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Analog Devices Inc. LTC2500CDKD-32#PBF
- Part No.:
- LTC2500CDKD-32#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-WFDFN Exposed Pad
- Datasheet:
-
LTC2500CDKD-32#PBF.pdf
- Description:
- IC ADC 32BIT SAR 24DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,247
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Product details
Overview
LTC2500CDKD-32#PBF from Analog Devices (formerly Linear Technology) 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. It delivers dual simultaneous outputs: a 32-bit digitally filtered low-noise code (SDOA) and a 32-bit no-latency composite code (SDOB) comprising 24-bit differential + 7-bit common-mode data with overrange detection. It is designed for ultra-high-precision DC and low-frequency measurement in seismic instrumentation and energy exploration systems.
For engineers reviewing the LTC2500CDKD-32#PBF datasheet, LTC2500CDKD-32#PBF pinout, LTC2500CDKD-32#PBF application, or LTC2500CDKD-32#PBF equivalent, key selection criteria include guaranteed 32-bit no-missing-codes performance, ±0.5 ppm typical INL, 148 dB dynamic range at 61 sps, 104 dB SNR at 1 Msps, and support for synchronized multi-device operation via SYNC pin.
Technical Context
The LTC2500CDKD-32#PBF integrates a high-resolution SAR ADC core with a programmable wideband digital lowpass filter that supports multiple decimation filter types (SINC1–SINC4, SSINC, flat passband) and down-sampling factors from 4 to 16384. Its dual-output architecture separates precision measurement (filtered SDOA path) from real-time monitoring (no-latency SDOB path), enabling concurrent high-accuracy acquisition and fast system response.
It features fully differential analog inputs with 0 V to VREF common-mode range (VREF = 2.5 V to 5.1 V), 1.8 V to 5 V SPI-compatible serial I/O powered by OVDD, and synchronization capability across multiple devices using the dedicated SYNC input. The device operates over 0°C to 70°C and is specified with guaranteed 32-bit monotonicity and ±0.5 ppm INL across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 32-bit filtered output (SDOA); 24-bit differential + 7-bit common-mode no-latency output (SDOB) |
| INL | ±0.5 ppm typical - ensures sub-ppm linearity critical for metrology-grade calibration |
| Dynamic Range | 148 dB typical at 61 sps - enables resolution of 48-bit effective noise-free code under ultra-low-speed conditions |
| SNR | 104 dB typical at 1 Msps - supports high-fidelity signal capture up to Nyquist frequency without external oversampling |
| Power Consumption | 24 mW at 1 Msps - achieves ultra-low power per bit for battery- or energy-harvesting–constrained systems |
| Digital Interface | SPI-compatible dual-port: SCKA/SDOA/RDLA for filtered data; SCKB/SDOB/RDLB for no-latency data |
| Reference Range | 2.5 V to 5.1 V - allows flexible scaling from low-voltage sensor interfaces to full industrial ±5 V ranges |
Pinout & Package
Package: 24-lead (7 mm × 4 mm) plastic DFN (DKD) with exposed thermal pad (Pin 25 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RDLA (1) | Filtered Output Enable | Active-low control for SDOA bus; enables MSB-first 32-bit filtered data transfer synchronized to SCKA |
| RDLB (2) | No-Latency Output Enable | Active-low control for SDOB bus; enables immediate 32-bit composite output (24+7+1) each conversion cycle |
| VDD (3) | Analog Core Supply | 2.5 V ±62.5 mV supply for SAR ADC and internal reference circuitry; requires 10 µF ceramic bypass |
| IN+ / IN– (5,6) | Differential Analog Inputs | Support ±VREF full-scale range with 0 V to VREF common-mode; tolerate input transients per internal clamp diodes |
| REF (8,9) | Reference Input | 2.5 V–5.1 V external reference; dual pins reduce impedance and improve PSRR; requires 47 µF X7R decoupling |
| PRE (10) | Filter Configuration Mode Select | High = preset filter modes; Low = full 16-bit configuration word entry via SDI/SCKA for custom decimation |
| MCLK (13) | Master Conversion Clock | Rising edge initiates new conversion cycle; also powers up device from standby; timing-critical for jitter-sensitive apps |
| SYNC (14) | Multi-Device Synchronization | Pulse aligns digital filter phase across multiple LTC2500-32 units-essential for coherent array measurements |
| DRL (15) | Filtered Data Ready Indicator | Falling edge signals valid 32-bit filtered code ready in SDOA register; used for interrupt-driven host readout |
| SDI (16) | Digital Filter Programming Input | Serial interface for writing 16-bit configuration words (filter type, DF, DGC/DGE settings) when PRE = low |
| SDOA (17) | Filtered Output Data | 32-bit two's complement output (MSB first); latency depends on DF (e.g., 4 cycles for DF=4, ~16k cycles for DF=16384) |
| SCKA (18) | Filtered Output Clock | Drives SDOA data shift-out; supports up to 100 MHz clock rate (10 ns period); logic referenced to OVDD |
