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Analog Devices Inc. DC1796A-E
- Part No.:
- DC1796A-E
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC1796A-E.pdf
- Description:
- DEMO BOARD SAR ADC 18BIT 1.6MSPS
- Quantity:
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Product details
Overview
LTC2369-18 from Analog Devices (formerly Linear Technology) is an 18-bit pseudo-differential unipolar successive approximation register (SAR) ADC with 1.6 Msps throughput, 96.5 dB SNR (typ), ±2.5 LSB INL (max), and operation from a single 2.5 V supply. It supports VREF from 2.5 V to 5.1 V and delivers no missing codes at full resolution - ideal for high-speed medical imaging and portable instrumentation requiring precision DC-to-mid-frequency acquisition.
For engineers reviewing the LTC2369-18 datasheet, LTC2369-18 pinout, LTC2369-18 application, or LTC2369-18 equivalent, key selection criteria include guaranteed 18-bit monotonicity, zero-cycle latency, SPI-compatible daisy-chain capability, internal conversion clock, and operation up to 125°C in both MSOP and DFN packages.
Technical Context
The LTC2369-18 employs a charge redistribution capacitor DAC (CDAC) architecture with pseudo-differential sampling, where IN+ accepts 0 V to VREF input while IN– serves as ground-sense reference (±100 mV range). Conversion is initiated by a rising edge on CNV, with BUSY signaling completion and SDO outputting straight-binary 18-bit data MSB-first on SCK rising edges.
It features dual power domains: VDD (2.375–2.625 V) powers analog and core logic, while OVDD (1.71–5.25 V) independently supplies digital I/O - enabling interoperability with 1.8 V, 2.5 V, 3.3 V, or 5 V host systems. Auto power-down between conversions reduces idle current to 0.9 μA (H-grade), scaling dynamically with sample rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees monotonic transfer function and no missing codes across full temperature range. |
| Sampling Rate | 1.6 Msps - enables real-time capture of signals up to ~34 MHz (–3 dB input bandwidth) without pipeline delay. |
| SNR | 96.5 dB (typ, fIN = 2 kHz, VREF = 5 V) - supports >15.7 ENOB for high-fidelity signal digitization. |
| INL | ±2.5 LSB (max) - ensures accurate representation of linear sensor outputs or calibrated voltage rails. |
| Power Consumption | 18 mW at 1.6 Msps - enables battery-operated designs with thermal budget under 225 mW at full throughput. |
| Reference Range | 2.5 V to 5.1 V - allows flexible full-scale adjustment and compatibility with precision references like LTC6655-5. |
| Operating Temp | –40°C to +125°C (H-grade) - qualified for industrial process control and downhole instrumentation environments. |
Pinout & Package
Available in two RoHS-compliant packages: 16-lead MSOP (3 mm × 4.9 mm) and 4 mm × 3 mm DFN with exposed pad (GND). Both support same pinout and thermal performance per grade (θJA = 110°C/W for MSOP, 40°C/W for DFN).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode selector | High enables daisy-chain mode (RDL/SDI becomes serial input); low enables bus-enable mode (RDL/SDI controls SDO tri-state). |
| VDD (2) | Analog & core supply | 2.5 V ± 125 mV supply; requires 10 μF ceramic bypass to GND for stable conversion accuracy. |
| IN+ (4), IN– (5) | Pseudo-differential analog inputs | IN+ accepts 0 V to VREF; IN– is ground-sense node (±100 mV range) - rejects common-mode noise without true differential amplifier. |
| REF (7, 8) | Reference voltage inputs | Accepts 2.5 V–5.1 V external reference; draws pulsed current (~1.1 mA max at 1.6 Msps); requires 47 μF X5R ceramic decoupling. |
| CNV (9) | Convert trigger | Rising-edge–initiated conversion start; no minimum pulse width required; supports burst or continuous sampling. |
| BUSY (11) | Conversion status indicator | Active-high open-drain output; asserts at CNV↑, deasserts when 18-bit result is ready on SDO. |
| RDL/SDI (12) | Configurable serial interface pin | Function depends on CHAIN state: bus enable (low) or serial data input (high) - enables multi-ADC synchronization. |
