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Analog Devices Inc. LTC1408IUH#TRPBF
- Part No.:
- LTC1408IUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC1408IUH#TRPBF.pdf
- Description:
- IC ADC 14BIT SAR 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,422
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Product details
Overview
LTC1408IUH#TRPBF from Analog Devices (formerly Linear Technology) is a 14-bit, 600ksps simultaneous-sampling analog-to-digital converter with six differential input channels. It operates from a single 3V supply, draws 5mA active current, delivers 76dB SINAD at 100kHz, and features 90dB common-mode rejection - enabling high-accuracy multiphase power monitoring in compact industrial and portable systems.
For engineers reviewing the LTC1408IUH#TRPBF datasheet, LTC1408IUH#TRPBF pinout, LTC1408IUH#TRPBF application, or LTC1408IUH#TRPBF equivalent, key selection criteria include simultaneous sampling integrity, bipolar/unipolar mode flexibility via BIP pin, 3-wire serial interface timing compliance, and thermal performance across –40°C to +85°C industrial temperature range.
Technical Context
The LTC1408IUH#TRPBF implements six independent sample-and-hold circuits triggered synchronously on the rising edge of CONV, ensuring sub-200ps channel-to-channel aperture skew. Conversion proceeds at 100ksps per channel using a successive-approximation architecture clocked by an external SCK signal, with full 6-channel output requiring 96 SCLK cycles.
It supports dual input ranges: 0V–2.5V unipolar (BIP = LOW) or ±1.25V bipolar (BIP = HIGH), with output coding in straight binary or 2's complement respectively. Internal 2.5V bandgap reference (±15ppm/°C tempco) is overdrivable with external references up to VDD, and shutdown modes reduce power to 3.3mW (NAP) or 6µW (SLEEP).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with no missing codes - guarantees monotonicity and full-scale linearity for precision measurement. |
| Sampling Rate | 600ksps aggregate, 100ksps per channel - enables synchronized capture of fast transients across all six phases. |
| SINAD | 76dB at 100kHz - supports >12.3 ENOB for high-fidelity signal reconstruction in motor control feedback loops. |
| CMRR | 90dB at 100kHz - suppresses ground-loop noise and common-mode interference in noisy industrial environments. |
| Power Dissipation | 15mW active, 3.3mW NAP, 6µW SLEEP - allows battery-powered DAQ operation with rapid wake-up (<2ms reference settling). |
| Input Range | 0V–2.5V unipolar or ±1.25V bipolar differential - configurable per system dynamic range needs without external level-shifting. |
| Package | 32-pin QFN (5mm × 5mm) with exposed GND pad - provides low-inductance thermal path and compact PCB footprint. |
Pinout & Package
Package: 32-pin plastic QFN (5mm × 5mm), exposed thermal pad (Pin 33) soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0+ to CH5+ | Non-inverting analog inputs (6 pairs) | Differential voltage sensing nodes; each pair accepts rail-to-rail common-mode (0V–VDD) with ±1.25V or 0–2.5V differential swing. |
| CH0– to CH5– | Inverting analog inputs (6 pairs) | Completes differential pair; matched offset and gain tracking ensures <±0.5 LSB inter-channel mismatch. |
| CONV (Pin 30) | Conversion start trigger | Rising-edge synchronous latch initiates simultaneous sampling; pulse count determines NAP/SLEEP entry. |
| SCK (Pin 32) | Serial clock input | Drives internal timing logic; 16 clocks per enabled channel (max 96) define conversion + readout sequence. |
| SDO (Pin 1) | Three-state serial data output | MSB-first output of six 14-bit words; tri-states when not actively clocked to prevent bus contention. |
| BIP (Pin 29) | Bipolar/unipolar mode select | Static logic level sets input range and output coding format; requires full acquisition time before next conversion if changed. |
| SEL2–SEL0 (Pins 26–28) | Channel enable control | 3-bit code selects 1–6 active channels; fixed during conversion to avoid metastability in timing-critical sequences. |
| VREF (Pin 23) | Reference voltage source/sink | 2.5V internal bandgap; bypassed with 10µF capacitor to GND (Pin 22); overdrivable with external reference ≥2.55V. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling | Six independent S&H circuits with ≤200ps channel-to-channel skew - preserves phase relationships in multiphase systems. |
| Dual-range input configuration | Single BIP pin selects 0–2.5V unipolar (straight binary) or ±1.25V bipolar (2's complement) - eliminates external range-switching circuitry. |
| Low-power shutdown modes | NAP (3.3mW) and SLEEP (6µW) states with <2ms wake-up - extends battery life in portable data loggers without sacrificing responsiveness. |
| High CMRR & low leakage | 90dB CMRR at 100kHz and 1µA max input leakage - enables direct connection to high-impedance sensors without signal degradation. |
| Robust serial interface | 3-wire SCK/SDO/CONV protocol with guaranteed timing margins (t2 ≥3ns, t4 ≥4ns) - simplifies FPGA/CPLD integration without custom timing constraints. |
Applications
| Multiphase Power Monitoring | Multiphase Motor Control |
|---|---|
Use Scenario: Real-time voltage and current sampling across three-phase AC lines with neutral reference in UPS or PDU systems. IC Role / Device Role / Timing Role: Simultaneous 6-channel ADC captures instantaneous line-to-line and line-to-neutral voltages/currents at 100ksps per phase. Use Value: Enables accurate RMS, harmonic, and power factor calculation without inter-channel phase error-induced distortion. | Use Scenario: Closed-loop field-oriented control (FOC) of 3-phase BLDC or induction motors with position sensorless estimation. IC Role / Device Role / Timing Role: Synchronized sampling of three motor phase currents and two DC bus voltages for torque ripple minimization. Use Value: Sub-200ps aperture skew ensures precise current vector alignment, improving efficiency and reducing audible noise. |
| Data Acquisition Systems | Industrial Process Control |
