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Analog Devices Inc. LTC1279ISW#TRPBF
- Part No.:
- LTC1279ISW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1279ISW#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,809
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Product details
Overview
LTC1279ISW#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 600ksps successive-approximation ADC with internal reference, synchronized clock, and power shutdown. It operates from single 5V or ±5V supplies, delivers 70dB S/(N+D) at 100kHz, consumes 60mW typical, and supports unipolar (0V–5V) or bipolar (±2.5V) input ranges - used in high-speed data acquisition and DSP interfacing.
For engineers reviewing the LTC1279ISW#TRPBF datasheet, LTC1279ISW#TRPBF pinout, LTC1279ISW#TRPBF application, or LTC1279ISW#TRPBF equivalent, key selection criteria include guaranteed ±1LSB INL/DNL, 1.4µs conversion time, 24-pin SO Wide package compatibility, and flexible parallel interface timing for FIFO/microprocessor synchronization.
Technical Context
The LTC1279ISW#TRPBF implements a 12-bit capacitive DAC-based successive approximation architecture with integrated sample-and-hold (160ns acquisition), factory-trimmed internal clock (1.4µs conversion), and on-chip 2.42V bandgap reference. Its control logic accepts active-low CONVST and CS inputs, asserts BUSY during conversion, and outputs three-state parallel data (D11–D0).
It supports dual supply modes: unipolar (AVDD = DVDD = 5V, VSS tied to AGND) and bipolar (AVDD = DVDD = 5V, VSS = –5V), with separate analog/digital ground pins (AGND, DGND) and independent analog/digital power rails (AVDD, DVDD) to minimize noise coupling. Input leakage is ±1µA, and analog input capacitance is 25pF in sample mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer and full-scale code coverage for precision measurement. |
| Sampling Rate | 600ksps maximum - enables real-time capture of signals up to 300kHz Nyquist bandwidth. |
| S/(N + D) | 70dB at 100kHz input - ensures ≥11.3 effective bits for high-fidelity signal digitization in spectral analysis. |
| INL / DNL | ±1LSB max - maintains linearity critical for calibration-sensitive applications like instrumentation and telecom. |
| Power Dissipation | 60mW typ at 600ksps; 8.5mW in shutdown - allows thermal-constrained embedded designs with instant wake-up (350ns). |
| Analog Input Range | 0V to 5V (unipolar) or ±2.5V (bipolar) - configurable via supply configuration without external level-shifting. |
| Reference Output | 2.420V ±20mV, ±10ppm/°C tempco - stable internal reference usable as system reference or overdriven externally. |
Pinout & Package
Package: 24-lead plastic SO Wide (SW), 0.300" wide body, JEDEC MS-013AC compliant. Thermal resistance θJA = 130°C/W; operating temperature range –40°C to +85°C (Industrial grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog Input | High-impedance node accepting 0V–5V (unipolar) or ±2.5V (bipolar); 25pF input capacitance in sample mode. |
| VREF (2) | Reference Output | 2.42V buffered output; supplies DAC and can drive ≤800µA load; decoupling required (10µF + 0.1µF). |
| AGND (3) | Analog Ground | Single-point analog return; must be isolated from DGND except at star point to prevent digital noise injection. |
| D11–D4 (4–11) | Data Outputs (MSB-first) | Three-state parallel bus outputs; D11 is MSB; high-Z when CS high or RD low. |
| DGND (12) | Digital Ground | Digital return path; connected to AGND only at designated star point per layout guidelines. |
| D3–D0 (13–16) | Data Outputs (LSB) | Completes 12-bit parallel word; D0 is LSB; timing-critical for t8 (data access: 35–170ns). |
| DVDD (17) | Digital Supply | +5V digital rail; tied to AVDD; powers logic and output drivers; bypassing required. |
| SHDN (18) | Shutdown Control | Active-low input; reduces current to 1.7mA and power to 8.5mW; wake-up time 350ns. |
| CONVST (19) | Conversion Start | Falling-edge triggered; initiates SAR cycle only when CS = low; minimum pulse width 40ns. |
| RD (20) | Read Strobe | Active-low; enables output drivers when CS = low; controls data validity window relative to BUSY. |
