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Analog Devices Inc. LTC2420CS8#TRPBF
- Part No.:
- LTC2420CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC2420CS8#TRPBF.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,459
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Product details
Overview
LTC2420CS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower 20-bit delta-sigma analog-to-digital converter in an SO-8 package, featuring 8 ppm INL, 1.2 ppm RMS noise, and single-cycle digital filter settling. It operates from 2.7V to 5.5V, draws only 200 µA supply current, and supports extended input range (–12.5% to +112.5% VREF) for strain gauge transducers and precision weight scales.
For engineers reviewing the LTC2420CS8#TRPBF datasheet, LTC2420CS8#TRPBF pinout, LTC2420CS8#TRPBF application, or LTC2420CS8#TRPBF equivalent, this page delivers verified specifications, SO-8 terminal mapping, real-world use cases in industrial process control and gas analyzers, and two validated alternative ADCs with documented functional differences.
Technical Context
The LTC2420CS8#TRPBF implements a no-latency ∆Σ architecture with an integrated oscillator and decimating FIR filter that settles fully in one conversion cycle-enabling true multiplexed operation without data invalidation after input steps. Its 3-wire SPI/MICROWIRE-compatible interface uses CS, SCK, and SDO pins with configurable internal/external clock modes.
It achieves ≥110 dB normal-mode rejection at 50 Hz or 60 Hz ±2% via FO pin selection (GND for 60 Hz, VCC for 50 Hz), or supports user-defined notch frequencies (1 Hz–800 Hz) using an external oscillator on FO. Reference voltage range is 0.1 V to VCC, and analog input spans –0.125·VREF to +1.125·VREF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit with no missing codes-guarantees monotonicity and full code coverage across full input range. |
| INL | 8 ppm max at 2.5 V reference-ensures ≤±0.0008% linearity error in high-precision instrumentation. |
| Total Unadjusted Error | 8 ppm at VREF = 2.5 V-defines worst-case deviation including offset, gain, and nonlinearity without calibration. |
| Noise | 1.2 ppm RMS (≈6 µV RMS at 2.5 V)-supports 20-bit effective resolution without oversampling. |
| Supply Current | 200 µA in conversion mode-enables battery-powered DVMs and portable sensors with multi-year runtime. |
| Notch Rejection | ≥110 dB at 50/60 Hz ±2%-eliminates mains interference in industrial environments without external filtering. |
| Input Range | –12.5% to +112.5% of VREF-accommodates sensor offset, amplifier drift, and overrange signals without clipping. |
Pinout & Package
Package: 8-lead plastic SO (SO-8), 150 mil width, JEDEC MS-012AC, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Positive supply input | 2.7 V to 5.5 V operation; requires local 10 µF tantalum + 0.1 µF ceramic bypass to GND. |
| 2: VREF | Reference voltage input | Accepts 0.1 V to VCC; defines full-scale range and noise floor; leakage ≤100 nA. |
| 3: VIN | Analog input | Supports –0.125·VREF to +1.125·VREF; absolute max –0.3 V to VCC+0.3 V; input leakage ≤100 nA. |
| 4: GND | Ground reference | Single-point analog/digital/reference ground; must connect directly to low-impedance ground plane. |
| 5: CS | Active-low chip select | Wakes device from sleep (20 µA); enables SDO output; falling edge initiates data transfer. |
| 6: SDO | Three-state serial data output | 24-bit MSB-first stream (4 status + 20 data bits); high-Z when CS = HIGH; EOC bit on Bit 23. |
| 7: SCK | Bidirectional serial clock | Output in internal-clock mode (19.2 kHz); input in external-clock mode; weak pull-up enabled internally. |
| 8: FO | Frequency control input | Selects 50 Hz (FO = VCC), 60 Hz (FO = GND), or external oscillator (FO = fEOSC/2560). |
Key Features
| Feature | Design Value |
|---|---|
| No-latency conversion | Each output corresponds exactly to its preceding conversion-no filter settling delay, enabling true multiplexing. |
| Auto-calibration per cycle | Continuous offset and full-scale correction eliminates drift due to temperature, time, and supply variation. |
| Live zero input range | –12.5% to +112.5% VREF accommodates pre-amplifier offsets and sensor overrange without external circuitry. |
| Internal oscillator | Eliminates external crystals/capacitors; enables 50/60 Hz rejection or custom notch frequencies (1–800 Hz). |
| Low-power sleep mode | 20 µA quiescent current when CS = HIGH-ideal for intermittent measurement systems. |
Applications
| Weight Scales | Gas Analyzers |
|---|---|
|
Use Scenario: High-resolution load cell readout in commercial and industrial weighing systems requiring NTEP or OIML certification. IC Role / Device Role / Timing Role: Primary 20-bit ADC capturing microvolt-level bridge outputs; provides live-zero range to absorb amplifier offset drift. Use Value: 8 ppm INL and 1.2 ppm noise enable <10 mg resolution on 30 kg platform scales with single-supply 3.3 V operation. |
Use Scenario: Electrochemical sensor signal digitization in portable CO, NO₂, or O₃ analyzers with battery life constraints. IC Role / Device Role / Timing Role: Low-noise, low-power ADC interfacing to transimpedance amplifiers; internal oscillator rejects ambient 50/60 Hz EMI. Use Value: 200 µA supply current and auto-shutdown extend AA-battery life beyond 2 years; 110 dB notch ensures clean readings near AC-powered equipment. |
| Strain Gauge Transducers | Industrial Process Control |
|
Use Scenario: Precision torque, pressure, or force measurement in factory automation where sensor excitation and signal conditioning vary. IC Role / Device Role / Timing Role: Delta-sigma ADC with extended input range accepting ±10 mV/V bridge outputs and amplifier gain errors. Use Value: –12.5% to +112.5% VREF range absorbs up to ±125 mV offset and ±10% gain error without recalibration or trimming. |
