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Analog Devices Inc. LTC2337HMS-18#PBF
- Part No.:
- LTC2337HMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2337HMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,691
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Product details
Overview
LTC2337HMS-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 500ksps successive approximation register (SAR) analog-to-digital converter with fully differential true bipolar inputs, ±10.24V input range, 100dB SNR (typ), ±4LSB INL (max), and operation up to 125°C. It serves as a high-precision front-end digitizer in industrial data acquisition systems requiring wide dynamic range and low distortion.
For engineers reviewing the LTC2337HMS-18#PBF datasheet, LTC2337HMS-18#PBF pinout, LTC2337HMS-18#PBF application, or LTC2337HMS-18#PBF equivalent, key selection criteria include guaranteed 18-bit no-missing-codes performance, internal 2.048V reference with 20ppm/°C drift max, SPI-compatible daisy-chain interface, nap/sleep power management, and MSOP-16 packaging qualified for extended temperature operation.
Technical Context
The LTC2337HMS-18#PBF implements a charge-redistribution SAR architecture with a fully differential input stage that accepts ±10.24V true bipolar signals via internal resistor divider networks and 45pF sampling capacitors. Its conversion core uses a 2.048V bandgap reference buffered to 4.096V, enabling ±5 × VREFBUF full-scale range.
Timing is governed by an internal oscillator-eliminating external clock dependency-with fixed 1.5µs conversion time, 1.46µs acquisition window, and zero cycle latency. The SPI-compatible serial interface supports 1.8V–5V I/O logic levels, daisy-chain mode, and 2's complement output format with BUSY and CNV synchronization signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit-guaranteed no missing codes across full operating temperature range (–40°C to 125°C). |
| Sampling Rate | 500ksps-fixed throughput with no pipeline delay or cycle latency, enabling deterministic real-time control loops. |
| INL (Max) | ±4 LSB-ensures monotonicity and linearity critical for closed-loop feedback accuracy in precision instrumentation. |
| SNR (Typ) | 100 dB at fIN = 2 kHz-supports >16.5 effective number of bits (ENOB) for high-fidelity signal capture. |
| Input Range | ±10.24 V true bipolar-enables direct digitization of industrial sensor outputs (e.g., ±10 V transducers) without external level-shifting. |
| Reference | Internal 2.048 V ±20 ppm/°C-factory-trimmed bandgap with onboard buffer; eliminates need for external reference in most applications. |
| Power (Active) | 35 mW at 500ksps-low dissipation achieved via automatic nap mode between conversions, scaling linearly with sample rate. |
| Operating Temp | –40°C to +125°C-qualified for harsh environments including motor drives, downhole tools, and aerospace avionics. |
Pinout & Package
Package: 16-lead plastic MSOP (3 mm × 4.9 mm, 0.65 mm pitch), thermally enhanced with exposed pad (not electrically connected). Pin 1 marked by dot; top-side marking "233718".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDLBYP (1) | 2.5 V regulated supply bypass | On-chip LDO output; requires 2.2 µF ceramic capacitor to GND for stable 2.5 V rail powering internal analog circuitry. |
| VDD (2) | Main analog supply | 4.75 V–5.25 V single supply; powers ADC core and reference; bypassed with 10 µF ceramic capacitor. |
| GND (3,6,16) | Analog/digital ground | Three dedicated ground pins minimize ground bounce and improve PSRR; must be tied to common system ground plane. |
| IN+, IN– (4,5) | Differential analog inputs | Accept ±10.24 V true bipolar signal; input impedance modeled as 2 kΩ resistive divider + 45 pF capacitance per pin. |
| REFBUF (7) | Reference buffer output | 4.096 V (2× REFIN) output; decoupled with 47 µF ceramic capacitor; can be overdriven externally (2.5 V–5 V) when internal buffer disabled. |
| REFIN (8) | Reference output/input | 2.048 V bandgap reference output; bypassed with 100 nF ceramic capacitor; accepts external reference (1.25 V–2.4 V) via 15 kΩ series resistor. |
| CNV (9) | Convert trigger input | Rising-edge–sensitive; initiates acquisition and conversion; logic threshold referenced to OVDD voltage. |
| CHAIN (10) | Interface mode selector | Low = normal mode (RDL/SDI = bus enable); high = daisy-chain mode (RDL/SDI = serial data input). |