| SCKB (19) | No-Latency Output Clock | Drives SDOB data shift-out at 1 Msps; independent timing domain from SCKA; enables asynchronous dual-readout |
| SDOB (20) | No-Latency Composite Output | 32-bit word: Bit 31 = overrange flag; Bits 30–7 = 24-bit differential; Bits 6–0 = 7-bit common-mode voltage |
| BUSY (21) | Conversion Status Flag | High during conversion; falling edge indicates completion and availability of both SDOA and SDOB data |
| OVDD (22) | I/O Interface Supply | 1.71 V–5.25 V digital supply for all SPI interface pins; sets logic thresholds for RDLA/RDLB/SCKA/SCKB/SDI/SDOA/SDOB/BUSY |
| GND (4,7,11,12,23,24,25) | Ground Terminals | Seven dedicated GND connections-including exposed thermal pad (Pin 25)-minimize ground bounce and thermal resistance |
Key Features
| Feature | Design Value |
|---|---|
| Dual Simultaneous Outputs | Enables real-time system monitoring (SDOB) while performing high-precision post-processing (SDOA) without pipeline stalls |
| Configurable Digital Filter | Eight selectable filter types (SINC1–SINC4, SSINC, flat passband) and 14 down-sampling ratios (4–16384) optimize noise vs. latency trade-offs |
| Relaxed Anti-Aliasing Requirements | On-chip digital filtering reduces analog anti-aliasing filter complexity-enabling simple RC front-ends instead of active multi-pole designs |
| Multi-Device Synchronization | Synchronous sampling across multiple LTC2500-32 units via shared SYNC pulse-critical for phased-array seismometers and distributed sensing |
| Wide Common-Mode Input Range | 0 V to VREF simplifies interfacing with unbuffered sensors, current shunts, and industrial transducers without level-shifting circuitry |
Applications
| Seismology Instrumentation | Energy Exploration Sensors |
|---|---|
|
Use Scenario: High-resolution broadband seismic arrays deployed in boreholes or surface grids for microseismic event detection and subsurface imaging. IC Role / Device Role / Timing Role: Primary digitizer for geophone and accelerometer signals; provides synchronized 32-bit samples across distributed nodes. Use Value: 148 dB dynamic range at 61 sps resolves sub-nanovolt ground motion; SYNC pin enables <100 ps inter-channel skew across 100+ node networks. |
Use Scenario: Downhole logging tools measuring resistivity, gamma-ray, and acoustic waveforms in oil/gas wellbores under extreme temperature and vibration. IC Role / Device Role / Timing Role: Precision ADC for analog sensor front-ends; operates reliably from 0°C to 70°C with guaranteed 32-bit monotonicity. Use Value: ±0.5 ppm INL ensures calibrated accuracy over full temperature range; dual outputs allow real-time anomaly detection (SDOB) and offline spectral analysis (SDOA). |
| Automatic Test Equipment (ATE) | High-Accuracy Metrology Systems |
|
Use Scenario: Modular ATE platforms requiring reconfigurable high-resolution digitizers for parametric testing of precision analog ICs and RF components. IC Role / Device Role / Timing Role: Calibration-grade measurement engine; SPI-configurable filter modes adapt to test signal bandwidth and required settling time. Use Value: 104 dB SNR at 1 Msps supports fast characterization of low-noise amplifiers; no-missing-codes guarantee eliminates histogram distortion in statistical yield analysis. |
Use Scenario: Primary ADC in portable calibrators, quantum sensor readouts, and national lab reference standards where traceable uncertainty below 1 ppm is mandatory. IC Role / Device Role / Timing Role: Metrological-grade digitizer with validated linearity and drift specs; used with external ovenized references and guarded layouts. Use Value: Zero-scale error drift ≤ ±7 ppb/°C and full-scale drift ≤ ±0.05 ppm/°C enable stable 24-hour calibration runs without recalibration; 32-bit resolution exceeds NIST Class A requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1287IRHBT | 24-bit delta-sigma ADC; 128 dB DR at 10 sps; single-output; no SYNC pin; lower power (12 mW) | Optimized for ultra-low-power static measurements-not suitable for simultaneous real-time + precision dual-path use cases | Select when absolute lowest power dominates over dual-output flexibility and 32-bit resolution |
| AD7768-1ACPZ | 24-bit sigma-delta ADC; 119 dB DR at 256 kSPS; single SPI port; integrated buffer; no composite output mode | Targets high-speed precision data acquisition with integrated analog front-end-not designed for multi-node synchronized arrays | Select when integrated input buffers and higher throughput (256 kSPS) outweigh need for 32-bit resolution and SYNC-based coherence |
Compared with ADS1287IRHBT and AD7768-1ACPZ, the LTC2500CDKD-32#PBF uniquely delivers true 32-bit resolution with guaranteed no-missing-codes, dual independent output streams, and hardware SYNC for deterministic multi-device alignment-making it irreplaceable in coherent seismic arrays and metrology-grade calibration systems.
