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Analog Devices Inc. LTC1282BCSW#PBF
- Part No.:
- LTC1282BCSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1282BCSW#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,932
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Product details
Overview
LTC1282BCSW#PBF from Analog Devices is a 12-bit, 140ksps sampling analog-to-digital converter with integrated 1.20V reference, internal synchronized clock, and 24-pin SO Wide package. It operates from single 3V or dual ±3V supplies, delivers ±0.5LSB INL and ±0.75LSB DNL, and achieves 69dB S/(N + D) at 70kHz Nyquist input-used in high-speed data acquisition systems requiring precision timing and low-power operation.
For engineers reviewing the LTC1282BCSW#PBF datasheet, LTC1282BCSW#PBF pinout, LTC1282BCSW#PBF application, or LTC1282BCSW#PBF equivalent, key selection criteria include unipolar/bipolar input range flexibility (0V–2.5V or ±1.25V), guaranteed 2.7V minimum supply voltage, ESD protection on all pins, and 6µs maximum conversion time with no external clock required.
Technical Context
The LTC1282BCSW#PBF employs successive approximation register (SAR) architecture with an integrated 12-bit capacitive DAC and sample-and-hold circuit. Its internal clock is factory-trimmed to ensure ≤6µs conversion time and automatically synchronizes to each RD command, eliminating asynchronous clock noise.
It supports two parallel output modes: full 12-bit bus (D11–D0/8) when HBEN is low, or multiplexed 8-bit+4-bit readout when HBEN is high. Input ranges are dynamically selected by VSS connection-grounded for unipolar (0V–2.5V), –3V for bipolar (±1.25V)-with two's complement output format in bipolar mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes; guarantees monotonic transfer function across full input range. |
| Sampling Rate | 140ksps max; enables real-time capture of signals up to 70kHz (Nyquist) without aliasing in baseband applications. |
| INL / DNL | ±0.5LSB / ±0.75LSB max over 0°C–70°C; ensures accurate code transition alignment for measurement-critical systems. |
| S/(N + D) | 69dB at 70kHz input; corresponds to ~11.3 effective bits, supporting high-fidelity signal digitization in audio and telecom processing. |
| Reference Voltage | 1.200V ±10mV (25ppm/°C max drift); internally trimmed bandgap source eliminates need for external reference in cost-sensitive designs. |
| Supply Range | 2.7V–3.6V (unipolar) or ±2.5V–±3.6V (bipolar); accommodates battery-powered and industrial rail variations. |
| Power Dissipation | 12mW typical at 140ksps; enables thermal management in dense PCB layouts without heatsinking. |
Pinout & Package
Package: 24-lead plastic SO wide (SW), 0.300" body width, RoHS-compliant lead-free finish (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog input | Accepts 0V–2.5V (unipolar) or ±1.25V (bipolar); high-impedance input with 63pF capacitance during sampling. |
| VREF (2) | Reference output | Provides 1.20V ±10mV; requires 10µF tantalum + 0.1µF ceramic bypass to AGND for low-noise operation. |
| AGND (3) | Analog ground | Separate ground return for analog section; 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 only when CS and RD are low; D11 is MSB in natural binary format. |
| DGND (12) | Digital ground | Ground reference for digital interface; connects to AGND at system star point to prevent ground loops. |
| D3/11–D0/8 (13–16) | Multiplexed data outputs | Deliver lower 4 bits when HBEN = HIGH; enable byte-wide reads for 8-bit microcontrollers. |
| HBEN (19) | High-byte enable | Controls data bus multiplexing; disables conversion start when HIGH-used for synchronization in multi-ADC systems. |
| RD (20) | Read control | Active-low signal that initiates conversion and enables output drivers; timing-critical for data access (t3 = 100ns min). |
| CS (21) | Chip select | Enables RD and HBEN logic; must be low for device to respond-supports multiple ADC sharing same data bus. |
| BUSY (22) | Status indicator | Active-low open-drain output signaling conversion in progress; used for handshaking with FIFOs or DSPs. |
| VSS (23) | Negative supply | –3V for bipolar mode; tied to DGND for unipolar operation; decoupling required with 0.1µF ceramic to AGND. |
| VDD (24) | Positive supply | 3V nominal; requires 10µF tantalum + 0.1µF ceramic bypass to AGND; supports 2.7V–3.6V operating range. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronized clock | Eliminates external clock source and associated jitter/noise; reduces BOM count and layout complexity. |
| Unipolar/bipolar mode selection | Configured via VSS connection-no software or register writes needed-enabling flexible signal conditioning in mixed-signal systems. |
| ESD protection on all pins | Withstands >60mA transient current without latchup; simplifies board-level ESD design for industrial environments. |
| Guaranteed 2.7V minimum supply | Ensures reliable operation down to depleted battery voltages in portable instrumentation and remote sensors. |
| High-impedance analog input | Draws only ±1µA leakage current; allows direct connection to high-Z sources like piezoelectric sensors or photodiode amplifiers. |
Applications
| Audio Signal Digitization | DSP-Based Spectrum Analysis |
|---|---|
Use Scenario: Capturing microphone or line-level audio signals in portable voice recorders or VoIP gateways. IC Role / Device Role / Timing Role: 12-bit SAR ADC performing real-time sampling at 140ksps with 69dB S/(N + D) to preserve dynamic range. Use Value: Enables CD-quality (44.1kHz-equivalent) oversampling without external decimation filters or clock trees. | Use Scenario: Real-time frequency-domain analysis in test equipment or RF monitoring receivers. IC Role / Device Role / Timing Role: High-speed data acquisition front-end feeding FFT engines in FPGAs or fixed-point DSPs. Use Value: 77dB THD at Nyquist ensures clean spectral representation with minimal harmonic contamination. |