| BUSY (11) | Conversion status indicator | Active-high open-drain output; asserts at CNV rising edge and deasserts upon result availability on SDO. |
| RDL/SDI (12) | Serial interface control/data | Function depends on CHAIN state: bus enable (low) or SDI (high); supports SPI read/write and multi-device chaining. |
| SCK (13) | Serial clock input | Accepts 10 ns min pulse width (100 MHz max); controls timing of SDO data shifts; synchronous to rising edge. |
| SDO (14) | Serial data output | 2's complement 18-bit result shifted MSB-first; tri-state controlled by RDL/SDI in normal mode; active during BUSY high. |
| OVDD (15) | I/O supply voltage | 1.71 V–5.25 V digital interface supply; sets logic thresholds for all digital pins; bypassed with 0.1 µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| True bipolar ±10.24 V input | Enables direct connection to industrial ±10 V sensors and actuators without external op-amp level-shifting circuitry. |
| No missing codes at 18 bits | Guaranteed monotonic transfer function ensures accurate position sensing and control loop stability across full temperature range. |
| Internal 2.048 V reference + buffer | Eliminates external reference IC and associated layout complexity while maintaining <20 ppm/°C drift over –40°C to 125°C. |
| Daisy-chain SPI interface | Allows cascading multiple LTC2337HMS-18#PBF devices on one SPI bus-reducing MCU GPIO count and PCB routing density. |
| Automatic nap mode | Reduces average current draw proportionally to sampling rate-e.g., 3.9 mA at 500ksps drops to ~0.4 mA at 50ksps-extending battery life in portable instruments. |
| 125°C extended temperature grade | Validated operation up to junction temperature of 150°C (θJA = 110°C/W) supports deployment in engine compartments and industrial enclosures. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: Digitizing analog signals from pressure, flow, and temperature transmitters in modular PLC backplanes. IC Role / Device Role / Timing Role: High-accuracy front-end ADC capturing ±10 V sensor outputs at 500ksps for real-time PID loop execution. Use Value: 100 dB SNR and ±4 LSB INL ensure sub-0.01% measurement fidelity required for regulatory compliance in pharmaceutical and chemical plants. | Use Scenario: Monitoring and controlling distributed field devices in oil & gas refineries with ambient temperatures up to 125°C. IC Role / Device Role / Timing Role: Ruggedized SAR ADC providing isolated, drift-stable digitization of 4–20 mA loop-derived ±10 V signals. Use Value: Internal 2.048 V reference with 20 ppm/°C max drift maintains calibration integrity without periodic field recalibration. |
| High Speed Data Acquisition | Portable or Compact Instrumentation |
Use Scenario: Embedded DAQ modules in automated test equipment performing FFT-based spectral analysis on vibration signals. IC Role / Device Role / Timing Role: Low-latency, zero-cycle-delay ADC feeding FPGA-based signal processing pipelines with deterministic timing. Use Value: 500 ksps throughput with 100 dB SNR enables 32k-point FFTs resolving harmonics below –115 dB THD at 2 kHz input. | Use Scenario: Battery-powered handheld oscilloscopes and multimeters requiring high resolution in compact form factors. IC Role / Device Role / Timing Role: Power-optimized ADC using nap/sleep modes to extend runtime while preserving 18-bit precision. Use Value: 35 mW active power and 300 µW sleep current allow >10-hour operation on single-cell Li-ion batteries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1 MSPS, ±VREF input, external reference only, no internal buffer, 125°C rated | Higher speed but lower resolution; requires external reference design and signal conditioning for ±10.24 V inputs | Select when sampling rate >500 ksps is mandatory and 16-bit ENOB suffices for system requirements. |
| AD7606C-18BSTZ | 18-bit, 1 MSPS, simultaneous sampling, ±10 V input range, integrated PGA, 8-channel, 125°C rated | Multi-channel, integrated analog front-end; larger footprint (64-lead LQFP) and higher power (120 mW) | Select when multi-channel synchronized acquisition is needed and board space allows larger package. |
Compared with ADS8860IDRCT and AD7606C-18BSTZ, the LTC2337HMS-18#PBF delivers superior SNR (100 dB vs ≤95 dB) and lower INL (±4 LSB vs ±6 LSB) in a minimal 16-pin MSOP, making it optimal for single-channel, ultra-low-noise, space-constrained industrial DAQ designs.