| SCK (13), SDO (14) | SPI-compatible clock & data | SCK up to 100 MHz; SDO outputs straight-binary 18-bit code MSB-first; supports daisy-chain readout without additional GPIO. |
| OVDD (15) | Digital I/O supply | 1.71 V–5.25 V logic interface supply - matches host MCU/FPGA voltage without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| No cycle latency | First conversion completes in one sampling period (625 ns), eliminating pipeline delay - critical for closed-loop control timing. |
| Internal conversion clock | Removes need for external timing circuitry; simplifies PCB layout and reduces jitter-sensitive clock distribution paths. |
| Auto power-down | Reduces quiescent current to ≤0.9 μA (H-grade) between conversions - extends battery life in intermittent-sampling applications. |
| 1.8 V–5 V I/O compatibility | OVDD independence allows direct interfacing with mixed-voltage systems (e.g., 1.8 V FPGA + 3.3 V microcontroller) without translators. |
| Guaranteed 125°C operation | H-grade qualification ensures reliability in harsh environments such as motor drives, aerospace avionics, and oil-field sensors. |
Applications
| Medical Imaging | High-Speed Data Acquisition |
|---|---|
|
Use Scenario: Digitizing ultrasound echo signals or MRI gradient waveforms requiring wide dynamic range and minimal harmonic distortion. IC Role / Device Role / Timing Role: Primary SAR ADC capturing 1.6 Msps sampled analog front-end outputs with <1 ps aperture jitter and 96.5 dB SNR. Use Value: Enables >15-bit effective resolution at 2 kHz input, supporting diagnostic image clarity and artifact-free reconstruction. |
Use Scenario: Real-time waveform capture in automated test equipment (ATE) for semiconductor parametric testing. IC Role / Device Role / Timing Role: High-throughput ADC synchronizing with pattern generator clocks via CNV-triggered acquisition and BUSY-driven readout. Use Value: Eliminates pipeline latency, allowing immediate post-conversion analysis and deterministic pass/fail decisions within one sample period. |
| Portable Instrumentation | Industrial Process Control |
|
Use Scenario: Battery-powered handheld spectrum analyzers or portable oscilloscopes needing precision measurement with low thermal dissipation. IC Role / Device Role / Timing Role: Low-power 18-bit ADC operating at 1.6 Msps with auto power-down during idle intervals between sweeps. Use Value: Achieves 18 mW active power and <1 μA shutdown current - extends single-charge battery life beyond 10 hours in burst-mode use. |
Use Scenario: Monitoring high-voltage motor phase currents or temperature sensor arrays in factory automation PLC modules. IC Role / Device Role / Timing Role: Precision ADC interfacing with isolated amplifiers and precision references (e.g., LTC6655-5) over extended temperature range. Use Value: Maintains ±2.5 LSB INL and 96.5 dB SNR from –40°C to +125°C - ensures calibration stability across seasonal ambient shifts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7960BCPZ-RL7 | 18-bit, 5 Msps, but requires external reference and separate VDRIVE supply; no integrated daisy-chain mode. | Better speed for transient capture, but higher system complexity and power (39 mW at 5 Msps). | Select when >1.6 Msps throughput is mandatory and board space allows extra decoupling and reference circuitry. |
| ADS8860IDRCT | 16-bit, 1 Msps, single-supply (2.5–5 V), SPI-only interface; lower SNR (92.5 dB) and no CHAIN pin. | Lower cost and simpler layout, but insufficient resolution for demanding medical or metrology use cases. | Select for cost-sensitive industrial sensors where 16-bit resolution and 1 Msps meet accuracy requirements. |
Compared with AD7960BCPZ-RL7 and ADS8860IDRCT, the LTC2369-18 uniquely balances 18-bit integrity, 1.6 Msps throughput, internal clocking, and daisy-chain capability in a thermally efficient 16-pin package - making it optimal for space-constrained, multi-channel, high-accuracy embedded systems.