Use Scenario: Modular 16-channel DAQ module with multiple LTC1408IUH#TRPBF units sharing a master clock and CONV signal. IC Role / Device Role / Timing Role: High-density, low-power ADC node delivering 14-bit resolution at 100ksps per channel with deterministic latency. Use Value: Reduces system-level power budget by 40% vs. discrete 12-bit solutions while maintaining DC accuracy (±1mV offset) and dynamic performance. | Use Scenario: Analog input conditioning for PLC I/O modules measuring thermocouple, RTD, and 4–20mA loop signals in factory automation. IC Role / Device Role / Timing Role: Front-end digitizer with programmable bipolar/unipolar range and integrated 2.5V reference for sensor signal normalization. Use Value: Eliminates need for external precision references and level-shifting op-amps, cutting BOM cost and layout area by 30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8686SIPWR | 16-bit, 500ksps, SPI interface, integrated PGA and reference; larger 32-QFN (6×6mm); higher power (22mW active) | Higher resolution suited for precision metrology; lacks true simultaneous sampling (interleaved 2-cycle capture) | Select when absolute DC accuracy >12-bit and programmable gain are required; avoid when sub-200ps channel alignment is critical. |
| AD7606C-18BSTZ | 18-bit, 1MSPS, parallel + SPI interface; 68-pin LQFP; requires external reference and ±5V supplies | Higher speed/resolution for oscilloscope-like capture; incompatible single-supply 3V operation and QFN footprint | Choose for lab-grade instrumentation needing >16-bit ENOB; reject for space-constrained portable designs requiring 3V-only operation. |
Compared with ADS8686SIPWR and AD7606C-18BSTZ, the LTC1408IUH#TRPBF offers superior channel synchronization and minimal PCB area in a 5mm QFN, making it optimal for embedded multiphase systems where timing fidelity and size outweigh raw resolution or gain flexibility.
Availability
LTC1408IUH#TRPBF is available at Aetrix Electronics and suitable for multiphase power monitoring, motor control feedback, and industrial data acquisition requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for LTC1408IUH#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 LTC1408IUH#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition portfolio, engineered specifically for simultaneous multi-channel sampling in space- and power-constrained industrial control and energy systems.
FAQ
What is the operating temperature range for the LTC1408IUH#TRPBF?
The LTC1408IUH#TRPBF is rated for industrial operation from –40°C to +85°C (I-grade). This range is fully specified for all key parameters including offset error (±1mV), gain error (±2mV), and SINAD (76dB at 100kHz), ensuring reliable performance in harsh environments such as factory floors and outdoor power equipment.
How does the BIP pin affect output data formatting in the LTC1408IUH#TRPBF?
When BIP = LOW, the LTC1408IUH#TRPBF outputs 14-bit straight binary codes for 0V–2.5V unipolar inputs; when BIP = HIGH, it outputs 2's complement codes for ±1.25V bipolar inputs. The BIP state must remain static during conversion and readout - changing it mid-sequence invalidates prior data and requires full acquisition time before next valid sample.
Can the LTC1408IUH#TRPBF operate with an external reference voltage?
Yes, the LTC1408IUH#TRPBF accepts external references from 2.55V up to VDD on the VREF pin. When overdriven, the internal bandgap is disabled, and reference tempco improves to ±1ppm/°C. External reference must be low-noise and capable of sourcing/sinking transient currents during conversion; a 10µF ceramic bypass capacitor to GND (Pin 22) remains mandatory.
What is the minimum acquisition time required between conversions for the LTC1408IUH#TRPBF?
The LTC1408IUH#TRPBF specifies 39ns typical acquisition time (tACQ) for full 14-bit accuracy at maximum throughput. This assumes low-source-impedance driving (<100Ω); with higher impedance, acquisition time increases linearly - e.g., 1kΩ source requires ~390ns. Buffer amplifiers with >40MHz closed-loop bandwidth are recommended for high-Z sensor interfaces.
How many channels can be enabled simultaneously using the SEL pins on the LTC1408IUH#TRPBF?
The SEL2–SEL0 pins (Pins 26–28) configure the number of active channels from 1 to 6. Codes 000–111 map directly to 1–6 channels; 101, 110, and 111 all enable all six channels. All SEL bits must be held static during conversion and readout - dynamic changes cause undefined behavior and data corruption in the LTC1408IUH#TRPBF.
LTC1408IUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 600k
- Number of Inputs:
- 6
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- S/H-MUX-ADC
- Ratio - S/H:ADC:
- 6:1
- 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:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 32-QFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1408IUH#TRPBF FAQ
1.How can I place an order for LTC1408IUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1408IUH#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 LTC1408IUH#TRPBF reliable?
The price and inventory of LTC1408IUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1408IUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1408IUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1408IUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1408IUH#TRPBF?
LTC1408IUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1408IUH#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 LTC1408IUH#TRPBF?
For technical support, including LTC1408IUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1408IUH#TRPBF requirements.
6.How does Aetrix verify that LTC1408IUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1408IUH#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 LTC1408IUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1408IUH#TRPBF?
All LTC1408IUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1408IUH#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 LTC1408IUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC1408IUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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