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Analog Devices Inc. LTC1850IFW#PBF
- Part No.:
- LTC1850IFW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
LTC1850IFW#PBF.pdf
- Description:
- IC ADC 10BIT SAR 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,035
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Product details
Overview
LTC1850IFW#PBF from Analog Devices (formerly Linear Technology) is a 10-bit, 1.25Msps, 8-channel successive-approximation ADC with integrated multiplexer, internal 2.5V reference, reference buffer, and parallel digital interface. It supports single-ended/differential inputs, dual gain ranges (1×/2×), unipolar/bipolar operation, and programmable scan sequencing - used in high-speed industrial data acquisition systems requiring channel flexibility and low-power shutdown modes.
For engineers reviewing the LTC1850IFW#PBF datasheet, LTC1850IFW#PBF pinout, LTC1850IFW#PBF application, or LTC1850IFW#PBF equivalent, key selection considerations include its 48-pin TSSOP package, –40°C to +85°C industrial temperature grade, 40mW typical power at 1.25Msps, OVDD-compatible 3V logic interfacing, and configurable sequencer for automated multi-channel sampling.
Technical Context
The LTC1850IFW#PBF implements a capacitive SAR architecture with integrated sample-and-hold, supporting acquisition times as low as 150ns and conversion time of 650ns. Its flexible 8-channel analog multiplexer allows per-channel configuration via programmable sequencer memory (up to 16 entries), with real-time readback capability.
Digital control uses asynchronous parallel interface with active-low CONVST, RD, WR, CS, and SHDN signals. The device features two power-down modes - Nap (1mA IDD) and Sleep (50µA IDD) - selected by CS state during SHDN assertion, enabling rapid wake-up (200ns) or ultra-low quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit, no missing codes - guarantees monotonic transfer function for precision measurement applications. |
| Sampling Rate | 1.25Msps maximum - enables real-time capture of signals up to 625kHz Nyquist bandwidth. |
| Analog Input Range | ±REFCOMP/2 (bipolar, gain=1) or 0–REFCOMP (unipolar, gain=1) - full-scale span set by REFCOMP voltage (typically 4.096V). |
| Integral Linearity | ±0.25 LSB max (–40°C to +85°C) - ensures <0.025% FSR error across operating temperature range. |
| Power Dissipation | 40mW typical at 1.25Msps, 5V supply - optimized for embedded systems with thermal constraints. |
| Reference Output | Internal 2.5V REFOUT with ±15ppm/°C tempco - stable reference source for external circuitry or calibration. |
| Digital I/O Supply | OVDD = 2.7V to 5.25V - allows direct interfacing with 3V or 5V logic without level shifters. |
Pinout & Package
Package: 48-lead plastic TSSOP (FW package), 7.0mm × 12.0mm body, 0.5mm pitch, exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Configurable as single-ended vs. differential pairs (CH0/CH1, CH2/CH3, etc.) - supports mixed-signal sensor arrays. |
| COM (Pin 9) | Analog Input Common | Reference node for single-ended mode; disabled in differential mode - simplifies PCB layout for grounded sensors. |
| REFOUT (Pin 10) | 2.5V Reference Output | Stable buffered output for external circuitry; requires 1µF bypass to AGND - eliminates need for external reference IC. |
| REFIN/REFCOMP (Pins 11–12) | Reference Mode Control & Buffer Output | REFIN selects reference mode; REFCOMP delivers 1.638×REFIN (e.g., 4.096V for 2.5V input) - enables precise full-scale scaling. |
| D9–D0, A2OUT–A0OUT, DIFFOUT (Pins 21–30) | Parallel Data & Address Outputs | 10-bit result + 4-bit MUX address latched on BUSY rising edge - enables synchronous data capture without external FIFO. |
| CONVST, RD, WR, CS, SHDN (Pins 45–47, 43–44, 46) | Asynchronous Control Inputs | Edge- and level-sensitive signals for conversion trigger, data read, programming, chip select, and shutdown - supports both direct-address and sequencer modes. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable 16-entry sequencer | Enables autonomous multi-channel scanning with per-channel gain, polarity, and input mode settings - reduces host processor overhead in DAQ systems. |
| True differential input rejection | 60dB CMRR over DC–1MHz - suppresses noise in motor control feedback or industrial sensor interfaces. |
| Separate OVDD supply | Allows independent 3V digital interface while analog section runs at 5V - simplifies mixed-voltage system design and improves noise isolation. |
| Nap/Sleep shutdown modes | 1mA / 50µA quiescent current - extends battery life in portable test equipment and enables fast wake-up (<200ns) for burst-mode sampling. |
| Internal reference buffer | Drives REFCOMP with 4.096V ±0.3% accuracy and ±15ppm/°C drift - eliminates external op-amp and reduces BOM count. |
