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Analog Devices Inc. LTC1408CUH-12#TRPBF
- Part No.:
- LTC1408CUH-12#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC1408CUH-12#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,847
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Product details
Overview
LTC1408CUH-12 from Analog Devices (formerly Linear Technology) is a 12-bit, 600ksps simultaneous-sampling analog-to-digital converter with six differential input channels, 72dB SINAD, 83dB CMRR, and 3V single-supply operation in a 32-pin 5mm × 5mm QFN package. It supports unipolar (0V–2.5V) or bipolar (±1.25V) differential input ranges and is used in multiphase power measurement and motor control systems requiring precise phase-aligned acquisition.
For engineers reviewing the LTC1408CUH-12 datasheet, LTC1408CUH-12 pinout, LTC1408CUH-12 application, or LTC1408CUH-12 equivalent, key selection considerations include simultaneous sampling capability, 100ksps per-channel throughput, SLEEP mode (6µW), internal 2.5V reference with external overdrive support, and SPI-compatible 3-wire serial interface timing compliance.
Technical Context
The LTC1408CUH-12 employs six independent sample-and-hold circuits triggered synchronously on the rising edge of the CONV signal, enabling true simultaneous sampling across all six differential pairs. Conversion proceeds at 100ksps per channel, with total throughput scaling inversely with enabled channel count (e.g., 200ksps/ch for 3 channels).
Its architecture integrates a 12-bit successive approximation register (SAR) ADC core, internal 2.5V bandgap reference (±15ppm/°C tempco), and programmable channel selection via SEL2–SEL0. The device supports two low-power states-NAP (3.3mW) and SLEEP (6µW)-with wake-up via SCK or CONV pulses, and features rail-to-rail analog input tolerance within common-mode limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes; guarantees monotonic transfer function and full-scale linearity for precision measurement. |
| Sampling Rate | 600ksps aggregate, 100ksps per channel; enables synchronized capture of fast transient events across multiple phases. |
| SINAD | 72dB typical at 100kHz; ensures ≥11.6 effective bits for high-fidelity signal reconstruction in AC-coupled applications. |
| CMRR | 83dB at 100kHz; suppresses ground-loop noise and common-mode interference in noisy industrial environments. |
| Power Dissipation | 15mW active, 3.3mW NAP, 6µW SLEEP; supports battery-powered portable instrumentation and energy-conscious designs. |
| Input Range | 0V–2.5V unipolar or ±1.25V bipolar differential; selectable via BIP pin; accommodates both sensor and legacy signal conditioning topologies. |
| Reference | Internal 2.5V bandgap (±15ppm/°C); overdrivable with external 2.55V–VDD reference for improved accuracy or system-level calibration. |
Pinout & Package
Package: 32-pin plastic 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+ / CH0– to CH5+ / CH5– (Pins 4–5, 7–8, 10–11, 14–15, 17–18, 20–21) | Differential analog inputs | Six fully independent, simultaneously sampled differential pairs; each accepts rail-to-rail common-mode voltage (0V–VDD) with ±1.25V or 0V–2.5V differential swing. |
| CONV (Pin 30) | Conversion start trigger | Rising-edge–sensitive control input that latches all six inputs and initiates conversion sequence; also controls NAP/SLEEP entry via pulse count. |
| SCK (Pin 32) | Serial clock input | Drives data output timing; 96 SCLK cycles required for full 6-channel readout; minimum 100ns period ensures analog performance. |
| SDO (Pin 1) | Three-state serial data output | MSB-first, 12-bit words for CH0–CH5 output sequentially; tri-states when not actively transmitting to prevent bus contention. |
| BIP (Pin 29) | Bipolar/unipolar mode select | Static logic input defining input range and output coding format (2's complement for bipolar, straight binary for unipolar). |
| SEL2/SEL1/SEL0 (Pins 26–28) | Channel enable control | 3-bit code selects 1–6 active channels per conversion cycle; determines total SCLK count (16×N) and throughput rate scaling. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling | Six independent S&H circuits acquire all inputs at identical instant (≤200ps channel-to-channel skew), eliminating phase error in multi-sensor systems. |
| Low-power shutdown modes | SLEEP mode draws only 2.0–15µA; NAP mode consumes 1.1–1.9mA; both retain configuration and resume conversion without reinitialization. |
| High common-mode rejection | 83dB CMRR at 100kHz enables accurate differential measurements in presence of strong EMI or ground potential differences. |
| Flexible reference architecture | Internal 2.5V reference usable standalone or overdriven by external source; supports system-level calibration and ratiometric sensing. |
| Configurable channel count | SEL2–SEL0 pins allow dynamic reduction of active channels (1–6), increasing per-channel throughput up to 600ksps for single-channel use. |
Applications
| Multiphase Power Measurement | Multiphase Motor Control |
|---|---|
|
Use Scenario: Real-time monitoring of voltage and current waveforms across three-phase AC power lines for energy metering and fault detection. IC Role / Device Role / Timing Role: Simultaneously samples all phase voltages and currents with sub-200ps inter-channel skew to preserve phase relationships for RMS, THD, and power factor calculation. Use Value: Enables accurate synchronous capture of fast transients (e.g., inrush, switching spikes) without interpolation or phase correction algorithms. |
Use Scenario: Closed-loop field-oriented control (FOC) of 3-phase BLDC or PMSM motors using back-EMF and current feedback. IC Role / Device Role / Timing Role: Captures motor phase currents and bus voltage at precisely aligned instants to compute torque vector components and commutation angles. Use Value: Eliminates timing-induced torque ripple and improves efficiency by ensuring current sampling occurs at consistent electrical angles. |
| Data Acquisition Systems | Uninterruptible Power Supplies |
|
