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Analog Devices Inc. DC1925A-B
- Part No.:
- DC1925A-B
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC1925A-B.pdf
- Description:
- EVAL BOARD FOR LTC2377-20
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Product details
Overview
LTC2377-20 from Analog Devices (formerly Linear Technology) is a 20-bit, 500ksps successive approximation register (SAR) ADC with ±0.5ppm typical INL, 104dB SNR, and digital gain compression (DGC) for single-supply amplifier interfacing. It operates from a 2.5V analog supply, supports ±VREF fully differential inputs (2.5V–5.1V reference), and targets high-precision data acquisition in medical imaging and portable instrumentation.
For engineers reviewing the LTC2377-20 datasheet, LTC2377-20 pinout, LTC2377-20 application, or LTC2377-20 equivalent, key selection criteria include guaranteed 20-bit no-missing-codes performance, daisy-chain SPI interface compatibility, internal conversion clock, low 10.5mW power at full throughput, and DGC-enabled 0.5V–4.5V input range with 5V reference.
Technical Context
The LTC2377-20 implements a charge-redistribution SAR architecture with a 20-bit CDAC and differential comparator, achieving no pipeline delay and zero cycle latency. Its internal oscillator fixes conversion time at 1.5µs, eliminating external timing dependencies while enabling deterministic sampling.
Digital gain compression (DGC) remaps the ADC's transfer function to compress the full-scale range from ±VREF to 0.1×VREF–0.9×VREF, allowing rail-to-rail input signal conditioning using only a single 5.5V amplifier supply. The SPI-compatible serial interface supports 1.8V–5V I/O levels and daisy-chain mode for multi-ADC synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit - delivers 1 ppm LSB size (9.5 µV at 5V reference) with guaranteed no missing codes. |
| Sampling Rate | 500 ksps - enables real-time capture of signals up to 34 MHz bandwidth without undersampling. |
| INL | ±0.5 ppm typical - ensures <0.00005% linearity error across full scale, critical for calibration-sensitive systems. |
| SNR | 104 dB typical at 2 kHz - supports >17 effective bits (ENOB) for ultra-low-noise measurement applications. |
| Power Consumption | 10.5 mW at 500 ksps - enables battery-operated precision instruments with thermal budget under 150 mW. |
| Reference Range | 2.5 V to 5.1 V - allows flexible system-level scaling between noise floor and dynamic range trade-offs. |
| Digital Gain Compression | Enabled via REF/DGC pin tied to GND - shifts input range to 0.5 V–4.5 V with 5 V reference, removing need for negative amplifier supply. |
Pinout & Package
Available in 16-lead MSOP and 4 mm × 3 mm DFN packages; both feature exposed pad (GND) for thermal management. DFN package uses Pin 17 as soldered exposed ground pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN– | Differential analog input pair | Accepts ±VREF fully differential signal; 45 pF switched-capacitor input impedance requires low-Z drive or RC filtering. |
| REF | Reference voltage input | Defines full-scale range; must be decoupled with 47 µF X7R ceramic capacitor close to pin. |
| REF/DGC | Reference/Digital Gain Compression control | Tied to REF → standard ±VREF range; tied to GND → DGC active (0.1×VREF to 0.9×VREF mapping). |
| CNV | Convert trigger input | Rising edge initiates acquisition and conversion; auto-powers-up device from sleep state. |
| BUSY | Conversion status indicator | Active-high open-drain output signaling ongoing conversion; used for timing coordination or interrupt generation. |
| SDO, SCK, RDL/SDI, CHAIN | SPI-compatible serial interface | Supports 1.8V–5V logic; CHAIN high enables daisy-chain mode for synchronized multi-ADC readout. |
| VDD, OVDD, GND | Analog, I/O, and ground supplies | VDD = 2.5 V ±62.5 mV; OVDD = 1.71 V–5.25 V; separate supplies isolate analog noise from digital switching. |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes at 20 bits | Guaranteed monotonicity ensures unambiguous code transitions across full temperature range (–40°C to 85°C). |
| Internal conversion clock | Eliminates external clock source dependency and jitter sensitivity, simplifying PCB layout and timing validation. |
| Digital gain compression (DGC) | Enables single-supply amplifier design by shifting usable input range to 0.5 V–4.5 V with 5 V reference, preserving full 20-bit resolution. |
| Auto power-down between conversions | Reduces idle power to 10.5 µW at 500 sps, extending battery life in intermittent-sampling applications. |
| 104 dB SNR at 2 kHz | Validated with 5 V reference and 2.5 V common-mode; supports ENOB >17.2 bits for metrology-grade measurements. |
Applications
| Medical Imaging | High-Speed Data Acquisition |
|---|---|
|
Use Scenario: Digitizing low-amplitude, high-frequency ultrasound echo signals in portable ultrasound systems. IC Role / Device Role / Timing Role: Primary 20-bit SAR ADC capturing analog beamformed RF data at 500 ksps with minimal latency. Use Value: 104 dB SNR preserves weak tissue boundary contrast; DGC allows use of single 5.5 V supply for front-end amplifiers, reducing board area and BOM count. |
Use Scenario: Real-time waveform capture in automated test equipment (ATE) for semiconductor parametric testing. IC Role / Device Role / Timing Role: High-accuracy digitizer synchronizing with stimulus generators via CNV-triggered acquisition. Use Value: Zero cycle latency and deterministic 1.5 µs conversion enable precise time-domain correlation; daisy-chain SPI supports multi-channel parallel sampling. |
| Portable Instrumentation | Industrial Process Control |
|
Use Scenario: Battery-powered handheld spectrum analyzers requiring high dynamic range and low power consumption. IC Role / Device Role / Timing Role: Core ADC in IF sampling path, operating at reduced sample rates during standby with automatic power-down. Use Value: 10.5 µW power at 500 sps extends runtime; ±0.5 ppm INL ensures traceable calibration without field recalibration. |
