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Analog Devices Inc. LTC1404IS8#TRPBF
- Part No.:
- LTC1404IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1404IS8#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,919
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Product details
Overview
LTC1404IS8#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 600ksps successive-approximation ADC in SO-8 package, operating from single 5V or ±5V supplies. It integrates a 160ns sample-and-hold, precision 2.43V internal reference, and 3-wire SPI/MICROWIRE-compatible serial interface. Designed for high-speed data acquisition in portable instrumentation and signal processing systems.
For engineers reviewing the LTC1404IS8#TRPBF datasheet, LTC1404IS8#TRPBF pinout, LTC1404IS8#TRPBF application, or LTC1404IS8#TRPBF equivalent, key selection criteria include guaranteed no-missing-codes performance, ±1LSB INL/DNL over temperature, 69dB S/(N+D) at 100kHz, Nap/Sleep power modes (7.5mW / 60µW), and bipolar/unipolar input range flexibility (0–4.096V or ±2.048V).
Technical Context
The LTC1404IS8#TRPBF employs a capacitive DAC-based successive approximation architecture with internal zeroing switch and comparator offset nulling during acquisition. Its 12-bit SAR register drives a parallel-to-serial converter delivering output via DOUT on the rising edge of CLK, synchronized to CONV's active-high conversion trigger.
It supports dual supply configurations: unipolar mode (VSS = GND, VCC = 5V) and bipolar mode (VSS = –5V, VCC = 5V), with automatic mode detection based on VSS potential. The internal 2.43V reference is curvature-compensated and factory-trimmed, providing ≤45ppm/°C full-scale drift and enabling external overdrive for span adjustment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes over temperature - ensures monotonicity and deterministic code transitions in closed-loop control. |
| Sampling Rate | 600ksps maximum - supports Nyquist-limited input frequencies up to 300kHz with 72dB S/(N+D) at Nyquist. |
| Power Dissipation | 75mW typical in normal operation; 7.5mW in Nap mode; 60µW in Sleep mode - enables battery-powered and thermally constrained designs. |
| Analog Input Range | 0V to 4.096V (unipolar) or ±2.048V (bipolar) - matches standard 1mV/LSB scaling and simplifies sensor interfacing without external gain. |
| INL / DNL | ±1LSB over full temperature range - eliminates calibration overhead in precision measurement applications. |
| Reference Output | 2.43V ±20mV, ±45ppm/°C tempco - provides stable reference for external circuitry with <2.5ms wake-up time from Sleep mode. |
| Serial Interface | 3-wire SPI/MICROWIRE-compatible (CONV, CLK, DOUT) - reduces GPIO count and simplifies integration with microcontrollers and DSPs. |
Pinout & Package
Package: 8-lead plastic SOIC (SO-8), 1.27mm pitch, JEDEC MS-012AC, θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Positive supply rail | 4.75V–5.25V for unipolar or bipolar operation; requires 10µF + 0.1µF bypass to GND. |
| AIN (Pin 2) | Analog input | High-impedance node accepting 0–4.096V (unipolar) or ±2.048V (bipolar); 5pF hold capacitance minimizes charge injection error. |
| VREF (Pin 3) | Internal reference output | 2.43V bandgap reference; can source up to 1mA; externally overdrivable above 2.46V for bipolar span tuning. |
| GND (Pin 4) | Analog ground reference | Must connect directly to low-impedance analog ground plane to maintain DC accuracy and noise immunity. |
| DOUT (Pin 5) | Serial data output | 3-state CMOS output delivering 12-bit result MSB-first; Hi-Z when not actively shifting data. |
| VSS (Pin 8) | Negative supply rail | –5.25V to –2.45V for bipolar mode; tied to GND for unipolar; bypass required with 10µF + 0.1µF. |
| CONV (Pin 7) | Conversion start | Active-high edge-triggered signal; double pulse enters Nap mode, quadruple pulse enters Sleep mode. |
| CLK (Pin 6) | Serial clock input | Accepts 0.1–9.6MHz clock; minimum 40ns pulse width; synchronizes DOUT bit shifts and wakes device from low-power states. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated sample-and-hold | 160ns acquisition time in bipolar mode enables direct connection to fast op amps like LT1363 without external hold circuitry. |
| Auto-detect bipolar/unipolar mode | VSS voltage level automatically configures input range and internal biasing - eliminates mode-select pins and firmware configuration. |
| REFRDY flag in serial word | Indicates internal reference stability after Sleep wake-up - allows deterministic timing for first valid conversion without fixed delay. |
| Low-leakage analog input | ±1µA max leakage during conversion - preserves accuracy when driven by high-impedance sensors or passive filters. |
| Hi-Z DOUT with controlled drive strength | Supports bus sharing and mixed-voltage logic interfaces; VOH/VOL specified down to 1.6mA sink/source. |
Applications
| Portable Data Loggers | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Battery-powered environmental monitoring units capturing temperature, pressure, and humidity with 12-bit resolution over extended field deployments. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor outputs; operates in Nap mode between samples to extend battery life. Use Value: 60µW Sleep mode and 7.5mW Nap mode reduce average system power; integrated reference eliminates external component count and layout sensitivity. | Use Scenario: DIN-rail mounted PLC analog input modules requiring ±10V or 4–20mA signal digitization with industrial-grade accuracy and thermal stability. IC Role / Device Role / Timing Role: High-fidelity front-end ADC handling bipolar inputs from current-loop receivers and voltage dividers; referenced to isolated 2.43V rail. Use Value: ±1LSB INL/DNL over –40°C to +85°C ensures calibration retention across ambient extremes; 45ppm/°C reference drift meets IEC 61000-6-2 immunity requirements. |