Availability
LTC2337HMS-18#PBF is available at Aetrix Electronics and suitable for programmable logic controllers, industrial process control systems, and high-speed data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2337HMS-18#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 semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC2337-18 product line was developed by Linear Technology to address demand for high-accuracy, low-power, extended-temperature SAR ADCs in industrial automation and test equipment-emphasizing ease of use via integrated references and robust SPI interfaces.
FAQ
What is the maximum operating temperature of the LTC2337HMS-18#PBF?
The LTC2337HMS-18#PBF is rated for operation from –40°C to +125°C ambient temperature. This H-grade qualification is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section, where all key parameters-including INL, SNR, and reference drift-are specified over this full range. The device's thermal resistance (θJA = 110°C/W) and maximum junction temperature (150°C) further validate its suitability for high-temperature industrial environments.
Does the LTC2337HMS-18#PBF require an external reference?
No, the LTC2337HMS-18#PBF does not require an external reference. It integrates a factory-trimmed 2.048 V bandgap reference with ≤20 ppm/°C drift and an onboard buffer that outputs 4.096 V at the REFBUF pin-enabling direct ±10.24 V true bipolar operation. An external reference may be used (1.25 V–2.4 V applied to REFIN) for improved accuracy, but it is optional-not required-for functional operation.
How does the nap mode reduce power consumption in the LTC2337HMS-18#PBF?
The LTC2337HMS-18#PBF automatically enters nap mode between conversions, reducing supply current from 7.5 mA (active) to 3.9 mA (conversion done) and scaling linearly with sampling rate. At 500 ksps, typical active power is 35 mW; at 50 ksps, nap-mode current drops to ~0.4 mA, cutting power to ~2 mW. This dynamic scaling is intrinsic to the SAR architecture and requires no software intervention-only proper CNV timing.
Can multiple LTC2337HMS-18#PBF devices be connected on a single SPI bus?
Yes, the LTC2337HMS-18#PBF supports daisy-chain mode via the CHAIN pin. When CHAIN is high, the RDL/SDI pin becomes a serial data input, allowing up to 16 devices to share one SPI bus (SCK, BUSY, CNV) with only one SDO line per chain. Data is shifted out sequentially on SDO after each conversion, eliminating the need for individual chip-select lines and simplifying multi-channel system design.
What is the input impedance of the LTC2337HMS-18#PBF analog inputs?
The analog input impedance of the LTC2337HMS-18#PBF is modeled as a 2.083 kΩ resistive divider network (per input) in series with 45 pF sampling capacitance. This structure attenuates and level-shifts the ±10.24 V input to the 0–4.096 V range of the internal ADC core. For optimal performance, sources should drive this network with low-impedance buffers-especially for high-frequency or high-precision applications-to minimize gain error and settling-time-induced distortion.
LTC2337HMS-18#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- 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:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2337HMS-18#PBF FAQ
1.How can I place an order for LTC2337HMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2337HMS-18#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 LTC2337HMS-18#PBF reliable?
The price and inventory of LTC2337HMS-18#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2337HMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2337HMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2337HMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2337HMS-18#PBF?
LTC2337HMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2337HMS-18#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 LTC2337HMS-18#PBF?
For technical support, including LTC2337HMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2337HMS-18#PBF requirements.
6.How does Aetrix verify that LTC2337HMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2337HMS-18#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 LTC2337HMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2337HMS-18#PBF?
All LTC2337HMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2337HMS-18#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 LTC2337HMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2337HMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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