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Analog Devices Inc. LTC1275BCSW#PBF
- Part No.:
- LTC1275BCSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1275BCSW#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,564
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Product details
Overview
LTC1275BCSW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 300ksps successive-approximation ADC designed for ±2.5V bipolar input operation with ±5V dual supplies. It integrates a 2.42V internal reference (±5ppm/°C max), on-chip sample-and-hold (600ns acquisition), and synchronized internal clock - eliminating external timing components. Used in high-speed data acquisition systems requiring DC accuracy (±1/2LSB INL, ±3/4LSB DNL) and AC performance (70dB S/(N+D) at 150kHz Nyquist).
For engineers reviewing the LTC1275BCSW#PBF datasheet, LTC1275BCSW#PBF pinout, LTC1275BCSW#PBF application, or LTC1275BCSW#PBF equivalent, key selection criteria include its ±2.5V input range, SW package thermal resistance (θJA = 130°C/W), 75mW typical power dissipation, and parallel 12-bit output interface with HBEN-controlled byte multiplexing.
Technical Context
The LTC1275BCSW#PBF implements a capacitor-based successive approximation register (SAR) architecture with integrated 12-bit capacitive DAC and high-speed comparator. Its internal clock is factory-trimmed to guarantee ≤2.7µs conversion time and automatic synchronization to each RD pulse, avoiding asynchronous clock noise.
It supports two digital read modes: parallel 12-bit output (via D11–D0/8 pins) and two-byte mode using HBEN to multiplex upper/lower bytes onto D7–D0/8. Input signal conditioning leverages high-impedance analog input (±1µA leakage) and low-input-capacitance sample-and-hold (5pF in hold mode), enabling direct connection to precision op amps like LT1190 or LT1224.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer function for control-loop stability. |
| Sampling Rate | 300ksps maximum - enables real-time capture of signals up to 150kHz Nyquist frequency. |
| Analog Input Range | ±2.5V bipolar - matches standard industrial sensor outputs and differential amplifier stages. |
| INL / DNL | ±1/2LSB max INL, ±3/4LSB max DNL (B-grade) - ensures <0.012% full-scale linearity error for precision measurement. |
| S/(N + D) | 70dB at 150kHz - delivers ~11.3 effective bits for FFT-based spectral analysis applications. |
| Power Dissipation | 75mW typical at 300ksps - allows dense PCB layouts without forced air cooling in embedded systems. |
| Reference Voltage | 2.42V ±0.02V, ±5ppm/°C max tempco - provides stable scaling for ratiometric measurements without external reference. |
Pinout & Package
Package: 24-lead plastic SO wide (SW), 7.6mm × 15.4mm body, 1.27mm pitch, θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog Input | Accepts ±2.5V differential-equivalent signal referenced to AGND; high-Z input (±1µA leakage) minimizes loading on front-end circuitry. |
| VREF (2) | Reference Output | 2.42V bandgap reference output; requires 10µF + 0.1µF bypass to AGND for low-noise operation. |
| AGND (3) | Analog Ground | Separate ground return for analog circuitry; must be tied to DGND at single point to avoid digital noise coupling. |
| D11–D4 (4–11) | Data Outputs (MSB) | Three-state outputs for DB11–DB8; active when CS and RD are low; enable FIFO/DSP interfacing. |
| DGND (12) | Digital Ground | Dedicated ground for digital I/O; isolation from AGND reduces switching noise in conversion results. |
| D3/11–D0/8 (13–16) | Data Outputs (LSB/Byte-Mux) | Three-state outputs for DB3–DB0; HBEN selects between full 12-bit or byte-multiplexed read mode. |
| NC (17,18) | No Connection | Unbonded pins; must remain unconnected per datasheet to prevent parasitic coupling. |
| HBEN (19) | High-Byte Enable | Controls data bus multiplexing: LOW enables full 12-bit parallel output; HIGH disables conversion start and outputs DB11–DB8 only. |
| RD (20) | Read Strobe | 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 logic; allows multiple ADCs on shared data bus. |
| BUSY (22) | Conversion Status | Open-drain output asserted LOW during conversion; used for polling or interrupt-driven data capture. |
| VSS (23) | Negative Supply | –5V supply pin for LTC1275; bypass to AGND with 0.1µF ceramic for PSRR optimization. |
| VDD (24) | Positive Supply | +5V supply pin; bypass to AGND with 10µF tantalum + 0.1µF ceramic to suppress supply transients. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronized Clock | Eliminates need for external clock generator or crystal; removes clock skew and jitter concerns in multi-ADC systems. |
| On-Chip 2.42V Reference | Reduces BOM count and layout area; ±5ppm/°C drift enables stable measurements across 0°C–70°C commercial range. |
| 600ns Sample-and-Hold Acquisition | Allows use with low-settling-time op amps (e.g., LT1224); supports >100kSPS sustained throughput with source impedances ≤100Ω. |
| ESD Protection on All Pins | Withstands ≥2kV HBM per JEDEC JS-001 - improves robustness during handling and system integration. |
| Parallel 12-Bit Interface with HBEN | Enables flexible microprocessor/DSP interfacing: full-word reads or byte-multiplexed access to reduce bus width requirements. |
Applications
| Industrial Process Monitoring | Digital Signal Processing Front-End |
|---|---|
Use Scenario: Continuous monitoring of ±10V sensor outputs (e.g., strain gauges, RTDs) conditioned to ±2.5V range via precision resistive dividers. IC Role / Device Role / Timing Role: Precision 12-bit digitizer capturing transients at 300ksps with <0.012% linearity for closed-loop PID controller feedback. Use Value: ±1/2LSB INL ensures accurate representation of small process deviations; internal reference eliminates calibration drift over temperature. | Use Scenario: Real-time acquisition of audio or telecom baseband signals prior to FFT processing in FPGA-based spectrum analyzers. IC Role / Device Role / Timing Role: High-fidelity sampling engine delivering 70dB S/(N+D) at Nyquist to preserve signal integrity for downstream DSP algorithms. Use Value: 75mW power enables integration into compact, fanless DSP modules; HBEN-controlled byte read simplifies interface to 8-bit microcontrollers. |
