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Analog Devices Inc. LTC2345HUK-16#PBF
- Part No.:
- LTC2345HUK-16#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC2345HUK-16#PBF.pdf
- Description:
- IC ADC 16BIT SAR 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,072
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Product details
Overview
LTC2345HUK-16#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 8-channel simultaneous-sampling SAR ADC with differential SoftSpan™ inputs, 200ksps per channel throughput, ±1.25LSB INL, 91dB SNR, and guaranteed no missing codes at 16 bits. It operates over –40°C to +125°C and integrates a 4.096V reference buffer for direct signal digitization in industrial process control and high-speed data acquisition.
For engineers reviewing the LTC2345HUK-16#PBF datasheet, LTC2345HUK-16#PBF pinout, LTC2345HUK-16#PBF application, or LTC2345HUK-16#PBF equivalent, key selection criteria include per-channel SoftSpan range configuration (±4.096V/0–4.096V/±2.048V/0–2.048V), 102dB CMRR at 200Hz, rail-to-rail input overdrive tolerance, SPI CMOS/LVDS interface flexibility, and H-grade extended temperature operation.
Technical Context
The LTC2345HUK-16#PBF implements an 8-channel simultaneous sampling architecture using independent sample-and-hold circuits per channel, enabling true time-aligned conversion across all inputs without inter-channel skew. Its SoftSpan™ digital configuration allows per-conversion selection of four differential input ranges via SPI register writes.
It features dual serial interface modes: pin-selectable CMOS (1.8V–5V OVDD) supporting 1–8 data lanes, and LVDS mode with differential clock/data pairs. Internal conversion timing is fully self-contained with no cycle latency, and the integrated 4.096V reference buffer supports both internal bandgap and external overdrive configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees full 65,536-code dynamic range with no missing codes across temperature. |
| Sampling Rate | 200ksps per channel (8-channel mode) - enables real-time capture of signals up to ~31MHz bandwidth (–3dB). |
| INL | ±1.25LSB max - ensures accurate end-point linearity critical for closed-loop control and calibration-sensitive systems. |
| SNR | 91dB typical (±4.096V range, fIN = 2kHz) - delivers >15 effective bits for precision measurement applications. |
| CMRR | 102dB typical at 200Hz - rejects common-mode noise from motor drives, power supplies, and long sensor cables. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, downhole oil & gas, and industrial edge computing environments. |
| Power Dissipation | 81mW typical (CMOS mode, 8 channels) - enables dense multi-channel DAQ designs without forced cooling. |
Pinout & Package
48-lead (7mm × 7mm) QFN package with exposed thermal pad (Pin 49 = GND). All GND pins (15, 16, 17, 18, 20, 30, 41, 44, 45, 46, 49) must be soldered to a solid ground plane for optimal noise performance and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN0+ to IN7+, IN0− to IN7− (Pins 1–14, 47–48) | Differential analog inputs (8 channels) | Simultaneously sampled; support wide common-mode range (0V to VDD) and ±4.096V differential swing. |
| REFIN (Pin 19) | Bandgap reference output / external reference input | Nominally outputs 2.048V; accepts 1.25V–2.2V external reference to set VREFBUF = 2×REFIN. |
| REFBUF (Pin 21) | Internal reference buffer output | Provides 4.096V master reference (2×REFIN); requires 47μF bypass to GND for stability. |
| CNV (Pin 23) | Conversion start trigger | Rising edge initiates simultaneous sampling; minimum pulse width 40ns. |
| BUSY (Pin 26) | Conversion status indicator | Active-high during conversion; enables precise timing of data readback after tCONV. |
| SDO0–SDO7 (Pins 27–34) | Serial data outputs (CMOS mode) | Configurable 1–8 lane parallel output; each lane carries one channel's 16-bit result MSB-first. |
| SCKO+/SCKO−, SCKI+/SCKI− (Pins 35–38) | Differential clock I/O (LVDS mode) | Supports high-speed, noise-immune serial interface with <1ps skew between lanes. |
