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Analog Devices Inc. LTC1408IUH#PBF
- Part No.:
- LTC1408IUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC1408IUH#PBF.pdf
- Description:
- IC ADC 14BIT SAR 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:137
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Product details
Overview
LTC1408IUH#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 600ksps simultaneous-sampling analog-to-digital converter with six differential input channels, 76dB SINAD, 90dB common-mode rejection, and 3V single-supply operation - designed for high-precision multiphase power measurement and motor control systems.
For engineers reviewing the LTC1408IUH#PBF datasheet, LTC1408IUH#PBF pinout, LTC1408IUH#PBF application, or LTC1408IUH#PBF equivalent, key selection considerations include simultaneous sampling timing integrity, bipolar/unipolar mode configuration via BIP pin, 3-wire serial interface compatibility, and thermal performance in the 5mm × 5mm QFN package across –40°C to +85°C industrial temperature range.
Technical Context
The LTC1408IUH#PBF implements six independent sample-and-hold circuits triggered synchronously on the rising edge of CONV, enabling true simultaneous acquisition across all six differential pairs before sequential 14-bit conversion at 100ksps per channel. Its internal 2.5V bandgap reference supports both unipolar (0V–2.5V) and bipolar (±1.25V) differential input ranges, selected by the BIP pin state.
Conversion sequencing is controlled by SEL2/SEL1/SEL0, allowing dynamic selection of 1–6 active channels without reconfiguration overhead. The 3-wire serial interface outputs 96 bits (six 14-bit words, MSB-first) in exactly 96 SCK cycles, with precise timing constraints ensuring deterministic latency and channel-to-channel aperture skew ≤200ps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with no missing codes - guarantees monotonicity and full-scale linearity for precision measurement applications. |
| Sampling Rate | 600ksps aggregate (100ksps per channel) - enables real-time capture of fast transients across all six phases simultaneously. |
| SINAD | 76dB at 100kHz - ensures ≥12.3 effective bits for high-fidelity signal reconstruction in noise-sensitive systems. |
| CMRR | 90dB at 100kHz - suppresses ground-loop interference and common-mode noise in industrial sensor interfaces. |
| Power Dissipation | 15mW active mode, 6µW Sleep mode - supports battery-powered portable instrumentation and low-thermal-footprint designs. |
| Input Range | 0V–2.5V unipolar or ±1.25V bipolar differential - configurable via BIP pin; rail-to-rail common-mode input (0V to VDD) simplifies front-end design. |
| Package | 32-pin QFN (5mm × 5mm) with exposed thermal pad - provides low-inductance grounding and thermal resistance (θJA = 34°C/W) for stable ADC performance. |
Pinout & Package
Package: 32-pin plastic QFN (5mm × 5mm), exposed pad (Pin 33) soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0+ to CH5+ | Non-inverting analog inputs (6 pairs) | Differential input pairs sampled simultaneously; each accepts 0V–VDD common-mode voltage with ±1.25V or 0V–2.5V differential swing. |
| CH0– to CH5– | Inverting analog inputs (6 pairs) | Completes differential pair; matched input capacitance (13pF) and leakage (1µA) ensure channel-to-channel gain/offset tracking. |
| CONV (Pin 30) | Convert start trigger | Rising-edge synchronous latch initiates simultaneous sampling; also controls Nap/Sleep entry via pulse count on fixed SCK state. |
| SDO (Pin 1) | Three-state serial data output | MSB-first 14-bit words for CH0–CH5 output over 96 SCK cycles; OVDD-referenced for flexible logic-level interfacing. |
| SEL2/SEL1/SEL0 (Pins 26–28) | Channel selection control | Binary-encoded selection of 1–6 active channels per conversion sequence; must remain static during conversion and readout. |
| BIP (Pin 29) | Bipolar/unipolar mode select | Logic-high enables ±1.25V differential input (2's complement output); logic-low enables 0V–2.5V range (straight binary output). |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling | Six independent S&H circuits triggered by single CONV edge - eliminates phase skew between channels for accurate multiphase waveform analysis. |
| Configurable input range | BIP pin selects unipolar (0V–2.5V) or bipolar (±1.25V) mode - enables seamless integration with current-sense amplifiers or isolated voltage sensors. |
| Low-power shutdown modes | SLEEP (6µW) and NAP (3.3mW) states - reduce system power between measurements without losing configuration or reference stability. |
| High CMRR & low aperture skew | 90dB CMRR at 100kHz and ≤200ps channel-to-channel aperture skew - preserves signal integrity in noisy industrial environments. |
| Internal 2.5V reference | 15ppm/°C tempco, 2ms wake-up settling - eliminates external reference component while maintaining accuracy across –40°C to +85°C. |
Applications
| Multiphase Power Measurement | Multiphase Motor Control |
|---|---|
Use Scenario: Real-time monitoring of voltage and current across three-phase AC inverters or PFC stages with harmonic analysis up to 50MHz bandwidth. IC Role / Device Role / Timing Role: Simultaneous sampling ADC capturing synchronized waveforms from six differential sensor outputs (e.g., shunt-based current + bus voltage). Use Value: Enables precise calculation of active/reactive power, THD, and imbalance without inter-channel timing error-induced calculation drift. |
Use Scenario: Closed-loop field-oriented control (FOC) of BLDC or induction motors using rotor position feedback and phase current sensing. IC Role / Device Role / Timing Role: Six-channel simultaneous acquisition of motor phase currents and DC-link voltage for torque/current regulation at >10kHz loop rates. Use Value: Eliminates phase misalignment between current samples, preventing torque ripple and improving efficiency in high-dynamic-response drives. |
| Data Acquisition Systems | Uninterruptible Power Supplies |
Use Scenario: Modular industrial DAQ modules requiring high channel density, low power, and wide temperature operation for vibration or thermal monitoring. IC Role / Device Role / Timing Role: Precision front-end ADC with integrated reference and serial interface - reduces BOM count and layout complexity in compact form factors. Use Value: Delivers 14-bit resolution and 76dB SINAD in a 5mm × 5mm QFN, enabling 16-channel systems with <100mW total analog section power. |
