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Analog Devices Inc. LTC1275BCN#PBF
- Part No.:
- LTC1275BCN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1275BCN#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,279
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Product details
Overview
LTC1275BCN#PBF 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 integral nonlinearity at commercial temperature range. It targets high-speed data acquisition systems requiring precision analog-to-digital conversion without external clocking or reference components.
For engineers reviewing the LTC1275BCN#PBF datasheet, LTC1275BCN#PBF pinout, LTC1275BCN#PBF application, or LTC1275BCN#PBF equivalent, key selection criteria include its ±2.5V input range, 24-pin PDIP package, internal synchronized clock, 70dB S/(N+D) at Nyquist, and compatibility with microprocessor parallel bus interfaces using HBEN-controlled 8-bit multiplexed output mode.
Technical Context
The LTC1275BCN#PBF implements a 12-bit capacitive DAC-based successive approximation register (SAR) architecture with integrated sample-and-hold, internal 2.42V bandgap reference, and factory-trimmed 2.7µs max conversion time. Its internal clock eliminates external timing source requirements and avoids asynchronous clock noise issues common in competing converters.
It supports two digital interface modes: full 12-bit parallel output (D11–D0/8) when HBEN is low, or 8-bit multiplexed output (D7–D0/8 then D11–D4) when HBEN is high - enabling flexible bus-width matching to 8-bit microcontrollers without external latches. Input settling is guaranteed within 600ns acquisition time under specified source impedance conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes; guarantees monotonic transfer function and unambiguous digital representation of analog input. |
| Sample Rate | 300ksps maximum; enables real-time capture of signals up to 150kHz Nyquist frequency for spectrum analysis or telecom processing. |
| Analog Input Range | ±2.5V bipolar; matches standard industrial sensor outputs and differential signal chains operating from ±5V supplies. |
| INL / DNL | ±1/2LSB max INL and ±3/4LSB max DNL (B-grade); ensures high DC accuracy for calibration-critical instrumentation applications. |
| S/(N + D) | 70dB at 150kHz input; delivers 11.4 effective bits at Nyquist, supporting high-fidelity audio and dynamic signal digitization. |
| Power Dissipation | 75mW typical at 300ksps; enables dense PCB layouts and low-thermal-load embedded systems without forced cooling. |
| Reference Output | 2.42V ±20mV, 25ppm/°C max tempco; provides stable scaling for DAC feedback loops or external circuit biasing with minimal drift. |
Pinout & Package
Package: 24-lead plastic DIP (PDIP), 0.300" wide body, through-hole mounting compatible with standard wave-solder processes and prototyping breadboards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (1) | Analog Input | Accepts ±2.5V differential-equivalent bipolar signal; high-impedance input draws ≤±1µA leakage current during sampling. |
| VREF (2) | Reference Output | Provides 2.42V reference voltage; requires 10µF tantalum + 0.1µF ceramic bypass to AGND for optimal noise performance. |
| 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 Output (MSB–D4) | Three-state outputs active when CS and RD are low; driven high/low per conversion result in parallel or multiplexed mode. |
| DGND (12) | Digital Ground | Ground reference for digital I/O; isolation from AGND reduces switching noise injection into analog path. |
| D3/11–D0/8 (13–16) | Data Output (D3–D0 / D11–D8) | Shared pins for lower byte (D3–D0) or upper nibble (D11–D8); HBEN selects functional mapping. |
| NC (17, 18) | No Connection | Unbonded pins; must remain unconnected to avoid parasitic coupling or mechanical stress on die bond wires. |
| HBEN (19) | High-Byte Enable | Controls data bus multiplexing: LOW enables full 12-bit parallel output; HIGH enables 8-bit sequential read mode. |
| RD (20) | Read Strobe | Active-low signal that initiates conversion when CS and HBEN are low; also enables output drivers during data transfer. |
| CS (21) | Chip Select | Active-low enable for all control inputs; prevents spurious conversions during bus contention or reset sequences. |
| BUSY (22) | Conversion Status | Open-collector output pulled low during conversion; used for polling or interrupt-driven data capture synchronization. |
| VSS (23) | Negative Supply | –5V supply rail for bipolar operation; must be bypassed to AGND with 0.1µF ceramic capacitor. |
| VDD (24) | Positive Supply | +5V supply rail; requires 10µF tantalum + 0.1µF ceramic bypass to AGND for stable internal clock and reference operation. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronized clock | Eliminates need for external crystal or oscillator, reducing BOM count and layout complexity while avoiding clock jitter-induced SNR degradation. |
| On-chip 2.42V reference | 25ppm/°C max tempco and ±20mV initial tolerance enable standalone operation without external reference ICs in cost-sensitive designs. |
| High-impedance analog input | ≤±1µA input leakage allows direct connection to high-output-impedance sensors or op-amp buffers without loading error. |
| ESD protection on all pins | Withstands ≥2kV HBM ESD events, improving robustness during handling, assembly, and field operation in industrial environments. |
| HBEN-controlled multiplexed output | Enables seamless interface to 8-bit microcontrollers via two-byte reads without external latch logic or address decoding overhead. |
Applications
| Industrial Data Acquisition | DSP-Based Signal Processing |
|---|---|
Use Scenario: Digitizing outputs from ±2.5V strain gauge bridges and RTD signal conditioners in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Primary 12-bit ADC capturing sensor data at 300ksps for real-time control loop execution and diagnostics. Use Value: ±1/2LSB INL ensures <0.01% full-scale linearity error over temperature, critical for metrology-grade measurement accuracy. | Use Scenario: Feeding time-domain samples to TI C6000 or Analog Devices SHARC DSPs for real-time spectral analysis and filtering in vibration monitoring systems. IC Role / Device Role / Timing Role: High-fidelity front-end ADC providing 70dB S/(N+D) at 150kHz to preserve signal integrity for FFT-based feature extraction. Use Value: Internal clock synchronization eliminates inter-chip timing skew, simplifying deterministic multi-channel sampling across multiple LTC1275BCN#PBF devices. |
