My Inquiry
My Account
Analog Devices Inc. LTC2308CUF#TRPBF
- Part No.:
- LTC2308CUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC2308CUF#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,186
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC2308CUF#TRPBF from Analog Devices (formerly Linear Technology) is a low-noise, 500ksps, 8-channel, 12-bit successive approximation register (SAR) ADC with integrated 2.5V reference, 8-channel analog multiplexer, and SPI/MICROWIRE-compatible serial interface. It operates from a single 5V supply, draws 3.5mA at full rate, supports unipolar (0–4.096V) or bipolar (±2.048V) input ranges, and is packaged in a 24-pin 4mm × 4mm QFN for space-constrained data acquisition systems.
For engineers reviewing the LTC2308CUF#TRPBF datasheet, LTC2308CUF#TRPBF pinout, LTC2308CUF#TRPBF application, or LTC2308CUF#TRPBF equivalent, key selection criteria include guaranteed no missing codes, 73.3dB SINAD at 1kHz, auto-shutdown scaling (3.5mA → 200µA), internal conversion clock (1.3µs typ), and software-selectable input configuration across eight channels.
Technical Context
The LTC2308CUF#TRPBF implements a capacitive charge-redistribution SAR architecture with fully differential sample-and-hold, enabling high common-mode noise rejection. Its internal 2.5V bandgap reference is factory-trimmed (±0.3% initial accuracy) and buffered to 4.096V at REFCOMP, supporting both internal and external reference operation.
Control is executed via a 6-bit SPI-configurable DIN word that selects channel (CH0–CH7), input mode (single-ended/differential), polarity (unipolar/bipolar), and sleep state. Conversion timing is fully self-contained: 240ns acquisition + 1.3µs conversion yields guaranteed 500ksps throughput without external clock dependency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonicity and deterministic full-scale linearity in closed-loop control. |
| Sampling Rate | 500ksps maximum - supports real-time monitoring of motor currents, vibration signals, and sensor arrays up to ~250kHz Nyquist bandwidth. |
| SINAD | 73.3dB at fIN = 1kHz - delivers >12-bit effective resolution for precision instrumentation and industrial process control. |
| Supply Current | 3.5mA at 500ksps; 200µA at 1ksps - auto-shutdown enables battery life extension in portable test equipment without firmware intervention. |
| Input Range | Software-selectable: 0–4.096V (unipolar) or ±2.048V (bipolar) - eliminates external level-shifting circuitry for mixed-signal sensor interfaces. |
| Reference | Internal 2.5V ±25ppm/°C tempco, buffered to 4.096V - reduces BOM count and PCB area versus discrete reference + amplifier solutions. |
| Package | 24-pin 4mm × 4mm QFN with exposed pad - provides thermal performance (θJA = 37°C/W) and layout compactness for high-density embedded systems. |
Pinout & Package
Package: 24-lead (4mm × 4mm) plastic QFN (UF package) with exposed pad (Pin 25) soldered to ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 22,23,24,1,2,3,4,5) | Analog input channels | Configurable as eight single-ended inputs referenced to COM or four differential pairs (CH0/CH1, CH2/CH3, etc.) - enables flexible sensor interfacing without external MUX. |
| COM (Pin 6) | Common-mode reference | Ground reference for unipolar mode; midpoint (REFCOMP/2) for bipolar mode - defines input common-mode voltage and must be low-noise. |
| VREF (Pin 7) | 2.5V internal reference output | Factory-trimmed bandgap source; bypassed with 2.2µF capacitor - can be overdriven by external 2.5V reference for improved accuracy/stability. |
| REFCOMP (Pin 8) | 4.096V reference buffer output | Gained version of VREF; bypassed with 10µF + 0.1µF - sets full-scale input range and may be overdriven externally (with VREF grounded). |
| CONVST (Pin 14) | Conversion start trigger | Rising-edge initiated; must return low within 40ns after conversion start/end - controls power state and enables precise timing synchronization. |
| SDI (Pin 15) | Serial data input | Latches 6-bit configuration word (S/D, O/S, S1, S0, UNI, SLP) on first six SCK rising edges - programs channel, polarity, and sleep mode before each conversion. |
| SCK (Pin 16) | Serial clock input | Drives SPI interface up to 40MHz - decouples serial timing from conversion timing, simplifying isolation and FPGA interfacing. |
| SDO (Pin 17) | Serial data output | Shifts out 12-bit result (2's complement or straight binary) on SCK falling edges - supports daisy-chaining and multi-device readout. |