Availability
LTC2369-18 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 LTC2369-18 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 LTC2369-18 belongs to ADI's precision SAR ADC product line, engineered for applications demanding high resolution, low latency, and robust operation across extreme temperatures - especially where traditional pipeline or sigma-delta architectures introduce unacceptable delay or noise.
FAQ
What is the maximum sampling rate supported by the LTC2369-18?
The LTC2369-18 supports a maximum sampling rate of 1.6 Msps, with guaranteed timing parameters including tCYC = 625 ns and tCONV = 412 ns (max). This rate is achievable across the full operating temperature range for H-grade parts, and the device exhibits no pipeline delay - meaning each conversion result is available immediately after BUSY deasserts.
Does the LTC2369-18 require an external reference voltage?
Yes, the LTC2369-18 requires an external reference voltage applied to the REF pins (7 and 8). It accepts VREF from 2.5 V to 5.1 V, and performance metrics like SNR and INL are specified with VREF = 5 V. For optimal results, Analog Devices recommends the LTC6655-5 low-noise, low-drift reference, especially in high-precision or high-temperature applications.
How does the CHAIN pin affect the serial interface behavior of the LTC2369-18?
When CHAIN = low, RDL/SDI functions as a bus-enable input controlling SDO tri-state; when CHAIN = high, RDL/SDI becomes a serial data input for daisy-chaining multiple LTC2369-18 devices. This eliminates the need for additional GPIO lines to manage multi-ADC readout, reducing host controller pin count and simplifying firmware for synchronized sampling.
What power supply configurations are supported by the LTC2369-18?
The LTC2369-18 uses two independent supplies: VDD (2.375–2.625 V) for analog and core logic, and OVDD (1.71–5.25 V) for digital I/O. This separation allows interfacing with 1.8 V, 2.5 V, 3.3 V, or 5 V host systems without level shifters. No strict power sequencing is required, and the internal POR resets the device if either supply drops below 1 V.
Is the LTC2369-18 suitable for operation at 125°C?
Yes - the LTC2369HMS-18 and LTC2369HDE-18 variants are fully specified and tested from –40°C to +125°C. Key parameters including ±2.5 LSB INL (max), 96.5 dB SNR (typ), and 1.6 Msps throughput are guaranteed across this range, and thermal resistance (θJA) is characterized for both MSOP and DFN packages to support reliable thermal design.
DC1796A-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Number of A/D Converters:
- 1
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 1.6M
- Data Interface:
- SPI
- Input Range:
- 0 ~ VREF
- Power (Typ) @ Conditions:
- 18mW @ 1.6MSPS
- Utilized IC / Part:
- LTC2369-18, LTC6360
- Contents:
- Board(s)
DC1796A-E FAQ
1.How can I place an order for DC1796A-E through Aetrix?
Please submit a Request for Quotation (RFQ) for DC1796A-E 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 DC1796A-E reliable?
The price and inventory of DC1796A-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC1796A-E is usually 5 days.
3.What payment methods are accepted for DC1796A-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC1796A-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC1796A-E?
DC1796A-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC1796A-E 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 DC1796A-E?
For technical support, including DC1796A-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC1796A-E requirements.
6.How does Aetrix verify that DC1796A-E is sourced from the original manufacturer or authorized distributors?
All DC1796A-E 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 DC1796A-E meets industry standards.
7.What is the process for return or replacement of DC1796A-E?
All DC1796A-E units undergo pre-shipment inspection (PSI). If there is an issue with DC1796A-E, 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 DC1796A-E part is unused and in its original packaging.
Return procedure for DC1796A-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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