My Inquiry
My Account
Analog Devices Inc. LTC1279CSW#PBF
- Part No.:
- LTC1279CSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1279CSW#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,670
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1279CSW#PBF 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 in a 24-pin SO Wide package - used in high-speed data acquisition and DSP interfacing.
For engineers reviewing the LTC1279CSW#PBF datasheet, LTC1279CSW#PBF pinout, LTC1279CSW#PBF application, or LTC1279CSW#PBF equivalent, key selection criteria include guaranteed ±1LSB INL/DNL, 1.4µs conversion time, instant wake-up from shutdown (<350ns), flexible parallel interface timing modes, and internal clock synchronization eliminating external clock jitter sensitivity.
Technical Context
The LTC1279CSW#PBF implements a 12-bit capacitive DAC-based successive approximation register (SAR) architecture with integrated sample-and-hold (160ns acquisition time) and factory-trimmed internal 2.42V bandgap reference. Its internal clock is trimmed to deliver consistent 1.4µs conversion time and automatically synchronizes to each CONVST falling edge.
Digital interface uses asynchronous parallel control with CS/CONVST/RD/BUSY signals supporting Mode 1a, 1b, and 2 timing - enabling direct connection to microprocessors, DSPs, and FIFOs without glue logic. The device features three-state data outputs (D11–D0), high-impedance analog input, and separate analog/digital ground pins (AGND/DGND) for noise isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer function and full-scale code coverage. |
| 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 precision measurement applications. |
| INL / DNL | ±1LSB max - supports accurate DC measurements and low-distortion AC signal reconstruction. |
| Power Dissipation | 60mW typical at 600ksps; drops to 8.5mW in shutdown - reduces thermal load and enables battery-powered operation. |
| Conversion Time | 1.4µs typical - defines minimum throughput interval and determines system latency budget. |
| Reference Output | 2.420V ±20mV, ±10ppm/°C tempco - provides stable scaling for unipolar/bipolar modes without external reference. |
Pinout & Package
Package: 24-lead plastic SO Wide (SW), 0.300" wide body, JEDEC MS-013AC compliant. Thermal resistance θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog Input | High-impedance node accepting 0V–5V (unipolar) or ±2.5V (bipolar); requires <160ns settling after sample hold recharge. |
| VREF (2) | Reference Output | 2.42V buffered output; drives external loads ≤800µA; must be bypassed with 10µF + 0.1µF to AGND. |
| AGND (3) | Analog Ground | Single-point return for analog circuitry; must be isolated from DGND except at package substrate or star ground. |
| D11–D4 (4–11) | Data Outputs (MSB) | Three-state parallel bus outputs; D11 is MSB; active only when CS=LOW and RD=LOW. |
| DGND (12) | Digital Ground | Return for digital I/O; connected internally to substrate but kept separate from AGND externally. |
| D3–D0 (13–16) | Data Outputs (LSB) | Completes 12-bit parallel word; D0 is LSB; same timing and drive strength as D11–D4. |
| DVDD (17) | Digital Supply | +5V supply for digital core and output drivers; tied to AVDD in standard layout. |
| SHDN (18) | Shutdown Control | Active-low input; pulls IDD to 1.7mA and stops conversions; wake-up delay ≤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 during BUSY=HIGH; data valid t8 = 35–170ns after RD↓. |
| CS (21) | Chip Select | Active-low enable for CONVST and RD recognition; required for all digital interface operations. |
| BUSY (22) | Status Indicator | Open-drain active-low output; LOW during conversion; rises before data is valid. |
| VSS (23) | Negative Supply | –5V for bipolar mode; tied to AGND for unipolar; bypass with 0.1µF ceramic to AGND. |
| AVDD (24) | Analog Supply | +5V for analog core and reference; bypassed with 10µF tantalum + 0.1µF ceramic to AGND. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronized clock | Eliminates external clock routing, jitter coupling, and phase alignment issues - simplifies PCB layout and improves SNR stability. |
| Instant wake-up from shutdown | 350ns max SHDN↑ to CONVST↓ readiness - allows dynamic power gating between samples without throughput penalty. |
| Flexible parallel interface timing | Supports Mode 1a/1b/2 with programmable setup/hold windows - enables reliable handshaking with diverse µP/DSP buses. |
| Overdrivable reference pin | VREF accepts external 2.45V–4.8V references - permits input span adjustment and improved temperature drift (e.g., LT1019A-2.5). |
| Separate AGND/DGND pins | Enables split-ground partitioning - critical for maintaining >70dB AC performance in mixed-signal systems. |
Applications
| High-Speed Data Acquisition | Digital Signal Processing |
|---|---|
Use Scenario: Simultaneous sampling of multiple sensor channels (e.g., vibration, pressure, temperature) in industrial PLCs or test equipment. IC Role / Device Role / Timing Role: Primary ADC capturing 12-bit samples at 600ksps with deterministic latency; interfaces directly to FPGA FIFO via parallel bus. Use Value: Guaranteed ±1LSB linearity and 70dB S/(N+D) ensure accurate waveform reconstruction up to 300kHz without post-processing correction. | Use Scenario: Real-time front-end digitization for audio codecs, telecom baseband processing, or radar pulse analysis. IC Role / Device Role / Timing Role: High-fidelity analog-to-digital conversion stage feeding TI C6000 or ADI SHARC DSPs via dedicated parallel port. Use Value: Internal clock synchronization prevents aliasing from asynchronous clock domain crossing, preserving FFT spectral integrity. |
| Multiplexed Data Acquisition Systems | Audio and Telecom Processing |
