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Analog Devices Inc. DC1925A-C
- Part No.:
- DC1925A-C
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC1925A-C.pdf
- Description:
- EVAL BOARD FOR LTC2376-20
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Product details
Overview
LTC2376-20 from Analog Devices (formerly Linear Technology) is a 20-bit, 250ksps successive approximation register (SAR) ADC with ±0.5ppm typical INL, 104dB SNR, and fully differential ±VREF input range. It operates from a 2.5V supply, supports VREF from 2.5V to 5.1V, and consumes only 5.3mW at full speed-enabling high-precision data acquisition in medical imaging and portable instrumentation.
For engineers reviewing the LTC2376-20 datasheet, LTC2376-20 pinout, LTC2376-20 application, or LTC2376-20 equivalent, key selection considerations include its no-missing-codes 20-bit resolution, digital gain compression (DGC) for single-supply amplifier interfacing, SPI-compatible daisy-chain capability, and guaranteed operation up to 85°C.
Technical Context
The LTC2376-20 implements a charge-redistribution SAR architecture with internal conversion clock, eliminating external timing dependencies. Its fully differential analog front-end accepts ±VREF inputs with common-mode range centered at VREF/2 ± 0.1V, and features 34MHz –3dB input bandwidth and 4ps aperture jitter.
Digital gain compression (DGC) maps zero-scale from 0V to 0.1·VREF and full-scale from VREF to 0.9·VREF when REF/DGC is grounded-enabling rail-to-rail input swing with single 5.5V-powered amplifiers. The SPI interface supports 1.8V–5V I/O levels and daisy-chain mode for multi-ADC systems without added latency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit-guarantees no missing codes across full operating temperature range. |
| Sampling Rate | 250ksps-fixed throughput with no pipeline delay or cycle latency. |
| INL | ±0.5ppm typical (±2ppm max)-enables sub-1ppm system-level linearity calibration. |
| SNR | 104dB typical at fIN = 2kHz-supports >17 effective bits (ENOB) in narrowband applications. |
| Power Consumption | 5.3mW at 250ksps; 5.3µW at 250sps-auto power-down scales dissipation linearly with sample rate. |
| Reference Range | 2.5V to 5.1V-allows flexible dynamic range tuning while maintaining 9.5µV LSB (at 5V ref). |
| Digital Interface | SPI-compatible with daisy-chain mode-enables synchronized sampling across multiple LTC2376-20 devices using one SCK line. |
Pinout & Package
The LTC2376-20 is available in two RoHS-compliant packages: 16-lead MSOP (3mm × 4.9mm) and 16-lead 4mm × 3mm DFN with exposed pad (GND). Both packages support operation from –40°C to 85°C (I-grade) or 0°C to 70°C (C-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN– | Differential analog input pair | Accepts ±VREF fully differential signal; input capacitance 45pF in sample mode; requires low-impedance drive for <1µs settling. |
| REF | Analog reference voltage input | Defines full-scale range; must be decoupled with 47µF X7R ceramic capacitor; supports 2.5V–5.1V. |
| REF/DGC | Reference/Digital Gain Compression control | Ground enables DGC (0.1–0.9×VREF input range); tied to REF disables DGC (±VREF range). |
| CNV | Convert trigger input | Rising edge initiates conversion; powers up device; logic level referenced to OVDD. |
| BUSY | Conversion status indicator | High during conversion; falls low when 20-bit result is ready on SDO; used for timing synchronization. |
| SDO, SCK, RDL/SDI, CHAIN | SPI serial interface signals | Support 1.8V–5V logic; daisy-chain mode enabled by CHAIN = high; MSB-first 2's complement output. |
| VDD, OVDD, GND | Power supplies | VDD = 2.5V ±62.5mV analog supply; OVDD = 1.71V–5.25V digital I/O supply; multiple GND pins minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Digital Gain Compression (DGC) | Eliminates need for negative supply in driving amplifier by shifting usable input range to 0.1–0.9×VREF, preserving full 20-bit resolution. |
| No Cycle Latency | First conversion completes in fixed 4µs after CNV rising edge; subsequent conversions occur every 4µs-ideal for deterministic real-time control loops. |
| Internal Conversion Clock | Removes dependency on external clock source or precise timing constraints; simplifies PCB layout and system synchronization. |
| Low Power Scaling | Power consumption drops linearly with sample rate-from 5.3mW at 250ksps to 5.3µW at 250sps-enabling battery-operated precision sensing. |
| Guaranteed 20-Bit Performance | Specified ±2ppm INL, 101dB SINAD, and no missing codes over –40°C to 85°C-validated across temperature and process corners. |
Applications
| Medical Imaging Signal Chain | Portable High-Resolution Data Logger |
|---|---|
Use Scenario: Digitizing low-noise CT or MRI sensor outputs requiring ultra-low distortion and long-term stability. IC Role / Device Role / Timing Role: Primary 20-bit SAR ADC capturing analog detector signals with 104dB SNR and –125dB THD. Use Value: Enables detection of sub-ppm signal variations critical for early-stage lesion identification without oversampling or post-processing correction. |
Use Scenario: Battery-powered field instrument measuring vibration, strain, or environmental parameters over extended deployments. IC Role / Device Role / Timing Role: Low-power, high-accuracy ADC interfaced to MEMS sensors and single-supply op-amps via DGC mode. Use Value: Achieves 20-bit resolution at 5.3µW standby power, extending operational life beyond 12 months on a single Li-ion cell. |
| Industrial Process Control Loop | Automated Test Equipment (ATE) |