| Multiplexed Sensor Data Acquisition | Test & Measurement Equipment |
Use Scenario: 16-channel thermocouple scanner where each channel uses an instrumentation amp driving LTC1275BCSW#PBF's high-Z AIN. IC Role / Device Role / Timing Role: Channel-sampling ADC with fast 2.7µs conversion and BUSY-driven sequencing for deterministic scan timing. Use Value: Internal clock synchronization prevents inter-channel timing jitter; 5pF hold-mode input capacitance minimizes crosstalk during multiplexed sampling. | Use Scenario: Portable oscilloscope front-end digitizing ±2.5V analog inputs with real-time waveform reconstruction. IC Role / Device Role / Timing Role: Core sampling component providing 12-bit resolution and 300ksps rate for 150kHz bandwidth display. Use Value: Full linear bandwidth of 200kHz ensures flat frequency response up to display limit; THD of –74dB at Nyquist preserves harmonic content. |
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 package. | Lower speed and wider input range; lacks integrated reference and internal clock. | Select when ±5V direct sensor interface is needed and system already provides precision reference. |
| MAX1166BCAP+ | 12-bit, 250ksps, ±2.5V input, internal 2.5V reference (±10ppm/°C), 20-pin SSOP package. | Lower max sampling rate and higher reference drift; smaller footprint but no HBEN byte-mux feature. | Select for space-constrained designs where 250ksps suffices and simplified 20-pin layout is prioritized. |
Compared with ADS7800U and MAX1166BCAP+, the LTC1275BCSW#PBF offers higher throughput (300ksps vs. 100/250ksps), tighter reference stability (±5ppm/°C vs. external or ±10ppm/°C), and unique HBEN-controlled byte multiplexing - making it optimal for microcontroller-based systems needing speed, accuracy, and flexible bus interfacing.
Availability
LTC1275BCSW#PBF is available at Aetrix Electronics and suitable for industrial process monitoring, digital signal processing front-ends, and multiplexed sensor data acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1275BCSW#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 LTC1275BCSW#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered specifically for high-speed, low-power, high-accuracy applications where integrated reference, clock, and sample-and-hold reduce system complexity and improve measurement repeatability.
FAQ
What is the operating temperature range for the LTC1275BCSW#PBF?
The LTC1275BCSW#PBF is specified for the commercial temperature range of 0°C to 70°C. This is indicated by the "B" grade suffix and confirmed in the Absolute Maximum Ratings table, where LTC1275BCN and LTC1275BCSW share identical operating temperature limits. The device's internal reference maintains ±5ppm/°C max drift across this range, ensuring consistent full-scale accuracy.
Does the LTC1275BCSW#PBF require an external clock source?
No, the LTC1275BCSW#PBF does not require an external clock source. It features an internally trimmed clock that automatically synchronizes to each RD pulse, guaranteeing ≤2.7µs conversion time without external timing components. This eliminates clock distribution skew and simplifies PCB layout compared to externally clocked ADCs.
How is the analog input range configured for the LTC1275BCSW#PBF?
The LTC1275BCSW#PBF is factory-configured for ±2.5V bipolar input range when operated from ±5V supplies (VDD = +5V, VSS = –5V). This is fixed by internal design - no external configuration pins or registers exist. The input voltage must stay within VSS – 0.3V to VDD + 0.3V to maintain specified accuracy, per Absolute Maximum Ratings.
What is the purpose of the HBEN pin on the LTC1275BCSW#PBF?
The HBEN (High Byte Enable) pin on the LTC1275BCSW#PBF controls data bus multiplexing and conversion initiation. When HBEN is LOW, the full 12-bit result appears simultaneously on D11–D0/8. When HBEN is HIGH, only DB11–DB8 appear on D11–D8, and conversion start is disabled - enabling flexible interfacing with 8-bit microcontrollers or reducing bus congestion.
Can the LTC1275BCSW#PBF operate from a single 5V supply?
No, the LTC1275BCSW#PBF cannot operate from a single 5V supply. It requires dual ±5V supplies (VDD = +5V, VSS = –5V) to support its ±2.5V bipolar input range. Attempting single-supply operation violates Absolute Maximum Ratings for VSS and will result in incorrect conversion or device damage. The LTC1273 variant is the single-supply (0V to 5V) counterpart in the same family.
LTC1275BCSW#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, -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#PBF FAQ
1.How can I place an order for LTC1275BCSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1275BCSW#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 LTC1275BCSW#PBF reliable?
The price and inventory of LTC1275BCSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1275BCSW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1275BCSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1275BCSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1275BCSW#PBF?
LTC1275BCSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1275BCSW#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 LTC1275BCSW#PBF?
For technical support, including LTC1275BCSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1275BCSW#PBF requirements.
6.How does Aetrix verify that LTC1275BCSW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1275BCSW#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 LTC1275BCSW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1275BCSW#PBF?
All LTC1275BCSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1275BCSW#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 LTC1275BCSW#PBF part is unused and in its original packaging.
Return procedure for LTC1275BCSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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