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Analog Devices Inc. LTC1401CS8#PBF
- Part No.:
- LTC1401CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1401CS8#PBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,065
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Product details
Overview
LTC1401CS8#PBF from Analog Devices (formerly Linear Technology) is a complete 12-bit, 200ksps successive-approximation ADC with integrated 1.2V precision reference, sample-and-hold, and 3-wire SPI/MICROWIRE-compatible serial interface. It operates from a single 3V supply, delivers ±1LSB INL/DNL, 68dB S/(N+D) at 50kHz, and supports unipolar 0V–2.048V input range in SO-8 package for portable data acquisition.
For engineers reviewing the LTC1401CS8#PBF datasheet, LTC1401CS8#PBF pinout, LTC1401CS8#PBF application, or LTC1401CS8#PBF equivalent, key selection criteria include its 315ns acquisition time, 1.5mW Nap mode power, REFRDY signal for reference-ready indication, and compatibility with low-power microcontrollers and DSPs requiring compact serial ADC interfaces.
Technical Context
The LTC1401CS8#PBF implements a capacitive DAC-based successive approximation architecture with internal sample-and-hold and factory-trimmed bandgap reference. Its conversion cycle begins on CONV rising edge and completes in 4.1µs with 3.2MHz clock, delivering 12-bit straight-binary output via DOUT synchronized to CLK.
Power management includes three distinct low-power states: Nap mode (1.5mW, reference active, 350ns wake-up), Sleep mode (19.5µW, reference and comparator disabled, 3ms VREF wake-up), and Shutdown mode (13.5µW, SHDN pin asserted). The REFRDY bit precedes each 12-bit data word to indicate reference stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes over temperature - guarantees monotonicity and full code coverage in embedded control loops. |
| Sampling Rate | 200ksps maximum - supports real-time acquisition of audio-band signals up to 100kHz Nyquist frequency. |
| INL / DNL | ±1LSB typical - enables high-accuracy sensor interfacing without calibration in industrial monitoring systems. |
| S/(N+D) | 68dB at 50kHz - provides >11 effective bits for clean spectral analysis in spectrum analyzers and digital radios. |
| Power (Active) | 15mW at 200ksps - allows battery operation for >100 hours in handheld instruments with 3V/500mAh supply. |
| Analog Input Range | 0V to 2.048V unipolar - matches standard 12-bit LSB step of 0.5mV for direct voltage measurement scaling. |
| Reference Output | 1.200V ±20mV, ±45ppm/°C drift - supplies stable reference for external circuitry while enabling span adjustment via VREF overdrive. |
Pinout & Package
Package: 8-lead plastic SOIC (SO-8), 150mil width, JEDEC MS-012AC, RoHS-compliant #PBF marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Positive supply input | 3V nominal (2.7–3.6V); requires 10µF + 0.1µF bypass to GND for noise-sensitive analog performance. |
| AIN (Pin 2) | Analog input node | High-impedance unipolar input (0–2.048V); draws ≤±1µA leakage during conversion, 45pF capacitance in sample mode. |
| VREF (Pin 3) | Internal reference output | 1.2V bandgap source; supplies up to 1mA; must be decoupled and can be overdriven ≥1.25V for full-scale adjustment. |
| GND (Pin 4) | Analog ground reference | Primary return path for analog circuitry; must connect directly to analog ground plane, separate from digital ground. |
| DOUT (Pin 5) | Serial data output | 3-wire SPI-compatible output; transmits REFRDY bit followed by 12-bit straight-binary word on CLK rising edge. |
| CLK (Pin 6) | Serial clock input | Accepts 0.1–3.2MHz clock; minimum 60ns pulse width required to exit Nap/Sleep modes. |
| CONV (Pin 7) | Conversion start trigger | Rising-edge initiated; two pulses (CLK low) enter Nap, four pulses enter Sleep; controls internal SAR timing. |
| SHDN (Pin 8) | Shutdown enable | Active-low; pulls device into 13.5µW shutdown state; REFRDY goes low until SHDN returns high. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated reference | Factory-trimmed 1.200V ±20mV output with ±45ppm/°C tempco - eliminates external reference component and layout area in space-constrained designs. |
| 3-wire serial interface | SPI and MICROWIRE-compatible with REFRDY-first protocol - simplifies connection to TMS320C50, ARM Cortex-M, and other resource-limited processors. |
| Nap mode wake-up | 350ns transition from Nap to active conversion - enables burst-mode sampling with minimal latency in event-triggered data capture. |
| Input charge injection control | 315ns acquisition time with <5pF hold-mode capacitance - reduces op-amp settling burden and supports use of rail-to-rail amplifiers like LT1498/LT1630. |
| Unipolar transfer function | 0V = 0x000, 2.048V = 0xFFF, 1LSB = 0.5mV - enables direct voltage-to-code mapping without software offset correction in measurement firmware. |
Applications
| Portable Instrumentation | Digital Radio Front-End |
|---|---|
Use Scenario: Handheld multimeter acquiring DC voltage and thermocouple signals at 100ksps. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog inputs; provides REFRDY-synchronized conversions for deterministic firmware timing. Use Value: 15mW active power and 1.5mW Nap mode extend battery life; ±1LSB linearity ensures calibrated accuracy without per-unit trimming. | Use Scenario: IF sampling stage in SDR receiver capturing 50kHz baseband signals. IC Role / Device Role / Timing Role: High-fidelity sampling front-end; 68dB S/(N+D) preserves SNR for demodulation algorithms. Use Value: Full linear bandwidth of 50kHz meets LTE/Bluetooth channel bandwidth requirements; 3-wire interface minimizes GPIO usage on host SoC. |
| Spectrum Analyzer Channel | Multiplexed Sensor Array |
