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Analog Devices Inc. LTC1276ACN#PBF
- Part No.:
- LTC1276ACN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1276ACN#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,921
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Product details
Overview
LTC1276ACN#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 300ksps successive-approximation ADC designed for ±5V bipolar input operation. It integrates a 2.42V on-chip reference (±5ppm/°C max), internal synchronized clock (2.7µs conversion time), and high-impedance analog input. It delivers 70dB S/(N+D) and 77dB THD at Nyquist (150kHz), with ±1/2LSB INL and ±3/4LSB DNL (A-grade), targeting precision data acquisition in industrial instrumentation.
For engineers reviewing the LTC1276ACN#PBF datasheet, LTC1276ACN#PBF pinout, LTC1276ACN#PBF application, or LTC1276ACN#PBF equivalent, key selection criteria include its ±5V input range, 24-pin PDIP package, internal reference accuracy, 300ksps throughput, and compatibility with microprocessor parallel bus interfaces using CS/RD/HBEN control.
Technical Context
The LTC1276ACN#PBF uses LTBiCMOS switched-capacitor technology with an integrated sample-and-hold (600ns acquisition time) and 12-bit capacitive DAC. Its SAR architecture operates without external clocking due to a factory-trimmed internal oscillator synchronized to RD commands.
Digital interface supports two-byte read (via HBEN multiplexing) or full 12-bit parallel output, with BUSY status signaling and three-state outputs. Input range is fixed at ±5V when powered from ±5V supplies (VDD = +5V, VSS = –5V), and DC accuracy is specified over 0°C to 70°C.
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 limit) without aliasing. |
| Analog Input Range | ±5V bipolar; requires ±4.95V to ±5.25V supplies; supports direct connection to ±5V sensor outputs. |
| S/(N + D) Ratio | 70dB at 150kHz input; corresponds to ~11.3 effective bits, suitable for medium-fidelity spectral analysis. |
| INL / DNL | ±1/2LSB max integral linearity and ±3/4LSB max differential linearity (A-grade); ensures <0.012% gain error across full scale. |
| Reference Voltage | 2.420V ±0.020V (0°C–70°C); 25ppm/°C max tempco; provides stable scaling for ±5V full-scale conversion (1LSB = 2.44mV). |
| Power Dissipation | 75mW typical at 300ksps; enables low-thermal-load designs in dense PCB layouts without forced cooling. |
Pinout & Package
Package: 24-lead plastic DIP (PDIP), 0.300" wide, through-hole mount. Pin pitch: 0.100", body width: 0.300", overall dimensions: 0.785" × 0.270". RoHS-compliant lead-free finish (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog Input | Accepts ±5V differential input relative to AGND; high-impedance (>1GΩ), low-leakage (±1µA) node requiring <100Ω source for optimal AC performance. |
| VREF (2) | Reference Output | 2.42V buffered reference output; must be decoupled with 10µF tantalum + 0.1µF ceramic to AGND for noise suppression. |
| AGND (3) | Analog Ground | Separate ground return for analog circuitry; must be tied to DGND at single point to minimize digital noise coupling. |
| D11–D4 (4–11) | Data Outputs (MSB–D4) | Three-state parallel outputs; active when CS and RD low; drive standard TTL/CMOS loads with VOH ≥4.0V @ –200µA. |
| DGND (12) | Digital Ground | Digital supply return; connects to system digital ground plane; isolation from AGND prevents ground bounce corruption of analog measurements. |
| D3/11–D0/8 (13–16) | Data Outputs (D3–D0 / D11–D8) | Multiplexed lower byte; HBEN = LOW enables full 12-bit parallel output; HBEN = HIGH enables two-byte read mode. |
| NC (17,18) | No Connection | Unbonded pins; must remain unconnected to avoid parasitic coupling or mechanical stress. |
| HBEN (19) | High-Byte Enable | Controls data bus multiplexing; LOW enables D11–D0 full-word output; HIGH disables conversion start and enables byte-mode reads. |
| RD (20) | Read Input | Active-low control initiating conversion when CS and HBEN are low; also enables output drivers during data transfer. |
| CS (21) | Chip Select | Active-low enable for RD and HBEN inputs; must be held low during conversion and data access cycles. |
