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Analog Devices Inc. LTC1400IS8#TRPBF
- Part No.:
- LTC1400IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1400IS8#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,497
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Product details
Overview
LTC1400IS8#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 battery-powered data acquisition systems requiring high DC accuracy and low-power operation.
For engineers reviewing the LTC1400IS8#TRPBF datasheet, LTC1400IS8#TRPBF pinout, LTC1400IS8#TRPBF application, or LTC1400IS8#TRPBF equivalent, key selection considerations include guaranteed ±1LSB INL/DNL over temperature, 70dB S/(N+D) at 100kHz, 3-wire SPI/MICROWIRE-compatible serial interface, and SO-8 package compatibility with board-level space constraints.
Technical Context
The LTC1400IS8#TRPBF implements a 12-bit capacitive DAC-based successive approximation architecture with internal zeroing switch and comparator offset nulling. Its sample-and-hold acquires analog input in ≤230ns (unipolar) or ≤200ns (bipolar), enabling full 400ksps throughput without external timing control.
It uses a 3-wire serial interface (CONV, CLK, DOUT) with no CS pin - conversion is initiated by CONV rising edge, and data is clocked out MSB-first on DOUT synchronized to CLK. The REFRDY bit in the serial word indicates internal reference settling after wake-up from Sleep mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes over temperature - ensures monotonicity in closed-loop control and precision measurement. |
| Sample Rate | 400ksps maximum - supports Nyquist-limited signal capture up to 200kHz with 72dB S/(N+D) performance. |
| DC Accuracy | ±1LSB integral nonlinearity (INL) and ±1LSB differential nonlinearity (DNL) - enables <1 LSB error in calibrated sensor interfaces. |
| Power Modes | Nap mode: 6mW (instant wake-up); Sleep mode: 30μW - extends battery life in intermittent-sampling applications. |
| Analog Input Range | 0V to 4.096V (unipolar, 1mV/LSB) or ±2.048V (bipolar) - matches standard voltage references and simplifies scaling for industrial sensors. |
| Reference Output | 2.42V ±10ppm/°C tempco, 1mA drive capability - provides stable reference for external circuitry without additional regulators. |
| Digital Interface | 3-wire SPI/MICROWIRE-compatible (CONV, CLK, DOUT) - reduces MCU GPIO count and eliminates need for CS or frame sync signals. |
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 | 4.75V–5.25V for unipolar; 4.75V–5.25V with VSS = –5V for bipolar - requires 10μF + 0.1μF bypass to GND. |
| AIN (Pin 2) | Analog input | High-impedance node accepting 0V–4.096V (unipolar) or ±2.048V (bipolar); draws ≤±1μA leakage during conversion. |
| VREF (Pin 3) | Internal reference output | 2.42V ±10ppm/°C; can be overdriven externally ≥2.45V for span adjustment; REFRDY bit reflects its readiness status. |
| GND (Pin 4) | Analog ground reference | Must connect directly to analog ground plane; all analog returns tie here - critical for noise rejection. |
| DOUT (Pin 5) | Serial data output | MSB-first 12-bit result plus REFRDY bit; tri-state Hi-Z when inactive - compatible with 3.3V/5V logic inputs. |
| CLK (Pin 6) | Serial clock input | 0.1–6.4MHz; minimum 50ns pulse width required to wake from Nap/Sleep - enables flexible MCU clock sourcing. |
| CONV (Pin 7) | Conversion start trigger | Active-high edge initiates sampling; double-pulse enters Nap, quadruple-pulse enters Sleep - no external timing logic needed. |
| VSS (Pin 8) | Negative supply rail | –5V for bipolar operation; tied to GND for unipolar - must be bypassed with 0.1μF ceramic to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated sample-and-hold | 200ns acquisition time in bipolar mode - eliminates external SH circuitry and reduces board area in compact designs. |
| Factory-trimmed reference | 2.42V ±0.02V initial accuracy, ±45ppm/°C max drift - removes need for external trimming in cost-sensitive applications. |
| Unipolar/bipolar auto-detection | VSS < GND automatically selects bipolar mode - simplifies firmware handling and enables dual-range front-end flexibility. |
| Low-noise analog input | 45pF input capacitance in sample mode, ≤1μA leakage in hold mode - minimizes settling burden on driving op amps like LT1363. |
| Reference-ready signaling | REFRDY bit embedded in serial output word - allows deterministic synchronization of data reads after Sleep wake-up. |
Applications
| Portable Data Loggers | Industrial Sensor Interfaces |
|---|---|
|
Use Scenario: Battery-powered environmental monitors capturing temperature, pressure, and humidity at 100–400Hz rates. IC Role / Device Role / Timing Role: Primary A/D converter performing unipolar 0–4.096V conversions with Nap-mode cycling between samples. Use Value: 30μW Sleep current extends 2xAA battery life to >2 years; ±1LSB INL ensures traceable calibration across operating temperature. |
Use Scenario: 4–20mA loop-powered transmitters conditioning RTD or strain-gauge signals in factory automation. IC Role / Device Role / Timing Role: Bipolar-input ADC digitizing ±2.048V bridge outputs with internal reference decoupling via 10μF/0.1μF network. Use Value: Auto-bipolar detection simplifies hardware design; 70dB S/(N+D) at 100kHz supports anti-alias filtering with relaxed component tolerances. |
| Handheld Test Equipment | Audio Signal Analysis Front-Ends |
|
