicity and no missing codes-ensures traceable metrology-grade measurements without post-processing correction. |
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 |
|---|---|---|---|
| ADS124S08IPW | 24-bit resolution, 4kSPS max, integrated PGA and sensor bias; requires external clock or crystal for best line rejection. | Targets higher-speed multi-sensor systems with onboard excitation; less suitable for ultra-low-power (<5µA) or crystal-free deployments. | Choose ADS124S08IPW when PGA gain flexibility and faster throughput outweigh the need for zero-component timing and lowest sleep current. |
| LTC2440IGN#PBF | 24-bit, 10Hz output, 2ppm INL, but lacks internal oscillator-requires external 1.024MHz clock for 50/60Hz rejection. | Used in ultra-high-precision metrology where 2ppm INL justifies added clock circuitry and board area. | Choose LTC2440IGN#PBF only when 24-bit resolution and lower INL are mandatory and external timing is acceptable. |
Compared with ADS124S08IPW and LTC2440IGN#PBF, the LTC2435CGN#PBF uniquely combines 20-bit precision, crystal-free 60Hz rejection, and 4µA sleep mode-making it optimal for cost-sensitive, space-constrained, and battery-operated instrumentation where simplicity and power efficiency are prioritized over maximum resolution.
Availability
LTC2435CGN#PBF is available at Aetrix Electronics and suitable for precision instrumentation, industrial process control, and portable gas analyzers requiring stable component supply with guaranteed long-term availability.
Supply support for LTC2435CGN#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 LTC2435CGN#PBF belongs to Linear's precision delta-sigma ADC product line, designed specifically for low-power, high-accuracy sensor digitization in industrial, medical, and test equipment where line-frequency immunity and ease of use are critical.
FAQ
What is the maximum output data rate of the LTC2435CGN#PBF?
The LTC2435CGN#PBF delivers a fixed 15Hz output data rate when using its internal oscillator. This rate is optimized for 60Hz line-frequency rejection (FO = GND). With an external oscillator, the output rate becomes fEOSC/2560, allowing user-defined rates-for example, 153.6kHz external clock yields 60Hz rejection and same 15Hz output. The LTC2435CGN#PBF does not support variable-rate operation without changing the clock source.
Does the LTC2435CGN#PBF require external passive components for its internal oscillator?
No, the LTC2435CGN#PBF requires no external passive components for its internal oscillator. The oscillator is fully integrated and factory-trimmed, enabling immediate 50Hz or 60Hz notch filtering upon power-up with only FO pin configuration (VCC or GND). This eliminates crystals, capacitors, or resistors traditionally needed for timing accuracy in precision ADCs like the LTC2435CGN#PBF.
How does the LTC2435CGN#PBF handle offset drift over temperature?
Offset drift for the LTC2435CGN#PBF is specified at 100nV/°C maximum. This low drift-combined with initial offset error ≤5mV-enables stable DC measurements across 0°C to 70°C without periodic recalibration. The LTC2435CGN#PBF achieves this through a new modulator architecture that minimizes thermal coefficient dependencies, making it suitable for unattended temperature monitoring systems.
Can the LTC2435CGN#PBF interface directly with a 3.3V microcontroller SPI port?
Yes, the LTC2435CGN#PBF supports 3.3V logic levels: VIH is 2.0V min (for VCC = 2.7–3.3V), VOL is 0.4V max, and SDO drives to VCC – 0.5V. When VCC = 3.3V, its outputs are fully compatible with standard 3.3V SPI peripherals. Pull-up resistors are unnecessary due to the internal weak pull-up on SCK in internal-clock mode, simplifying interconnection with the LTC2435CGN#PBF.
What is the purpose of the seven GND pins on the LTC2435CGN#PBF SSOP package?
The seven GND pins (Pins 1,7–10,15,16) on the LTC2435CGN#PBF provide low-impedance return paths for analog, digital, and substrate currents-minimizing ground bounce and improving PSRR and CMRR. All seven must be connected to a solid ground plane; splitting or omitting any degrades noise performance and line-rejection capability, especially critical for achieving the specified 140dB 60Hz rejection in the LTC2435CGN#PBF.
LTC2435CGN#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2435CGN#PBF FAQ
1.How can I place an order for LTC2435CGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2435CGN#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 LTC2435CGN#PBF reliable?
The price and inventory of LTC2435CGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2435CGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC2435CGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2435CGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2435CGN#PBF?
LTC2435CGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2435CGN#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 LTC2435CGN#PBF?
For technical support, including LTC2435CGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2435CGN#PBF requirements.
6.How does Aetrix verify that LTC2435CGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2435CGN#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 LTC2435CGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC2435CGN#PBF?
All LTC2435CGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2435CGN#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 LTC2435CGN#PBF part is unused and in its original packaging.
Return procedure for LTC2435CGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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