| BUSY (22) | Conversion Status | Open-collector output; LOW during conversion (2.7µs); used for polling or interrupt-driven data capture synchronization. |
| VSS (23) | Negative Supply | –5V supply rail; bypass to AGND with 0.1µF ceramic; absolute max –6V; required for ±5V input operation. |
| VDD (24) | Positive Supply | +5V supply rail; bypass to AGND with 10µF tantalum + 0.1µF ceramic; absolute max +12V; powers analog and digital sections. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronized Clock | Eliminates external clock routing and jitter concerns; conversion timing fully controlled by RD edge, enabling deterministic sampling in noisy environments. |
| On-Chip 2.42V Reference | Reduces BOM count and layout area; ±5ppm/°C tempco ensures <0.1% full-scale drift from 0°C to 70°C without calibration. |
| High-Impedance Analog Input | ±1µA leakage allows direct interface with high-output-impedance sensors (e.g., piezoelectric transducers) without buffer amplifiers in DC-critical applications. |
| ESD Protection on All Pins | Withstands >2kV HBM per JEDEC JS-001; protects against handling damage and board-level ESD events during assembly and field operation. |
| Two-Byte Read Mode | HBEN-controlled multiplexing reduces microcontroller data bus width requirements from 12 to 8 bits, simplifying interface to legacy 8-bit processors. |
Applications
| Industrial Process Monitoring | Audio Signal Digitization |
|---|---|
Use Scenario: Continuous voltage monitoring of ±5V output transmitters (e.g., 4–20mA loop converters with I/V resistors) in PLC analog input modules. IC Role / Device Role: Precision 12-bit digitizer converting sensor-derived bipolar signals into microcontroller-readable digital words at 300ksps. Use Value: ±1/2LSB INL ensures <0.012% measurement linearity across 4096 codes, meeting SIL-2 functional safety requirements for closed-loop control feedback. | Use Scenario: Digitizing line-level audio (±2.5V peak) in professional audio analyzers requiring FFT-based harmonic distortion analysis. IC Role / Device Role: High-fidelity sampling front-end feeding DSP engines; leverages 77dB THD to resolve 7th harmonics in 15kHz bandwidth. Use Value: 70dB S/(N+D) at 150kHz Nyquist enables accurate spectral content capture up to 10kHz with >11 ENOB, satisfying AES17 compliance thresholds. |
| Multiplexed Sensor Acquisition | Spectrum Analysis Instrumentation |
Use Scenario: Scanning multiple ±5V thermocouple amplifier outputs via analog multiplexer in environmental test chambers. IC Role / Device Role: Shared ADC resource serving 8–16 channels; internal 600ns acquisition time minimizes per-channel dead time. Use Value: High-impedance AIN and low input capacitance (5pF in hold mode) prevent channel crosstalk and settling errors during rapid multiplexing. | Use Scenario: Real-time RF spectrum monitoring in EMC pre-compliance testers capturing 0–150kHz baseband signals. IC Role / Device Role: Time-domain sampling engine feeding FFT hardware; exploits full linear bandwidth of 200kHz (S/(N+D) ≥68dB). Use Value: 200kHz full-linear bandwidth ensures amplitude accuracy within 0.1dB across 0–100kHz, critical for CISPR 16-1-1 conducted emission measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, 300ksps sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7800KP | 12-bit, 200ksps, ±5V input, external reference required; no internal clock; 28-pin SOIC package. | Lower speed and no integrated reference increase system complexity; requires external clock and reference design effort. | Select when lower power (35mW) and smaller SOIC footprint outweigh need for internal clock/reference integration. |
| MAX195BCPP | 16-bit, 100ksps, ±5V input, internal reference (2.5V), SPI interface; 28-pin DIP package. | Higher resolution but slower speed; serial interface reduces pin count but increases CPU overhead vs parallel bus. | Select when 16-bit resolution is mandatory and 100ksps suffices; accept SPI timing constraints and reduced throughput. |
Compared with ADS7800KP and MAX195BCPP, the LTC1276ACN#PBF uniquely combines 300ksps speed, ±5V bipolar input, internal 2.42V reference, and synchronous parallel interface in a 24-pin PDIP-enabling drop-in replacement in legacy industrial DAQ systems without redesigning reference, clock, or bus logic.