| AVDD / DVDD / OVDD (Pins 12,13,21,19) | Supply rails | Separate analog (4.75–5.25V), digital (4.75–5.25V), and output driver (2.7–5.25V) supplies - enables noise isolation and I/O voltage translation to host logic. |
| GND (Pins 9,10,11,18,20,25) | Ground terminals | Six dedicated GND pins including exposed pad - mandates solid ground plane connection to minimize PSRR degradation and EMI susceptibility. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 8-channel analog multiplexer | Reduces external component count and board area; supports per-conversion reconfiguration of input topology (single-ended/differential). |
| Internal conversion clock | Eliminates need for external timing components; guarantees 500ksps throughput with 1.3µs conversion time and 240ns acquisition window. |
| Auto-shutdown current scaling | Dynamic power reduction from 3.5mA (500ksps) to 200µA (1ksps) - extends runtime in battery-powered data loggers without software overhead. |
| Software-selectable unipolar/bipolar mode | Single-bit (UNI) control enables seamless adaptation to AC-coupled sensors (e.g., accelerometers) or DC-coupled transducers (e.g., RTDs). |
| Separate OVDD supply rail | Allows SDO output voltage to match host logic (2.7–5.25V), enabling direct interface to 3.3V or 5V microcontrollers without level shifters. |
| Guaranteed no missing codes | Ensures monotonic transfer function critical for position feedback, closed-loop servo control, and safety-critical monitoring applications. |
Applications
| Industrial Process Control | Motor Control Feedback |
|---|---|
|
Use Scenario: Monitoring temperature, pressure, and flow sensors in PLC I/O modules with 4–20mA loop integration. IC Role / Device Role / Timing Role: 8-channel simultaneous sampling front-end for analog sensor conditioning and digitization prior to FPGA or MCU processing. Use Value: Internal 2.5V reference and 73.3dB SINAD enable <12-bit effective resolution without external calibration, reducing system cost and test complexity. |
Use Scenario: Capturing phase currents and rotor position signals in three-phase BLDC motor drives. IC Role / Device Role / Timing Role: High-speed SAR ADC with 500ksps throughput and 240ns acquisition time for accurate current reconstruction at PWM switching frequencies. Use Value: Differential input capability and 70dB CMRR suppress common-mode noise from gate drivers, improving torque ripple and efficiency. |
| Battery-Powered Test Equipment | Isolated Data Acquisition |
|
Use Scenario: Portable multimeters and handheld oscilloscopes requiring extended battery life and compact form factor. IC Role / Device Role / Timing Role: Low-power 12-bit ADC with auto-shutdown (200µA at 1ksps) and integrated reference, minimizing external support components. Use Value: 3.5mA active current and 0.9mW nap mode reduce thermal load and extend Li-ion battery runtime beyond 8 hours in field instruments. |
Use Scenario: High-voltage grid monitoring where analog inputs are galvanically isolated from digital processing side. IC Role / Device Role / Timing Role: SPI-compatible ADC interfaced through digital isolators (e.g., ADuM3150), leveraging 40MHz SCK tolerance for robust isolated timing. Use Value: 4-wire SPI interface eliminates need for isolated clock distribution, simplifying design and reducing component count in Class I insulation systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, multi-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8688IPWR | 8-channel, 16-bit, 500ksps, internal 4.096V reference, SPI interface, 24-QFN; higher resolution but 2× power (7.5mA) | Targeted at higher-precision industrial DAQ where 16-bit resolution justifies added cost and power | Select when >12-bit ENOB required and system power budget allows 7.5mA active current. |
| MAX11131ETK+ | 8-channel, 12-bit, 500ksps, internal 2.048V reference, SPI interface, 20-TQFN; smaller package but no bipolar mode support | Suitable for unipolar-only sensor arrays where board space is critical and bipolar inputs unnecessary | Choose for ultra-compact designs needing only 0–2.048V input range and minimal footprint. |
Compared with ADS8688IPWR and MAX11131ETK+, the LTC2308CUF#TRPBF uniquely balances 12-bit precision, bipolar/unipolar flexibility, and sub-4mA power at 500ksps - making it optimal for cost-sensitive, battery-aware, and mixed-polarity sensor systems where 16-bit resolution is not required.