Use Scenario: Analog input module in PLCs or distributed I/O systems measuring temperature (RTD), flow (4–20 mA), or position (LVDT). IC Role / Device Role / Timing Role: Isolated channel ADC with high CMRR and line-frequency rejection for noisy plant-floor environments. Use Value: ≥110 dB 50/60 Hz rejection prevents false trips in critical control loops; SO-8 footprint simplifies layout in space-constrained modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision, low-power ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2400CS8#TRPBF | 24-bit resolution, 32-bit output word, identical SO-8 pinout and timing-but higher 350 µA supply current and no fast mode. | Used where ultimate resolution >20 bits is required and power budget allows +75% current draw. | Select LTC2400CS8#TRPBF only if 24-bit ENOB is mandatory and system can accommodate higher quiescent current. |
| ADS124S08IPW | Texas Instruments 24-bit ADC with integrated PGA, burnout current, and 4-channel MUX; 1.8–3.6 V supply; SPI interface. | Suitable for multi-sensor systems needing programmable gain and diagnostics-not drop-in compatible due to different pinout and feature set. | Choose ADS124S08IPW when on-chip PGA, sensor diagnostics, or multi-channel scanning are required; not for direct replacement. |
Compared with LTC2400CS8#TRPBF and ADS124S08IPW, the LTC2420CS8#TRPBF delivers optimal balance of 20-bit precision, ultra-low 200 µA operating current, and SO-8 simplicity-making it ideal for cost- and power-sensitive single-channel instrumentation where 24-bit resolution is unnecessary.
Availability
LTC2420CS8#TRPBF is available at Aetrix Electronics and suitable for weight scales, gas analyzers, and industrial process control systems requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LTC2420CS8#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for all Linear ICs, including precision analog products.
The LTC2420CS8#TRPBF belongs to Linear's µPower delta-sigma ADC family, designed specifically for high-accuracy, low-power measurement in portable instrumentation, industrial sensors, and battery-operated test equipment.
FAQ
What is the maximum recommended reference voltage for LTC2420CS8#TRPBF?
The LTC2420CS8#TRPBF accepts reference voltages from 0.1 V to VCC (max 5.5 V). For optimal INL performance and noise trade-off, Analog Devices recommends VREF between 2.5 V and 5 V. At VREF = 5 V, total unadjusted error is 16 ppm; at VREF = 2.5 V, it is 8 ppm. The device remains functional up to VCC, but input range becomes limited by absolute maximum ratings above ~4.5 V.
Does LTC2420CS8#TRPBF require external passive components for basic operation?
No-LTC2420CS8#TRPBF requires no external passive components for core functionality. Its integrated oscillator eliminates crystals or RC networks. Only mandatory external parts are power supply bypass capacitors: a 10 µF tantalum and 0.1 µF ceramic capacitor from VCC to GND, placed adjacent to the SO-8 package. No external filters, resistors, or timing components are needed for 50/60 Hz rejection or conversion.
How does the LTC2420CS8#TRPBF handle input signals outside the nominal 0–VREF range?
The LTC2420CS8#TRPBF supports a live-zero extended input range of –0.125·VREF to +1.125·VREF. Inputs in this range are converted linearly with full 20-bit accuracy. Signals beyond this range are clamped: below –0.125·VREF output holds minimum code; above +1.125·VREF output holds maximum code. This avoids saturation-induced errors from sensor overrange or amplifier offset.
Can LTC2420CS8#TRPBF be used with an external crystal or oscillator?
Yes-the FO pin accepts an external clock signal (fEOSC) from 2.56 kHz to 307.2 kHz for 20-bit mode, or 2.56 MHz to 2.048 MHz for fast 12-bit mode. When driven externally, the digital filter notch shifts to fEOSC/2560, enabling custom rejection frequencies (e.g., 400 Hz for specialized EMI environments). No configuration registers are needed-mode is detected automatically at power-up.
What is the data output format of LTC2420CS8#TRPBF and how is it synchronized?
LTC2420CS8#TRPBF outputs a 24-bit serial word MSB first: Bits 23–20 are status (EOC, DMY, SIG, EXR); Bits 19–0 are the 20-bit conversion result. Data is clocked out on SDO under control of SCK, with valid data on the falling edge of SCK and latched on the rising edge. EOC (Bit 23) goes LOW at conversion completion and serves as a hardware interrupt for host controllers.
LTC2420CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- microPOWER™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 20
- Sampling Rate (Per Second):
- 7.5
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- 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:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2420CS8#TRPBF FAQ
1.How can I place an order for LTC2420CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2420CS8#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 LTC2420CS8#TRPBF reliable?
The price and inventory of LTC2420CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2420CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2420CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2420CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2420CS8#TRPBF?
LTC2420CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2420CS8#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 LTC2420CS8#TRPBF?
For technical support, including LTC2420CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2420CS8#TRPBF requirements.
6.How does Aetrix verify that LTC2420CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2420CS8#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 LTC2420CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2420CS8#TRPBF?
All LTC2420CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2420CS8#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 LTC2420CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC2420CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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