Use Scenario: Pocket oscilloscopes and multimeters acquiring transient waveforms with 2.1μs conversion time. IC Role / Device Role / Timing Role: High-speed sampling ADC interfaced to ARM Cortex-M4 via 3-wire SPI, using CONV-triggered burst mode. Use Value: 400ksps rate enables 100kHz bandwidth capture; 3-wire interface reduces PCB routing complexity vs parallel bus alternatives. |
Use Scenario: Spectrum analyzers and audio analyzers digitizing line-level analog inputs up to 200kHz. IC Role / Device Role / Timing Role: Precision ADC capturing FFT-ready samples with 72dB S/(N+D) and –80dB THD at Nyquist. Use Value: Full linear bandwidth of 900kHz supports undersampling of RF-modulated audio bands; low IMD preserves intermodulation fidelity. |
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; 8-pin SOIC | Requires external reference and driver; lower speed; suited for ultra-low-voltage battery systems | Select when supply is <4.75V or internal reference is undesirable; verify external ref stability meets ±1LSB INL budget. |
| MAX11131ASA+ | 2.7–3.6V supply; internal 2.048V ref; 500ksps; 8-pin SOIC; SPI with CS | Higher speed but narrower supply range; includes chip select; optimized for 3.3V microcontroller integration | Choose for 3.3V-only systems needing faster sampling; confirm bipolar support via external level-shifting if required. |
Compared with LTC1400IS8#TRPBF, ADS7822U lacks integrated reference and sleep mode, increasing BOM count and power overhead, while MAX11131ASA+ offers higher speed but sacrifices bipolar operation and wide-supply flexibility - LTC1400IS8#TRPBF remains optimal for dual-supply, low-power, reference-integrated designs.
Availability
LTC1400IS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and handheld test equipment requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for LTC1400IS8#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 semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1400 series belongs to ADI's precision data acquisition portfolio, designed specifically for low-power, high-accuracy 12-bit sampling in space-constrained and battery-operated systems where integrated reference and flexible power modes are essential.
FAQ
What is the operating temperature range for the LTC1400IS8#TRPBF?
The LTC1400IS8#TRPBF is rated for industrial temperature operation from –40°C to +85°C. This grade is confirmed by the "I" suffix in the part number and applies to all DC and AC specifications including ±1LSB INL/DNL, 70dB S/(N+D), and 30μW Sleep current - making it suitable for deployment in harsh environments without derating.
Does the LTC1400IS8#TRPBF require an external reference?
No, the LTC1400IS8#TRPBF includes a factory-trimmed 2.42V internal bandgap reference with ±10ppm/°C tempco and 1mA drive capability. It is fully functional without external components, though VREF may be overdriven ≥2.45V for input span adjustment in bipolar mode - the internal reference remains active unless externally overridden.
How does the Nap and Sleep mode switching work on the LTC1400IS8#TRPBF?
The LTC1400IS8#TRPBF enters Nap mode after two consecutive CONV pulses and Sleep mode after four, both triggered by rising edges. Nap mode consumes 6mW and wakes instantly on next CONV; Sleep mode consumes 30μW and requires ~4ms for reference stabilization, signaled by the REFRDY bit in the serial output word - no external control logic is needed.
Can the LTC1400IS8#TRPBF operate in bipolar mode with only a single 5V supply?
No - bipolar operation requires both VCC = +5V and VSS = –5V supplies, as specified in the absolute maximum ratings and electrical characteristics tables. The LTC1400IS8#TRPBF detects VSS < GND to auto-enable bipolar mode, but VSS must be actively driven to –5V; unipolar operation uses VSS tied to GND with only +5V applied to VCC.
What is the purpose of the REFRDY bit in the LTC1400IS8#TRPBF serial output?
The REFRDY bit is the most significant bit (MSB) of the 13-bit serial word output by the LTC1400IS8#TRPBF and indicates whether the internal 2.42V reference has settled after wake-up from Sleep mode. When REFRDY = 1, the reference is stable and the subsequent 12-bit conversion result is valid - this eliminates guesswork in timing-critical firmware.
LTC1400IS8#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1400IS8#TRPBF FAQ
1.How can I place an order for LTC1400IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1400IS8#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 LTC1400IS8#TRPBF reliable?
The price and inventory of LTC1400IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1400IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1400IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1400IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1400IS8#TRPBF?
LTC1400IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1400IS8#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 LTC1400IS8#TRPBF?
For technical support, including LTC1400IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1400IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1400IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1400IS8#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 LTC1400IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1400IS8#TRPBF?
All LTC1400IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1400IS8#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 LTC1400IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1400IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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