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Analog Devices Inc. LTC2508CDKD-32#TRPBF
- Part No.:
- LTC2508CDKD-32#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-WFDFN Exposed Pad
- Datasheet:
-
LTC2508CDKD-32#TRPBF.pdf
- Description:
- IC ADC 32BIT SAR 24DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,142
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Product details
Overview
LTC2508CDKD-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 dual outputs: a 32-bit low-noise filtered code (145dB DR at 61sps) and a 22-bit no-latency composite code (14-bit differential + 8-bit common mode), enabling high-precision DC and dynamic measurements in seismic instrumentation and energy exploration systems.
For engineers reviewing the LTC2508CDKD-32#TRPBF datasheet, LTC2508CDKD-32#TRPBF pinout, LTC2508CDKD-32#TRPBF application, or LTC2508CDKD-32#TRPBF equivalent, key selection criteria include guaranteed 32-bit no-missing-codes performance, ±0.5ppm INL, 1.8V–5V SPI-compatible serial I/O, 24-Lead DFN package, and pin-strappable down-sampling factors (256–16384) for dynamic range optimization across sampling rates from 61sps to 1Msps.
Technical Context
The LTC2508CDKD-32#TRPBF implements a 32-bit SAR 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), each with independent clocking (SCKA/SCKB) and enable control (RDLA/RDLB).
Pin-strapped SEL0/SEL1 inputs select one of four down-sampling factors (256, 1024, 4096, 16384), directly determining output data rate (3.9ksps–61sps) and dynamic range (131–145dB). Synchronization via SYNC pin enables precise phase alignment across multiple devices for coherent multi-channel acquisition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 32-bit filtered output; 14-bit differential + 8-bit common mode no-latency output |
| Dynamic Range | 145dB typical at 61sps (DF=16384), 131dB at 3.9ksps (DF=256) |
| INL Error | ±0.5ppm typical (±3.5ppm max), enabling sub-ppm precision metrology |
| Sampling Rate | 1Msps maximum; filtered output data rate selectable from 61sps to 3.9ksps |
| Reference Range | 2.5V to 5.1V, supporting LSB size as fine as 2.3nV (at 5V ref) |
| Power Consumption | 24mW at 1Msps, 15µW in power-down mode |
| Input Common Mode | 0V to VREF, simplifying signal conditioning for unipolar, bipolar, and pseudo-differential inputs |
Pinout & Package
Package: 24-Lead 7mm × 4mm plastic DFN (DKD) with exposed thermal pad (Pin 25 = GND, must be soldered to PCB ground plane).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RDLA (1) | Filtered Output Enable | Active-low control for SDOA; places SDOA in high-Z when high |
| RDLB (2) | No-Latency Output Enable | Active-low control for SDOB; places SDOB in high-Z when high |
| VDD (3) | Analog Core Supply | 2.375V–2.625V supply for SAR ADC and digital filter logic |
| IN+ / IN– (5/6) | Differential Analog Inputs | Accept ±VREF differential voltage with 0V–VREF common mode range |
| REF (8–10) | Reference Input | 2.5V–5.1V reference; requires 47µF X7R ceramic decoupling |
| SEL0 / SEL1 (11/12) | Down-Sampling Factor Select | Pin-strapped binary inputs selecting DF = 256, 1024, 4096, or 16384 |
| MCLK (13) | Master Clock Input | Rising edge initiates conversion and powers up internal circuitry |
| SYNC (14) | Synchronization Input | Edge-triggered signal aligning digital filter phase across multiple devices |
| DRL (15) | Data Ready Low | Falling edge indicates new filtered output code ready in SDOA register |
| SDOA (17) | Filtered Serial Data Output | 32-bit 2's complement MSB-first output synchronized to SCKA |
| SCKA / SCKB (18/19) | Serial Clock Inputs | Independent clocks for filtered (SDOA) and no-latency (SDOB) data streams |
| SDOB (20) | No-Latency Serial Data Output | 22-bit composite (14+8) 2's complement MSB-first output synchronized to SCKB |
| BUSY (21) | Conversion Status Indicator | High during conversion; low when result is latched and ready |