Availability
LTC2500CDKD-32#PBF is available at Aetrix Electronics and suitable for seismology instrumentation, energy exploration sensors, and high-accuracy metrology systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC2500CDKD-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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2500-32 product line was developed by Linear Technology (acquired by ADI in 2017) to address ultra-high-precision DC and low-frequency measurement needs in geophysical sensing, scientific instrumentation, and metrology-where 32-bit resolution, sub-ppm linearity, and deterministic synchronization are non-negotiable.
FAQ
What is the maximum sampling rate of the LTC2500CDKD-32#PBF?
The LTC2500CDKD-32#PBF supports a maximum sampling frequency of 1 Msps. At this rate, the no-latency SDOB output delivers a full 32-bit composite code every 1 µs, while the filtered SDOA output latency depends on the selected down-sampling factor (e.g., 4 cycles for DF=4, ~16,384 cycles for DF=16384). The MCLK rising edge initiates each conversion, and BUSY indicates active conversion status.
Does the LTC2500CDKD-32#PBF support true 32-bit resolution with no missing codes?
Yes, the LTC2500CDKD-32#PBF guarantees 32-bit no missing codes across its full operating temperature range (0°C to 70°C). This is explicitly specified in the Electrical Characteristics table and verified through production testing. The device achieves this via a robust SAR architecture combined with precision trimming and on-chip digital correction, ensuring monotonicity and full-code coverage even at temperature extremes.
How does the SYNC pin function in multi-device configurations with the LTC2500CDKD-32#PBF?
The SYNC pin on the LTC2500CDKD-32#PBF accepts a synchronous pulse that aligns the phase of the internal digital filter across multiple devices. When asserted simultaneously, it forces identical decimation timing and filter state initialization, enabling coherent sampling across distributed nodes-critical for seismic arrays and beamforming applications. The SYNC signal is edge-triggered and referenced to OVDD logic levels.
What are the voltage and decoupling requirements for the REF pins on the LTC2500CDKD-32#PBF?
The REF pins (8 and 9) of the LTC2500CDKD-32#PBF accept an external reference voltage from 2.5 V to 5.1 V, with recommended operation at 5.0 V for optimal dynamic range. They must be decoupled with a 47 µF X7R ceramic capacitor (1210 size, 10 V rating) placed as close as possible to the pins. Dual REF pins reduce series inductance and improve PSRR, especially under high-current transient conditions during conversion.
Can the LTC2500CDKD-32#PBF operate with different supply voltages for analog and digital domains?
Yes, the LTC2500CDKD-32#PBF uses separate supplies: VDD (2.375 V–2.625 V) powers the analog SAR core and reference circuitry, while OVDD (1.71 V–5.25 V) powers all digital I/O pins (SCKA, SCKB, SDI, SDOA, SDOB, RDLA, RDLB, BUSY, SYNC, PRE, DRL). This separation allows interfacing with 1.8 V, 2.5 V, 3.3 V, or 5 V host controllers without level shifters, while maintaining analog performance integrity.
LTC2500CDKD-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
- Data Interface:
- Parallel, SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- 0:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.375V ~ 2.625V
- Voltage - Supply, Digital:
- 1.71V ~ 5.25V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-DFN (7x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2500CDKD-32#PBF FAQ
1.How can I place an order for LTC2500CDKD-32#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2500CDKD-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 LTC2500CDKD-32#PBF reliable?
The price and inventory of LTC2500CDKD-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 LTC2500CDKD-32#PBF is usually 5 days.
3.What payment methods are accepted for LTC2500CDKD-32#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2500CDKD-32#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2500CDKD-32#PBF?
LTC2500CDKD-32#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2500CDKD-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 LTC2500CDKD-32#PBF?
For technical support, including LTC2500CDKD-32#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2500CDKD-32#PBF requirements.
6.How does Aetrix verify that LTC2500CDKD-32#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2500CDKD-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 LTC2500CDKD-32#PBF meets industry standards.
7.What is the process for return or replacement of LTC2500CDKD-32#PBF?
All LTC2500CDKD-32#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2500CDKD-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 LTC2500CDKD-32#PBF part is unused and in its original packaging.
Return procedure for LTC2500CDKD-32#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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