Use Scenario: Modular industrial DAQ modules acquiring sensor data from vibration, temperature, and pressure transducers in harsh environments. IC Role / Device Role / Timing Role: Provides six isolated differential input channels with 83dB CMRR to reject ground noise from mixed-signal sensor front-ends. Use Value: Reduces need for external isolation amplifiers or complex filtering, lowering BOM cost and board area while maintaining 12-bit fidelity. |
Use Scenario: Input/output voltage and current monitoring in online UPS systems during mains failure and inverter switchover events. IC Role / Device Role / Timing Role: Samples AC input, DC bus, and inverter output simultaneously to detect zero-crossings, waveform distortion, and load transients. Use Value: Supports seamless transfer and harmonic analysis during transition by preserving time alignment between critical power rails. |
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 (Texas Instruments) | 16-bit resolution, 100ksps per channel, 8-channel, SPI interface, 3.3V supply; higher resolution but lower sample rate and larger 48-pin VQFN package. | Better suited for high-accuracy static measurements (e.g., precision test equipment); less optimal for high-speed transient capture due to lower aggregate throughput. | Select when >12-bit ENOB is required and per-channel speed ≤100ksps suffices; verify layout compatibility with larger footprint and different pinout. |
| AD7656ASTZ (Analog Devices) | 16-bit resolution, 250ksps aggregate, 6-channel, parallel/serial interface, ±5V/±15V dual supply; higher power (120mW), no integrated reference, requires external REF. | Targeted at industrial PLCs and legacy systems using ±10V signaling; lacks low-power sleep modes and 3V-only operation. | Choose for compatibility with existing ±15V analog signal chains or where external reference control is mandatory; avoid if 3V-only design or ultra-low standby power is required. |
Compared with ADS8588SIRTVR and AD7656ASTZ, the LTC1408CUH-12 delivers optimal balance of 12-bit precision, 600ksps aggregate throughput, 3V single-supply operation, and 6µW SLEEP mode-making it uniquely suitable for portable, battery-aware, and space-constrained multiphase measurement systems.
Availability
LTC1408CUH-12 is available at Aetrix Electronics and suitable for multiphase power measurement, motor control, and uninterruptible power supply applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1408CUH-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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1408CUH-12 belongs to ADI's precision data acquisition product line, designed specifically for applications demanding synchronized multi-channel sampling, low power, and robust noise immunity in electrically noisy environments.
FAQ
What is the operating temperature range for the LTC1408CUH-12?
The LTC1408CUH-12 is rated for commercial temperature operation from 0°C to 70°C. This is confirmed by the "C" grade designation in the part number and specified in the Absolute Maximum Ratings table. For extended industrial range (–40°C to 85°C), the LTC1408IUH-12 variant is available. Thermal derating applies above 70°C ambient.
How does the LTC1408CUH-12 achieve simultaneous sampling across six channels?
The LTC1408CUH-12 uses six independent sample-and-hold (S&H) circuits, each associated with one differential input pair. All six S&H units are triggered identically on the rising edge of the CONV signal, capturing analog inputs at the same instant. Channel-to-channel aperture skew is guaranteed ≤200ps, ensuring true simultaneity for phase-critical measurements.
Can the LTC1408CUH-12 operate without an external reference?
Yes, the LTC1408CUH-12 includes an internal 2.5V bandgap reference with ±15ppm/°C tempco and 2ms settling time after wake-up. It can be used directly for uncalibrated applications. An external reference (2.55V to VDD) may overdrive VREF for improved accuracy, stability, or system-level ratiometric operation.
What are the power consumption values for LTC1408CUH-12 in active, NAP, and SLEEP modes?
In active mode at 600ksps, the LTC1408CUH-12 draws 5–7mA (15mW). In NAP mode, supply current drops to 1.1–1.9mA (3.3mW). In SLEEP mode, it consumes only 2.0–15µA (6µW). These values are measured at VDD = VCC = OVDD = 3V and TA = 25°C, with full specifications validated over the 0°C–70°C range.
Does the LTC1408CUH-12 support partial-channel conversion, and how is it configured?
Yes, the LTC1408CUH-12 supports partial-channel conversion via SEL2, SEL1, and SEL0 pins. A 3-bit code (e.g., 000 for CH0 only, 011 for CH0–CH3) selects 1–6 active channels. Each enabled channel requires 16 SCLK cycles, reducing total conversion time and increasing per-channel throughput-e.g., 200ksps for 3 channels.
LTC1408CUH-12#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:
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 32-QFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1408CUH-12#TRPBF FAQ
1.How can I place an order for LTC1408CUH-12#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1408CUH-12#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 LTC1408CUH-12#TRPBF reliable?
The price and inventory of LTC1408CUH-12#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1408CUH-12#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1408CUH-12#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1408CUH-12#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1408CUH-12#TRPBF?
LTC1408CUH-12#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1408CUH-12#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 LTC1408CUH-12#TRPBF?
For technical support, including LTC1408CUH-12#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1408CUH-12#TRPBF requirements.
6.How does Aetrix verify that LTC1408CUH-12#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1408CUH-12#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 LTC1408CUH-12#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1408CUH-12#TRPBF?
All LTC1408CUH-12#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1408CUH-12#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 LTC1408CUH-12#TRPBF part is unused and in its original packaging.
Return procedure for LTC1408CUH-12#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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