Use Scenario: Channel-scanning in automated test equipment (ATE) where 16-channel analog inputs are sequentially sampled. IC Role / Device Role / Timing Role: Central ADC shared across multiplexer outputs; powered down between channel reads using SHDN to minimize average power. Use Value: 8.5mW shutdown power and 350ns wake-up allow >90% duty-cycle reduction in multi-channel systems without sacrificing speed. | Use Scenario: Digitizing voice-band signals (300Hz–3.4kHz) or wideband IF signals (up to 100kHz) in VoIP gateways or software-defined radios. IC Role / Device Role / Timing Role: Precision ADC providing 12-bit resolution and low THD (–78dB) for clean signal capture prior to digital filtering or modulation. Use Value: Full linear bandwidth of 500kHz and 74dB THD at Nyquist support high-SNR audio encoding and narrowband spectral analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, 600ksps SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7V–5.25V supply; SPI interface; 200ksps max; no internal reference; 10-bit resolution | Lower speed and resolution; suited for portable, low-power embedded systems with serial interface constraints | Select only if SPI interface and lower cost outweigh need for 12-bit accuracy and 600ksps throughput. |
| MAX1166BCAP+ | 2.7V–5.25V supply; parallel interface; 500ksps max; internal 2.048V ref; ±1LSB INL | Slightly lower sampling rate; different reference voltage limits unipolar range to 0–4.096V unless scaled | Consider when 500ksps suffices and board space favors 20-pin TSSOP over 24-pin SO Wide. |
Compared with ADS7822U and MAX1166BCAP+, the LTC1279CSW#PBF offers higher resolution (12-bit vs 10/12-bit), faster sampling (600ksps vs 200/500ksps), and tighter AC specs (70dB S/(N+D) vs ~65dB), making it optimal for demanding instrumentation and DSP front-ends where precision and speed are co-critical.
Availability
LTC1279CSW#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition, digital signal processing, and multiplexed instrumentation systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1279CSW#PBF 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 LTC1279CSW#PBF belongs to Linear Technology's legacy precision data acquisition product line, designed specifically for applications demanding high-speed, low-power, and easy-to-interface 12-bit SAR ADCs with integrated references and clocks.
FAQ
What is the operating temperature range for the LTC1279CSW#PBF?
The LTC1279CSW#PBF is rated for commercial temperature operation from 0°C to 70°C. This is indicated by the "C" suffix in the part number. For industrial-grade operation (–40°C to +85°C), the LTC1279ISW variant is specified. The LTC1279CSW#PBF's thermal resistance (θJA = 130°C/W) and 60mW typical power dissipation support reliable operation within this range when properly heatsinked.
Does the LTC1279CSW#PBF require an external clock source?
No, the LTC1279CSW#PBF does not require an external clock. It includes an internally trimmed clock that automatically synchronizes to each CONVST falling edge, delivering a consistent 1.4µs conversion time. This eliminates clock routing, jitter sensitivity, and external component count - a key advantage over competing ADCs requiring asynchronous clock management.
Can the LTC1279CSW#PBF operate with a single 5V supply in bipolar mode?
No, the LTC1279CSW#PBF cannot operate in true bipolar mode (±2.5V input) with only a single 5V supply. Bipolar operation requires both AVDD = +5V and VSS = –5V. If only a single 5V rail is available, the device must be configured for unipolar mode (0V–5V input), which uses VSS tied to AGND. Attempting bipolar operation without negative supply violates absolute maximum ratings and causes undefined behavior.
What is the purpose of the SHDN pin on the LTC1279CSW#PBF, and how fast does it wake up?
The SHDN pin on the LTC1279CSW#PBF is an active-low input that places the ADC into ultra-low-power shutdown mode (8.5mW typical). Upon deassertion (SHDN↑), the device achieves full operational readiness - including internal reference stabilization and clock resynchronization - within 350ns, allowing immediate CONVST triggering. This enables aggressive power cycling between conversions without throughput loss.
How is the reference voltage used in the LTC1279CSW#PBF, and can it be overdriven?
The LTC1279CSW#PBF features an internal 2.42V bandgap reference accessible at VREF (Pin 2), used to set the full-scale input range (0–5V unipolar or ±2.5V bipolar). The VREF pin can be overdriven with an external reference (2.45V–4.8V) to adjust input span or improve drift performance (e.g., using LT1019A-2.5). Driving below 2.45V risks conflict with the internal reference and code loss.
LTC1279CSW#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1279CSW#PBF FAQ
1.How can I place an order for LTC1279CSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1279CSW#PBF 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 LTC1279CSW#PBF reliable?
The price and inventory of LTC1279CSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1279CSW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1279CSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1279CSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1279CSW#PBF?
LTC1279CSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1279CSW#PBF 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 LTC1279CSW#PBF?
For technical support, including LTC1279CSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1279CSW#PBF requirements.
6.How does Aetrix verify that LTC1279CSW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1279CSW#PBF 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 LTC1279CSW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1279CSW#PBF?
All LTC1279CSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1279CSW#PBF, 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 LTC1279CSW#PBF part is unused and in its original packaging.
Return procedure for LTC1279CSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1279CSW#PBF Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
