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Analog Devices Inc. LTC1400CS8#TRPBF
- Part No.:
- LTC1400CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1400CS8#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,911
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Product details
Overview
LTC1400CS8#TRPBF from Analog Devices (formerly Linear Technology) is a complete 12-bit, 400ksps successive-approximation ADC with integrated sample-and-hold and precision 2.42V bandgap reference. It operates from single 5V or ±5V supplies, supports unipolar (0V–4.096V) and bipolar (±2.048V) input ranges, and features Nap (6mW) and Sleep (30μW) power-saving modes. It is used in portable instrumentation and high-speed data acquisition systems requiring low-power, high-accuracy analog-to-digital conversion.
For engineers reviewing the LTC1400CS8#TRPBF datasheet, LTC1400CS8#TRPBF pinout, LTC1400CS8#TRPBF application, or LTC1400CS8#TRPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, SO-8 package mapping, confirmed alternative parts with functional differences, and supply-chain support for industrial and embedded deployment.
Technical Context
The LTC1400CS8#TRPBF implements a 12-bit capacitive DAC-based successive approximation register (SAR) architecture with internal 200ns sample-and-hold. Its control logic enables immediate wake-up from Nap mode and delivers a serial 12-bit output via a 3-wire SPI/MICROWIRE-compatible interface (CONV, CLK, DOUT).
It features automatic unipolar/bipolar mode detection based on VSS voltage level and includes REFRDY signaling to indicate internal reference stabilization after Sleep mode wake-up. DC accuracy is guaranteed over temperature with ±1LSB INL/DNL and 45ppm/°C reference drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - ensures monotonicity and full-scale linearity across all operating conditions. |
| Sampling Rate | 400ksps maximum - supports Nyquist-limited signal capture up to 200kHz with 72dB S/(N+D) performance. |
| Power Dissipation | 75mW typical at 400ksps - enables compact thermal design without forced cooling in handheld instruments. |
| Analog Input Range | 0V to 4.096V (unipolar) or ±2.048V (bipolar) - matches standard 1mV/LSB scaling for direct sensor interface. |
| DC Accuracy | ±1LSB INL and DNL - guarantees sub-0.025% end-point linearity error for calibration-critical measurement systems. |
| Reference Output | 2.42V ±20mV, ±45ppm/°C drift - provides stable, factory-trimmed reference for external circuitry or span adjustment. |
| Digital Interface | 3-wire serial (CONV/CLK/DOUT), SPI/MICROWIRE compatible - reduces MCU GPIO count and simplifies PCB routing. |
Pinout & Package
Package: 8-lead plastic SOIC (SO-8), 150°C max junction temperature, θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Positive supply rail | Accepts 4.75V–5.25V for unipolar operation; powers internal reference, logic, and analog core. |
| AIN (Pin 2) | Analog input node | High-impedance input accepting 0V–4.096V (unipolar) or ±2.048V (bipolar); requires <200ns settling from driving amplifier. |
| VREF (Pin 3) | Internal reference output | 2.42V buffered reference; can source up to 1mA; must be decoupled with 10μF + 0.1μF for low-noise operation. |
| GND (Pin 4) | Analog ground reference | Primary analog return path; must connect directly to low-impedance analog ground plane, separate from digital GND. |
| DOUT (Pin 5) | Serial data output | 3-state CMOS output delivering 12-bit conversion result MSB-first; Hi-Z when not active; REFRDY bit included in data word. |
| CLK (Pin 6) | Serial clock input | Accepts 0.1–6.4MHz clock; rising edge clocks out data; minimum 50ns pulse width required for Nap/Sleep wake-up. |
| CONV (Pin 7) | Conversion start trigger | Active-high signal; rising edge initiates conversion; double-pulse enters Nap mode, quadruple-pulse enters Sleep mode. |
| VSS (Pin 8) | Negative supply rail | –5V for bipolar operation; tied to GND for unipolar mode; enables automatic mode detection and internal biasing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated sample-and-hold | 200ns acquisition time in bipolar mode - eliminates need for external S/H and reduces system component count. |
| Auto bipolar/unipolar detection | VSS voltage sensing - removes manual configuration; simplifies firmware and hardware design for dual-range applications. |
| REFRDY signaling | Embedded in serial data word - enables deterministic timing for post-Sleep conversions without polling or fixed delays. |
| Low-power Nap mode | 6mW consumption with instant wake-up - supports burst-mode sampling in battery-powered devices without latency penalty. |
| Internal 2.42V reference | ±45ppm/°C drift, 1mA drive capability - allows direct use in standalone systems and external span adjustment via VREF overdrive. |
| 3-wire serial interface | SPI/MICROWIRE compatibility - interoperates with common microcontrollers and DSPs without protocol translation logic. |
Applications
| Portable Data Loggers | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Battery-powered environmental monitoring units capturing temperature, pressure, and humidity over extended periods. IC Role / Device Role / Timing Role: Primary analog front-end ADC converting conditioned sensor outputs at 100–400ksps with minimal power overhead. Use Value: Nap mode (6mW) and Sleep mode (30μW) extend battery life while maintaining rapid response to event-triggered sampling. |
Use Scenario: PLC analog input modules acquiring signals from 4–20mA transmitters and RTDs in noisy factory environments. IC Role / Device Role / Timing Role: High-accuracy, isolated ADC stage providing 12-bit resolution and ±1LSB linearity for calibration-grade measurements. Use Value: Integrated 2.42V reference and ±2.048V bipolar range enable direct interface to differential industrial sensors without external reference or level-shifting. |
| Medical Instrumentation | Audio Test Equipment |
|