| DSP-Based Audio Preprocessing | RF Intermediate Frequency Sampling |
Use Scenario: Low-latency audio capture stage in voice-controlled edge devices, feeding 12-bit samples to on-chip DSP for noise suppression and keyword spotting. IC Role / Device Role / Timing Role: Real-time analog front-end with deterministic 1.36µs conversion time and synchronous serial output aligned to DSP clock domain. Use Value: 72dB S/(N+D) at Nyquist and –80dB THD support wide dynamic range voice capture; 3-wire interface minimizes routing congestion on dense PCBs. | Use Scenario: Direct IF sampling in narrowband wireless receivers (e.g., ISM-band telemetry), digitizing 200–300kHz bandpass-filtered signals prior to digital demodulation. IC Role / Device Role / Timing Role: Undersampling ADC operating at 600ksps to capture >200kHz IF signals within its 5MHz full-power bandwidth. Use Value: 71dB SINAD at 300kHz and –82dB IMD enable clean spectral reconstruction; low aperture jitter (<50ps) preserves phase coherence across multiple channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, medium-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit, 200ksps, single-supply only (2.7–5.25V), no internal reference, SPI-only interface | Lacks bipolar mode and integrated reference; requires external REF and level-shifting for ±5V inputs | Choose for ultra-low-power (1.5mW) single-supply systems where bipolar input and reference integration are unnecessary. |
| MAX11131AUT+ | 12-bit, 500ksps, internal 2.048V reference, ±5V tolerant inputs, SPI/MICROWIRE compatible | Lower reference voltage (2.048V vs 2.43V) yields coarser 0.5mV/LSB step; no Sleep mode (15mW min) | Choose when matching legacy 2.048V reference ecosystems or when 500ksps suffices and lower quiescent current than Nap mode is critical. |
Compared with ADS7822U and MAX11131AUT+, the LTC1404IS8#TRPBF uniquely combines 600ksps speed, bipolar/unipolar auto-detection, sub-100µW Sleep mode, and 2.43V reference - making it optimal for portable test equipment and multi-range industrial DAQ where supply flexibility and minimal external components are decisive.
Availability
LTC1404IS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor signal conditioning, and DSP-based audio preprocessing requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across –40°C to +85°C.
Supply support for LTC1404IS8#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 LTC1404IS8#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered for high-speed, low-power, and high-accuracy analog-to-digital conversion in space- and energy-constrained embedded systems.
FAQ
What is the operating temperature range for the LTC1404IS8#TRPBF?
The LTC1404IS8#TRPBF is rated for industrial operation from –40°C to +85°C (I-grade). All key specifications-including ±1LSB INL/DNL, 69dB S/(N+D) at 100kHz, and 45ppm/°C reference drift-are guaranteed across this full range, making it suitable for harsh-environment deployments without derating.
Does the LTC1404IS8#TRPBF require an external reference?
No, the LTC1404IS8#TRPBF includes a factory-trimmed, temperature-compensated 2.43V internal reference accessible at Pin 3 (VREF). It can source up to 1mA and supports external overdrive for bipolar span adjustment. An external reference is optional and only needed if tighter initial accuracy or lower drift than ±45ppm/°C is required.
How does the Nap mode function on the LTC1404IS8#TRPBF?
The LTC1404IS8#TRPBF enters Nap mode upon receiving two consecutive pulses on CONV while CLK is low. In Nap mode, it consumes just 7.5mW and wakes instantly-within 350ns-to begin conversion on the next CONV rising edge, eliminating startup latency in burst-sampling applications.
Can the LTC1404IS8#TRPBF interface directly with a 3.3V microcontroller?
Yes, the LTC1404IS8#TRPBF's DOUT pin is CMOS-compatible and specifies VOH ≥ 4.0V at VCC = 4.75V with 200µA sink, ensuring reliable logic-high recognition by 3.3V controllers. CONV and CLK inputs accept 2.0V VIH minimum, allowing direct 3.3V logic drive without level shifters.
What is the minimum acquisition time for the LTC1404IS8#TRPBF in unipolar mode?
In unipolar mode (VSS = GND), the LTC1404IS8#TRPBF requires a minimum 200ns acquisition time to fully settle the internal sample-and-hold capacitor. This allows use with fast-settling op amps such as the LT1363 (60ns to 0.5LSB) while maintaining full 12-bit accuracy at 600ksps.
LTC1404IS8#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):
- 600k
- 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:
- -
LTC1404IS8#TRPBF FAQ
1.How can I place an order for LTC1404IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1404IS8#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 LTC1404IS8#TRPBF reliable?
The price and inventory of LTC1404IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1404IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1404IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1404IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1404IS8#TRPBF?
LTC1404IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1404IS8#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 LTC1404IS8#TRPBF?
For technical support, including LTC1404IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1404IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1404IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1404IS8#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 LTC1404IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1404IS8#TRPBF?
All LTC1404IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1404IS8#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 LTC1404IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1404IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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