| Multiplexed Sensor Acquisition | Industrial Process Monitoring |
Use Scenario: Scanning multiple thermocouple, strain gauge, or pressure transducer channels in PLC I/O modules. IC Role / Device Role / Timing Role: Precision ADC with ±0.5LSB INL and 25ppm/°C reference drift, interfaced via parallel bus to microcontroller. Use Value: Reduces calibration overhead and improves long-term accuracy stability across temperature gradients. | Use Scenario: Monitoring motor current, voltage, and temperature in variable-frequency drives or power inverters. IC Role / Device Role / Timing Role: Bipolar-mode ADC accepting ±1.25V inputs from isolated current shunt amplifiers. Use Value: Supports true differential measurement with two's complement output, simplifying sign-aware firmware math. |
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 |
|---|---|---|---|
| ADS7822U | 8-bit resolution, SPI interface, 200ksps, no internal reference | Lower resolution and serial interface limit use in high-accuracy parallel-bus systems | Select when cost and board space are prioritized over resolution and speed. |
| MAX1166BCAP+ | 12-bit, 100ksps, internal reference, SPI interface, 20-pin TSSOP | Lacks parallel bus and HBEN multiplexing; slower throughput and different pinout | Choose for SPI-based microcontrollers where PCB routing simplicity outweighs parallel interface benefits. |
Compared with ADS7822U and MAX1166BCAP+, the LTC1282BCSW#PBF uniquely combines 12-bit parallel output, internal clock synchronization, and unipolar/bipolar mode switching-making it optimal for legacy 8051/DSP systems requiring deterministic timing and minimal external components.
Availability
LTC1282BCSW#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition, digital signal processing, and multiplexed sensor systems requiring stable component supply and long-term industrial availability.
Supply support for LTC1282BCSW#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1282BCSW#PBF belongs to the Linear Technology (acquired by Analog Devices) precision data acquisition product line, designed specifically for applications demanding low-power, high-speed, and self-contained ADC functionality without external timing or reference components.
FAQ
What is the guaranteed operating temperature range for the LTC1282BCSW#PBF?
The LTC1282BCSW#PBF is specified and tested over 0°C to 70°C (Commercial grade). While the die is rated for –40°C to 85°C, only the 0°C–70°C range is guaranteed per datasheet Rev. B. For extended temperature operation, consult Analog Devices for special-order industrial-grade variants.
Does the LTC1282BCSW#PBF require an external clock source?
No, the LTC1282BCSW#PBF does not require an external clock. It features an internally trimmed clock that guarantees ≤6µs conversion time and automatically synchronizes to each RD command-eliminating clock distribution noise and reducing system complexity.
How is bipolar versus unipolar mode selected on the LTC1282BCSW#PBF?
Bipolar or unipolar mode on the LTC1282BCSW#PBF is selected solely by the VSS pin connection: tie VSS to DGND for unipolar mode (0V–2.5V input); apply –3V to VSS for bipolar mode (±1.25V input with two's complement output). No configuration registers or external components are needed.
What is the purpose of the HBEN pin on the LTC1282BCSW#PBF?
The HBEN (High Byte Enable) pin on the LTC1282BCSW#PBF controls data bus multiplexing: when LOW, all 12 bits appear on D11–D0/8; when HIGH, only D11–D8 are active while D3/11–D0/8 output the lower nibble-enabling efficient 8-bit microcontroller interfacing without external latches.
Can the internal reference of the LTC1282BCSW#PBF be overdriven for input span adjustment?
Yes, the VREF pin of the LTC1282BCSW#PBF can be overdriven with an external DAC or op amp to adjust input span. The internal reference is disabled when VREF exceeds 1.25V; recommended drive range is 1.25V–1.44V (unipolar) or 1.25V–2.88V (bipolar) to maintain full-scale compliance within supply rails.
LTC1282BCSW#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):
- 140k
- 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:
- 2.7V ~ 3.6V, ±3V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1282BCSW#PBF FAQ
1.How can I place an order for LTC1282BCSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1282BCSW#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 LTC1282BCSW#PBF reliable?
The price and inventory of LTC1282BCSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1282BCSW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1282BCSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1282BCSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1282BCSW#PBF?
LTC1282BCSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1282BCSW#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 LTC1282BCSW#PBF?
For technical support, including LTC1282BCSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1282BCSW#PBF requirements.
6.How does Aetrix verify that LTC1282BCSW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1282BCSW#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 LTC1282BCSW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1282BCSW#PBF?
All LTC1282BCSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1282BCSW#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 LTC1282BCSW#PBF part is unused and in its original packaging.
Return procedure for LTC1282BCSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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