| Audio Signal Digitization | Telecom Channel Monitoring |
Use Scenario: Converting line-level ±2.5V audio signals in professional audio interface equipment for recording and playback processing. IC Role / Device Role / Timing Role: Precision ADC delivering 11.4 effective bits at Nyquist to support 24-bit audio pipeline headroom without oversampling. Use Value: 77dB THD at Nyquist minimizes harmonic distortion artifacts in mid-band frequencies, preserving tonal fidelity for studio-grade applications. | Use Scenario: Monitoring analog voice channel levels and supervisory tones (20Hz–4kHz) in carrier-class TDM multiplexers and remote terminal units. IC Role / Device Role / Timing Role: Low-power, high-accuracy ADC operating from ±5V rails to match legacy telecom analog subsystems. Use Value: 75mW typical power enables integration into space-constrained line cards where thermal management is constrained by adjacent ASICs. |
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, external reference required, no internal clock, SOIC-24 package | Lower speed and higher system-level design effort due to external clock and reference sourcing | Select when lower power (35mW) and proven TI process reliability outweigh speed and integration needs. |
| MAX195BCPP | 16-bit, 100ksps, ±5V input range, external reference, 28-pin PDIP, higher cost | Higher resolution but half the throughput; requires external clock and reference decoupling network | Select when absolute precision >12-bit is mandatory and 100ksps suffices for the target signal bandwidth. |
Compared with ADS7800U and MAX195BCPP, the LTC1275BCN#PBF offers superior integration (internal clock + reference), higher throughput (300ksps vs ≤100ksps), and matched ±2.5V input range - making it optimal for cost-sensitive, space-constrained industrial DAQ systems needing plug-and-play ADC functionality.
Availability
LTC1275BCN#PBF is available at Aetrix Electronics and suitable for industrial data acquisition, DSP-based signal processing, and telecom channel monitoring requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for LTC1275BCN#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 LTC1275BCN#PBF belongs to the Linear Technology LTC127x family of integrated SAR ADCs designed specifically for high-speed, low-power, self-contained data acquisition in resource-constrained embedded systems.
FAQ
What is the operating temperature range for the LTC1275BCN#PBF?
The LTC1275BCN#PBF is rated for 0°C to 70°C commercial temperature operation. This range is explicitly defined in the Absolute Maximum Ratings table and confirmed across all DC and AC specifications for the B-grade version. The 'B' suffix denotes the commercial grade, and the 'N' package indicates the 24-lead PDIP variant. Operation outside this range may cause parameter shift beyond datasheet limits.
Does the LTC1275BCN#PBF require an external clock source?
No, the LTC1275BCN#PBF does not require an external clock source. It features an internally trimmed, synchronized clock that automatically initiates conversion upon each RD pulse, eliminating clock distribution complexity and jitter sensitivity. This internal clock delivers a guaranteed maximum conversion time of 2.7µs at 25°C and is factory-calibrated to ensure timing consistency across the operating temperature range.
What is the analog input voltage range supported by the LTC1275BCN#PBF?
The LTC1275BCN#PBF supports a ±2.5V bipolar analog input range when operated from ±5V supplies. This is explicitly specified in the VIN parameter table and distinguishes it from the LTC1273 (0V to 5V) and LTC1276 (±5V). The input must remain within VSS – 0.3V to VDD + 0.3V per Absolute Maximum Ratings, and full-scale accuracy requires VSS ≥ –2.45V and VDD ≥ 4.75V.
How is the reference voltage configured on the LTC1275BCN#PBF?
The LTC1275BCN#PBF provides a fixed 2.42V internal reference output at Pin 2 (VREF), which is factory-trimmed and temperature-compensated to ±20mV and 25ppm/°C max. It is intended to drive the internal DAC and can supply up to 1mA to external circuitry. For improved drift performance, the VREF pin may be overdriven with an external reference (e.g., LT1019A-2.5), but only for the LTC1275 - driving VREF is not recommended for LTC1273/LTC1276 variants.
What digital interface modes does the LTC1275BCN#PBF support?
The LTC1275BCN#PBF supports two digital interface modes controlled by the HBEN pin: when HBEN is low, all 12 bits (D11–D0/8) appear simultaneously on the data bus; when HBEN is high, the 12-bit result is multiplexed - first the lower 8 bits (D7–D0/8), then the upper 4 bits (D11–D4) - enabling direct connection to 8-bit microprocessors without external latches or glue logic.
LTC1275BCN#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, -2.45V ~ 5.25
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
LTC1275BCN#PBF FAQ
1.How can I place an order for LTC1275BCN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1275BCN#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 LTC1275BCN#PBF reliable?
The price and inventory of LTC1275BCN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1275BCN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1275BCN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1275BCN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1275BCN#PBF?
LTC1275BCN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1275BCN#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 LTC1275BCN#PBF?
For technical support, including LTC1275BCN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1275BCN#PBF requirements.
6.How does Aetrix verify that LTC1275BCN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1275BCN#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 LTC1275BCN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1275BCN#PBF?
All LTC1275BCN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1275BCN#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 LTC1275BCN#PBF part is unused and in its original packaging.
Return procedure for LTC1275BCN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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