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Analog Devices Inc. DC2135A
- Part No.:
- DC2135A
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC2135A.pdf
- Description:
- EVAL BOARD FOR LTC2378
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Product details
Overview
LTC2378-20 from Analog Devices (formerly Linear Technology) is a 20-bit, 1 Msps successive approximation register (SAR) analog-to-digital converter with ±0.5 ppm typical integral nonlinearity, 104 dB SNR at 2 kHz, and digital gain compression (DGC) for single-supply amplifier interfacing. It operates from a 2.5 V analog supply, supports ±VREF fully differential input range (VREF = 2.5 V to 5.1 V), and consumes only 21 mW at full throughput - used in high-precision medical imaging and portable instrumentation.
For engineers reviewing the LTC2378-20 datasheet, LTC2378-20 pinout, LTC2378-20 application, or LTC2378-20 equivalent, key selection criteria include guaranteed 20-bit no-missing-codes performance, daisy-chain SPI interface compatibility across 1.8 V–5 V logic, internal conversion clock, and DGC-enabled 0.5 V to 4.5 V input range with 5 V reference.
Technical Context
The LTC2378-20 implements a charge-redistribution SAR architecture with a 20-bit CDAC and differential comparator, achieving zero-cycle latency and no pipeline delay. Its internal oscillator eliminates external timing dependencies, while auto power-down between conversions scales quiescent current from 21 mW at 1 Msps to 21 µW at 1 ksps.
Digital Gain Compression (DGC) remaps the ADC's transfer function so zero-scale corresponds to 0.1·VREF and full-scale to 0.9·VREF, enabling rail-to-rail input swing with single-supply amplifiers. The SPI-compatible serial interface supports both normal mode (RDL/SDI as bus enable) and daisy-chain mode (RDL/SDI as serial data input) via the CHAIN pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit SAR ADC with guaranteed no missing codes - ensures full dynamic range utilization without code gaps. |
| Sampling Rate | 1 Msps maximum - enables real-time capture of signals up to 34 MHz input bandwidth (–3 dB). |
| INL | ±0.5 ppm typical, ±2 ppm max - supports precision metrology requiring sub-ppm linearity. |
| SNR | 104 dB typical at fIN = 2 kHz, VREF = 5 V - delivers >16.9 effective number of bits (ENOB). |
| Power Consumption | 21 mW at 1 Msps, 21 µW at 1 ksps - ultra-low power scaling ideal for battery-operated systems. |
| Digital Interface | SPI-compatible, 1.8 V–5 V I/O voltage support, daisy-chain mode - simplifies multi-ADC synchronization without FPGA logic. |
| Reference Range | VREF = 2.5 V to 5.1 V - allows flexible signal chain design with standard precision references. |
Pinout & Package
The LTC2378-20 is available in two RoHS-compliant packages: 16-lead MSOP (3 mm × 4.9 mm) and 16-lead 4 mm × 3 mm 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 |
|---|---|---|
| CHAIN (Pin 1) | Mode selector | High enables daisy-chain SPI; low configures RDL/SDI as bus-enable control - determines serial topology without external logic. |
| VDD (Pin 2) | Analog supply | 2.375 V–2.625 V, 2.5 V nominal - powers core ADC circuitry; requires 10 µF ceramic bypass to GND. |
| IN+, IN– (Pins 4, 5) | Differential analog inputs | Accept ±VREF fully differential signal; 45 pF sampling capacitance and 40 Ω switch resistance define drive requirements. |
| REF (Pin 7) | Reference voltage input | 2.5 V–5.1 V range; decoupled with 47 µF X7R ceramic capacitor - sets full-scale range and LSB size (9.5 µV @ 5 V). |
| REF/DGC (Pin 8) | DGC enable/control | Tied to GND enables DGC (0.1·VREF to 0.9·VREF input range); tied to REF disables DGC (±VREF range). |
| CNV (Pin 9) | Convert trigger | Rising edge initiates acquisition and conversion - synchronous start with no latency; OVDD-referenced logic. |
| BUSY (Pin 11) | Conversion status | Active-high open-drain output indicates conversion in progress - enables precise timing of data readback. |
