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Analog Devices Inc. LTC1276ACSW#PBF
- Part No.:
- LTC1276ACSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1276ACSW#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,426
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Product details
Overview
LTC1276ACSW#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 delivers ±1/2LSB INL, 70dB S/(N+D) at 150kHz, and 75mW typical power dissipation for precision data acquisition in industrial instrumentation.
For engineers reviewing the LTC1276ACSW#PBF datasheet, LTC1276ACSW#PBF pinout, LTC1276ACSW#PBF application, or LTC1276ACSW#PBF equivalent, key selection criteria include bipolar ±5V input support, internal reference tempco (±5ppm/°C), 2.7µs conversion time, high-impedance analog input (±1µA leakage), and compatibility with microprocessor/DSP parallel interfaces using HBEN-controlled 12-bit output multiplexing.
Technical Context
The LTC1276ACSW#PBF implements a 12-bit capacitive DAC-based successive approximation register (SAR) architecture with integrated sample-and-hold (600ns acquisition time) and factory-trimmed internal clock. It operates from ±4.95V to ±5.25V supplies and supports unbuffered bipolar input ranges without external op-amp buffering when source impedance is ≤100Ω.
Its digital interface uses active-low CS and RD signals with HBEN to control 8-bit/12-bit bus multiplexing, BUSY status indication, and three-state outputs. The device features ESD protection on all pins and is specified for 0°C to 70°C operation with A-grade DC accuracy (±1/2LSB INL, ±3/4LSB DNL).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes; guarantees monotonic transfer function for accurate signal reconstruction. |
| Sampling Rate | 300ksps maximum; enables real-time capture of signals up to 150kHz Nyquist frequency. |
| Analog Input Range | ±5V bipolar; requires ±4.95V to ±5.25V dual supply; supports direct connection to ±5V sensor outputs. |
| INL / DNL | ±1/2LSB max integral linearity, ±3/4LSB max differential linearity; ensures <0.012% full-scale error in precision measurement. |
| S/(N + D) | 70dB at 150kHz input; corresponds to ~11.3 effective bits for high-fidelity spectral analysis. |
| Reference Voltage | 2.42V ±0.02V output with ±5ppm/°C tempco; provides stable scaling without external reference components. |
| Power Dissipation | 75mW typical at 300ksps; enables low-thermal-load designs in dense PCB layouts. |
| Conversion Time | 2.7µs maximum; allows minimum 600ns inter-conversion delay for sustained throughput. |
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 | Accepts ±5V differential input referenced to AGND; high-impedance (±1µA leakage) with 5pF hold-mode capacitance. |
| VREF (2) | Reference Output | 2.42V bandgap reference output; requires 10µF + 0.1µF decoupling; supplies up to 1mA load current. |
| AGND (3) | Analog Ground | Separate 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 outputs; driven only when CS and RD are low; high-impedance otherwise. |
| DGND (12) | Digital Ground | Digital return path; connects to AGND at system star point to prevent ground loops. |
| D3/11–D0/8 (13–16) | Data Outputs | Lower byte outputs; multiplexed with upper byte via HBEN; enable 8-bit bus interface compatibility. |
| NC (17,18) | No Connection | Unbonded pins; must remain floating; no routing or soldering required. |
| HBEN (19) | High-Byte Enable | When HIGH, disables conversion start and outputs upper byte (D11–D8); when LOW, enables full 12-bit read. |
| RD (20) | Read Control | Active-low signal that initiates conversion when CS and HBEN are low; also enables output drivers. |
| CS (21) | Chip Select | Active-low enable for RD and HBEN inputs; prevents spurious conversions during bus contention. |
| BUSY (22) | Status Output | Active-high open-drain indicator; asserts during conversion; used for polling or interrupt-driven timing. |
| VSS (23) | Negative Supply | –4.95V to –5.25V supply rail; bypass to AGND with 0.1µF ceramic capacitor. |
| VDD (24) | Positive Supply | +4.95V to +5.25V supply rail; bypass to AGND with 10µF tantalum + 0.1µF ceramic. |
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 25ppm/°C reference | Reduces BOM count and layout area; ±5ppm/°C typical tempco enables stable measurements across 0°C–70°C industrial range. |
| High-impedance analog input | ±1µA leakage and 50pF sample-mode capacitance allow direct connection to high-Z sources like piezoelectric sensors. |
| HBEN-controlled 12-bit bus interface | Supports both 8-bit microcontrollers (via byte multiplexing) and 16-bit DSPs (full parallel access) without glue logic. |
| ESD protection on all pins | Withstands >2kV HBM per JEDEC JESD22-A114; improves field reliability in handling-sensitive industrial environments. |
| 600ns sample-and-hold acquisition | Enables accurate digitization of fast transients; compatible with op-amps like LT1220 that settle within 600ns after current spike. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous monitoring of ±5V output signals from pressure, temperature, and flow sensors in PLC I/O modules. IC Role / Device Role / Timing Role: Precision 12-bit digitizer capturing slow-varying analog process variables at sub-100ksps rates with minimal drift. Use Value: ±1/2LSB INL and ±5ppm/°C reference ensure <0.02% full-scale accuracy over temperature without recalibration. | Use Scenario: High-speed stimulus-response testing of analog circuits using programmable waveform generators and digitizers. IC Role / Device Role / Timing Role: 300ksps sampling front-end synchronizing with pattern generator clocks via RD-triggered acquisition. Use Value: 2.7µs conversion time and BUSY status enable tight loop timing; 70dB S/(N+D) supports >10-bit effective resolution in FFT-based analysis. |
