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Analog Devices Inc. LTC2508IDKD-32#TRPBF
- Part No.:
- LTC2508IDKD-32#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-WFDFN Exposed Pad
- Datasheet:
-
LTC2508IDKD-32#TRPBF.pdf
- Description:
- IC ADC 32BIT SAR 24DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,126
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Product details
Overview
LTC2508IDKD-32#TRPBF 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 supporting ±VREF differential input range up to 5.1V reference. It delivers 145dB dynamic range at 61sps, ±0.5ppm typical INL, and guaranteed 32-bit no-missing-codes performance for ultra-high-precision DC and low-frequency measurements in seismic instrumentation and energy exploration systems.
For engineers reviewing the LTC2508IDKD-32#TRPBF datasheet, LTC2508IDKD-32#TRPBF pinout, LTC2508IDKD-32#TRPBF application, or LTC2508IDKD-32#TRPBF equivalent, key selection criteria include its dual-output architecture (32-bit filtered + 22-bit no-latency), pin-strapped down-sampling factor selection (256–16384), wide 0V–VREF common-mode input range, SPI-compatible 1.8V–5V I/O, and operation across –40°C to +85°C industrial temperature range.
Technical Context
The LTC2508IDKD-32#TRPBF implements a 32-bit SAR ADC core with charge redistribution DAC, followed by a programmable digital lowpass filter that performs decimation and noise shaping. Its dual-output architecture separates high-precision filtered data (SDOA) from real-time composite data (SDOB: 14-bit differential + 8-bit common mode), enabling simultaneous high-resolution measurement and fast control-loop feedback.
Filter configuration is set via SEL0/SEL1 pins, selecting down-sampling factors of 256, 1024, 4096, or 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 conditioning is simplified by 0V–VREF common-mode range and 128dB CMRR 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 simultaneous precision metrology and real-time monitoring. |
| Dynamic Range | 145dB typical at 61sps (DF=16384) - supports sub-nanovolt-level signal resolution in low-noise instrumentation. |
| INL Error | ±0.5ppm typical (±3.5ppm max) - ensures <1 LSB error over full scale with 5V reference (LSB = 2.3nV). |
| Input Range | Fully differential ±VREF (VREF = 2.5V–5.1V); common-mode 0V–VREF - eliminates need for level-shifting circuitry in bipolar/unipolar signal chains. |
| Power Consumption | 24mW at 1Msps sampling - achieves ultra-low power per bit for battery-operated or thermally constrained systems. |
| Digital Interface | SPI-compatible dual serial ports (SDOA/SCKA and SDOB/SCKB) with 1.8V–5V OVDD - interoperates with diverse host controllers without level shifters. |
| Operating Temp | –40°C to +85°C - qualified for industrial, oilfield, and outdoor embedded instrumentation environments. |
Pinout & Package
24-lead 7mm × 4mm plastic DFN package (DKD) with exposed thermal pad (Pin 25 = GND, must be soldered to PCB ground plane). Pin count and layout match industry-standard 24-lead DFN footprint for mechanical compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RDLA (1) | Filtered Output Read Enable | Active-low enable for SDOA; controls high-impedance state of 32-bit filtered data bus - allows multi-device SPI sharing. |
| RDLB (2) | No-Latency Output Read Enable | Active-low enable for SDOB; isolates 22-bit composite output (14b diff + 8b CM) - supports independent timing control of two data streams. |
| VDD (3) | Analog Core Supply | 2.375V–2.625V supply for SAR core and internal references - requires local 10µF ceramic bypass to GND. |
| IN+ / IN– (5,6) | Differential Analog Inputs | High-impedance inputs with 45pF sampling capacitance and 40Ω switch resistance - accept arbitrary unipolar/bipolar signals within 0V–VREF common-mode window. |
| REF (8–10) | Reference Input | 2.5V–5.1V external reference; three parallel pins reduce impedance and improve noise immunity - requires 47µF X7R ceramic decoupling. |
| SEL0/SEL1 (11,12) | Down-Sampling Factor Select | Binary-coded pins selecting DF=256/1024/4096/16384 - sets filter bandwidth, output rate, and dynamic range without software overhead. |
| MCLK (13) | Master Clock Input | Rising-edge-triggered conversion start and power-up signal - initiates acquisition phase of SAR cycle. |
| SYNC (14) | Filter Synchronization | Edge-triggered input aligning digital filter phases across multiple LTC2508 devices - essential for coherent multi-channel sampling. |
| DRL (15) | Data Ready Low | Open-drain output asserting low when new 32-bit filtered code is valid in SDOA register - replaces polling BUSY for deterministic timing. |
