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Analog Devices Inc. LTC1276BCSW#PBF
- Part No.:
- LTC1276BCSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1276BCSW#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,036
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Product details
Overview
LTC1276BCSW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 300ksps successive-approximation ADC with ±5V bipolar input range, on-chip 2.42V reference, internal synchronized clock, and 24-pin SO Wide package. It draws 75mW typical power, achieves ±1/2LSB INL and ±3/4LSB DNL (B-grade), and delivers 70dB S/(N+D) at 150kHz Nyquist frequency. It targets high-speed data acquisition in industrial instrumentation requiring stable DC accuracy and low distortion.
For engineers reviewing the LTC1276BCSW#PBF datasheet, LTC1276BCSW#PBF pinout, LTC1276BCSW#PBF application, or LTC1276BCSW#PBF equivalent, this page provides verified specifications, validated pin functions, confirmed bipolar timing behavior, real-world interface constraints for microprocessor/DSP parallel bus integration, and documented alternatives with known functional trade-offs.
Technical Context
The LTC1276BCSW#PBF implements a 12-bit capacitive DAC-based successive approximation register (SAR) architecture with integrated sample-and-hold and factory-trimmed internal clock (2.7µs max conversion time). Its analog front-end supports ±5V input via dual supplies (VDD = +5V, VSS = –5V), with high-impedance AIN and on-chip 25ppm/°C reference.
Digital interface uses active-low CS and RD with HBEN-controlled 8-bit/12-bit multiplexing, BUSY status signaling, and three-state parallel outputs (D11–D0/8). Timing requires no external clock synchronization due to internal clock auto-synchronization on each RD assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes; guarantees monotonic transfer and full-scale digital word representation. |
| Sampling Rate | 300ksps maximum; enables real-time capture of signals up to 150kHz Nyquist bandwidth. |
| Analog Input Range | ±5V bipolar; requires VDD = +4.95V to +5.25V and VSS = –4.95V to –5.25V for specified accuracy. |
| S/(N + D) Ratio | 70dB at 150kHz input; corresponds to ~11.3 effective bits for spectral analysis applications. |
| INL / DNL | ±1/2LSB max integral linearity and ±3/4LSB max differential linearity (B-grade, 0°C to 70°C). |
| Reference Voltage | 2.420V ±20mV output with ±5ppm/°C tempco; supports up to 1mA load and requires 10µF + 0.1µF bypassing. |
| Power Dissipation | 75mW typical at 300ksps; enables thermally constrained embedded designs without forced cooling. |
Pinout & Package
Package: 24-lead plastic SO Wide (SW), 0.300" wide body, RoHS-compliant lead-free (PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog Input | ±5V bipolar input node; high-impedance (50pF in sample mode); must stay within VSS–0.05V to VDD+0.05V. |
| VREF (2) | Reference Output | 2.42V precision reference; drives internal DAC and external loads ≤1mA; requires local decoupling. |
| AGND (3) | Analog Ground | Return for analog circuitry; must be tied to DGND at single point to minimize noise coupling. |
| D11–D4 (4–11) | Data Outputs | Three-state MSB-aligned parallel outputs; active when CS and RD low; high-impedance when CS high. |
| DGND (12) | Digital Ground | Return for digital I/O; separate from AGND but connected at system star point. |
| D3/11–D0/8 (13–16) | Data Outputs | Lower byte outputs; multiplexed with upper nibble when HBEN = HIGH for 8-bit read mode. |
| NC (17,18) | No Connection | Unbonded pins; must remain unconnected per datasheet. |
| HBEN (19) | High-Byte Enable | Controls 12-bit vs 8-bit output format; disables conversion start when HIGH. |
| RD (20) | Read Input | Active-low signal that initiates conversion when CS and HBEN are low; enables output drivers. |
| CS (21) | Chip Select | Active-low enable for all control inputs; must be asserted before RD to activate interface logic. |
| BUSY (22) | Status Output | Active-low open-drain indicator; goes low at conversion start and returns high after data valid. |
| VSS (23) | Negative Supply | –5V supply rail for bipolar operation; bypass to AGND with 0.1µF ceramic capacitor. |
| VDD (24) | Positive Supply | +5V supply rail; bypass to AGND with 10µF tantalum + 0.1µF ceramic for low-noise operation. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronized Clock | Eliminates external clock routing and jitter concerns; auto-synchronizes to each RD command for deterministic timing. |
| On-Chip 2.42V Reference | Reduces BOM count and layout complexity; ±5ppm/°C tempco ensures <±0.5LSB drift over 0°C–70°C. |
| High-Impedance Analog Input | 50pF input capacitance in sample mode allows direct connection to low-output-impedance op amps (e.g., LT1220) without RC filtering. |
| ESD Protection on All Pins | Withstands >2kV HBM per JEDEC JESD22-A114; enables robust handling in manufacturing and field environments. |
| Parallel 12-Bit Interface | Supports direct connection to 8-bit or 16-bit microprocessors/DSPs via HBEN-controlled byte multiplexing and BUSY handshaking. |
Applications
| Industrial Data Acquisition | Audio Signal Digitization |
|---|---|
Use Scenario: High-channel-count PLC analog input modules acquiring sensor signals (thermocouples, strain gauges) at 300ksps aggregate rate. IC Role / Device Role / Timing Role: Primary SAR ADC converting ±5V field signals with DC-coupled accuracy and low THD for post-processing FFT analysis. Use Value: ±1/2LSB INL ensures <0.012% full-scale linearity error across temperature; 70dB S/(N+D) preserves dynamic range for multi-tone spectral monitoring. | Use Scenario: Digitizing line-level audio (±2.5V to ±5V range) in professional audio interfaces prior to DSP-based compression or equalization. IC Role / Device Role / Timing Role: Bipolar-input ADC capturing baseband audio with minimal harmonic distortion and no external reference required. Use Value: 77dB THD at Nyquist enables clean 16-bit-equivalent audio fidelity; internal clock eliminates jitter-sensitive external oscillator design. |
| Spectrum Analyzer Front-End | Multiplexed Sensor Monitoring |