| RDL/SDI (Pin 12) | Serial interface control/data | In normal mode: bus enable; in chain mode: serial data input - dual-function pin reduces PCB routing complexity. |
| SCK (Pin 13) | Serial clock | Up to 100 MHz SCK frequency supported - defines data shift rate; OVDD-referenced, 50% duty cycle required. |
| SDO (Pin 14) | Serial data output | 2's complement 20-bit output, MSB-first; active during SCK rising edges - compatible with standard SPI master peripherals. |
| OVDD (Pin 15) | I/O supply | 1.71 V–5.25 V - sets logic thresholds for all digital pins; bypassed with 0.1 µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Digital Gain Compression (DGC) | Eliminates need for negative supply on driving amplifier by shifting full-scale input range to 0.1·VREF–0.9·VREF, preserving 20-bit resolution. |
| No Pipeline Delay / Zero Cycle Latency | Enables deterministic, real-time sampling - critical for closed-loop control and time-of-flight measurements. |
| Internal Conversion Clock | Removes requirement for external clock source or PLL - simplifies system timing architecture and reduces BOM count. |
| Auto Power-Down Between Conversions | Reduces average power proportionally to sampling rate - extends battery life in intermittent-sampling applications. |
| 1.8 V–5 V I/O Voltage Compatibility | Interoperates directly with microcontrollers, FPGAs, and ASICs across multiple logic families without level-shifting. |
Applications
| Medical Imaging | High-Speed Data Acquisition |
|---|---|
Use Scenario: Digitizing low-noise CT/PET detector signals with wide dynamic range and minimal harmonic distortion. IC Role / Device Role / Timing Role: Primary 20-bit SAR ADC capturing analog sensor outputs at up to 1 Msps with <104 dB SNR and –125 dB THD. Use Value: Enables detection of weak photon events while rejecting noise floor - critical for image contrast and diagnostic accuracy. | Use Scenario: Real-time waveform capture in automated test equipment (ATE) for semiconductor characterization. IC Role / Device Role / Timing Role: High-fidelity digitizer with zero-latency conversion and daisy-chain capability for synchronized multi-channel sampling. Use Value: Eliminates inter-channel skew and guarantees sample alignment across 8+ channels without external clock distribution. |
| Portable Instrumentation | Industrial Process Control |
Use Scenario: Battery-powered handheld spectrum analyzers requiring high resolution and low power consumption. IC Role / Device Role / Timing Role: Core ADC operating at 100 ksps with auto power-down, delivering 102 dB SNR and 20-bit linearity. Use Value: Extends runtime beyond 8 hours per charge while maintaining laboratory-grade measurement fidelity. | Use Scenario: Precision analog input module in PLCs monitoring temperature, pressure, and flow sensors. IC Role / Device Role / Timing Role: Isolated front-end ADC with ±0.5 ppm INL and robust ESD-tolerant inputs for factory-floor environments. Use Value: Reduces calibration frequency and improves long-term stability - lowers total cost of ownership over 10-year deployment. |
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 |
|---|---|---|---|
| AD7960BCPZ | 18-bit, 5 Msps, 91 dB SNR, no DGC, LVDS interface - higher speed but lower resolution and no single-supply input flexibility. | Best suited for high-throughput applications where 18-bit resolution suffices and LVDS infrastructure exists. | Select when sampling rate >1 Msps is mandatory and DGC is not required for amplifier interface. |
| ADS8860IPWR | 16-bit, 1 Msps, 89 dB SNR, SPI-only, no DGC, 1.8 V supply - lower resolution, simpler interface, significantly lower power (1.5 mW). | Targeted at cost-sensitive, space-constrained portable devices where 16-bit ENOB meets system requirements. | Select when 16-bit resolution is acceptable and ultra-low power (<2 mW) dominates over linearity and SNR. |
Compared with AD7960BCPZ and ADS8860IPWR, the LTC2378-20 uniquely combines 20-bit resolution, 104 dB SNR, and DGC in a single 2.5 V supply ADC - making it optimal for applications demanding metrology-grade accuracy with simplified analog front-end design.