Use Scenario: Closed-loop feedback in PLC analog I/O modules where DC accuracy and long-term drift directly impact product quality. IC Role / Device Role / Timing Role: Precision ADC in 4–20mA transmitter or sensor conditioning circuit with bipolar zero-scale error <±13ppm. Use Value: Reduces calibration frequency by 3× versus 18-bit alternatives due to ±0.5ppm typical INL and <±7ppb/°C zero-drift. |
Use Scenario: Multi-channel high-speed digitizer card validating mixed-signal ICs under production test conditions. IC Role / Device Role / Timing Role: Synchronized sampling node in daisy-chained configuration with 250ksps per channel and deterministic latency. Use Value: Eliminates inter-channel skew via hardware-triggered CNV and BUSY-driven readout-reducing test time by 18% vs software-timed solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS127L01 | 24-bit delta-sigma ADC; 400ksps; 110dB SNR; external reference required; no DGC function. | Better resolution but 1.6× slower effective throughput; higher power (12mW); suited for DC/low-frequency precision, not wideband acquisition. | Select when absolute DC accuracy >1ppm and bandwidth <10kHz dominates over speed and power. |
| AD4020 | 20-bit SAR ADC; 2MSPS; 100dB SNR; 1.8V/3.3V I/O only; no DGC; requires external oscillator. | Higher speed but lower SNR and no built-in DGC-demands dual-supply amplifier or complex level-shifting for single-rail systems. | Select when sampling >1Msps is mandatory and system can accommodate additional analog signal conditioning complexity. |
Compared with ADS127L01 and AD4020, the LTC2376-20 uniquely balances 20-bit no-missing-codes integrity, 250ksps throughput, ultra-low 5.3mW power, and integrated DGC-making it optimal for portable, battery-constrained, or single-supply industrial systems requiring both speed and precision.
Availability
LTC2376-20 is available at Aetrix Electronics and suitable for medical imaging signal chains, portable high-resolution data loggers, and industrial process control systems requiring stable component supply with guaranteed long-term availability.
Supply support for LTC2376-20 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 LTC2376-20 belongs to ADI's precision SAR ADC portfolio, designed specifically for applications demanding 20-bit accuracy at high speed with minimal power and simplified analog front-end design-especially where single-supply operation and thermal stability are critical.
FAQ
What is the maximum sampling rate of the LTC2376-20?
The LTC2376-20 achieves a fixed 250ksps sampling rate with no pipeline delay or cycle latency. Each conversion completes in 4µs, and the device guarantees no missing codes and ±2ppm INL across this full throughput range. This rate is internally clocked and does not require an external timing source.
How does Digital Gain Compression (DGC) work in the LTC2376-20?
In the LTC2376-20, DGC is enabled by grounding the REF/DGC pin. This remaps the full-scale input range from ±VREF to 0.1·VREF to 0.9·VREF-allowing single-supply amplifiers (e.g., powered from 5.5V) to drive the ADC without negative rails while retaining full 20-bit resolution and linearity.
Which packages are available for the LTC2376-20?
The LTC2376-20 is offered in two surface-mount packages: 16-lead MSOP (3mm × 4.9mm) and 16-lead 4mm × 3mm DFN with exposed thermal pad. Both support industrial temperature range (–40°C to 85°C) and feature identical pinouts and electrical specifications.
Does the LTC2376-20 require an external reference voltage?
Yes-the LTC2376-20 requires an external reference voltage applied to the REF pin, which sets the full-scale input range. REF must be between 2.5V and 5.1V and is typically decoupled with a 47µF X7R ceramic capacitor. The device does not include an internal reference.
Can multiple LTC2376-20 devices be synchronized for simultaneous sampling?
Yes-the LTC2376-20 supports hardware-triggered simultaneous sampling via the CNV pin. When multiple devices share a common CNV signal and operate in daisy-chain mode (CHAIN = high), their conversions start synchronously, and BUSY signals align to enable coordinated readout without software overhead.
DC1925A-C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Number of A/D Converters:
- 1
- Number of Bits:
- 20
- Sampling Rate (Per Second):
- 250k
- Data Interface:
- SPI
- Input Range:
- ±VREF
- Power (Typ) @ Conditions:
- 5.25mW @ 250kSPS
- Utilized IC / Part:
- LTC2376-20
- Contents:
- Board(s)
DC1925A-C FAQ
1.How can I place an order for DC1925A-C through Aetrix?
Please submit a Request for Quotation (RFQ) for DC1925A-C 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 DC1925A-C reliable?
The price and inventory of DC1925A-C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC1925A-C is usually 5 days.
3.What payment methods are accepted for DC1925A-C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC1925A-C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC1925A-C?
DC1925A-C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC1925A-C 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 DC1925A-C?
For technical support, including DC1925A-C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC1925A-C requirements.
6.How does Aetrix verify that DC1925A-C is sourced from the original manufacturer or authorized distributors?
All DC1925A-C 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 DC1925A-C meets industry standards.
7.What is the process for return or replacement of DC1925A-C?
All DC1925A-C units undergo pre-shipment inspection (PSI). If there is an issue with DC1925A-C, 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 DC1925A-C part is unused and in its original packaging.
Return procedure for DC1925A-C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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