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Analog Devices Inc. LTC1408IUH-12#PBF
- Part No.:
- LTC1408IUH-12#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC1408IUH-12#PBF.pdf
- Description:
- IC ADC 12BIT SAR 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:529
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Product details
Overview
LTC1408IUH-12 from Analog Devices (formerly Linear Technology) is a 12-bit, 6-channel simultaneous-sampling analog-to-digital converter with 600ksps aggregate throughput and 100ksps per channel. It operates from a single 3V supply, draws only 5mA active current, and features 83dB common-mode rejection for noise-immune differential sensing in multiphase power and motor control systems.
For engineers reviewing the LTC1408IUH-12 datasheet, LTC1408IUH-12 pinout, LTC1408IUH-12 application, or LTC1408IUH-12 equivalent, key selection criteria include simultaneous sampling integrity, rail-to-rail differential input support (0–2.5V unipolar or ±1.25V bipolar), 72dB SINAD at 100kHz, SLEEP mode (6µW), and QFN-32 (5mm × 5mm) package compatibility with high-density portable designs.
Technical Context
The LTC1408IUH-12 integrates six independent sample-and-hold circuits triggered synchronously on the rising edge of the CONV signal, enabling true simultaneous acquisition across all channels. Its internal 2.5V bandgap reference supports overdrive with external references up to VDD, and BIP pin selection configures output data format (straight binary or 2's complement) and input range polarity.
Conversion sequencing is controlled by SEL2/SEL1/SEL0, allowing dynamic selection of 1–6 channels per conversion cycle (96 SCLK max). The 3-wire SPI-compatible serial interface outputs 12-bit words MSB-first in 96 clock cycles, with SDO tri-state capability and OVDD-supplied level-shifting for mixed-voltage system interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonicity and full-scale linearity for precision measurement. |
| Sampling Rate | 600ksps aggregate / 100ksps per channel - enables real-time capture of fast transients across all six channels simultaneously. |
| Common-Mode Rejection | 83dB at 100kHz - suppresses ground-loop noise and enables accurate differential measurements in electrically noisy environments. |
| Power Consumption | 15mW active, 3.3mW NAP, 6µW SLEEP - supports battery-powered portables and energy-sensitive industrial monitoring. |
| Input Range | 0V–2.5V unipolar or ±1.25V bipolar differential - configurable via BIP pin; absolute input voltage range 0V to VDD ensures rail-to-rail signal handling. |
| SINAD | 72dB typical at 100kHz - defines usable dynamic range for AC-coupled sensor signals and motor phase current waveforms. |
| Aperture Skew | 200ps channel-to-channel - preserves phase coherence critical for vector-controlled motor drives and power quality analysis. |
Pinout & Package
Package: 32-pin QFN (5mm × 5mm), exposed thermal 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 terminals; each pair sampled simultaneously; support rail-to-rail common-mode (0V–VDD) and ±1.25V/0–2.5V differential swing. |
| CH0– to CH5– | Inverting analog inputs (6 pairs) | Complement terminals for differential operation; matched offset and range error (<±0.5 LSB) ensure inter-channel accuracy. |
| CONV (Pin 30) | Conversion trigger | Rising-edge–synchronized start of simultaneous sampling; also controls NAP/SLEEP entry via pulse count with static SCK. |
| SCK (Pin 32) | Serial clock input | Drives conversion timing and data output; 16 clocks per enabled channel (max 96); wake-up signal from low-power modes. |
| SDO (Pin 1) | Three-state serial data output | MSB-first 12-bit words for CH0–CH5; tri-state controlled by OVDD; supports level-shifting to logic families below VDD. |
| BIP (Pin 29) | Bipolar/unipolar mode select | Static configuration pin; determines input range and output coding format (2's complement vs. straight binary). |
| SEL2/SEL1/SEL0 (Pins 26–28) | Channel count selector | 3-bit code selects 1–6 channels per conversion cycle; enables throughput scaling (e.g., 3 channels @ 200ksps/ch). |
| VREF (Pin 23) | Reference voltage terminal | 2.5V internal reference output; bypassed with 10µF + 0.1µF; accepts external reference 2.55V–VDD for improved accuracy or temperature stability. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling | Six independent S&H circuits triggered by single CONV edge - eliminates phase skew between channels for vector math and power calculations. |
| Differential input architecture | 83dB CMRR at 100kHz - rejects common-mode noise from switching power supplies and motor drives without external instrumentation amps. |
| Configurable throughput | SEL2/SEL1/SEL0 dynamically scales channel count (1–6) and per-channel rate (100–600ksps aggregate) - optimizes processing load and power in embedded firmware. |
| Low-power shutdown modes | 6µW SLEEP and 3.3mW NAP - extends battery life in portable DAQ while retaining state for rapid wake-up and restart. |
| Flexible reference interface | Internal 2.5V reference with ±15ppm/°C tempco, overdrivable with external reference - balances cost, accuracy, and thermal stability across operating temperatures. |
Applications
| Multiphase Power Measurement | Multiphase Motor Control |
|---|---|
Use Scenario: Real-time monitoring of voltage and current in 3-phase inverters or UPS systems with harmonic distortion analysis. IC Role / Device Role / Timing Role: Simultaneous sampling of all phase voltages and currents ensures coherent phasor calculation and power factor correction. Use Value: 200ps aperture skew preserves phase alignment across channels, enabling accurate RMS, THD, and reactive power computation per IEC 61000-4-30. | Use Scenario: Closed-loop field-oriented control (FOC) of BLDC or PMSM motors using back-EMF and phase current feedback. IC Role / Device Role / Timing Role: Six-channel synchronized acquisition captures instantaneous stator currents and bus voltage for torque and flux estimation. Use Value: 100ksps per channel supports >10kHz PWM carrier frequencies while maintaining sufficient oversampling for current reconstruction. |
| Data Acquisition Systems | Uninterruptible Power Supplies |
