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Analog Devices Inc. LTC1277CSW#TRPBF
- Part No.:
- LTC1277CSW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1277CSW#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,651
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Product details
Overview
LTC1277CSW#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit successive-approximation ADC with differential analog input, 2-byte parallel read interface, and dual power-down modes (Nap at 180µA and Sleep at 1µA). It operates from single 5V or ±5V supplies, delivers 100ksps sampling rate, 72dB S/(N+D) at 100kHz input, and supports unipolar (0V–4.096V) or bipolar (±2.048V) input ranges - used in high-speed data acquisition systems interfacing with 3V/5V microprocessors.
For engineers reviewing the LTC1277CSW#TRPBF datasheet, LTC1277CSW#TRPBF pinout, LTC1277CSW#TRPBF application, or LTC1277CSW#TRPBF equivalent, key selection criteria include its differential input architecture, 2.42V internal reference with overdrive capability, Nap-mode wake-up time of 620ns, HBEN-controlled two-byte read timing, and SO-24 wide-body package compatibility with industrial temperature range (–40°C to 85°C).
Technical Context
The LTC1277CSW#TRPBF implements a capacitive DAC-based successive approximation register (SAR) with integrated sample-and-hold, internal synchronized clock, and factory-trimmed 2.42V bandgap reference. Its differential input stage (AIN+/AIN–) enables rejection of common-mode noise, while offset-binary encoding in bipolar mode ensures seamless sign-magnitude interpretation for DSP interfaces.
Control logic supports microprocessor interfacing via CS, CONVST, RD, and HBEN signals; BUSY indicates conversion status, REFRDY signals reference stabilization after Sleep wake-up, and NAP enables ultrafast low-power state entry/exit. The VLOGIC pin allows independent 2.7V–5.25V digital supply for mixed-voltage system integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer function for precision control loops. |
| Sampling Rate | 100ksps maximum - supports real-time spectral analysis up to Nyquist frequency of 50kHz. |
| S/(N + D) | 72.5dB typical at 100kHz input - enables >11.7 ENOB for high-fidelity signal capture in telecom processing. |
| Power Dissipation | 10mW at 100ksps - reduces thermal load in battery-powered portable instrumentation. |
| Input Range | 0V to 4.096V (unipolar) or ±2.048V (bipolar) - matches standard 1mV/LSB scaling for sensor interface calibration. |
| Wake-Up Time | 620ns from Nap mode - permits dynamic power gating between samples in multiplexed DAQ systems. |
| Reference Voltage | 2.420V ±20mV with ±10ppm/°C tempco - provides stable full-scale reference without external trimming. |
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 0V–4.096V unipolar or ±2.048V bipolar relative to AIN–; requires low-noise drive during conversion. |
| AIN– | Differential analog input (–) | Reference node for differential measurement; must remain quiet during conversion to avoid code errors. |
| VREF | 2.42V reference output | Provides internal reference; can be overdriven externally to adjust input span; bypass with 10µF + 0.1µF. |
| REFRDY | Reference ready indicator | Asserts high after Sleep wake-up when VREF settles - required before initiating first conversion. |
| NAP | Nap mode enable | Pull low to enter 180µA Nap mode; wake-up latency 620ns - ideal for brief idle intervals between samples. |
| HBEN | High byte enable | When high, outputs D11–D8 on pins D3/11–D0/8; enables sequential 8-bit reads for 8-bit bus systems. |
| D7–D4 / D3/11–D0/8 | 2-byte parallel data outputs | Delivers 12-bit result as two 8-bit bytes (MSB first); supports straight binary (unipolar) or offset binary (bipolar). |
| VLOGIC | Digital I/O supply | Accepts 2.7V–5.25V - allows direct connection to 3V or 5V processors without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| Differential input architecture | Rejects common-mode noise up to 100dB at 60Hz - critical for ECG and industrial sensor front-ends. |
| Two-stage power-down (Nap + Sleep) | Reduces average current from 2mA to 180µA (Nap) or 1µA (Sleep) - extends battery life in portable spectrum analyzers. |
| Internal synchronized clock | Eliminates need for external clock generator or crystal - simplifies PCB layout and reduces BOM count. |
| VREF overdrive capability | Allows external reference injection ≥2.45V - enables programmable input range adjustment for multi-sensor systems. |
| 2.7V–5.25V VLOGIC supply | Supports direct interfacing with 3V FPGAs or 5V microcontrollers - avoids voltage translation ICs and associated delays. |
Applications
| Portable Data Logger | Industrial Motor Control Feedback |
|---|---|
|
Use Scenario: Battery-powered environmental monitoring unit acquiring temperature, pressure, and humidity from multiple sensors at 100ksps aggregate rate. IC Role / Device Role / Timing Role: LTC1277CSW#TRPBF serves as the primary SAR ADC, digitizing conditioned analog outputs with differential inputs rejecting ground-loop noise across long sensor cables. Use Value: 1µA Sleep mode extends 2000mAh Li-ion battery life to >1 year in standby; 2.42V reference stability ensures <±0.5°C calibration drift over –40°C to 85°C. |
Use Scenario: Real-time current sensing in servo drives using shunt resistors, requiring high CMRR and fast settling under PWM switching noise. IC Role / Device Role / Timing Role: LTC1277CSW#TRPBF digitizes differential voltage across bidirectional shunts with 620ns Nap wake-up enabling per-PWM-cycle sampling. Use Value: 72dB S/(N+D) at 100kHz preserves resolution of 12-bit current feedback despite 20kHz switching harmonics; SO-24 package fits compact gate-driver PCBs. |
| Audio Signal Analyzer | Medical Ultrasound Beamformer |
|