Use Scenario: Real-time RF spectrum analysis where undersampling of >1MHz IF signals occurs at 300ksps with alias rejection. IC Role / Device Role / Timing Role: High-linearity ADC enabling accurate amplitude measurement of aliased tones up to 2MHz input frequency. Use Value: Full linear bandwidth of 200kHz and flat S/(N+D) response support ENOB >11 bits even at 100kHz input, critical for resolution bandwidth accuracy. | Use Scenario: Multi-sensor environmental monitoring (voltage, current, temperature) using analog multiplexer feeding single ADC channel. IC Role / Device Role / Timing Role: Low-power, self-contained ADC minimizing external components while maintaining ±5V input flexibility across sensor types. Use Value: 75mW power dissipation allows dense channel packing; on-chip reference removes need for external voltage reference ICs and associated PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7800U | 12-bit, 100ksps, ±10V input range, external reference required, 28-pin SOIC package. | Lower sampling rate limits real-time waveform capture; wider input range suits legacy industrial sensors but increases noise susceptibility. | Select when ±10V legacy sensor compatibility outweighs speed requirement and board space permits external reference design. |
| MAX1166BCPP+ | 12-bit, 250ksps, ±5V input, internal reference, 28-pin PDIP/SO package, SPI interface instead of parallel. | Serial interface reduces pin count but adds software overhead; slightly lower throughput impacts high-channel-density systems. | Select when microcontroller GPIO count is constrained and firmware can accommodate SPI timing overhead over parallel bus latency. |
Compared with ADS7800U and MAX1166BCPP+, the LTC1276BCSW#PBF offers the highest sampling rate (300ksps) in a 24-pin SO package with integrated reference and parallel interface-enabling faster data throughput and simpler hardware integration for time-critical acquisition systems.
Availability
LTC1276BCSW#PBF is available at Aetrix Electronics and suitable for industrial instrumentation, audio digitization, spectrum analysis, and multiplexed sensor monitoring requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC1276BCSW#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 LTC1276BCSW#PBF belongs to Linear Technology's legacy high-speed precision SAR ADC family, designed specifically for applications demanding both DC accuracy (low INL/DNL) and AC performance (high S/(N+D), low THD) in compact, self-contained packages.
FAQ
What is the operating temperature range for the LTC1276BCSW#PBF?
The LTC1276BCSW#PBF is rated for commercial operation from 0°C to 70°C (B-grade). This range is explicitly defined in the Absolute Maximum Ratings table and applies to all DC and AC specifications including ±1/2LSB INL, ±3/4LSB DNL, and 70dB S/(N+D) at Nyquist. Operation outside this range may degrade performance or violate reliability limits.
Does the LTC1276BCSW#PBF require an external clock source?
No, the LTC1276BCSW#PBF does not require an external clock. It features an internally trimmed clock with 2.7µs maximum conversion time that automatically synchronizes to each RD assertion. This eliminates clock routing, jitter sensitivity, and external oscillator BOM cost-confirmed in the Features section and Timing Characteristics tables.
Can the LTC1276BCSW#PBF operate with a single 5V supply?
No, the LTC1276BCSW#PBF requires dual supplies: +5V on VDD (Pin 24) and –5V on VSS (Pin 23) to support its ±5V analog input range. The datasheet specifies absolute maximum VSS = –6V and minimum operating VSS = –4.95V. Single-supply operation is only supported by the LTC1273 variant (0V to 5V input).
What is the purpose of the HBEN pin on the LTC1276BCSW#PBF?
The HBEN (High Byte Enable) pin on the LTC1276BCSW#PBF controls data bus formatting: when LOW, all 12 bits appear on D11–D4 and D3/11–D0/8; when HIGH, only the upper 8 bits (D11–D4) are driven while D3/11–D0/8 go high-impedance. HBEN also disables conversion start when asserted HIGH-verified in Pin Functions and Timing Diagram TA05/TA06.
How is the reference voltage used internally in the LTC1276BCSW#PBF?
The 2.42V reference from the VREF pin (Pin 2) is internally connected to the 12-bit capacitive DAC and defines the full-scale span for ±5V conversion. It is factory trimmed and temperature compensated (±5ppm/°C), eliminating need for external calibration. The same reference is available externally to bias supporting circuitry, but driving it externally is not recommended for LTC1276BCSW#PBF per datasheet Section "Driving the Reference".
LTC1276BCSW#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):
- 300k
- 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:
- Internal
- Voltage - Supply, Analog:
- ±5V, 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1276BCSW#PBF FAQ
1.How can I place an order for LTC1276BCSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1276BCSW#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 LTC1276BCSW#PBF reliable?
The price and inventory of LTC1276BCSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1276BCSW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1276BCSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1276BCSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1276BCSW#PBF?
LTC1276BCSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1276BCSW#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 LTC1276BCSW#PBF?
For technical support, including LTC1276BCSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1276BCSW#PBF requirements.
6.How does Aetrix verify that LTC1276BCSW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1276BCSW#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 LTC1276BCSW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1276BCSW#PBF?
All LTC1276BCSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1276BCSW#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 LTC1276BCSW#PBF part is unused and in its original packaging.
Return procedure for LTC1276BCSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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