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Analog Devices Inc. LTC2508CDKD-32#PBF
- Part No.:
- LTC2508CDKD-32#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-WFDFN Exposed Pad
- Datasheet:
-
LTC2508CDKD-32#PBF.pdf
- Description:
- IC ADC 32BIT SAR 24DFN
- Quantity:
- Payment:
- Shipping:
Inventory:337
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Product details
Overview
LTC2508CDKD-32#PBF from Analog Devices is a 32-bit oversampling successive approximation register (SAR) analog-to-digital converter with integrated configurable digital filter, operating from a single 2.5V supply and delivering ±0.5ppm INL, 145dB dynamic range at 61sps, and dual-output capability (32-bit filtered + 22-bit no-latency composite). It serves precision DC-coupled measurement systems in seismic instrumentation and high-accuracy energy exploration front-ends.
For engineers reviewing the LTC2508CDKD-32#PBF datasheet, LTC2508CDKD-32#PBF pinout, LTC2508CDKD-32#PBF application, or LTC2508CDKD-32#PBF equivalent, key selection criteria include guaranteed 32-bit no-missing-codes operation, pin-strappable down-sampling factors (256–16384), wide 0V to VREF common-mode input range, and simultaneous low-noise filtered and real-time differential+common-mode outputs.
Technical Context
The LTC2508CDKD-32#PBF implements a 32-bit SAR core with charge redistribution DAC, followed by a programmable decimating lowpass digital filter that reduces quantization noise via oversampling and down-sampling. Its dual-output architecture delivers one 32-bit 2's complement code (SDOA) after digital filtering and one 22-bit composite code (14-bit differential + 8-bit common mode, SDOB) with zero-cycle latency per conversion.
Filter configuration is set by SEL0/SEL1 pins, enabling four discrete down-sampling factors (256, 1024, 4096, 16384), directly determining output data rate (3.9ksps to 61sps) and dynamic range (131dB to 145dB). Synchronization across multiple devices is supported via the SYNC pin, and analog input common-mode rejection exceeds 128dB at 200Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 32-bit filtered output; 14-bit differential + 8-bit common mode no-latency output - enables ultra-high DC precision while preserving real-time signal integrity. |
| Dynamic Range | 145dB at 61sps (DF=16384) - supports sub-nanovolt-level signal resolution in low-bandwidth geophysical sensing. |
| INL Error | ±0.5ppm typical - ensures <1 LSB error over full scale with 5V reference (LSB = 2.3nV), critical for metrology-grade calibration. |
| Input Common-Mode Range | 0V to VREF (2.5V–5.1V) - eliminates need for level-shifting circuitry when interfacing with bipolar or unipolar sensor outputs. |
| Power Consumption | 24mW at 1Msps - achieves high-resolution sampling with minimal thermal drift in space-constrained ATE and portable instrumentation. |
| Digital Interface | SPI-compatible serial I/O (1.8V–5V OVDD) with dual independent clock/data paths (SCKA/SDOA and SCKB/SDOB) - allows concurrent readout of filtered and real-time data without bus contention. |
| Package | 24-lead 7mm × 4mm DFN with exposed pad - provides low thermal resistance (θJA = 40°C/W) and stable ground reference for high-SNR analog performance. |
Pinout & Package
24-lead plastic DFN (7mm × 4mm) with exposed thermal pad (Pin 25 = GND), RoHS-compliant lead-free finish. Pin 25 must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RDLA (1) | Filtered Output Read Enable | Active-low control for SDOA; enables 32-bit filtered data output only when asserted - prevents bus contention in multi-device SPI daisy chains. |
| RDLB (2) | No-Latency Output Read Enable | Active-low control for SDOB; enables 22-bit composite output independently of RDLA - supports asynchronous real-time monitoring alongside precision post-processing. |
| VDD (3) | Analog Core Supply | 2.375V–2.625V regulated 2.5V rail; requires 10µF ceramic bypass to GND - powers SAR core and internal reference buffer with low-noise headroom. |
| IN+ / IN– (5,6) | Differential Analog Inputs | Accept ±VREF full-scale differential swing with 0V–VREF common-mode range; input capacitance = 45pF (sample mode) - simplifies anti-aliasing design for arbitrary input signal classes. |
| REF (8–10) | Reference Voltage Input | 2.5V–5.1V external reference; requires 47µF X7R ceramic decoupling - sets LSB size (e.g., 2.3nV @ 5V) and defines full-scale range for both output modes. |
| SEL0 / SEL1 (11,12) | Down-Sampling Factor Select | Binary-coded pins selecting DF = 256, 1024, 4096, or 16384 - directly configures trade-off between output rate (3.9ksps–61sps) and dynamic range (131dB–145dB). |
| MCLK (13) | Master Clock Input | Rising-edge-triggered conversion start; minimum pulse width = 20ns - initiates acquisition phase and synchronizes internal timing for deterministic latency. |
| SYNC (14) | Multi-Device Synchronization | Edge-triggered global filter reset - aligns phase of digital filters across multiple LTC2508CDKD-32#PBF units for coherent array measurements. |
| DRL (15) | Filtered Data Ready Indicator | Active-low pulse signaling valid 32-bit code in SDOA register - enables precise timing of filtered data capture without polling or fixed delays. |