Use Scenario: Precision analog input module in PLC I/O cards measuring strain gauge or RTD sensor outputs. IC Role / Device Role / Timing Role: Isolated 20-bit digitizer interfaced via transformer-coupled SPI to maintain galvanic separation. Use Value: 2.5 V supply and 1.8 V–5 V I/O support simplify level-shifting in isolated domains; 85°C operation ensures reliability in industrial enclosures. |
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 |
|---|---|---|---|
| AD4020BCPZ-RL7 | 20-bit, 1.8 Msps, 100 dB SNR, 2.5 V supply, but no DGC function and requires external clock. | Higher speed suits faster transient capture; lacks DGC, so dual-supply amplifier needed for full-range bipolar input. | Select when throughput >500 ksps is mandatory and system can accommodate external clock routing and dual-supply signal chain. |
| ADS1263IPBSR | 24-bit delta-sigma ADC, 38 ksps max, integrated PGA and reference, but higher latency and lower bandwidth (0.1–37.5 kHz). | Optimized for DC/low-frequency sensor readings (e.g., weigh scales); not suitable for >100 kHz signal content. | Select for ultra-high DC precision with on-chip diagnostics; avoid for AC-coupled or wideband applications requiring ≥500 ksps. |
Compared with AD4020BCPZ-RL7 and ADS1263IPBSR, the LTC2377-20 uniquely balances 500 ksps throughput, 20-bit integrity, and DGC-enabled single-supply interfacing-making it optimal for portable, battery-constrained, wide-dynamic-range systems where amplifier supply count and layout simplicity are critical.
Availability
LTC2377-20 is available at Aetrix Electronics and suitable for medical imaging systems, portable instrumentation, and industrial process control applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC2377-20 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 semiconductors, serving precision measurement, industrial, and communications markets.
The LTC2377-20 belongs to ADI's legacy Linear Technology high-speed precision SAR ADC product line, designed specifically for applications demanding 20-bit accuracy at multi-hundred-ksps rates with minimal power and layout complexity.
FAQ
What is the maximum sampling rate of the LTC2377-20?
The LTC2377-20 achieves a maximum sampling rate of 500 ksps with no pipeline delay or cycle latency. This is guaranteed across the full operating temperature range (–40°C to 85°C) and supported by its internal oscillator, which fixes conversion time at 1.5 µs. At this rate, the LTC2377-20 consumes 10.5 mW and maintains 104 dB SNR and ±0.5 ppm INL typical performance.
How does Digital Gain Compression (DGC) work in the LTC2377-20?
Digital Gain Compression in the LTC2377-20 is enabled by grounding the REF/DGC pin, which redefines the full-scale input range from ±VREF to 0.1×VREF–0.9×VREF. For a 5 V reference, this yields a usable 0.5 V–4.5 V differential input span. The LTC2377-20 performs internal digital scaling to preserve all 20 bits of resolution while eliminating the need for a negative supply in the driving amplifier stage.
Which packages are available for the LTC2377-20?
The LTC2377-20 is offered in two RoHS-compliant packages: 16-lead plastic MSOP and 16-lead (4 mm × 3 mm) plastic DFN. Both variants include an exposed pad (Pin 17 in DFN) that must be soldered to the PCB ground plane for thermal and electrical performance. Temperature grades include commercial (0°C to 70°C) and industrial (–40°C to 85°C) versions.
Does the LTC2377-20 require an external clock source?
No, the LTC2377-20 integrates an internal oscillator that sets conversion timing deterministically at 1.5 µs, eliminating dependency on external clocks and associated jitter concerns. The SCK pin is used solely for SPI data transfer timing and supports frequencies up to 100 MHz; it does not control conversion initiation, which is triggered by the CNV pin rising edge.
What is the purpose of the CHAIN pin on the LTC2377-20?
The CHAIN pin (Pin 1) configures the LTC2377-20's serial interface mode: when low, RDL/SDI acts as a bus-enable input for standard SPI operation; when high, RDL/SDI becomes a serial data input for daisy-chain mode. In daisy-chain configuration, multiple LTC2377-20 devices share one SCK and CNV, enabling synchronized sampling and compact SPI bus utilization without additional GPIOs.
DC1925A-B 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):
- 500k
- Data Interface:
- SPI
- Input Range:
- ±VREF
- Power (Typ) @ Conditions:
- 10.5mW @ 500kSPS
- Utilized IC / Part:
- LTC2377-20
- Contents:
- Board(s)
DC1925A-B FAQ
1.How can I place an order for DC1925A-B through Aetrix?
Please submit a Request for Quotation (RFQ) for DC1925A-B 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-B reliable?
The price and inventory of DC1925A-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC1925A-B is usually 5 days.
3.What payment methods are accepted for DC1925A-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC1925A-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC1925A-B?
DC1925A-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC1925A-B 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-B?
For technical support, including DC1925A-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC1925A-B requirements.
6.How does Aetrix verify that DC1925A-B is sourced from the original manufacturer or authorized distributors?
All DC1925A-B 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-B meets industry standards.
7.What is the process for return or replacement of DC1925A-B?
All DC1925A-B units undergo pre-shipment inspection (PSI). If there is an issue with DC1925A-B, 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-B part is unused and in its original packaging.
Return procedure for DC1925A-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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