Use Scenario: Portable ECG and EEG devices requiring low-noise, low-power digitization of bio-potential signals. IC Role / Device Role / Timing Role: Front-end ADC with high impedance input and low leakage current (<±1μA) preserving signal integrity from high-impedance electrodes. Use Value: 72dB S/(N+D) at Nyquist and –80dB THD support accurate spectral analysis of physiological waveforms up to 200kHz. |
Use Scenario: Benchtop audio analyzers performing FFT-based distortion and noise measurements on amplifiers and codecs. IC Role / Device Role / Timing Role: Precision acquisition engine capturing high-fidelity audio-band signals with calibrated full-scale range and known linearity. Use Value: Guaranteed ±1LSB INL/DNL and 900kHz full linear bandwidth ensure measurement repeatability and traceable dynamic range beyond 11 effective bits. |
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 | 2.7–5.25V single-supply only; no internal reference; 200ksps max sampling rate. | Requires external reference and higher-speed clock; suited for lower-power, lower-throughput designs where board space is constrained. | Select when supply flexibility and ultra-low quiescent current (<1mW) outweigh speed and integration needs. |
| MAX11131AUT+ | 12-bit, 500ksps; internal 2.048V reference; SPI-only interface; no Nap/Sleep modes. | Higher throughput but lacks low-power state management; reference voltage differs, affecting full-scale scaling. | Select when maximum sampling rate is critical and continuous operation is preferred over duty-cycled power savings. |
Compared with ADS7822U and MAX11131AUT+, the LTC1400CS8#TRPBF uniquely combines integrated reference, dual-supply flexibility, Nap/Sleep power states, and guaranteed ±1LSB linearity - making it optimal for portable, battery-sensitive, and calibration-critical acquisition systems where integration and deterministic low-power behavior are essential.
Availability
LTC1400CS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and medical data acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1400CS8#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 LTC1400CS8#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for low-power, high-accuracy, easy-to-integrate analog-to-digital conversion in space- and energy-constrained embedded systems.
FAQ
What is the operating temperature range for the LTC1400CS8#TRPBF?
The LTC1400CS8#TRPBF is specified for the commercial temperature range of 0°C to 70°C. This is indicated by the 'C' suffix in the part number. For extended industrial operation (–40°C to 85°C), the LTC1400IS8#TRPBF variant is available. All DC and AC specifications, including ±1LSB INL/DNL and 72dB S/(N+D), are guaranteed across the full 0°C–70°C range for the LTC1400CS8#TRPBF.
Does the LTC1400CS8#TRPBF require an external reference?
No, the LTC1400CS8#TRPBF includes a factory-trimmed, temperature-compensated 2.42V internal reference available at Pin 3 (VREF). It can source up to 1mA and is suitable for most applications. External reference overdrive is supported for span adjustment in bipolar mode, but is not required for basic operation. The internal reference eliminates BOM cost and layout complexity associated with external references.
How does the Nap mode function on the LTC1400CS8#TRPBF?
The Nap mode on the LTC1400CS8#TRPBF reduces power dissipation to 6mW while retaining immediate wake-up capability - conversion begins within 350ns of the next CONV pulse. Nap mode is entered by applying two consecutive pulses to the CONV pin while CLK remains low. It is ideal for burst-mode acquisition where low standby power and zero-latency responsiveness are both required.
Can the LTC1400CS8#TRPBF operate with only a single 5V supply?
Yes, the LTC1400CS8#TRPBF supports unipolar operation with a single 5V supply (VCC = 4.75V–5.25V, VSS tied to GND), delivering 0V–4.096V input range. Bipolar operation (±2.048V) requires ±5V supplies (VCC = +5V, VSS = –5V). The device automatically detects VSS voltage level and configures its analog front-end accordingly - no external mode selection is needed.
What is the purpose of the REFRDY bit in the LTC1400CS8#TRPBF serial output?
The REFRDY bit is the MSB (bit 12) of the 12-bit serial data word output by the LTC1400CS8#TRPBF. It indicates whether the internal reference has settled after exiting Sleep mode: REFRDY = 1 means the reference is stable and the conversion result is valid; REFRDY = 0 means the reference is still settling. This eliminates fixed delay timing and enables deterministic, low-overhead synchronization in firmware.
LTC1400CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 400k
- 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:
- ±5V, 5V
- Voltage - Supply, Digital:
- ±5V, 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1400CS8#TRPBF FAQ
1.How can I place an order for LTC1400CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1400CS8#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 LTC1400CS8#TRPBF reliable?
The price and inventory of LTC1400CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1400CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1400CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1400CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1400CS8#TRPBF?
LTC1400CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1400CS8#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 LTC1400CS8#TRPBF?
For technical support, including LTC1400CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1400CS8#TRPBF requirements.
6.How does Aetrix verify that LTC1400CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1400CS8#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 LTC1400CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1400CS8#TRPBF?
All LTC1400CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1400CS8#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 LTC1400CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1400CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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