Use Scenario: 12-bit channel ADC in benchtop spectrum analyzer performing real-time FFT on 100kHz bandwidth. IC Role / Device Role / Timing Role: Precision digitizer feeding FPGA-based FFT engine; uses DOUT/CLK timing for deterministic data capture. Use Value: –72dB THD at 50kHz suppresses harmonic artifacts; 2MHz full-power bandwidth accommodates transient overshoots. | Use Scenario: Central ADC in 8-channel industrial sensor hub reading RTDs and strain gauges. IC Role / Device Role / Timing Role: Shared serial ADC serving multiple channels via external multiplexer; leverages Nap mode between samples. Use Value: 19.5µW Sleep mode cuts idle power across 8 channels; VREF output powers external gain stages, reducing BOM count. |
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 | 200ksps, 12-bit, 2.7–5.25V supply, no internal reference - requires external 2.5V reference and driver op-amp. | Higher supply flexibility but increased BOM and layout complexity; lacks REFRDY signal and Nap mode. | Select when wider supply range or external reference control is needed; avoid if minimizing component count is critical. |
| MAX1113ECUA+ | 250ksps, 12-bit, 2.7–3.6V, internal 2.048V reference, SPI-only interface - no MICROWIRE compatibility or REFRDY bit. | Higher speed but no reference-ready flag; different timing protocol increases firmware porting effort. | Select for marginally faster throughput where reference stability indication is handled externally; verify timing alignment with host processor. |
Compared with ADS7822U and MAX1113ECUA+, the LTC1401CS8#PBF uniquely integrates reference, REFRDY signaling, and three-tier power management in SO-8 - reducing system-level design effort for portable and battery-powered instrumentation where deterministic startup and low idle power are essential.
Availability
LTC1401CS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, digital radio front-ends, spectrum analyzer channels, and multiplexed sensor arrays requiring stable component supply and long-term obsolescence support.
Supply support for LTC1401CS8#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1401CS8#PBF belongs to ADI's legacy Linear Technology precision data converter family, designed specifically for low-power, high-accuracy sampling in portable and space-constrained embedded systems where integration, reliability, and ease of use are prioritized.
FAQ
What is the absolute maximum supply voltage for the LTC1401CS8#PBF?
The absolute maximum supply voltage (VCC) for the LTC1401CS8#PBF is 7V. Operation above 3.6V violates recommended conditions and risks permanent damage. The device is specified for 2.7V to 3.6V operation, with typical performance at 3.0V. Exceeding 7V may cause latch-up or junction breakdown, as stated in the Absolute Maximum Ratings table of the LTC1401CS8#PBF datasheet.
Does the LTC1401CS8#PBF require an external reference?
No, the LTC1401CS8#PBF does not require an external reference - it includes a factory-trimmed 1.200V ±20mV internal bandgap reference accessible at Pin 3 (VREF). This reference supports up to 1mA load and can be overdriven externally for full-scale adjustment, but external reference use is optional and only needed for enhanced accuracy or different voltage spans.
How does the REFRDY signal function in the LTC1401CS8#PBF?
The REFRDY signal in the LTC1401CS8#PBF is a status bit transmitted as the first bit of every serial output word on DOUT. It indicates whether the internal 1.2V reference has settled after exiting Sleep or Shutdown mode. A high REFRDY bit means the reference is stable and the subsequent 12-bit conversion result is valid; low indicates the reference is still ramping and data should be discarded.
What are the timing requirements to enter Nap mode on the LTC1401CS8#PBF?
To enter Nap mode on the LTC1401CS8#PBF, hold CLK low and apply two falling edges on the CONV pin. The device transitions within 350ns and draws 1.5mW. This sequence is defined in the Applications Information section and verified in Figure 11 of the LTC1401CS8#PBF datasheet; violating the CLK low condition or using incorrect pulse count results in undefined behavior.
Can the LTC1401CS8#PBF interface directly with a TMS320C50 DSP?
Yes, the LTC1401CS8#PBF interfaces directly with the TMS320C50 DSP using its 3-wire SPI/MICROWIRE-compatible interface, as confirmed in Typical Application TA04a of the LTC1401CS8#PBF datasheet. The DOUT, CLK, and CONV pins connect to TDR, TCLKX, and a GPIO respectively, with frame sync generated externally - no level-shifting or protocol translation is required.
LTC1401CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- 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:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1401CS8#PBF FAQ
1.How can I place an order for LTC1401CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1401CS8#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 LTC1401CS8#PBF reliable?
The price and inventory of LTC1401CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1401CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1401CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1401CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1401CS8#PBF?
LTC1401CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1401CS8#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 LTC1401CS8#PBF?
For technical support, including LTC1401CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1401CS8#PBF requirements.
6.How does Aetrix verify that LTC1401CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1401CS8#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 LTC1401CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1401CS8#PBF?
All LTC1401CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1401CS8#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 LTC1401CS8#PBF part is unused and in its original packaging.
Return procedure for LTC1401CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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