| OVDD (22) | I/O Interface Supply | 1.71V–5.25V digital interface supply, sets logic thresholds for all I/O pins |
Key Features
| Feature | Design Value |
|---|---|
| Dual simultaneous outputs | 32-bit filtered low-noise code + 22-bit no-latency composite code (14-bit diff + 8-bit CM) per conversion cycle |
| Configurable digital filter | Four pin-selectable down-sampling factors (256–16384) enabling trade-off between DR (145dB) and data rate (61sps–3.9ksps) |
| Relaxed anti-aliasing | Digital lowpass filtering reduces analog front-end complexity and component count in high-DR systems |
| Wide input common mode | 0V to VREF range supports arbitrary unipolar/bipolar/pseudo-differential signals without external level-shifting |
| Multi-device synchronization | Synchronous operation of multiple LTC2508CDKD-32#TRPBF units via shared SYNC signal for coherent sampling |
Applications
| Seismology Data Acquisition | Energy Exploration Sensors |
|---|---|
Use Scenario: High-resolution digitization of low-frequency geophone and hydrophone signals in borehole and surface arrays. IC Role / Device Role / Timing Role: Primary 32-bit ADC capturing microvolt-level earth motion signals with ultra-low noise floor and guaranteed monotonicity. Use Value: 145dB dynamic range at 61sps enables detection of weak seismic reflections buried in thermal and environmental noise. | Use Scenario: Precision measurement of resistivity, acoustic impedance, and electromagnetic field gradients in downhole logging tools. IC Role / Device Role / Timing Role: High-stability SAR ADC providing calibrated differential voltage and common-mode monitoring for sensor excitation feedback loops. Use Value: ±0.5ppm INL and 0–85°C guaranteed operation ensure traceable accuracy across harsh temperature gradients in oil/gas wells. |
| Automated Test Equipment (ATE) | High-Accuracy Metrology Instruments |
Use Scenario: DC parametric testing of precision components (resistors, references, amplifiers) requiring ppm-level linearity verification. IC Role / Device Role / Timing Role: Reference-grade ADC serving as calibration engine in automated test handlers and benchtop source-measure units. Use Value: Guaranteed 32-bit no-missing-codes and 24mW power at 1Msps support fast, repeatable, low-drift measurements without interpolation artifacts. | Use Scenario: Digital multimeters, calibration standards, and quantum voltage standard readout systems demanding long-term stability and traceability. IC Role / Device Role / Timing Role: Primary digitizer in metrology-grade instruments where absolute accuracy, low drift, and low noise define measurement uncertainty budgets. Use Value: Zero-scale error drift of ±14ppb/°C and full-scale error drift of ±0.05ppm/°C minimize temperature-induced calibration drift over extended operational periods. |
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 |
|---|---|---|---|
| ADS1287IRHBT | 24-bit delta-sigma ADC; 128ksps max; 130dB DR at 1ksps; integrated PGA and oscillator | Lower resolution and DR than LTC2508CDKD-32#TRPBF; suited for medium-speed, lower-precision industrial sensing | Select ADS1287IRHBT when system requires on-chip PGA, lower cost, and 24-bit resolution suffices |
| AD7768-1ACPZ | 24-bit sigma-delta ADC; 256ksps; 119dB DR at 256ksps; integrated buffer and reference | Higher speed but lower DR and resolution; optimized for audio and vibration analysis, not ultra-high-precision DC | Select AD7768-1ACPZ when wide bandwidth and integrated analog front-end reduce BOM count in mid-DR applications |
Compared with ADS1287IRHBT and AD7768-1ACPZ, the LTC2508CDKD-32#TRPBF uniquely delivers true 32-bit resolution with no missing codes, 145dB DR, and dual-output architecture-making it irreplaceable for applications requiring both ultra-high DC precision and real-time composite monitoring without latency penalties.