| CS (21) | Chip Select | Active-low enable for CONVST and RD recognition; must be asserted before CONVST edge. |
| BUSY (22) | Status Output | Active-low open-drain signal indicating conversion in progress; synchronizes host read timing. |
| VSS (23) | Negative Supply | –5V for bipolar operation; tied to AGND for unipolar; requires 0.1µF ceramic bypass to AGND. |
| AVDD (24) | Analog Supply | +5V analog rail; powers sample-and-hold and comparator; bypassed with 10µF + 0.1µF to AGND. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronized clock | Eliminates external clock routing and asynchronous jitter; auto-synchronizes to each CONVST edge. |
| Flexible parallel interface | Supports Mode 1/2 timing for direct connection to microprocessors, DSPs, and FIFOs without glue logic. |
| Instant wake-up from shutdown | 350ns recovery enables dynamic power gating between conversions - critical for battery-powered DAQ. |
| Overdrivable internal reference | VREF pin accepts external 2.45V–4.8V reference to adjust input span in bipolar mode without losing accuracy. |
| Separate analog/digital grounds | AGND and DGND pins enable PCB-level isolation - essential for maintaining 70dB AC performance. |
| High-impedance analog input | ±1µA leakage and 25pF capacitance allow direct connection to op-amps (e.g., LT1360, LT1220) without buffering. |
Applications
| High-Speed Data Acquisition | Digital Signal Processing |
|---|---|
|
Use Scenario: Real-time capture of sensor outputs (e.g., vibration, strain) at 600ksps for FFT-based spectral analysis. IC Role / Device Role / Timing Role: Primary sampling front-end; provides 12-bit parallel data synchronized to CONVST/BUSY for DMA-driven memory storage. Use Value: 70dB S/(N+D) at 100kHz and ±1LSB linearity ensure accurate amplitude/frequency resolution in industrial condition monitoring. |
Use Scenario: Digitizing audio or telecom baseband signals feeding TI C6000 or Analog Devices SHARC processors. IC Role / Device Role / Timing Role: Parallel-output ADC interfaced directly to DSP external memory bus using Mode 2 timing (RD/BUSY handshake). Use Value: Flexible 0V–5V/±2.5V input range and 1.4µs conversion support multi-format signal conditioning without level-shifters. |
| Multiplexed Data Acquisition Systems | Spectrum Analysis |
|
Use Scenario: 16-channel thermocouple/data logger using analog multiplexer (e.g., ADG1208) switching into LTC1279ISW#TRPBF. IC Role / Device Role / Timing Role: Shared ADC resource; SHDN pin powers down between channel reads to reduce system power by >85%. Use Value: 8.5mW shutdown power and 350ns wake-up enable rapid channel cycling while maintaining overall system efficiency. |
Use Scenario: RF receiver IF sampling stage capturing 200kHz–300kHz bandwidth signals for real-time spectrum display. IC Role / Device Role / Timing Role: High-SFDR digitizer; full-power bandwidth of 5MHz and 74dB THD at Nyquist preserve harmonic integrity. Use Value: 78dB THD at 100kHz and –81dB IMD (2nd order) enable clean detection of weak signals adjacent to strong interferers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, 600ksps parallel-output ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7892BRZ-1 | 12-bit, 600ksps, single 5V supply only; no internal reference; requires external REF; 28-lead SOIC. | Unipolar-only operation; lacks bipolar mode and internal VREF - needs external 2.5V reference and level-shifting for ±2.5V inputs. | Select when board space allows larger package and external reference design is already established. |
| MAX1167BCAP+ | 12-bit, 500ksps, internal reference; SPI interface; 20-pin TSSOP; lower power (35mW). | Serial interface replaces parallel bus - reduces pin count but increases host processor overhead and latency. | Select for space-constrained designs where SPI integration simplifies routing and reduces FPGA I/O usage. |
Compared with AD7892BRZ-1 and MAX1167BCAP+, the LTC1279ISW#TRPBF uniquely combines internal reference, bipolar/unipolar flexibility, parallel interface, and guaranteed ±1LSB linearity - making it optimal for high-accuracy, mixed-mode DAQ systems requiring minimal external components and deterministic timing.
