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Analog Devices Inc. LTC1277CSW#PBF
- Part No.:
- LTC1277CSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1277CSW#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,787
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Product details
Overview
LTC1277CSW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit successive-approximation ADC with differential analog input, 2-byte parallel readout, and dual power-down modes. It operates from single 5V or ±5V supplies, delivers 100ksps sampling rate, consumes only 10mW at full speed, and supports unipolar (0V–4.096V) or bipolar (±2.048V) input ranges. It is used in high-speed data acquisition systems requiring low-power, precision conversion with flexible digital interfacing.
For engineers reviewing the LTC1277CSW#PBF datasheet, LTC1277CSW#PBF pinout, LTC1277CSW#PBF application, or LTC1277CSW#PBF equivalent, key selection criteria include its 180µA Nap mode wake-up time (620ns), offset-binary bipolar output format, VLOGIC-compatible 3V/5V digital interface, and internal 2.42V reference with overdrive capability.
Technical Context
The LTC1277CSW#PBF implements a capacitive DAC-based successive approximation architecture with integrated sample-and-hold, internal synchronized clock, and factory-trimmed 2.42V bandgap reference. Its differential input stage rejects common-mode noise, and the 2-byte read protocol (via HBEN control) enables efficient 12-bit data transfer on 8-bit buses.
It supports two distinct low-power states: Nap mode (180µA, instant wake-up) and Sleep mode (1µA, REFRDY-synchronized wake-up requiring 3.3–4.2ms). Conversion timing is controlled by CONVST falling edge, with BUSY indicating active conversion and RD/HBEN enabling byte-selective data latching.
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 | 100ksps maximum - supports real-time signal capture up to 350kHz full-linear bandwidth. |
| Power Dissipation | 10mW at 100ksps - enables battery-powered portable instrumentation without thermal derating. |
| Input Range | 0V to 4.096V (unipolar) or ±2.048V (bipolar) - provides 1mV/LSB quantization step for high-resolution sensing. |
| S/(N + D) | 72.5dB typical at 100kHz input - ensures >11.7 ENOB for demanding spectral analysis applications. |
| THD | –82dB typical at 100kHz - minimizes harmonic contamination in audio and telecom signal chains. |
| Integral Linearity | ±1 LSB max - maintains accuracy across full scale without calibration in industrial sensor interfaces. |
Pinout & Package
Package: 24-lead plastic SO wide (SW), RoHS-compliant, JEDEC MS-013AC, 7.5mm body width, 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+ | Differential analog input (+) | Accepts voltage relative to AIN–; defines full-scale range when used differentially (0V–4.096V or ±2.048V). |
| AIN– | Differential analog input (–) | Reference node for differential input; must be low-noise and stable during conversion to avoid error. |
| VREF | 2.42V reference output | Internally trimmed bandgap source; can be overdriven externally to adjust input span; requires 10µF + 0.1µF bypass. |
| REFRDY | Reference ready indicator | Open-drain output goes high after Sleep wake-up confirms VREF stability - required before initiating conversion. |
| SLEEP | Deep power-down control | Active-low input enabling 1µA shutdown; disables internal circuitry except reference; triggers REFRDY assertion on exit. |
| NAP | Low-latency power-down control | Active-low input enabling 180µA standby; retains reference and logic state; wake-up latency ≤620ns to CONVST edge. |
| HBEN | High-byte enable | When high, pins D3/11–D0/8 output MSBs (DB11–DB8); when low, they output LSBs (DB7–DB0) - enables 8-bit bus multiplexing. |
| VLOGIC | Digital I/O supply | Independent 2.7V–5.25V rail sets logic swing for BUSY, REFRDY, and data outputs - allows direct interfacing with 3V microcontrollers. |
| CONVST | Conversion start trigger | Falling-edge sensitive; initiates SAR cycle only when CS is low; minimum pulse width 40ns. |
| BUSY | Conversion status flag | Active-low open-drain output; falls at CONVST edge and rises after tCONV (6–8µs) - used to latch valid data. |
Key Features
| Feature | Design Value |
|---|---|