| PD (Pin 22) | Power-down control | Active-high enters low-power state (≤0.33mW); wake-up time 200ms due to REFBUF stabilization. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel SoftSpan™ range selection | Four programmable differential input ranges (±4.096V, 0–4.096V, ±2.048V, 0–2.048V) configurable per conversion - eliminates external gain-switching circuitry. |
| 102dB CMRR at 200Hz | Enables direct connection to noisy industrial transducers (e.g., strain gauges, RTDs) without front-end filtering or guarding. |
| Rail-to-rail input overdrive tolerance | Withstands ±VDD differential overvoltage on any channel without corrupting other channel conversions - improves system robustness. |
| Integrated 4.096V reference buffer | Eliminates need for external reference IC and buffer op amp; reduces BOM count and layout area while maintaining 5ppm/°C tempco. |
| Pin-selectable CMOS/LVDS interface | CMOS mode supports 1.8V–5V OVDD and scalable bus width; LVDS mode provides EMI-resistant 100+ Mbps serial throughput. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
|
Use Scenario: High-density analog input modules acquiring voltage/current signals from multiple field sensors (4–20mA loops, thermocouples) in real time. IC Role / Device Role / Timing Role: Simultaneous 8-channel sampling ensures phase-coherent capture across distributed I/O points for synchronized control algorithms. Use Value: ±1.25LSB INL and 91dB SNR enable sub-0.01% measurement accuracy required for closed-loop PID tuning and safety-critical monitoring. |
Use Scenario: Distributed control systems monitoring pressure, flow, and temperature in chemical reactors or power plant subsystems. IC Role / Device Role / Timing Role: Differential SoftSpan inputs directly interface with isolated sensor front-ends; 102dB CMRR rejects EMI from variable-frequency drives. Use Value: –40°C to +125°C operation ensures reliability in unconditioned cabinet environments; integrated reference reduces calibration drift over time. |
| Medical Imaging Signal Chain | High-Speed Data Acquisition |
|
Use Scenario: Ultrasound beamformer front-end digitizing echo return signals from phased-array transducers. IC Role / Device Role / Timing Role: Simultaneous sampling across 8 channels preserves time-of-flight coherence between adjacent elements for accurate beam steering. Use Value: 200ksps/channel throughput supports >10cm depth imaging at 1.54mm/µs speed of sound; 31MHz –3dB bandwidth captures harmonics for tissue characterization. |
Use Scenario: Portable oscilloscope or spectrum analyzer capturing transient events in power electronics, motor drives, or RF systems. IC Role / Device Role / Timing Role: Dual CMOS/LVDS interface allows flexible trade-off between board space (CMOS) and noise immunity (LVDS) in compact enclosures. Use Value: 81mW power dissipation enables battery-powered operation; rail-to-rail overdrive tolerance prevents latch-up during voltage spikes in switching converter measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606C-16 (Analog Devices) | 16-bit, 8-channel, 1MSPS, internal reference, but only ±10V/±5V/0–10V fixed ranges; no per-channel SoftSpan flexibility. | Higher throughput but less input signal adaptability; lacks 102dB CMRR and rail-to-rail overdrive tolerance. | Choose AD7606C-16 when maximum sample rate is primary; choose LTC2345HUK-16#PBF when signal range agility and noise immunity are critical. |
| ADS8688 (Texas Instruments) | 16-bit, 8-channel, 500kSPS, integrated PGA, but single-ended inputs only; requires external reference and driver amplifiers. | No differential input capability or CMRR spec; higher system-level component count and layout complexity. | Choose ADS8688 when programmable gain is needed; choose LTC2345HUK-16#PBF when differential sensing, low noise, and minimal external components are required. |
Compared with AD7606C-16 and ADS8688, the LTC2345HUK-16#PBF uniquely combines per-channel SoftSpan range selection, 102dB CMRR, and integrated 4.096V reference buffer-enabling simpler, more robust signal chains in harsh industrial and medical environments where input signal variability and EMI resilience are paramount.
