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Analog Devices Inc. LTC1275BCSW#TRPBF
- Part No.:
- LTC1275BCSW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1275BCSW#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,428
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Product details
Overview
LTC1275BCSW#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 300ksps successive-approximation ADC optimized for ±2.5V bipolar input operation with internal 2.42V reference, 75mW typical power dissipation, and ±1/2LSB INL max over 0°C to 70°C. It integrates sample-and-hold, internal synchronized clock, and high-impedance analog input - used in precision data acquisition systems requiring low-noise, high-linearity digitization of sensor or instrumentation signals.
For engineers reviewing the LTC1275BCSW#TRPBF datasheet, LTC1275BCSW#TRPBF pinout, LTC1275BCSW#TRPBF application, or LTC1275BCSW#TRPBF equivalent, key selection criteria include its ±2.5V input range, 24-pin SO Wide package, 70dB S/(N+D) at Nyquist, 2.7µs conversion time, and compatibility with microprocessor parallel bus interfaces via CS/RD/HBEN control.
Technical Context
The LTC1275BCSW#TRPBF implements a 12-bit successive approximation register (SAR) architecture with integrated capacitive DAC and high-speed comparator. Its internal 2.42V bandgap reference features ±5ppm/°C tempco and supports up to 1mA load current.
Conversion is initiated by active-low CS and RD with optional HBEN for byte-multiplexed output. The device operates from ±5V supplies (VDD = +4.75V to +5.25V, VSS = –2.45V to –5.25V), delivers 600ns sample-and-hold acquisition time, and maintains full DC accuracy across its commercial temperature range (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 precise measurement integrity. |
| Sampling Rate | 300ksps maximum - enables real-time capture of signals up to 150kHz Nyquist frequency. |
| Analog Input Range | ±2.5V bipolar - matches industrial sensor outputs and differential signal chains without external level-shifting. |
| S/(N + D) Ratio | 70dB at 150kHz input - ensures >11.3 effective bits for high-fidelity spectral analysis and dynamic signal capture. |
| INL / DNL | ±1/2LSB max integral nonlinearity, ±3/4LSB max differential nonlinearity - preserves code-to-code accuracy critical for calibration-sensitive applications. |
| Reference Voltage | 2.420V ±20mV with ±5ppm/°C tempco - provides stable scaling for absolute voltage measurements across temperature. |
| Power Dissipation | 75mW typical at 300ksps - enables dense PCB layouts and low-thermal-load embedded designs. |
Pinout & Package
Package: 24-lead plastic SO wide (SW), 0.300" body width, RoHS-compliant, lead-free (#PBF), tape-and-reel (#TRPBF). Thermal resistance θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog Input | ±2.5V bipolar input node; high-impedance (>1GΩ), 50pF capacitance in sample mode - accepts direct connection to low-output-impedance op amps (e.g., LT1220). |
| VREF (2) | Reference Output | 2.42V internal reference source; requires 10µF tantalum + 0.1µF ceramic bypass 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 byte) | Three-state parallel outputs; driven when CS and RD low - interface directly to 8-bit data buses or FIFOs. |
| DGND (12) | Digital Ground | Dedicated ground for digital I/O; isolation from AGND prevents switching noise from degrading AC performance. |
| D3/11–D0/8 (13–16) | Data Outputs (LSB byte) | Multiplexed lower byte; enabled only when HBEN = LOW - supports 8-bit microcontroller interfacing with two-byte read sequence. |
| NC (17, 18) | No Connection | Unbonded pins; must remain unconnected per design - no routing or grounding allowed. |
| HBEN (19) | High-Byte Enable | Controls data bus multiplexing: LOW enables full 12-bit parallel output; HIGH disables conversion start and forces D3–D0 low. |
| RD (20) | Read Input | Active-low conversion trigger and output enable; initiates sampling when CS and HBEN are low - synchronous with internal clock. |
| CS (21) | Chip Select | Active-low enable for RD and HBEN logic - allows multiple ADCs on shared data bus with address decoding. |
| BUSY (22) | Conversion Status | Open-drain output; LOW during conversion (2.7µs), HIGH when result ready - used for polling or interrupt-driven data capture. |
| VSS (23) | Negative Supply | –2.45V to –5.25V supply rail; bypass to AGND with 0.1µF ceramic - essential for bipolar input compliance and reference stability. |
| VDD (24) | Positive Supply | +4.75V to +5.25V supply rail; bypass to AGND with 10µF tantalum + 0.1µF ceramic - powers analog and digital sections. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronized clock | Eliminates external clock routing and asynchronous jitter - ensures deterministic 2.7µs conversion time without timing margin concerns. |
| On-chip 25ppm/°C reference | Factory-trimmed 2.42V bandgap with curvature correction - removes need for external reference IC and reduces BOM count by one component. |
| ESD protection on all pins | Withstands >2kV HBM - enables robust handling during assembly and field operation without additional transient protection. |
| High-impedance analog input | ±1µA leakage at CS = HIGH - permits direct connection to high-Z sources (e.g., potentiometers, RTDs with buffer) without gain error. |
| Parallel 12-bit interface | Supports both full-word (12-bit) and byte-multiplexed (2×8-bit) reads - simplifies integration with legacy 8-bit microcontrollers and modern 16-bit DSPs. |
Applications
| Industrial Sensor Interface | Audio Signal Digitization |
|---|---|
|
Use Scenario: Digitizing ±2.5V outputs from strain-gauge bridges, thermocouples, or LVDTs in PLC analog input modules. IC Role / Device Role / Timing Role: Precision 12-bit SAR ADC with integrated reference and sample-and-hold - performs single-shot or continuous conversions synchronized to controller timing. Use Value: ±1/2LSB INL and 70dB S/(N+D) ensure <0.025% full-scale measurement accuracy and clean FFT spectra for diagnostics. |