| SDOA / SCKA (17,18) | Filtered Output Data/Clock | MSB-first 2's complement serial interface for 32-bit filtered data - clocked by SCKA (up to 100MHz), enabled by RDLA. |
| SDOB / SCKB (20,19) | No-Latency Output Data/Clock | MSB-first 2's complement serial interface for 22-bit composite output - available every conversion cycle (1Msps), zero-cycle latency. |
| BUSY (21) | Conversion Status Indicator | Active-high open-drain signal indicating active conversion - transitions high on MCLK rise, low after tCONV (~652ns max). |
| OVDD (22) | Digital I/O Supply | 1.71V–5.25V supply for all digital pins (RDLx, SCKx, SDOx, SYNC, etc.) - enables direct interfacing with 1.8V/2.5V/3.3V/5V logic. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent output streams | 32-bit digitally filtered output (SDOA) and 22-bit no-latency composite output (SDOB) operate concurrently - enables closed-loop control and high-accuracy logging in same system. |
| Configurable digital filter | Four pin-selectable down-sampling factors (256–16384) trade off output rate (3.9ksps–61sps) vs. dynamic range (131–145dB) - eliminates need for external DSP or FPGA filtering. |
| 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 amplification. |
| Relaxed anti-aliasing requirements | Digital lowpass filter reduces aliasing sensitivity - allows simpler, lower-order analog anti-aliasing filters (e.g., single-pole RC) instead of steep 8th-order active filters. |
| Multi-device synchronization | Synchronous digital filter operation across multiple LTC2508 units via shared SYNC signal - ensures phase-aligned sampling for coherent multi-channel acquisition. |
Applications
| Seismology Data Acquisition | Energy Exploration Sensors |
|---|---|
Use Scenario: High-fidelity recording of microseismic events (<1µV amplitude) in borehole arrays using geophone or MEMS accelerometers. IC Role / Device Role / Timing Role: Primary digitizer capturing ultra-low-noise analog outputs with 145dB DR and ±0.5ppm INL for sub-Hz spectral analysis. Use Value: Enables detection of weak subsurface reflections previously masked by quantization noise, improving reservoir characterization accuracy. |
Use Scenario: Downhole logging tools measuring resistivity, gamma ray, and acoustic waveforms under extreme temperature and vibration. IC Role / Device Role / Timing Role: Precision ADC front-end converting sensor outputs with guaranteed operation to +85°C and robust EMI immunity. Use Value: Eliminates calibration drift over temperature cycles and maintains 32-bit linearity in harsh oilfield environments. |
| Automated Test Equipment (ATE) | High-Accuracy Metrology Instruments |
Use Scenario: Calibration-grade source-measure units verifying DMMs and calibrators with ppm-level traceability. IC Role / Device Role / Timing Role: Reference-grade digitizer providing 32-bit no-missing-codes and 131dB DR at 4ksps for DC voltage/current metrology. Use Value: Reduces system-level uncertainty by minimizing integral nonlinearity contribution (<0.5ppm) in primary standards equipment. |
Use Scenario: Portable calibration analyzers performing field verification of pressure transducers, strain gauges, and thermocouple simulators. IC Role / Device Role / Timing Role: Dual-output ADC supplying real-time 22-bit feedback for closed-loop excitation control while logging 32-bit precision results. Use Value: Cuts test time by 40% through concurrent measurement and control - no software latency between sensing and actuation. |
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 |
|---|---|---|---|
| AD7616BSTZ | 16-bit, dual 1MSPS SAR with integrated analog front-end (PGA, antialiasing filter); no configurable digital filter; 87dB DR max. | Targeted at high-speed multiplexed data acquisition, not ultra-high-resolution DC metrology. | Select when system requires on-chip PGA and simultaneous sampling of 16 channels, not 32-bit resolution. |
| ADS1287IRHBT | 31-bit delta-sigma ADC; 2.5kSPS max; 130dB DR at 10SPS; SPI interface; 32-pin QFN package. | Optimized for low-power portable instrumentation; lacks no-latency output and pin-strapped filter configuration. | Select when ultra-low power (<10mW) and smaller package are critical, and 22-bit real-time output is unnecessary. |
Compared with AD7616BSTZ and ADS1287IRHBT, the LTC2508IDKD-32#TRPBF uniquely combines 32-bit resolution, pin-configurable digital filtering, and dual-output architecture - making it the only option capable of delivering both 145dB dynamic range and 1Msps no-latency feedback in a single IC for seismic and metrology applications.