Availability
LTC2345HUK-16#PBF is available at Aetrix Electronics and suitable for industrial process control, programmable logic controllers, and high-speed data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2345HUK-16#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2345 family was designed specifically for high-accuracy, multi-channel data acquisition in thermally demanding environments-emphasizing simultaneous sampling integrity, input flexibility, and integrated reference stability without external support components.
FAQ
What is the maximum operating temperature of the LTC2345HUK-16#PBF?
The LTC2345HUK-16#PBF is rated for continuous operation from –40°C to +125°C ambient temperature, making it suitable for under-hood automotive, downhole instrumentation, and industrial edge computing applications where thermal management is constrained. This H-grade qualification is confirmed in the Absolute Maximum Ratings table and applies across all electrical specifications unless otherwise noted.
Does the LTC2345HUK-16#PBF require an external reference?
No, the LTC2345HUK-16#PBF includes an integrated 2.048V bandgap reference and a 4.096V reference buffer (REFBUF pin), eliminating the need for external reference ICs in most applications. An external reference can be applied to REFIN (1.25V–2.2V) to override the internal bandgap and set a custom VREFBUF = 2×REFIN, but it is not required for standard operation.
How does the SoftSpan™ feature work on the LTC2345HUK-16#PBF?
The SoftSpan™ feature on the LTC2345HUK-16#PBF allows each of the eight analog input channels to be independently configured-on a per-conversion basis-into one of four differential input ranges: ±4.096V, 0–4.096V, ±2.048V, or 0–2.048V. Configuration is performed via SPI register writes, enabling dynamic adaptation to varying sensor output levels without hardware changes or external gain switching.
What is the significance of the 102dB CMRR specification for the LTC2345HUK-16#PBF?
The 102dB CMRR (common-mode rejection ratio) at 200Hz means the LTC2345HUK-16#PBF attenuates common-mode interference-such as ground loop noise or EMI from nearby motors or switching power supplies-by a factor of >100,000×. This enables reliable digitization of low-level differential signals (e.g., from bridge sensors) in electrically noisy industrial settings without additional filtering or guarding.
Can the LTC2345HUK-16#PBF operate with a 3.3V OVDD supply in CMOS mode?
Yes, the LTC2345HUK-16#PBF supports CMOS digital I/O with OVDD from 1.71V to 5.25V, including 3.3V. At OVDD = 3.3V, VIH = 2.64V min and VIL = 0.66V max ensure compatibility with standard 3.3V logic families. The device maintains full 200ksps/channel performance and all specified AC/DC parameters across this OVDD range.
LTC2345HUK-16#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- SoftSpan™
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 8
- Input Type:
- Differential
- Data Interface:
- LVDS - Serial, SPI
- Configuration:
- S/H-MUX-ADC
- Ratio - S/H:ADC:
- 8:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 48-QFN (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2345HUK-16#PBF FAQ
1.How can I place an order for LTC2345HUK-16#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2345HUK-16#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 LTC2345HUK-16#PBF reliable?
The price and inventory of LTC2345HUK-16#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2345HUK-16#PBF is usually 5 days.
3.What payment methods are accepted for LTC2345HUK-16#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2345HUK-16#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2345HUK-16#PBF?
LTC2345HUK-16#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2345HUK-16#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 LTC2345HUK-16#PBF?
For technical support, including LTC2345HUK-16#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2345HUK-16#PBF requirements.
6.How does Aetrix verify that LTC2345HUK-16#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2345HUK-16#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 LTC2345HUK-16#PBF meets industry standards.
7.What is the process for return or replacement of LTC2345HUK-16#PBF?
All LTC2345HUK-16#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2345HUK-16#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 LTC2345HUK-16#PBF part is unused and in its original packaging.
Return procedure for LTC2345HUK-16#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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