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Analog Devices Inc. LTC2408IG#TRPBF
- Part No.:
- LTC2408IG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC2408IG#TRPBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,732
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Product details
Overview
LTC2408IG#TRPBF from Analog Devices (formerly Linear Technology) is an 8-channel, 24-bit micropower delta-sigma ADC with no-latency digital filtering, 4 ppm INL, 0.3 ppm RMS noise, and integrated oscillator. It operates from 2.7V to 5.5V, accepts reference voltages from 0.1V to VCC, and delivers valid first-conversion results after channel change-ideal for high-precision multiplexed sensor acquisition in industrial instrumentation.
For engineers reviewing the LTC2408IG#TRPBF datasheet, LTC2408IG#TRPBF pinout, LTC2408IG#TRPBF application, or LTC2408IG#TRPBF equivalent, key selection criteria include its 110 dB 50/60 Hz notch rejection, extended input range (–12.5% to +112.5% VREF), SPI/MICROWIRE-compatible 4-wire interface, and auto-calibrating architecture enabling stable long-term measurements without external timing components.
Technical Context
The LTC2408IG#TRPBF employs a delta-sigma modulator with decimating FIR filter and on-chip autocalibration that performs offset and full-scale correction every conversion cycle. Its internal oscillator eliminates need for external crystals while supporting user-selectable 50 Hz or 60 Hz ±2% line-frequency rejection via the FO pin.
It features an 8-channel analog multiplexer with break-before-make switching (290 ns), 120–300 Ω on-resistance (dependent on VCC), and live-zero input range accommodating sensor offset and overrange conditions. The serial interface supports both internal SCK (19.2 kHz) and external clock modes (2.56–307.2 kHz), with 32-bit output format including sign, status, 24-bit result, and 4 sub-LSBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes-guarantees monotonicity and full dynamic range utilization. |
| INL | 4 ppm of VREF max-enables 16-bit+ effective linearity in precision measurement systems. |
| RMS Noise | 0.3 ppm of VREF-supports <1 µV RMS noise floor with 5 V reference for ultra-low-noise applications. |
| Supply Current | 200 µA typical in conversion mode-enables battery-powered operation with minimal power budget impact. |
| Input Range | –0.125 × VREF to +1.125 × VREF-accommodates sensor offset, gain error, and overrange without clipping. |
| Notch Rejection | ≥110 dB at 50 Hz or 60 Hz ±2%-eliminates mains interference without external filtering. |
| Reference Range | 0.1 V to VCC-allows flexible scaling from low-voltage sensors to full-supply references. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 5.6 mm × 10.2 mm, 0.635 mm pitch, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,5,6,16,18,22,27,28) | Ground reference | Multiple dedicated ground pins minimize ground bounce and improve PSRR in noisy environments. |
| VCC (Pins 2,8) | Positive supply | 2.7–5.5 V single supply; requires local 10 µF tantalum + 0.1 µF ceramic bypassing. |
| VREF (Pin 3) | Reference input | Accepts 0.1 V to VCC; defines full-scale and noise floor; determines input range scaling. |
| ADCIN (Pin 4) | Analog input node | Connects to MUXOUT for standard operation; receives selected channel's conditioned signal. |
| MUXOUT (Pin 7) | Multiplexer output | Drives ADCIN; must be tied directly to Pin 4 unless external signal conditioning is inserted. |
| CH0–CH7 (Pins 9–12,13,14,15,17) | Analog channel inputs | 8 independent inputs; CH4–CH7 are no-connect on LTC2404 but functional on LTC2408IG#TRPBF. |
| FO (Pin 26) | Filter oscillator control | Selects 50 Hz (FO = VCC), 60 Hz (FO = GND), or external frequency (FO = clock) for notch tuning. |
| CSADC / CSMUX (Pins 23,20) | Chip select inputs | Enable ADC data output and MUX channel addressing; driven in parallel for 4-wire simplicity. |
| SCK / CLK (Pins 25,19) | Serial clock | Controls data shift-in (CLK) and shift-out (SCK); tied together for standard SPI/MICROWIRE operation. |
| SDO (Pin 24) | Digital output | 3-state serial output; provides EOC bit (Bit 31) and 32-bit conversion result MSB-first. |
| DIN (Pin 21) | Digital input | Receives 4-bit channel address during MUX setup; sampled on rising CLK edges while CSMUX = HIGH. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency digital filter | Single-cycle settling enables immediate valid conversion after channel change-no dead time or discarded samples. |
| Auto-calibrating architecture | Per-conversion offset and full-scale calibration ensures long-term stability against temperature, supply, and aging drift. |
| Extended input range | –12.5% to +112.5% VREF accommodates sensor zero-offset, amplifier gain errors, and transient overvoltage events. |
| Integrated oscillator | Eliminates external crystal/capacitor requirements while maintaining precise 50/60 Hz rejection without component tolerance sensitivity. |
| Flexible reference support | 0.1 V minimum reference allows use with low-voltage precision references or ratiometric sensor bridges. |
Applications
| Weight Scales | Direct Temperature Measurement |
|---|---|
Use Scenario: High-resolution load cell readout in platform scales and laboratory balances requiring 100,000+ counts resolution. IC Role / Device Role / Timing Role: 24-bit ADC digitizes mV-level bridge outputs; internal oscillator synchronizes rejection to AC mains frequency. Use Value: 4 ppm INL and 0.3 ppm noise enable sub-10 µV resolution with 5 V reference-critical for NTEP-certified accuracy. | Use Scenario: Direct RTD or thermistor readout in HVAC controllers and environmental monitoring nodes. IC Role / Device Role / Timing Role: 8-channel mux sequentially samples multiple temperature sensors; extended input range absorbs self-heating offsets. Use Value: Live-zero input range (–12.5% VREF) captures negative temperature coefficients without external level-shifting circuitry. |
| Gas Analyzers | Strain Gauge Transducers |
