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Analog Devices Inc. DC2789A-A
- Part No.:
- DC2789A-A
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC2789A-A.pdf
- Description:
- EVAL BOARD FOR LTC1661
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Product details
Overview
LTC1661 from Analog Devices (acquired Linear Technology) is a dual 10-bit serial-input rail-to-rail voltage-output DAC in an 8-lead MSOP package, delivering ±0.75LSB DNL, 2.7V–5.5V supply operation, and 60µA per DAC active current. It integrates two independent buffered DACs with double-buffered input logic, enabling simultaneous or independent updates - ideal for precision biasing in ATE pin drivers and portable instrumentation.
For engineers reviewing the LTC1661 datasheet, LTC1661 pinout, LTC1661 application, or LTC1661 equivalent, this page delivers verified specifications, validated MSOP pin mapping, confirmed rail-to-rail output behavior up to 1000pF load, and two field-tested alternative DACs for battery-powered and industrial calibration systems.
Technical Context
The LTC1661 employs Linear Technology's proprietary voltage interpolation architecture to guarantee monotonicity and ≤±0.75LSB DNL across its full 0–1023 code range. Its dual-latch structure separates input register loading from DAC register updating, allowing sleep-mode retention while preloading new codes.
Each DAC features rail-to-rail output amplifiers capable of sourcing/sinking ≥5mA at VCC = 5V, stable into 1000pF, with constant 260kΩ reference input impedance eliminating external buffer requirements. Sleep mode reduces total ICC to 1µA while preserving DAC register contents.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output levels with 4mV/LSB step at VREF = 4.096V |
| Differential Nonlinearity | ≤±0.75LSB max - ensures monotonic transfer function critical for closed-loop control |
| Supply Current (per DAC) | 60µA typical at VCC = 5V - enables multi-DAC integration in ultra-low-power battery systems |
| Sleep Mode Current | 1µA total - extends shelf life and runtime in intermittently active instrumentation |
| Reference Input Impedance | 260kΩ typ - eliminates need for op-amp buffer when using resistive divider references |
| Capacitive Load Drive | 1000pF - supports direct connection to ADC input caps, filter networks, and long PCB traces |
| Serial Interface | 3-wire SPI-compatible (CS/LD, SCK, DIN) with Schmitt-trigger inputs - tolerates noisy digital environments |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3.0mm × 3.0mm × 0.86mm body, 0.65mm pitch, exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CS/LD | Chip Select / Load Control | Active-low serial interface enable; rising edge triggers DAC update or sleep/wake action per control code |
| 2 - SCK | Serial Clock Input | CMOS/TTL-compatible clock; data shifted on rising edge; max 10MHz (full temp range) |
| 3 - DIN | Serial Data Input | 16-bit word: 4-bit control code + 10-bit DAC code + 2 don't-care bits; MSB-first |
| 4 - REF | Reference Voltage Input | 0V to VCC range; 260kΩ constant impedance; sets full-scale output as VOUT = (k/1024)×VREF |
| 5 - VOUT B | DAC B Analog Output | Rail-to-rail voltage source/sink; drives ≥5mA; stable into 1000pF; high-Z in sleep mode |
| 6 - VCC | Positive Supply | 2.7V–5.5V operation; must exceed REF by ≥0.3V to avoid absolute max violation |
| 7 - GND | Analog/Digital Ground | Single ground plane required; decoupling capacitor (0.1µF) placed adjacent to Pin 6 and Pin 7 |
| 8 - VOUT A | DAC A Analog Output | Functionally identical to Pin 5; independent output path with simultaneous update capability |
Key Features
| Feature | Design Value |
|---|---|
| Double-buffered input logic | Enables glitch-free simultaneous DAC A/B updates without interrupting sleep mode or disturbing active outputs |
| Rail-to-rail output stage | Swings within millivolts of GND and VCC at no load; maintains linearity while sourcing/sinking ≥5mA |
| Constant-impedance REF input | 260kΩ over all codes eliminates external op-amp buffer, reducing BOM count and layout area |
| Power-on reset | Forces both DAC outputs to zero scale at power-up - ensures deterministic system initialization |
| 1µA sleep mode | Retains DAC register values while cutting supply current >98% - critical for energy harvesting nodes |
Applications
| ATE Pin Driver Biasing | Digitally Controlled Amplifier Gain |
|---|---|
Use Scenario: Precision adjustment of VH/VL levels in automated test equipment pin electronics, where sub-mV stability and fast settling are mandatory. IC Role / Device Role / Timing Role: Dual DAC provides independent, synchronized DC bias voltages for driver high-side and low-side rails. Use Value: ±250mV adjustment range with 500µV step resolution enables fine-grained margin testing without external scaling resistors. |
Use Scenario: Setting gain-control voltage for programmable-gain amplifiers in portable medical sensors and audio front-ends. IC Role / Device Role / Timing Role: LTC1661 generates stable, low-noise analog control voltage directly from microcontroller SPI bus. Use Value: 60µA per DAC and rail-to-rail output eliminate need for level-shifting or external buffers, reducing power and component count. |
| Portable Battery-Powered Instrumentation | Remote Industrial Calibration |
Use Scenario: Generating calibrated reference voltages in handheld multimeters and sensor calibrators operating from single Li-ion cells. IC Role / Device Role / Timing Role: Dual DAC supplies ratiometric 0–VCC outputs using internal VCC as reference, eliminating external precision reference IC. Use Value: 2.7V minimum supply and 1µA sleep current extend battery life beyond 12 months in low-duty-cycle logging modes. |
Use Scenario: Field-deployable calibration modules that adjust sensor excitation or offset in harsh industrial environments. IC Role / Device Role / Timing Role: LTC1661 provides stable, temperature-compensated bias points immune to supply ripple due to inherent PSR of 0.18 LSB/V. Use Value: Wide –40°C to 85°C operating range (I-grade) and guaranteed INL ≤±2LSB ensure accuracy across thermal cycling without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1446 | 12-bit resolution, integrated 4.096V reference, SO-8 package, higher ICC (120µA) | Requires no external reference but occupies 2.5× board area; better for fixed-reference systems needing higher resolution | Select LTC1446 when 12-bit accuracy and reference integration outweigh size/power penalties |
| LTC1663 | Single 10-bit DAC, SOT-23-6 package, same 60µA ICC, no simultaneous update capability | Half the channel count; lacks dual-latch architecture - unsuitable for synchronized A/B biasing | Select LTC1663 only for space-constrained single-channel applications where independent DAC updates are unnecessary |
Compared with LTC1446 and LTC1663, the LTC1661 uniquely balances dual-channel functionality, micropower operation, MSOP footprint, and true simultaneous update - making it the only option for compact, battery-operated systems requiring coordinated dual-voltage generation without reference ICs.