Use Scenario: Online UPS systems performing continuous mains voltage/frequency monitoring, battery voltage/current tracking, and inverter output conditioning. IC Role / Device Role / Timing Role: Simultaneous capture of input AC, battery DC, and output AC waveforms to detect grid anomalies and coordinate switchover timing. Use Value: Ensures zero-phase-error correlation between input and output measurements, critical for seamless transfer and harmonic distortion detection. |
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, 1MSPS, SPI interface, internal reference, but only two simultaneous-sampling channels (not six) | Requires external multiplexing or multiple ICs to match six-channel simultaneity; higher resolution trades off against channel count and power (25mW active) | Select when 16-bit resolution outweighs need for native six-channel sync; verify timing alignment across multiple devices if scaling to six channels. |
| AD7656ASTZ | 16-bit, 250kSPS, six-channel simultaneous sampling, parallel/serial interface, but requires ±5V/±15V supplies and larger 64-lead LQFP package | Higher power (120mW), wider supply range, and larger footprint limit use in space-constrained or battery-operated systems | Prefer for legacy industrial systems already using ±15V rails and needing higher resolution; avoid where 3V-only operation or QFN thermal performance is mandatory. |
Compared with ADS8686SIPWR and AD7656ASTZ, the LTC1408IUH#PBF uniquely balances six-channel simultaneity, 3V single-supply operation, ultra-low sleep power (6µW), and compact QFN packaging - making it optimal for portable, thermally constrained, or cost-sensitive multiphase measurement where 14-bit resolution suffices.
Availability
LTC1408IUH#PBF is available at Aetrix Electronics and suitable for multiphase power measurement, motor control systems, and industrial data acquisition requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1408IUH#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision instrumentation and industrial applications.
The LTC1408IUH#PBF belongs to Linear's precision data acquisition product line, engineered specifically for applications demanding simultaneous multi-channel sampling, low power, and robust noise immunity in harsh electrical environments.
FAQ
What is the operating temperature range for the LTC1408IUH#PBF?
The LTC1408IUH#PBF is rated for industrial operation from –40°C to +85°C (I-grade). This range is validated across all key specifications including offset error, gain error, SINAD, and CMRR - ensuring reliable performance in motor drives, UPS units, and outdoor power electronics where ambient temperatures fluctuate widely. The device uses internal thermal compensation to maintain reference stability within 15ppm/°C over this full range.
How does the BIP pin affect output data format in the LTC1408IUH#PBF?
When BIP = LOW, the LTC1408IUH#PBF operates in unipolar mode with 0V–2.5V differential input range and outputs straight binary data (0x0000 to 0x3FFF). When BIP = HIGH, it switches to bipolar mode (±1.25V input) and outputs 2's complement format (0xC000 to 0x3FFF), where 0x0000 represents –1.25V and 0x2000 is mid-scale (0V). The LTC1408IUH#PBF requires full acquisition time after changing BIP state before valid conversion results are guaranteed.
Can the LTC1408IUH#PBF perform conversions on fewer than six channels?
Yes - the LTC1408IUH#PBF supports partial-channel conversion via SEL2/SEL1/SEL0 pins. Setting SEL2:SEL1:SEL0 to 000 converts only CH0; 001 adds CH1; up to 101/110/111 for all six. Each enabled channel consumes 16 SCK cycles, so converting four channels takes 64 clocks instead of 96. The LTC1408IUH#PBF maintains simultaneous sampling across all six inputs regardless of how many are converted, preserving timing integrity for future expansion.
What is the minimum acquisition time required for full throughput in the LTC1408IUH#PBF?
The LTC1408IUH#PBF specifies 39ns typical sample-and-hold acquisition time (tACQ) at full 600ksps aggregate rate. This value assumes low source impedance (<100Ω) and proper bypassing (10µF + 0.1µF) on VCC/VDD. With higher source impedance, acquisition time increases linearly - requiring buffer amplifiers for >1kΩ sources. The LTC1408IUH#PBF's tACQ is guaranteed over the full –40°C to +85°C range and directly impacts maximum achievable throughput without missing codes.
Does the LTC1408IUH#PBF require an external reference voltage?
No - the LTC1408IUH#PBF integrates a 2.5V bandgap reference with 15ppm/°C tempco and 2ms wake-up settling time. It can be overdriven by an external reference (2.55V to VDD) for improved accuracy or tighter tolerance, but the internal reference is fully functional and calibrated for 14-bit performance. Using the internal reference eliminates one external component and simplifies layout, especially in space-constrained applications where the LTC1408IUH#PBF's QFN package is advantageous.
LTC1408IUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC1408IUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1408IUH#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 LTC1408IUH#PBF reliable?
The price and inventory of LTC1408IUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1408IUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC1408IUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1408IUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1408IUH#PBF?
LTC1408IUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1408IUH#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 LTC1408IUH#PBF?
For technical support, including LTC1408IUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1408IUH#PBF requirements.
6.How does Aetrix verify that LTC1408IUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1408IUH#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 LTC1408IUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC1408IUH#PBF?
All LTC1408IUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1408IUH#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 LTC1408IUH#PBF part is unused and in its original packaging.
Return procedure for LTC1408IUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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