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Analog Devices Inc. DC209A
- Part No.:
- DC209A
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC209A.pdf
- Description:
- LTC1404CS8 - 12-BIT, HIGH SPEED
- Quantity:
- Payment:
- Shipping:
Inventory:4,440
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Product details
Overview
LTC1404 from Analog Devices (formerly Linear Technology) is a complete 12-bit, 600ksps successive-approximation ADC in SO-8 package, featuring integrated sample-and-hold, precision 2.43V bandgap reference, and 3-wire SPI/MICROWIRE-compatible serial interface. It operates from single 5V or ±5V supplies, supports unipolar (0V–4.096V) and bipolar (±2.048V) input ranges, and delivers 69dB S/(N+D) at 100kHz - used in high-speed data acquisition systems requiring low-power, high-accuracy analog-to-digital conversion.
For engineers reviewing the LTC1404 datasheet, LTC1404 pinout, LTC1404 application, or LTC1404 equivalent, this page provides verified technical context, validated pin functions, confirmed AC/DC performance specs across temperature, real-world power mode behavior (Nap/Sleep), and alternative selection guidance for signal chain design in portable instrumentation and DSP interfaces.
Technical Context
The LTC1404 implements a 12-bit capacitive DAC-based successive approximation architecture with internal zeroing switch and comparator offset nulling during acquisition. Its sample-and-hold acquires analog inputs in 160ns (bipolar) or 200ns (unipolar), followed by bit-by-bit comparison synchronized to an external 9.6MHz clock.
Conversion control uses edge-triggered CONV (rising edge starts conversion), while CLK governs serial output timing and wake-up from Nap/Sleep modes. The 3-wire interface outputs 12-bit straight-binary data on DOUT with REFRDY flag embedded in sleep-mode wake-up words - enabling deterministic synchronization with microcontrollers and DSPs without external handshaking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes over full temperature range - guarantees monotonicity and predictable code transitions in closed-loop control. |
| Max Sampling Rate | 600ksps - enables real-time capture of signals up to 300kHz Nyquist bandwidth with 72dB S/(N+D) at Nyquist. |
| Power Dissipation | 75mW typical in normal operation; 7.5mW in Nap mode (instant wake-up); 60µW in Sleep mode - supports battery-powered and thermally constrained designs. |
| Analog Input Range | 0V to 4.096V (unipolar) or ±2.048V (bipolar) - maps directly to 1mV/LSB scaling, simplifying sensor interface calibration. |
| INL / DNL | ±1LSB integral and differential nonlinearity - ensures <1 LSB error in precision measurement applications like industrial transducers. |
| Reference Output | 2.43V ±10ppm/°C tempco, 1mA drive capability - stable internal reference eliminates need for external voltage reference in most applications. |
| S/(N + D) | 69dB at 100kHz input, 72dB at 300kHz - meets dynamic range requirements for audio preprocessing and spectrum analysis. |
Pinout & Package
Package: 8-lead plastic SOIC (SO-8), 150 mil width, JEDEC MS-012AC, θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Positive supply rail | 4.75V–5.25V for unipolar or bipolar operation; requires 10µF + 0.1µF bypass to GND for noise immunity. |
| AIN (Pin 2) | Analog input node | High-impedance input accepting 0V–4.096V (unipolar) or ±2.048V (bipolar); 5pF hold capacitance minimizes charge injection errors. |
| VREF (Pin 3) | Internal reference output | 2.43V ±10ppm/°C bandgap reference; can be overdriven externally ≥2.46V for span adjustment in bipolar mode. |
| GND (Pin 4) | Analog ground reference | Must connect directly to low-impedance analog ground plane; separates analog and digital return paths. |
| DOUT (Pin 5) | Serial data output | 3-wire SPI/MICROWIRE-compatible output; tri-state capable; outputs 12-bit straight-binary word with optional REFRDY flag. |
| VSS (Pin 8) | Negative supply rail | –5V for bipolar operation only; tied to GND for unipolar use; requires same bypass as VCC. |
| CONV (Pin 7) | Conversion start trigger | Rising-edge sensitive; pulses initiate conversion or enter Nap/Sleep modes (2 or 4 pulses respectively). |
| CLK (Pin 6) | Serial clock input | 0.1–9.6MHz clock; minimum 40ns pulse width; controls data shift-out timing and wake-up from low-power states. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated sample-and-hold | 160ns acquisition time in bipolar mode enables accurate sampling of fast-rising transients without external circuitry. |
| Auto bipolar/unipolar detection | VSS pin voltage below GND automatically configures internal logic for bipolar operation - simplifies system-level supply sequencing. |
| Reference-ready flag (REFRDY) | Embedded in serial data word after Sleep wake-up - allows firmware to delay first conversion until reference settles within 2.5ms. |
| Low-leakage analog input | ±1µA max input leakage during conversion - reduces gain/offset errors when interfacing high-impedance sensors or passive filters. |
| Hi-Z DOUT with programmable drive | Tri-state output supports shared bus topologies; VOL ≤ 0.1V at 1.6mA sink current ensures robust logic-level compatibility. |
Applications
| High-Speed Data Acquisition | DSP Interface for Real-Time Processing |
|---|---|
Use Scenario: Simultaneous sampling of multiple sensor channels in portable test equipment with onboard FFT analysis. IC Role / Device Role / Timing Role: Primary ADC capturing 600k samples/sec with deterministic 1.36µs conversion time and synchronous serial output aligned to system clock domain. Use Value: Eliminates need for external sample-and-hold or reference ICs, reducing BOM count and PCB area while maintaining 12-bit linearity across –40°C to 85°C. | Use Scenario: Feeding digitized audio or telecom signals into TI C6000 or Analog Devices SHARC processors for filtering and modulation. IC Role / Device Role / Timing Role: SPI/MICROWIRE-compatible ADC providing 12-bit data stream synchronized to processor's serial port clock with minimal glue logic. Use Value: Guaranteed no-missing-codes and 69dB SNR at 100kHz enable clean baseband signal reconstruction without post-processing correction. |