Use Scenario: Capturing line-level audio (±2.5V peak) in telecom voice codecs or professional audio test equipment. IC Role / Device Role / Timing Role: High-fidelity ADC with low THD (–74dB at 150kHz) and fast 300ksps sampling - supports wideband audio analysis up to 150kHz. Use Value: 77dB THD and 200kHz full linear bandwidth preserve harmonic content and transient fidelity in spectral analysis applications. |
| Multiplexed Data Acquisition | Spectrum Analyzer Front-End |
|
Use Scenario: Scanning multiple ±2.5V sensor channels using external analog multiplexer in automated test equipment. IC Role / Device Role / Timing Role: Low-acquisition-time (600ns) ADC with high-impedance input - minimizes settling delay between channel switches. Use Value: 50pF input capacitance in hold mode and ±1µA leakage reduce crosstalk and offset drift across 16-channel scan sequences. |
Use Scenario: Real-time RF intermediate-frequency sampling in portable spectrum analyzers operating up to 150kHz baseband. IC Role / Device Role / Timing Role: High-S/(N+D) ADC with 62dB ENOB at 100kHz - enables accurate amplitude and frequency measurement of narrowband signals. Use Value: –80dB IMD and 74dB S/(N+D) at 100kHz support detection of low-level spurs adjacent to strong carriers in EMI testing. |
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, ±5V input range, external reference required, 28-pin SOIC | Lower speed and wider input range; lacks integrated reference and internal clock | Select when ±5V full-scale is needed and system already provides precision reference; not drop-in due to pinout and timing differences. |
| MAX195BCNG+ | 16-bit, 100ksps, ±5V input, internal reference, SPI interface, 28-pin SSOP | Higher resolution but slower; serial interface replaces parallel bus - requires firmware redesign | Choose for enhanced DC accuracy in low-speed calibration systems; incompatible pinout and protocol prevent hardware reuse. |
Compared with ADS7800U and MAX195BCNG+, the LTC1275BCSW#TRPBF offers optimal balance of speed (300ksps), integrated timing/reference, and ±2.5V bipolar range - enabling simpler, lower-component-count designs for mid-speed industrial digitization where parallel interface and deterministic latency are critical.
Availability
LTC1275BCSW#TRPBF is available at Aetrix Electronics and suitable for industrial sensor interface, audio signal digitization, and multiplexed data acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1275BCSW#TRPBF 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 LTC1275BCSW#TRPBF belongs to ADI's legacy Linear Technology precision data converter family, designed specifically for high-accuracy, low-power, easy-to-use analog-to-digital conversion in space- and cost-constrained embedded systems.
FAQ
What is the operating temperature range for the LTC1275BCSW#TRPBF?
The LTC1275BCSW#TRPBF is rated for commercial operation from 0°C to 70°C. This B-grade specification ensures guaranteed performance for INL (±1/2LSB), DNL (±3/4LSB), and reference tempco (±5ppm/°C) across the full range - making it suitable for indoor industrial and test equipment environments where ambient temperatures remain within this window.
Does the LTC1275BCSW#TRPBF require an external clock?
No, the LTC1275BCSW#TRPBF does not require an external clock. It includes an internally trimmed oscillator that automatically synchronizes to each RD command, delivering a fixed 2.7µs conversion time. This eliminates clock routing, jitter sensitivity, and layout complexity - a key differentiator versus competing SAR ADCs requiring external timing sources.
Can the LTC1275BCSW#TRPBF accept unipolar inputs?
No, the LTC1275BCSW#TRPBF is specified exclusively for ±2.5V bipolar input operation. Its internal architecture and supply requirements (VSS = –2.45V to –5.25V) are optimized for symmetric ranges. For unipolar 0V–5V applications, the pin-compatible LTC1273BCSW#TRPBF should be selected instead - same package and footprint but different input and supply configuration.
What is the purpose of the HBEN pin on the LTC1275BCSW#TRPBF?
The HBEN (High-Byte Enable) pin on the LTC1275BCSW#TRPBF controls data bus multiplexing: when LOW, it enables full 12-bit parallel output on D11–D0/8; when HIGH, it disables conversion start and forces D3–D0 low. This allows flexible interfacing - e.g., connecting to 8-bit microcontrollers using two consecutive RD pulses to read MSB and LSB bytes separately.
How is the reference voltage used in the LTC1275BCSW#TRPBF?
The LTC1275BCSW#TRPBF uses its internal 2.42V reference to scale the ±2.5V analog input range, yielding 1.22mV per LSB. The VREF pin (Pin 2) provides this voltage externally and must be bypassed with 10µF tantalum + 0.1µF ceramic to AGND. Driving VREF externally is supported for span adjustment, but only on the LTC1275 - not recommended for LTC1273/LTC1276 due to supply rail conflicts.
LTC1275BCSW#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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, -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:
- -
LTC1275BCSW#TRPBF FAQ
1.How can I place an order for LTC1275BCSW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1275BCSW#TRPBF 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 LTC1275BCSW#TRPBF reliable?
The price and inventory of LTC1275BCSW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1275BCSW#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1275BCSW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1275BCSW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1275BCSW#TRPBF?
LTC1275BCSW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1275BCSW#TRPBF 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 LTC1275BCSW#TRPBF?
For technical support, including LTC1275BCSW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1275BCSW#TRPBF requirements.
6.How does Aetrix verify that LTC1275BCSW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1275BCSW#TRPBF 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 LTC1275BCSW#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1275BCSW#TRPBF?
All LTC1275BCSW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1275BCSW#TRPBF, 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 LTC1275BCSW#TRPBF part is unused and in its original packaging.
Return procedure for LTC1275BCSW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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