| Differential input architecture | Rejects common-mode noise up to fIN = 100kHz, enabling accurate measurements in electrically noisy environments like motor control feedback loops. |
| Offset-binary bipolar output | Eliminates sign-extension complexity in DSP firmware; maps –2.048V to 0x0000 and +2.048V to 0xFFFF for seamless signed arithmetic. |
| 2-byte read protocol | Reduces bus width requirement from 12 to 8 bits via HBEN-controlled byte sequencing - simplifies interface with legacy 8-bit microprocessors. |
| Internal synchronized clock | Removes need for external timing components; guarantees deterministic conversion timing and eliminates clock jitter-induced aperture error. |
| VREF overdrive capability | Allows external precision reference (e.g., LT1019A-2.5) to replace internal 2.42V source - improves temperature drift from ±45ppm/°C to ±5ppm/°C. |
| Instant Nap-mode wake-up | 620ns latency from NAP↑ to first valid CONVST edge - supports burst-mode sampling in energy-constrained IoT sensor nodes. |
Applications
| Portable Data Loggers | Industrial PLC Analog Input Modules |
|---|---|
Use Scenario: Battery-operated environmental monitors capturing temperature, pressure, and humidity at 100Hz with 12-bit resolution over multi-day deployments. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned sensor outputs; Nap mode engaged between samples to extend battery life; BUSY-driven data latching ensures timing robustness. Use Value: 180µA Nap current and 620ns wake-up enable 99.9% duty-cycled operation while maintaining 100ksps readiness - achieving >1-year battery life on two AA cells. |
Use Scenario: DIN-rail mounted programmable logic controller acquiring 16-channel analog inputs from 4–20mA transmitters in factory automation. IC Role / Device Role / Timing Role: Channel-specific ADC per input path; differential AIN+/AIN– configuration rejects ground-loop noise from long sensor cables; REFRDY synchronization ensures calibrated startup after power cycling. Use Value: ±1 LSB integral linearity and ±2.048V bipolar range support direct 4–20mA loop translation without gain/offset trimming - reducing BOM cost and calibration labor. |
| Audio Signal Analyzers | Telecom Baseband Receivers |
Use Scenario: Handheld spectrum analyzer performing real-time FFT on audio-band signals (20Hz–20kHz) with dynamic range >90dB. IC Role / Device Role / Timing Role: High-fidelity front-end ADC feeding FPGA-based FFT engine; S/(N + D) ≥72dB at 100kHz ensures clean spectral bins; VLOGIC = 3.3V matches FPGA I/O voltage. Use Value: 72.5dB S/(N + D) and –82dB THD at 100kHz enable detection of low-level harmonics and intermodulation products critical for THD+N validation. |
Use Scenario: Wireless infrastructure baseband unit digitizing IF signals from 10MHz to 40MHz for digital downconversion in LTE/FDD receivers. IC Role / Device Role / Timing Role: Undersampling ADC operating beyond Nyquist; full-power bandwidth of 2MHz and flat S/(N + D) response up to 1MHz support alias-free IF sampling. Use Value: Full-linear bandwidth of 350kHz (S/(N + D) ≥68dB) and spurious-free dynamic range >70dB allow clean digitization of adjacent channel interference without analog pre-filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, 100ksps ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | SPI interface, 2.7V–5.25V supply, no internal reference, 1µA shutdown, 200ksps max | Requires external reference and serial interface logic; better suited for space-constrained PCBs with existing SPI infrastructure | Select when board layout favors serial interface and external reference offers better system-level drift performance |
| MAX11200EEE+ | Delta-sigma architecture, 2.7V–3.6V only, 16-bit resolution, 120SPS–1kSPS, 1.5µA typical | Optimized for ultra-low-power DC/low-frequency measurements (e.g., strain gauges), not high-speed AC signals | Select only for sub-1kSPS precision DC applications where 12-bit speed is unnecessary and 16-bit resolution is required |
Compared with ADS7822U and MAX11200EEE+, the LTC1277CSW#PBF uniquely combines parallel 2-byte readout, integrated reference, differential input, and sub-microsecond Nap-mode wake-up - making it optimal for mixed-signal systems needing deterministic timing, noise immunity, and rapid power-state transitions.