Availability
LTC1276ACN#PBF is available at Aetrix Electronics and suitable for industrial process monitoring, audio digitization, and spectrum analysis requiring stable component supply, long-term obsolescence management, and traceable lot-level documentation.
Supply support for LTC1276ACN#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 LTC1276ACN#PBF belongs to Linear Technology's legacy precision data acquisition product line, engineered for high-accuracy, low-noise, and easy-to-integrate ADC solutions in space-constrained industrial instrumentation.
FAQ
What is the operating temperature range for the LTC1276ACN#PBF?
The LTC1276ACN#PBF is rated for commercial operation from 0°C to 70°C. This range is explicitly defined in the Absolute Maximum Ratings table and applies to all DC and AC specifications including INL, DNL, S/(N+D), and reference stability. Operation outside this range may result in parametric degradation or permanent damage.
Does the LTC1276ACN#PBF require an external clock source?
No, the LTC1276ACN#PBF does not require an external clock. It features an internally trimmed oscillator that automatically synchronizes to each RD command, delivering a guaranteed 2.7µs conversion time. This eliminates clock routing, jitter sensitivity, and external component dependencies-simplifying PCB layout and improving timing determinism.
Can the LTC1276ACN#PBF operate with a single 5V supply?
No, the LTC1276ACN#PBF cannot operate with a single 5V supply. It requires dual ±5V supplies (VDD = +5V, VSS = –5V) to support its ±5V analog input range. Attempting single-supply operation violates Absolute Maximum Ratings and will result in incorrect conversion or device damage. The LTC1273 variant is the single-supply (0V–5V) member of the family.
What is the purpose of the HBEN pin on the LTC1276ACN#PBF?
The HBEN (High-Byte Enable) pin on the LTC1276ACN#PBF controls data bus multiplexing: when LOW, it enables full 12-bit parallel output on D11–D0/8; when HIGH, it restricts output to D11–D8 (high byte) and disables conversion initiation. This allows 8-bit microcontrollers to read the 12-bit result in two sequential bytes, reducing interface complexity without external latches.
How is the reference voltage used internally in the LTC1276ACN#PBF?
The 2.42V reference voltage generated at the VREF pin is internally connected to the 12-bit capacitive DAC and serves as the scaling基准 for the ±5V full-scale input range. It defines 1LSB = 2.44mV (10V/4096). The reference is curvature-corrected and factory-trimmed; driving VREF externally is not recommended for the LTC1276ACN#PBF as it risks exceeding supply rails and losing full-scale codes.
LTC1276ACN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
LTC1276ACN#PBF FAQ
1.How can I place an order for LTC1276ACN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1276ACN#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 LTC1276ACN#PBF reliable?
The price and inventory of LTC1276ACN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1276ACN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1276ACN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1276ACN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1276ACN#PBF?
LTC1276ACN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1276ACN#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 LTC1276ACN#PBF?
For technical support, including LTC1276ACN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1276ACN#PBF requirements.
6.How does Aetrix verify that LTC1276ACN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1276ACN#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 LTC1276ACN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1276ACN#PBF?
All LTC1276ACN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1276ACN#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 LTC1276ACN#PBF part is unused and in its original packaging.
Return procedure for LTC1276ACN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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