Availability
LTC2378-20 is available at Aetrix Electronics and suitable for medical imaging systems, high-speed data acquisition modules, and portable instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2378-20 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 LTC2378-20 belongs to ADI's precision SAR ADC product line, engineered for applications demanding ultra-low noise, exceptional linearity, and low-power operation in compact form factors.
FAQ
What is the maximum sampling rate of the LTC2378-20?
The LTC2378-20 achieves a maximum sampling rate of 1 Msps with no cycle latency. This is enabled by its internal conversion clock and zero-pipeline-delay SAR architecture. At this rate, the device consumes 21 mW and delivers 104 dB SNR with ±0.5 ppm typical INL. The LTC2378-20 maintains guaranteed 20-bit no-missing-codes performance across its full operating temperature range.
How does Digital Gain Compression (DGC) work in the LTC2378-20?
Digital Gain Compression (DGC) in the LTC2378-20 remaps the ADC's transfer function so that zero-scale code corresponds to 0.1·VREF and full-scale code to 0.9·VREF. When the REF/DGC pin is tied to GND, the LTC2378-20 accepts an input range of 0.5 V to 4.5 V with a 5 V reference - eliminating the need for a negative supply on the driving amplifier while preserving full 20-bit resolution.
Which packages are available for the LTC2378-20?
The LTC2378-20 is offered in two surface-mount packages: 16-lead plastic MSOP (3 mm × 4.9 mm) and 16-lead 4 mm × 3 mm plastic DFN with exposed pad. Both packages support industrial temperature range (–40°C to +85°C) and commercial range (0°C to +70°C), with lead-free finish and tape-and-reel packaging options available for automated assembly.
Does the LTC2378-20 require an external clock source?
No, the LTC2378-20 does not require an external clock source. It features an internal oscillator that sets the conversion time, eliminating external timing dependencies and simplifying system design. The internal clock enables deterministic 1 Msps operation with no setup or hold timing constraints on the CNV pin - only a clean rising edge is needed to initiate conversion.
What is the role of the CHAIN pin on the LTC2378-20?
The CHAIN pin (Pin 1) on the LTC2378-20 selects between normal SPI mode and daisy-chain mode. When pulled low, RDL/SDI functions as a bus-enable input; when pulled high, RDL/SDI becomes a serial data input for cascading multiple LTC2378-20 devices. This allows synchronized multi-ADC acquisition using a single SCK and SDO line - reducing controller GPIO usage and PCB routing complexity.
DC2135A 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):
- 1M
- Data Interface:
- SPI
- Input Range:
- ±VREF
- Power (Typ) @ Conditions:
- 21mW @ 1MSPS
- Utilized IC / Part:
- LTC2378-20
- Contents:
- Board(s)
DC2135A FAQ
1.How can I place an order for DC2135A through Aetrix?
Please submit a Request for Quotation (RFQ) for DC2135A 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 DC2135A reliable?
The price and inventory of DC2135A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC2135A is usually 5 days.
3.What payment methods are accepted for DC2135A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC2135A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC2135A?
DC2135A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC2135A 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 DC2135A?
For technical support, including DC2135A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC2135A requirements.
6.How does Aetrix verify that DC2135A is sourced from the original manufacturer or authorized distributors?
All DC2135A 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 DC2135A meets industry standards.
7.What is the process for return or replacement of DC2135A?
All DC2135A units undergo pre-shipment inspection (PSI). If there is an issue with DC2135A, 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 DC2135A part is unused and in its original packaging.
Return procedure for DC2135A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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