| SDOA / SCKA (17,18) | Filtered Output Serial Interface | MSB-first 2's complement data stream synchronized to SCKA rising edges - supports up to 100MHz SCKA for fast readout of high-resolution results. |
| SDOB / SCKB (20,19) | No-Latency Output Serial Interface | MSB-first 22-bit composite code (14+8) synchronized to SCKB rising edges - delivers real-time differential and common-mode values at full 1Msps sample rate. |
| BUSY (21) | Conversion Status Flag | High during conversion (578–652ns), low otherwise - provides hardware handshaking for interrupt-driven firmware or FPGA state machines. |
| OVDD (22) | Digital I/O Supply | 1.71V–5.25V logic supply; sets VIH/VIL thresholds and powers all digital pins - allows direct interface to 1.8V, 2.5V, 3.3V, or 5V host controllers without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent output streams | 32-bit filtered code (SDOA) and 22-bit no-latency composite code (SDOB) operate simultaneously - enables real-time system monitoring while performing high-precision post-processing on same sample. |
| Configurable digital lowpass filter | Four pin-selectable down-sampling factors (256–16384) adjust dynamic range (131–145dB) and output rate (3.9ksps–61sps) - replaces external analog anti-aliasing filters and reduces BOM count. |
| Wide common-mode input range | 0V to VREF (2.5V–5.1V) with ±VREF differential swing - accepts pseudo-differential unipolar, true bipolar, and fully differential signals without external biasing or gain stages. |
| Guaranteed 32-bit no missing codes | Monotonic transfer function verified across temperature (0°C–70°C) - ensures absolute accuracy for open-loop metrology and calibration applications where code dropout is unacceptable. |
| Multi-unit synchronization | Synchronous digital filter alignment via SYNC pin - enables coherent sampling across distributed sensor arrays in seismology and energy exploration deployments. |
Applications
| Seismology Sensor Front-End | Energy Exploration Data Acquisition |
|---|---|
Use Scenario: High-resolution digitization of low-frequency (<100Hz) ground motion signals from geophone arrays deployed in boreholes or surface grids. IC Role / Device Role / Timing Role: Primary ADC capturing microvolt-level differential seismic transients with ultra-low noise floor and zero-latency common-mode monitoring for sensor health diagnostics. Use Value: 145dB dynamic range at 61sps resolves sub-nanovolt signals buried in thermal noise; dual outputs allow real-time anomaly detection (via SDOB) and offline spectral analysis (via SDOA). |
Use Scenario: Multi-channel acquisition in downhole logging tools measuring resistivity, gamma-ray, and acoustic waveforms under extreme temperature and vibration. IC Role / Device Role / Timing Role: Precision ADC providing calibrated voltage readings from high-impedance sensors while rejecting common-mode interference from motor drives and telemetry circuits. Use Value: 0V–VREF common-mode range accommodates varying sensor bias points; ±0.5ppm INL ensures traceable accuracy for regulatory compliance in oilfield data reporting. |
| Automated Test Equipment (ATE) | High-Accuracy Instrumentation |
Use Scenario: Calibration-grade source-measure units verifying DMMs, calibrators, and sensor simulators with ppm-level linearity requirements. IC Role / Device Role / Timing Role: Metrology ADC generating reference-quality digitized feedback for closed-loop voltage/current control loops with deterministic latency. Use Value: Guaranteed 32-bit no-missing-codes operation eliminates interpolation errors; 24mW power at 1Msps enables dense channel packing without thermal derating. |
Use Scenario: Laboratory-grade digital multimeters and impedance analyzers requiring DC stability, low drift, and high-resolution DC voltage measurement. IC Role / Device Role / Timing Role: Core ADC delivering validated 32-bit readings with <1ppm total error budget, including INL, offset, and gain drift over temperature. Use Value: Zero-scale error drift ≤ ±14ppb/°C and full-scale error drift ≤ ±0.05ppm/°C ensure long-term calibration stability without frequent recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606C-18 | 18-bit, 1-MSPS, integrated analog front-end (PGA, anti-aliasing filter, reference); no configurable digital filter; lower dynamic range (104dB) | Targets mid-precision industrial DAQ where integrated signal conditioning outweighs resolution needs | Select when system-level integration (on-chip PGA, simultaneous sampling) is prioritized over ultimate DC precision and noise floor. |
| ADS1282IPWR | 31-bit delta-sigma ADC; 4kSPS max; built-in PGA and digital filter; higher power (33mW); no no-latency output mode | Focused on low-frequency (<10Hz) geophysical logging with integrated PGA and sensor excitation | Select when ultra-low-frequency noise performance (<100nV p-p) and on-chip sensor biasing are required, and real-time differential+common-mode output is not needed. |
Compared with AD7606C-18 and ADS1282IPWR, the LTC2508CDKD-32#PBF uniquely delivers 32-bit no-missing-codes resolution with simultaneous zero-latency composite output and pin-configurable digital filtering - making it the only option for applications demanding both metrology-grade DC accuracy and real-time signal fidelity at 1Msps.