Use Scenario: Portable vibration analysis or condition monitoring of industrial machinery with multi-sensor analog inputs. IC Role / Device Role / Timing Role: High-resolution (12-bit), low-noise (72dB SINAD) digitization of accelerometer, temperature, and pressure signals. Use Value: Single-supply 3V operation and 5mA active current enable compact, battery-operated form factors without performance compromise. | Use Scenario: Input/output voltage and current supervision in online double-conversion UPS with seamless transfer detection. IC Role / Device Role / Timing Role: Simultaneous capture of AC input, DC bus, and AC output waveforms for transfer timing, waveform fidelity, and overload detection. Use Value: Bipolar/unipolar mode flexibility allows direct connection to isolated current shunts (±1.25V) and voltage dividers (0–2.5V) without external level-shifting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8588SIRTVR | 8-channel, 16-bit, 100ksps/ch, SPI interface, 5V supply, 10.5mW active power | Higher resolution and channel count but lower sampling speed per channel and higher supply voltage requirement | Preferred when 16-bit precision and 8-channel density outweigh 3V operation and ultra-low sleep power needs |
| AD7606C-18 | 8-channel, 18-bit, 1MSPS aggregate, parallel/SPI interface, ±5V/±15V analog supply options | Higher resolution, faster aggregate rate, dual-supply flexibility, but larger LQFP-64 package and no sub-mW sleep mode | Selected for high-accuracy test equipment where 18-bit linearity and wide input range justify increased size and power |
Compared with ADS8588SIRTVR and AD7606C-18, the LTC1408IUH-12 delivers optimal trade-off of 12-bit precision, true simultaneity, 3V single-supply simplicity, and µW-level shutdown - making it uniquely suited for space-constrained, battery-aware industrial and portable measurement systems.
Availability
LTC1408IUH-12 is available at Aetrix Electronics and suitable for multiphase motor control, uninterruptible power supplies, and portable data acquisition systems requiring stable component supply across extended industrial temperature ranges (–40°C to +85°C).
Supply support for LTC1408IUH-12 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-12 belongs to ADI's legacy Linear Technology precision data acquisition portfolio, engineered specifically for applications demanding synchronized multi-channel sampling, low power, and robust noise immunity in harsh electrical environments.
FAQ
What is the operating temperature range for the LTC1408IUH-12?
The LTC1408IUH-12 is rated for industrial operation from –40°C to +85°C. This is confirmed by its "I" grade designation in the part number and specified in the Absolute Maximum Ratings table. The device maintains full performance-including 12-bit linearity, 72dB SINAD, and 83dB CMRR-across this entire range when powered from 2.7V–3.6V supplies and properly decoupled.
How does the LTC1408IUH-12 achieve simultaneous sampling across six channels?
The LTC1408IUH-12 achieves true simultaneous sampling using six independent sample-and-hold (S&H) circuits, each dedicated to one differential input pair (CH0–CH5). All six S&H units are triggered by the same rising edge of the CONV signal, capturing analog values at precisely the same instant. This architecture eliminates time skew between channels, ensuring phase-coherent acquisition essential for power and motor control algorithms.
Can the LTC1408IUH-12 use an external reference, and what are the voltage limits?
Yes, the LTC1408IUH-12 supports external reference input at the VREF pin (Pin 23). The valid external reference range is 2.55V to VDD (up to 3.6V). When an external reference is applied, the internal 2.5V bandgap is overridden. This allows improved accuracy, lower tempco (±1ppm/°C vs. ±15ppm/°C), and better long-term stability compared to the internal reference-critical for metrology-grade applications.
What is the minimum acquisition time required for full-speed operation of the LTC1408IUH-12?
The minimum sample-and-hold acquisition time for the LTC1408IUH-12 is 39ns under full-speed conditions (600ksps aggregate). This value is guaranteed over temperature and supply voltage (2.7V–3.6V) and is defined as the time needed for the internal capacitors to settle after the CONV edge. External driving circuitry must allow at least this interval before the next CONV pulse to maintain 12-bit accuracy and 72dB SINAD performance.
How does the SEL2/SEL1/SEL0 configuration affect conversion throughput in the LTC1408IUH-12?
The SEL2/SEL1/SEL0 pins configure the number of channels converted per cycle: 000 = 1 channel (CH0 only), 001 = 2 channels (CH0–CH1), up to 101/110/111 = all 6 channels. Each enabled channel requires 16 SCLK cycles, so total conversion time scales linearly (e.g., 3 channels = 48 SCLK, enabling ~200ksps per channel). This lets firmware dynamically optimize throughput versus processing overhead without hardware changes.
LTC1408IUH-12#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:
- 12
- 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-12#PBF FAQ
1.How can I place an order for LTC1408IUH-12#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1408IUH-12#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-12#PBF reliable?
The price and inventory of LTC1408IUH-12#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-12#PBF is usually 5 days.
3.What payment methods are accepted for LTC1408IUH-12#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1408IUH-12#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1408IUH-12#PBF?
LTC1408IUH-12#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1408IUH-12#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-12#PBF?
For technical support, including LTC1408IUH-12#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1408IUH-12#PBF requirements.
6.How does Aetrix verify that LTC1408IUH-12#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1408IUH-12#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-12#PBF meets industry standards.
7.What is the process for return or replacement of LTC1408IUH-12#PBF?
All LTC1408IUH-12#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1408IUH-12#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-12#PBF part is unused and in its original packaging.
Return procedure for LTC1408IUH-12#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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