Availability
LTC1661 is available at Aetrix Electronics and suitable for ATE pin driver design, portable instrumentation, remote industrial calibration, and digitally controlled amplifier systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1661 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, formed through the acquisition of Linear Technology in 2017.
The LTC1661 belongs to Linear Technology's precision DAC product line, engineered specifically for low-power, space-constrained applications demanding rail-to-rail output, guaranteed monotonicity, and robust serial interface operation in battery-powered and industrial environments.
FAQ
What is the maximum capacitive load the LTC1661 can drive without external compensation?
The LTC1661 is specified to drive up to 1000pF capacitive load stably, as confirmed in the Electrical Characteristics table and Typical Performance section. This capability allows direct connection to ADC input capacitors, RC filters, and long PCB traces without series resistance or op-amp buffering - a key advantage for compact ATE and portable instrument designs using the LTC1661.
Does the LTC1661 support true simultaneous update of both DAC outputs?
Yes - the LTC1661's double-buffered architecture enables true simultaneous update via control code 1000b (wake + update both DACs) or 1111b (load both + wake + update). Unlike single-buffered DACs, this prevents output glitches during coordinated biasing tasks, such as setting complementary VH/VL levels in pin drivers - a core capability verified in the Operation section and Table 2 of the LTC1661 datasheet.
Can the LTC1661 use VCC as its reference voltage?
Yes - the REF pin accepts 0V to VCC, enabling ratiometric operation where VOUT = (k/1024) × VCC. This eliminates the need for an external precision reference in systems where supply regulation meets accuracy requirements, as explicitly supported in the Features list ("Reference Range Includes Supply for Ratiometric 0V-to-VCC Output") and confirmed in Absolute Maximum Ratings and Electrical Characteristics.
What is the guaranteed differential nonlinearity (DNL) specification for the LTC1661 over temperature?
The LTC1661 guarantees DNL ≤ ±0.75LSB maximum across its full operating temperature range (–40°C to 85°C for I-grade), as stated in the Electrical Characteristics table under "DNL Differential Nonlinearity" with the "l" symbol denoting full-range specification. This ensures monotonic behavior in industrial and automotive-adjacent applications where thermal drift could otherwise cause code skipping.
How does the LTC1661 handle power-on initialization?
The LTC1661 incorporates a built-in power-on reset circuit that forces both DAC outputs to zero scale (code 0) upon initial power application, ensuring repeatable and deterministic startup behavior. This feature is documented in the Operation section and eliminates the need for external reset sequencing or firmware initialization routines - a critical reliability factor in unattended instrumentation using the LTC1661.
DC2789A-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Number of DAC's:
- 2
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- -
- Data Interface:
- Serial, SPI
- Settling Time:
- 30 µs
- DAC Type:
- -
- Utilized IC / Part:
- LTC1661
- Contents:
- Board(s)
DC2789A-A FAQ
1.How can I place an order for DC2789A-A through Aetrix?
Please submit a Request for Quotation (RFQ) for DC2789A-A 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 DC2789A-A reliable?
The price and inventory of DC2789A-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC2789A-A is usually 5 days.
3.What payment methods are accepted for DC2789A-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC2789A-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC2789A-A?
DC2789A-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC2789A-A 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 DC2789A-A?
For technical support, including DC2789A-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC2789A-A requirements.
6.How does Aetrix verify that DC2789A-A is sourced from the original manufacturer or authorized distributors?
All DC2789A-A 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 DC2789A-A meets industry standards.
7.What is the process for return or replacement of DC2789A-A?
All DC2789A-A units undergo pre-shipment inspection (PSI). If there is an issue with DC2789A-A, 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 DC2789A-A part is unused and in its original packaging.
Return procedure for DC2789A-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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