Availability
LTC2508CDKD-32#PBF is available at Aetrix Electronics and suitable for seismic instrumentation, energy exploration data acquisition, and automated test equipment requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across 0°C to 70°C.
Supply support for LTC2508CDKD-32#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and healthcare markets.
The LTC2508-32 product line was designed specifically for ultra-high-precision DC-coupled measurement systems where resolution, linearity, and noise floor are paramount - targeting geophysical sensing, metrology, and calibration-grade instrumentation.
FAQ
What is the guaranteed operating temperature range for the LTC2508CDKD-32#PBF?
The LTC2508CDKD-32#PBF is specified for operation from 0°C to 70°C. This commercial-grade temperature range is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics sections of the official datasheet, with all min/typ/max parameters explicitly denoted for full-range operation using the "l" symbol.
Does the LTC2508CDKD-32#PBF support true bipolar input signals?
Yes, the LTC2508CDKD-32#PBF supports true bipolar inputs through its fully differential architecture: the IN+/IN– pins accept a differential voltage range of –VREF to +VREF while maintaining a common-mode range of 0V to VREF. This allows direct connection of bipolar sensor outputs (e.g., ±2.5V) without external level-shifting circuitry.
How does the digital filter in the LTC2508CDKD-32#PBF affect anti-aliasing requirements?
The LTC2508CDKD-32#PBF's configurable digital lowpass filter relaxes analog anti-aliasing requirements by providing sharp roll-off beyond the effective Nyquist frequency defined by the selected down-sampling factor. For example, at DF=16384 (61sps output), the digital filter attenuates out-of-band noise above ~30Hz, allowing simpler RC filters instead of high-order active designs.
Can the LTC2508CDKD-32#PBF provide both filtered and unfiltered outputs simultaneously?
Yes - the LTC2508CDKD-32#PBF delivers two independent outputs: a 32-bit digitally filtered low-noise code on SDOA and a 22-bit no-latency composite code (14-bit differential + 8-bit common mode) on SDOB. Both outputs are updated every conversion cycle (1Msps), enabling real-time monitoring and high-precision post-processing from the same sampling event.
What is the significance of the exposed thermal pad (Pin 25) on the LTC2508CDKD-32#PBF package?
The exposed pad (Pin 25) is internally connected to GND and must be soldered to the PCB ground plane. It provides critical thermal dissipation (θJA = 40°C/W) and a low-inductance ground return path for the analog core, directly contributing to the LTC2508CDKD-32#PBF's 145dB dynamic range and ±0.5ppm INL performance by minimizing ground bounce and thermal gradients.
LTC2508CDKD-32#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 32
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 1
- Input Type:
- Differential, Pseudo-Differential
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.375V ~ 2.625V
- Voltage - Supply, Digital:
- 2.375V ~ 2.625V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-DFN (7x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2508CDKD-32#PBF FAQ
1.How can I place an order for LTC2508CDKD-32#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2508CDKD-32#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 LTC2508CDKD-32#PBF reliable?
The price and inventory of LTC2508CDKD-32#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2508CDKD-32#PBF is usually 5 days.
3.What payment methods are accepted for LTC2508CDKD-32#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2508CDKD-32#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2508CDKD-32#PBF?
LTC2508CDKD-32#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2508CDKD-32#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 LTC2508CDKD-32#PBF?
For technical support, including LTC2508CDKD-32#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2508CDKD-32#PBF requirements.
6.How does Aetrix verify that LTC2508CDKD-32#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2508CDKD-32#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 LTC2508CDKD-32#PBF meets industry standards.
7.What is the process for return or replacement of LTC2508CDKD-32#PBF?
All LTC2508CDKD-32#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2508CDKD-32#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 LTC2508CDKD-32#PBF part is unused and in its original packaging.
Return procedure for LTC2508CDKD-32#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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