Availability
LTC1279ISW#TRPBF is available at Aetrix Electronics and suitable for high-speed data acquisition, digital signal processing, and spectrum analysis requiring stable component supply across industrial temperature ranges.
Supply support for LTC1279ISW#TRPBF 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 industrial, automotive, communications, and healthcare markets.
The LTC1279ISW#TRPBF belongs to ADI's legacy Linear Technology precision data converter family, designed specifically for high-speed, low-power, easy-to-use 12-bit sampling applications in instrumentation and real-time signal processing.
FAQ
What is the operating temperature range for the LTC1279ISW#TRPBF?
The LTC1279ISW#TRPBF is an Industrial-grade part rated for –40°C to +85°C ambient operation. This is confirmed in the Absolute Maximum Ratings table and applies to all DC and AC specifications unless otherwise noted. The device features internal thermal protection and maintains ±1LSB INL/DNL across this full range.
Does the LTC1279ISW#TRPBF require an external clock source?
No, the LTC1279ISW#TRPBF does not require an external clock. It contains an internally trimmed oscillator synchronized automatically to each CONVST falling edge, eliminating clock routing noise and simplifying system design. The typical conversion time is fixed at 1.4µs, enabling deterministic timing without external timing components.
Can the LTC1279ISW#TRPBF operate in both unipolar and bipolar modes?
Yes, the LTC1279ISW#TRPBF supports both modes: unipolar (0V to 5V input) with AVDD = DVDD = 5V and VSS tied to AGND; bipolar (±2.5V input) with AVDD = DVDD = 5V and VSS = –5V. The input range, offset error, and reference behavior are explicitly specified for both configurations in the datasheet.
What is the purpose of the SHDN pin on the LTC1279ISW#TRPBF?
The SHDN pin on the LTC1279ISW#TRPBF is an active-low power shutdown control. When pulled low, it reduces supply current to 1.7mA and power dissipation to 8.5mW. The device wakes up in 350ns, allowing rapid power cycling between conversions - ideal for battery-powered or thermally constrained high-throughput DAQ systems.
How is the reference voltage handled in the LTC1279ISW#TRPBF?
The LTC1279ISW#TRPBF integrates a factory-trimmed 2.42V bandgap reference available at VREF (Pin 2). It can be used as-is (with 10µF + 0.1µF bypassing) or overdriven externally between 2.45V and 4.8V to adjust input span in bipolar mode. Driving below 2.45V risks conflict with the internal reference and code loss.
LTC1279ISW#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 600k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V, -2.45V ~ 5.25
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1279ISW#TRPBF FAQ
1.How can I place an order for LTC1279ISW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1279ISW#TRPBF 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 LTC1279ISW#TRPBF reliable?
The price and inventory of LTC1279ISW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1279ISW#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1279ISW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1279ISW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1279ISW#TRPBF?
LTC1279ISW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1279ISW#TRPBF 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 LTC1279ISW#TRPBF?
For technical support, including LTC1279ISW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1279ISW#TRPBF requirements.
6.How does Aetrix verify that LTC1279ISW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1279ISW#TRPBF 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 LTC1279ISW#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1279ISW#TRPBF?
All LTC1279ISW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1279ISW#TRPBF, 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 LTC1279ISW#TRPBF part is unused and in its original packaging.
Return procedure for LTC1279ISW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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