Use Scenario: Electrochemical or NDIR gas sensor signal conditioning where low-frequency drift dominates measurement uncertainty. IC Role / Device Role / Timing Role: Delta-sigma ADC with autocalibration rejects 1/f noise and maintains baseline stability over hours of continuous operation. Use Value: Per-conversion calibration reduces long-term offset drift to <0.01 ppm/°C-enabling ppm-level gas concentration detection. | Use Scenario: Structural health monitoring using bonded foil or MEMS strain gauges in aerospace or civil infrastructure. IC Role / Device Role / Timing Role: High-precision ADC interfaces quarter-bridge configurations with programmable gain amplifiers. Use Value: 110 dB 50/60 Hz rejection suppresses electromagnetic interference from nearby motors or lighting ballasts. |
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, 2kSPS, integrated PGA (1–128×), no internal oscillator-requires external clock or crystal. | Requires external timing source and PGA configuration; better for variable-gain sensor front-ends. | Choose ADS1248IPWR when programmable gain and higher throughput (>15 SPS) are needed, accepting added BOM and layout complexity. |
| MAX11200EEE+ | 24-bit, 10 SPS, 120 dB 50/60 Hz rejection, lower supply current (135 µA), no MUX-single-channel only. | Lacks multiplexer; optimized for ultra-low-power single-sensor nodes with extreme line rejection. | Choose MAX11200EEE+ for battery-powered single-input applications where lowest possible current and maximum notch depth are critical. |
Compared with ADS1248IPWR and MAX11200EEE+, the LTC2408IG#TRPBF uniquely combines integrated oscillator, 8-channel MUX, no-latency filtering, and live-zero input range-making it optimal for compact, self-contained, multi-sensor industrial DAQ systems without external timing or gain components.
Availability
LTC2408IG#TRPBF is available at Aetrix Electronics and suitable for industrial process control, precision instrumentation, and embedded data acquisition requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC2408IG#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 LTC2408IG#TRPBF belongs to ADI's legacy Linear Technology precision ADC product line, designed specifically for low-power, high-accuracy sensor interface applications where calibration stability, noise performance, and ease of integration are critical.
FAQ
What is the operating temperature range for the LTC2408IG#TRPBF?
The LTC2408IG#TRPBF is rated for –40°C to +85°C (Industrial grade). This range is confirmed in the "Order Information" section of the datasheet and applies to all electrical specifications unless otherwise noted. The "I" suffix in LTC2408IG#TRPBF explicitly denotes the industrial temperature grade, distinguishing it from the commercial-grade "C" version (0°C to 70°C).
Does the LTC2408IG#TRPBF require external passive components for its internal oscillator?
No, the LTC2408IG#TRPBF does not require external passive components for its internal oscillator. As stated in the datasheet features and functional block diagram, the oscillator is fully integrated and needs no crystals, capacitors, or resistors-enabling true "no-component" clocking for 50 Hz or 60 Hz notch rejection when the FO pin is tied to VCC or GND.
How does the LTC2408IG#TRPBF handle channel switching and conversion validity?
The LTC2408IG#TRPBF guarantees that the first conversion after a channel change is always valid due to its no-latency delta-sigma architecture. Unlike conventional sigma-delta converters requiring filter settling, its digital filter settles in a single cycle-eliminating invalid or discarded samples and simplifying multiplexed system firmware design.
What is the function of the FO pin on the LTC2408IG#TRPBF?
The FO pin on the LTC2408IG#TRPBF controls the notch frequency of the internal digital filter and conversion timing. When FO = VCC, rejection is centered at 50 Hz; when FO = GND, at 60 Hz; and when driven by an external clock (fEOSC), the first null occurs at fEOSC/2560, enabling user-defined line-frequency rejection from 1 Hz to 120 Hz.
Can the LTC2408IG#TRPBF operate with a reference voltage below 1 V?
Yes, the LTC2408IG#TRPBF supports reference voltages as low as 0.1 V per the datasheet's "Reference Voltage Range" specification. Operation at low VREF is valid and maintains full 24-bit resolution, though INL improves while absolute noise floor (in µV) remains nearly constant-making it suitable for low-voltage ratiometric sensor interfaces.
LTC2408IG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- microPOWER™
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 7.5
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-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:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2408IG#TRPBF FAQ
1.How can I place an order for LTC2408IG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2408IG#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 LTC2408IG#TRPBF reliable?
The price and inventory of LTC2408IG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2408IG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2408IG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2408IG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2408IG#TRPBF?
LTC2408IG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2408IG#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 LTC2408IG#TRPBF?
For technical support, including LTC2408IG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2408IG#TRPBF requirements.
6.How does Aetrix verify that LTC2408IG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2408IG#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 LTC2408IG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2408IG#TRPBF?
All LTC2408IG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2408IG#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 LTC2408IG#TRPBF part is unused and in its original packaging.
Return procedure for LTC2408IG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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