Availability
LTC2508CDKD-32#TRPBF is available at Aetrix Electronics and suitable for seismology data acquisition, energy exploration sensors, and automated test equipment requiring stable component supply, long-term lifecycle support, and guaranteed 0°C to 70°C industrial temperature grade operation.
Supply support for LTC2508CDKD-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets.
The LTC2508CDKD-32#TRPBF belongs to the Linear Technology precision ADC product line, designed specifically for applications demanding ultra-low noise, high linearity, and deterministic timing in geophysical, metrology, and test equipment systems.
FAQ
What is the guaranteed operating temperature range for the LTC2508CDKD-32#TRPBF?
The LTC2508CDKD-32#TRPBF is specified for 0°C to 70°C operation (C-grade). This is confirmed by the order information table listing "0°C to 70°C" under Temperature Range for part number LTC2508CDKD-32#TRPBF. The I-grade variant (LTC2508IDKD-32#TRPBF) extends to –40°C to 85°C, but the C-grade LTC2508CDKD-32#TRPBF does not guarantee operation outside 0°C–70°C.
Does the LTC2508CDKD-32#TRPBF support true 32-bit resolution with no missing codes across its full operating range?
Yes, the LTC2508CDKD-32#TRPBF guarantees 32-bit resolution with no missing codes over its full operating temperature range (0°C to 70°C), as explicitly stated in the Electrical Characteristics table under "No Missing Codes" with "l" symbol denoting full-temperature-range specification. This ensures monotonic transfer function and absence of code gaps even at temperature extremes.
How is the down-sampling factor configured on the LTC2508CDKD-32#TRPBF?
The down-sampling factor on the LTC2508CDKD-32#TRPBF is configured using pin-strapped SEL0 (Pin 11) and SEL1 (Pin 12): 00 selects DF=256, 01 selects DF=1024, 10 selects DF=4096, and 11 selects DF=16384. These static logic levels set the digital filter's decimation ratio at power-up and remain fixed until reset or power cycle-no SPI command required.
What are the voltage requirements for the VDD and OVDD supplies of the LTC2508CDKD-32#TRPBF?
VDD must be 2.375V to 2.625V (nominal 2.5V) for the analog core and digital filter. OVDD must be 1.71V to 5.25V (supporting 1.8V, 2.5V, 3.3V, or 5V logic) and defines logic thresholds for all digital I/O pins (RDLA, RDLB, SCKA, SCKB, etc.). Both supplies require local ceramic decoupling: 10µF for VDD and 0.1µF for OVDD.
Can the LTC2508CDKD-32#TRPBF simultaneously output filtered and no-latency data streams?
Yes, the LTC2508CDKD-32#TRPBF simultaneously provides two independent data streams: a 32-bit digitally filtered output on SDOA (with latency dependent on down-sampling factor) and a 22-bit no-latency composite output on SDOB (14-bit differential + 8-bit common mode), available every conversion cycle (1Msps) with zero-cycle latency. Each stream uses separate enable (RDLA/RDLB) and clock (SCKA/SCKB) signals.
LTC2508CDKD-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:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-DFN (7x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2508CDKD-32#TRPBF FAQ
1.How can I place an order for LTC2508CDKD-32#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2508CDKD-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 LTC2508CDKD-32#TRPBF reliable?
The price and inventory of LTC2508CDKD-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 LTC2508CDKD-32#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2508CDKD-32#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2508CDKD-32#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2508CDKD-32#TRPBF?
LTC2508CDKD-32#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2508CDKD-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 LTC2508CDKD-32#TRPBF?
For technical support, including LTC2508CDKD-32#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2508CDKD-32#TRPBF requirements.
6.How does Aetrix verify that LTC2508CDKD-32#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2508CDKD-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 LTC2508CDKD-32#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2508CDKD-32#TRPBF?
All LTC2508CDKD-32#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2508CDKD-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 LTC2508CDKD-32#TRPBF part is unused and in its original packaging.
Return procedure for LTC2508CDKD-32#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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