Use Scenario: Handheld audio analyzer capturing line-level inputs for FFT-based THD and IMD measurements up to 96kHz. IC Role / Device Role / Timing Role: LTC1277CSW#TRPBF acts as front-end ADC with bipolar ±2.048V input range matching professional audio signal levels. Use Value: –82dB THD at 100kHz enables accurate harmonic analysis; offset-binary encoding simplifies signed arithmetic in ARM Cortex-M4 DSP firmware. |
Use Scenario: Channel-wise analog beamforming in portable ultrasound probes, where space-constrained PCBs demand minimal external components. IC Role / Device Role / Timing Role: LTC1277CSW#TRPBF digitizes echo return signals with integrated 2.42V reference eliminating external REF ICs and saving 3mm² board area per channel. Use Value: Full-power bandwidth of 2MHz supports undersampling of 3–5MHz ultrasound carriers; 12-bit resolution maintains SNR >70dB for tissue contrast detection. |
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, 200ksps, single-ended input, no Nap mode, 2.5V internal reference | Lower resolution and no differential input - suitable only for cost-sensitive non-critical sensing | Select only if 8-bit resolution suffices and differential rejection is unnecessary; not drop-in compatible due to pinout and interface differences. |
| AD7490BRUZ | 12-bit, 1MSPS, pseudo-differential input, SPI interface, 2.5V reference, 16-pin TSSOP | Higher speed but SPI-only interface and no Nap mode - requires FPGA/MCU SPI peripheral and additional decoupling | Choose when throughput >100ksps is mandatory and system already uses SPI infrastructure; incompatible pinout and power-down behavior. |
Compared with ADS7822U and AD7490BRUZ, the LTC1277CSW#TRPBF uniquely combines differential input, Nap-mode power gating, and parallel 2-byte read - making it optimal for embedded systems needing noise-immune 100ksps acquisition with minimal processor overhead and ultra-low quiescent current.
Availability
LTC1277CSW#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial motor control feedback, and medical ultrasound beamforming requiring stable component supply with guaranteed long-term availability.
Supply support for LTC1277CSW#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1277CSW#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition portfolio, designed specifically for low-power, high-accuracy SAR ADC applications in space-constrained and battery-operated systems.
FAQ
What is the maximum sampling rate supported by the LTC1277CSW#TRPBF?
The LTC1277CSW#TRPBF supports a maximum sampling rate of 100ksps, verified across the full industrial temperature range (–40°C to 85°C). This rate is achievable with proper timing adherence to tCONV ≤ 8µs and t7 ≥ 0.35µs delay between conversions. At this rate, the device draws 2mA from VDD and delivers 72.5dB S/(N+D) performance at 100kHz input frequency.
Does the LTC1277CSW#TRPBF support both unipolar and bipolar input configurations?
Yes, the LTC1277CSW#TRPBF supports both configurations: unipolar input range of 0V to 4.096V (with VSS = AGND) and bipolar range of ±2.048V (with VSS = –5V). In bipolar mode, output coding uses offset binary format, while unipolar mode uses straight binary - both are fully specified with ±1 LSB integral linearity error.
How does the Nap mode differ from Sleep mode in the LTC1277CSW#TRPBF?
Nap mode (enabled by pulling NAP low) reduces supply current to 180µA while retaining reference stability and enabling instant 620ns wake-up; Sleep mode (SLEEP low) draws only 1µA but requires 3.3–4.2ms for REFRDY assertion before sampling. Nap is ideal for microsecond-scale idle gaps; Sleep suits longer standby periods where wake-up latency is acceptable.
Can the internal reference of the LTC1277CSW#TRPBF be overdriven with an external voltage source?
Yes, the VREF pin of the LTC1277CSW#TRPBF can be overdriven with an external reference voltage ≥2.45V and ≤5V. This adjusts the full-scale input range proportionally - e.g., driving VREF to 5V yields ±4.23V bipolar range. The internal reference is disabled when external voltage exceeds 2.45V, and load regulation is specified at 2 LSB/mA.
What is the purpose of the HBEN pin on the LTC1277CSW#TRPBF?
The HBEN (High Byte Enable) pin controls data output sequencing: when high, the four most significant bits (D11–D8) appear on pins D3/11–D0/8, allowing 8-bit bus systems to read the 12-bit result in two cycles. When low, all eight pins output the low byte (D7–D0). This feature enables flexible interface design with both 8-bit and 16-bit microcontrollers without external latches.
LTC1277CSW#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):
- 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#TRPBF FAQ
1.How can I place an order for LTC1277CSW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1277CSW#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 LTC1277CSW#TRPBF reliable?
The price and inventory of LTC1277CSW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1277CSW#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1277CSW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1277CSW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1277CSW#TRPBF?
LTC1277CSW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1277CSW#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 LTC1277CSW#TRPBF?
For technical support, including LTC1277CSW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1277CSW#TRPBF requirements.
6.How does Aetrix verify that LTC1277CSW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1277CSW#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 LTC1277CSW#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1277CSW#TRPBF?
All LTC1277CSW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1277CSW#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 LTC1277CSW#TRPBF part is unused and in its original packaging.
Return procedure for LTC1277CSW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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