| Digital Signal Processing Front-End | Communications Baseband Processing |
Use Scenario: Digitizing baseband audio or IF signals in telecom modems and software-defined radio receivers. IC Role / Device Role / Timing Role: Bipolar ADC interfacing directly to op-amp buffers driving ±5V signal chains before FPGA-based filtering. Use Value: ±5V input range matches standard op-amp rails; 77dB THD at Nyquist preserves signal fidelity for 16-QAM demodulation. | Use Scenario: Capturing RF downconverted signals in cellular infrastructure equipment requiring wide dynamic range. IC Role / Device Role / Timing Role: Medium-speed ADC in multi-channel receiver paths where cost, power, and integration outweigh ultra-high speed needs. Use Value: 11.3 ENOB at 150kHz enables >60dB SFDR for adjacent channel rejection; internal reference eliminates external component variance. |
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 speed but wider input range; requires external 2.5V reference and buffer op-amp | Select when ±10V sensor interfaces dominate and 100ksps suffices; avoid if internal reference or 300ksps is mandatory. |
| MAX195BCNG+ | 16-bit, 100ksps, ±5V input, internal reference, 28-pin PDIP/SO package | Higher resolution but half the speed; larger package footprint; higher power (120mW) | Select when 16-bit resolution is critical and 100ksps meets system latency; avoid for throughput-constrained designs. |
Compared with ADS7800U and MAX195BCNG+, the LTC1276ACSW#PBF offers optimal balance of speed (300ksps), integrated reference (2.42V), and compact 24-pin SW package-making it preferred for space-constrained, medium-speed industrial DAQ where ±5V bipolar input and self-contained timing are essential.
Availability
LTC1276ACSW#PBF is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, digital signal processing front-ends, and communications baseband processing requiring stable component supply and long-term obsolescence management.
Supply support for LTC1276ACSW#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 LTC1276ACSW#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for medium-speed, high-accuracy industrial and instrumentation applications demanding integrated references, low power, and robust bipolar input capability.
FAQ
What is the operating temperature range for the LTC1276ACSW#PBF?
The LTC1276ACSW#PBF is rated for commercial temperature operation from 0°C to 70°C. This range is explicitly defined in the Absolute Maximum Ratings table and applies to all A-grade specifications including ±1/2LSB INL and ±3/4LSB DNL. The device uses LTBiCMOS switched-capacitor technology optimized for stability across this interval.
Does the LTC1276ACSW#PBF require an external clock source?
No, the LTC1276ACSW#PBF does not require an external clock. It incorporates an internally trimmed clock that automatically synchronizes to each RD command, eliminating clock routing, jitter sensitivity, and external component count. The maximum conversion time is 2.7µs, fixed by this internal oscillator.
How is the analog input range configured for the LTC1276ACSW#PBF?
The LTC1276ACSW#PBF is factory-configured for ±5V bipolar input range, which is enabled by its ±4.95V to ±5.25V dual-supply operation. Unlike the LTC1273 (0V–5V) or LTC1275 (±2.5V), the LTC1276ACSW#PBF requires VSS = –4.95V to –5.25V and VDD = +4.95V to +5.25V to maintain specified accuracy and linearity.
Can the internal reference of the LTC1276ACSW#PBF be overdriven or replaced?
No-overdriving the VREF pin of the LTC1276ACSW#PBF is not recommended. While the LTC1275 allows external reference injection above 2.45V for span adjustment, the LTC1276ACSW#PBF's ±5V input range is tightly coupled to its internal 2.42V reference; exceeding VREF risks code loss at full scale and violates absolute maximum ratings.
What digital interface modes does the LTC1276ACSW#PBF support?
The LTC1276ACSW#PBF supports two parallel read modes controlled by HBEN: when HBEN is LOW, all 12 data bits (D11–D0/8) appear simultaneously on the bus; when HBEN is HIGH, only the upper byte (D11–D8) is driven while D3/11–D0/8 output low, enabling compatibility with 8-bit microcontrollers without external latches.
LTC1276ACSW#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:
- -
LTC1276ACSW#PBF FAQ
1.How can I place an order for LTC1276ACSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1276ACSW#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 LTC1276ACSW#PBF reliable?
The price and inventory of LTC1276ACSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1276ACSW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1276ACSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1276ACSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1276ACSW#PBF?
LTC1276ACSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1276ACSW#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 LTC1276ACSW#PBF?
For technical support, including LTC1276ACSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1276ACSW#PBF requirements.
6.How does Aetrix verify that LTC1276ACSW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1276ACSW#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 LTC1276ACSW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1276ACSW#PBF?
All LTC1276ACSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1276ACSW#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 LTC1276ACSW#PBF part is unused and in its original packaging.
Return procedure for LTC1276ACSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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