| Battery-Powered Instrumentation | Industrial Sensor Signal Conditioning |
Use Scenario: Handheld multimeter or oscilloscope probe with >8-hour battery life using duty-cycled sampling. IC Role / Device Role / Timing Role: ADC operating in Nap mode between measurements (7.5mW), waking instantly on trigger to perform burst acquisition. Use Value: 60µW Sleep mode current extends runtime significantly versus standard SAR ADCs; REFRDY flag prevents invalid conversions during wake-up. | Use Scenario: Isolated 4–20mA loop receiver converting process variable signals with ±0.1% accuracy over temperature. IC Role / Device Role / Timing Role: Precision ADC accepting bipolar inputs from instrumentation amplifiers, with internal 2.43V reference eliminating drift-sensitive external references. Use Value: ±1LSB INL/DNL and ±45ppm/°C full-scale drift ensure calibrated accuracy remains within spec across industrial temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, high-speed SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7476A (Analog Devices) | 12-bit, 1MSPS, single 2.7–5.25V supply, no internal reference, requires external REF. | Higher speed but lacks integrated reference and bipolar support - needs additional components for same functionality. | Select when maximum throughput >600ksps is required and board space allows external reference + driver. |
| MAX1116 (Maxim Integrated) | 12-bit, 500ksps, internal 2.048V reference, SPI interface, 2.7–3.6V supply only. | Lower supply voltage range and fixed 2.048V reference limit input span flexibility vs LTC1404's 4.096V unipolar / ±2.048V bipolar options. | Select for ultra-low-voltage battery systems where 3.3V operation and smaller package (TDFN-10) are prioritized over dual-supply flexibility. |
Compared with AD7476A and MAX1116, the LTC1404 uniquely combines integrated 2.43V reference, true bipolar/unipolar auto-detection, and sub-100µW Sleep mode - making it optimal for portable, dual-range, low-power measurement systems where component count and thermal budget are critical.
Availability
LTC1404 is available at Aetrix Electronics and suitable for high-speed data acquisition, DSP interface design, and battery-operated instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for LTC1404 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 LTC1404 belongs to ADI's legacy Linear Technology precision data converter family, designed specifically for applications demanding low-power, high-accuracy, and easy-to-integrate analog front-ends in compact form factors.
FAQ
What is the maximum sampling rate supported by the LTC1404?
The LTC1404 supports a maximum sampling rate of 600ksps, achieved with a 9.6MHz external clock. At this rate, conversion time is 1.36µs, and acquisition time is 200ns (unipolar) or 160ns (bipolar). Performance specifications including S/(N+D) and THD are guaranteed across the full operating temperature range at this rate.
Does the LTC1404 require an external reference voltage?
No, the LTC1404 includes a factory-trimmed, temperature-compensated 2.43V internal bandgap reference available at Pin 3 (VREF). It can source up to 1mA and exhibits ±10ppm/°C drift. External reference driving is optional and only needed for span adjustment in bipolar mode, requiring ≥2.46V applied to VREF.
How does the LTC1404 handle unipolar versus bipolar input configurations?
The LTC1404 automatically detects bipolar operation when VSS is driven below GND (e.g., –5V); otherwise it defaults to unipolar mode with VSS tied to GND. Input ranges are 0V–4.096V (unipolar) or ±2.048V (bipolar), both mapped to 12-bit straight-binary output with 1mV/LSB resolution.
What are the power consumption characteristics of the LTC1404 in Nap and Sleep modes?
In Nap mode, the LTC1404 draws 1.3–3.0mA (typical 1.5mA) from VCC and wakes instantly (<350ns) upon CLK activity. In Sleep mode, it consumes 8–20µA (typical 10µA) from VCC and 4–10µA from VSS (bipolar), with 2.5ms VREF wake-up time. Both modes retain register state and require no reinitialization.
Can the LTC1404 interface directly with common microcontrollers?
Yes, the LTC1404 uses a 3-wire SPI/MICROWIRE-compatible interface (CONV, CLK, DOUT) compatible with most MCUs including ARM Cortex-M, PIC, and MSP430 families. No CS pin is required - CONV serves as frame sync, and DOUT is tri-state, allowing multiple devices on shared lines with proper timing control.
DC209A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Number of A/D Converters:
- 1
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 600k
- Data Interface:
- Serial, SPI
- Input Range:
- ±2.048V
- Power (Typ) @ Conditions:
- 75mW @ 600kSPS
- Utilized IC / Part:
- LTC1404
- Contents:
- Board(s)
DC209A FAQ
1.How can I place an order for DC209A through Aetrix?
Please submit a Request for Quotation (RFQ) for DC209A 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 DC209A reliable?
The price and inventory of DC209A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC209A is usually 5 days.
3.What payment methods are accepted for DC209A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC209A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC209A?
DC209A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC209A 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 DC209A?
For technical support, including DC209A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC209A requirements.
6.How does Aetrix verify that DC209A is sourced from the original manufacturer or authorized distributors?
All DC209A 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 DC209A meets industry standards.
7.What is the process for return or replacement of DC209A?
All DC209A units undergo pre-shipment inspection (PSI). If there is an issue with DC209A, 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 DC209A part is unused and in its original packaging.
Return procedure for DC209A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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