Availability
LTC2308CUF#TRPBF is available at Aetrix Electronics and suitable for industrial process control, motor control feedback, and battery-powered test equipment requiring stable component supply and long-term production continuity.
Supply support for LTC2308CUF#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2308CUF#TRPBF belongs to ADI's precision data acquisition product line, designed specifically for low-power, high-accuracy, multi-channel sensor interfacing in space- and energy-constrained embedded systems.
FAQ
What is the operating temperature range for the LTC2308CUF#TRPBF?
The LTC2308CUF#TRPBF is specified for the commercial temperature range of 0°C to 70°C. This grade is validated for use in non-automotive industrial environments, laboratory instruments, and consumer-grade data acquisition systems where ambient conditions remain within this envelope. The 'C' suffix in the part number explicitly denotes this temperature grade, distinct from the industrial-grade LTC2308IUF#TRPBF (–40°C to 85°C).
Does the LTC2308CUF#TRPBF require an external reference, or does it include one?
The LTC2308CUF#TRPBF includes a fully integrated, factory-trimmed 2.5V bandgap reference with ±25ppm/°C tempco, buffered to 4.096V at the REFCOMP pin. No external reference is required for standard operation. However, VREF and REFCOMP support overdriving with external references (e.g., LT1790A-2.5 or LT1790A-4.096) to improve accuracy, drift, or noise performance when system-level requirements exceed internal reference specifications.
How does the auto-shutdown feature of the LTC2308CUF#TRPBF reduce power consumption?
The LTC2308CUF#TRPBF auto-shutdown feature dynamically scales supply current with sample rate: it draws 3.5mA at 500ksps, drops to 180µA in nap mode, and further reduces to 200µA at 1ksps. This occurs automatically based on CONVST timing - no register writes or firmware intervention needed. The LTC2308CUF#TRPBF achieves this via internal clock gating and bias current adjustment, making it ideal for intermittent-sampling applications like portable data loggers.
Can the LTC2308CUF#TRPBF interface directly with a 3.3V microcontroller?
Yes, the LTC2308CUF#TRPBF supports direct interface with 3.3V microcontrollers via its separate OVDD supply pin (Pin 19), which accepts 2.7V to 5.25V. By tying OVDD to 3.3V and using appropriate bypassing (0.1µF ceramic), the SDO output swings between 0V and 3.3V, matching standard 3.3V logic levels. AVDD and DVDD remain at 5V for optimal analog performance and noise immunity.
What is the significance of the 'TRPBF' suffix in LTC2308CUF#TRPBF?
The 'TRPBF' suffix in LTC2308CUF#TRPBF indicates a tape-and-reel packaging format (TR) with lead-free (Pb-free) finish (PBF) and RoHS-compliant termination. The 'U' in UCF denotes the 24-lead 4mm × 4mm QFN package (UF), while 'C' specifies the 0°C to 70°C temperature grade. This ordering option is optimized for automated SMT assembly and meets environmental compliance requirements for commercial electronics manufacturing.
LTC2308CUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-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
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-QFN (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2308CUF#TRPBF FAQ
1.How can I place an order for LTC2308CUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2308CUF#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 LTC2308CUF#TRPBF reliable?
The price and inventory of LTC2308CUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2308CUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2308CUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2308CUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2308CUF#TRPBF?
LTC2308CUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2308CUF#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 LTC2308CUF#TRPBF?
For technical support, including LTC2308CUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2308CUF#TRPBF requirements.
6.How does Aetrix verify that LTC2308CUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2308CUF#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 LTC2308CUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2308CUF#TRPBF?
All LTC2308CUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2308CUF#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 LTC2308CUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC2308CUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2308CUF#TRPBF Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