Availability
LTC1277CSW#PBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial process control, and communications test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1277CSW#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 LTC1277CSW#PBF belongs to ADI's legacy Linear Technology precision data acquisition portfolio, designed specifically for applications demanding low-power, high-speed, and high-accuracy analog-to-digital conversion in resource-constrained embedded systems.
FAQ
What is the maximum sampling rate of the LTC1277CSW#PBF?
The LTC1277CSW#PBF supports a maximum sampling rate of 100ksps, as confirmed by its timing specification tCONV (6–8µs) and fSAMPLE(MAX) parameter. This rate is achievable across the full commercial temperature range (0°C to 70°C) with proper decoupling and layout. At this rate, the device consumes 10mW and maintains 72.5dB S/(N + D) performance at 100kHz input frequency.
Does the LTC1277CSW#PBF require an external clock source?
No, the LTC1277CSW#PBF does not require an external clock source. It includes an internally synchronized clock generator that drives the successive approximation register and sample-and-hold circuit. This eliminates timing jitter from external sources and simplifies system design - no external crystal, oscillator, or clock distribution network is needed for basic operation.
How does the Nap mode differ from Sleep mode in the LTC1277CSW#PBF?
Nap mode (180µA, activated by pulling NAP low) retains reference stability and logic state with 620ns wake-up latency, enabling rapid burst sampling. Sleep mode (1µA, activated by pulling SLEEP low) powers down all circuitry except the reference, requiring REFRDY assertion (3.3–4.2ms delay) before conversion. Nap is for microsecond-scale duty cycling; Sleep is for second-scale idle periods.
Can the LTC1277CSW#PBF operate with a 3V digital interface?
Yes, the LTC1277CSW#PBF supports 3V digital interfacing via the VLOGIC pin, which accepts 2.7V–5.25V. When VLOGIC = 3V, all digital outputs (BUSY, REFRDY, D3/11–D0/8) swing between 0V and 3V, ensuring compatibility with 3V microcontrollers and FPGAs without level-shifting circuitry - a key advantage over fixed-5V-only ADCs.
What is the purpose of the HBEN pin on the LTC1277CSW#PBF?
The HBEN (High Byte Enable) pin on the LTC1277CSW#PBF controls data bus multiplexing: when high, pins D3/11–D0/8 output the four most significant bits (DB11–DB8); when low, they output the four least significant bits (DB7–DB0). This 2-byte read protocol allows full 12-bit data transfer over an 8-bit bus, reducing pin count and simplifying connection to legacy 8-bit processors.
LTC1277CSW#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):
- 100k
- Number of Inputs:
- 1
- Input Type:
- Differential, 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:
- External, Internal
- Voltage - Supply, Analog:
- 5V, -2.45V ~ 5.25
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1277CSW#PBF FAQ
1.How can I place an order for LTC1277CSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1277CSW#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 LTC1277CSW#PBF reliable?
The price and inventory of LTC1277CSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1277CSW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1277CSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1277CSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1277CSW#PBF?
LTC1277CSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1277CSW#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 LTC1277CSW#PBF?
For technical support, including LTC1277CSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1277CSW#PBF requirements.
6.How does Aetrix verify that LTC1277CSW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1277CSW#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 LTC1277CSW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1277CSW#PBF?
All LTC1277CSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1277CSW#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 LTC1277CSW#PBF part is unused and in its original packaging.
Return procedure for LTC1277CSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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