Availability
LTC2508IDKD-32#TRPBF is available at Aetrix Electronics and suitable for seismology data acquisition, energy exploration sensors, automated test equipment (ATE), and high-accuracy instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2508IDKD-32#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2508IDKD-32#TRPBF belongs to Analog Devices' precision ADC product line, designed specifically for applications demanding ultra-low noise, exceptional linearity, and flexible digital filtering - including geophysical sensing, metrology, and scientific instrumentation.
FAQ
What is the maximum sampling rate of the LTC2508IDKD-32#TRPBF?
The LTC2508IDKD-32#TRPBF supports a maximum sampling frequency of 1Msps. At this rate, the no-latency 22-bit output (SDOB) is available every conversion cycle, while the 32-bit filtered output (SDOA) operates at reduced data rates (e.g., 3.9ksps at DF=256) determined by the selected down-sampling factor. The SAR core completes each conversion in ≤652ns.
How does the digital filter configuration affect dynamic range and output data rate in the LTC2508IDKD-32#TRPBF?
In the LTC2508IDKD-32#TRPBF, the digital filter's down-sampling factor (set by SEL0/SEL1 pins) directly determines both dynamic range and output data rate: DF=256 yields 131dB DR at 3.9ksps; DF=1024 gives 136dB at ~975sps; DF=4096 provides 141dB at ~244sps; DF=16384 achieves 145dB at 61sps. Higher DF increases noise shaping effectiveness but reduces output throughput.
What is the purpose of the dual serial output interfaces (SDOA/SCKA and SDOB/SCKB) on the LTC2508IDKD-32#TRPBF?
The LTC2508IDKD-32#TRPBF uses separate serial interfaces to isolate its two distinct data streams: SDOA/SCKA carries the 32-bit digitally filtered, high-precision output (with latency), while SDOB/SCKB delivers the 22-bit no-latency composite output (14-bit differential + 8-bit common mode) every 1µs. This physical separation prevents timing conflicts and allows independent clocking and readout scheduling for control and measurement tasks.
Can the LTC2508IDKD-32#TRPBF operate with a 3.3V I/O supply while using a 2.5V analog supply?
Yes. The LTC2508IDKD-32#TRPBF supports independent supplies: VDD = 2.5V (±62.5mV) powers the analog SAR core and reference circuitry, while OVDD = 1.71V–5.25V powers all digital I/O pins (RDLA/RDLB, SCKA/SCKB, SDOA/SDOB, SYNC, etc.). A 3.3V OVDD is fully compliant and enables direct connection to 3.3V microcontrollers without level-shifting components.
What is the significance of the wide 0V to VREF common-mode input range in the LTC2508IDKD-32#TRPBF?
The 0V to VREF common-mode input range in the LTC2508IDKD-32#TRPBF eliminates the need for external biasing networks or rail-to-rail input amplifiers. It allows direct interfacing with sensors producing arbitrary unipolar (0–VREF), pseudo-differential (VCM-centered), or true bipolar (±VREF/2) signals - simplifying analog front-end design and reducing component count, cost, and potential error sources in precision measurement systems.
LTC2508IDKD-32#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-DFN (7x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2508IDKD-32#TRPBF FAQ
1.How can I place an order for LTC2508IDKD-32#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2508IDKD-32#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 LTC2508IDKD-32#TRPBF reliable?
The price and inventory of LTC2508IDKD-32#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2508IDKD-32#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2508IDKD-32#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2508IDKD-32#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2508IDKD-32#TRPBF?
LTC2508IDKD-32#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2508IDKD-32#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 LTC2508IDKD-32#TRPBF?
For technical support, including LTC2508IDKD-32#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2508IDKD-32#TRPBF requirements.
6.How does Aetrix verify that LTC2508IDKD-32#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2508IDKD-32#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 LTC2508IDKD-32#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2508IDKD-32#TRPBF?
All LTC2508IDKD-32#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2508IDKD-32#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 LTC2508IDKD-32#TRPBF part is unused and in its original packaging.
Return procedure for LTC2508IDKD-32#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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