Applications
| Industrial Process Monitoring | Automated Test Equipment |
|---|---|
Use Scenario: Continuous monitoring of 8 pressure, temperature, and flow sensors in PLC-based factory automation. IC Role / Device Role / Timing Role: 10-bit ADC with programmable sequencer acquires synchronized samples across all channels at 100ksps average rate. Use Value: Eliminates need for external multiplexer and reference IC, reducing board area by >30% and improving channel-to-channel matching. | Use Scenario: High-throughput functional testing of analog front-ends in production line burn-in systems. IC Role / Device Role / Timing Role: Parallel-output ADC delivers conversion results within 800ns (acquisition + conversion), enabling tight test cycle timing. Use Value: 1.25Msps throughput supports >100k measurements/hour per unit, increasing test station utilization. |
| Spectrum Analysis Front-End | Medical Instrumentation |
Use Scenario: Digitizing baseband IF signals in portable RF spectrum analyzers with real-time FFT processing. IC Role / Device Role / Timing Role: ADC provides 71dB SNR and 82dB SFDR at 47kHz input - preserves dynamic range for narrowband signal detection. Use Value: Internal PGA and bipolar mode support direct digitization of AC-coupled sensor outputs without external amplification. | Use Scenario: Multi-parameter patient monitoring (ECG, respiration, SpO₂) in compact bedside units. IC Role / Device Role / Timing Role: Low-power 40mW operation and Sleep mode (0.25mW) extend battery runtime in portable configurations. Use Value: Integrated reference and sequencer reduce component count and improve long-term calibration stability vs. discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar data acquisition applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7928BRUZ | 8-channel, 12-bit, 1Msps SAR ADC; SPI interface; no internal reference buffer or sequencer. | Requires external reference and microcontroller-driven channel sequencing - increases firmware complexity and board space. | Choose when SPI interface and higher resolution outweigh need for autonomous scanning and integrated reference. |
| LTC1851IFW#PBF | Pin-compatible 12-bit version; identical package, pinout, and feature set - differs only in resolution and DNL/INL specs. | Same PCB layout and firmware; higher resolution enables finer quantization in vibration analysis or audio test. | Direct upgrade path if 12-bit resolution is required without redesign - shares same qualification, temperature grade, and supply requirements. |
Compared with AD7928BRUZ, LTC1850IFW#PBF offers integrated sequencer and reference buffer but lower resolution; compared with LTC1851IFW#PBF, it trades 2 bits of resolution for lower cost and reduced digital noise coupling in 10-bit applications.
Availability
LTC1850IFW#PBF is available at Aetrix Electronics and suitable for industrial process control, automated test equipment, and portable medical instrumentation requiring stable component supply, extended temperature operation (–40°C to +85°C), and long-term manufacturing continuity.
Supply support for LTC1850IFW#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC1850 series.
The LTC1850IFW#PBF belongs to Linear's high-performance data acquisition IC family, designed specifically for embedded systems needing integrated analog front-ends with minimal external components and deterministic timing behavior.
FAQ
What is the operating temperature range of the LTC1850IFW#PBF?
The LTC1850IFW#PBF is rated for industrial temperature operation from –40°C to +85°C. This is confirmed by the "I" grade suffix in the part number and specified in the Absolute Maximum Ratings table. The device maintains full performance across this range, including ±0.25 LSB integral linearity and 1.25Msps sampling rate, making it suitable for harsh environments like factory floors and outdoor instrumentation.
Does the LTC1850IFW#PBF require an external reference?
No, the LTC1850IFW#PBF includes an internal 2.5V reference and reference buffer amplifier. It generates a precise 4.096V output on REFCOMP (1.638×REFIN) when REFIN is tied to 2.5V, eliminating the need for external reference ICs. External references can be used by connecting REFIN to VDD and driving REFCOMP directly, but the internal solution is fully functional and calibrated.
How does the programmable sequencer work in the LTC1850IFW#PBF?
The LTC1850IFW#PBF contains a 16-location sequencer memory that stores MUX address, gain (PGA), unipolar/bipolar, and differential/single-ended settings per entry. In scan mode, it automatically cycles through these entries. Configuration is done via WR pulses in Program mode; contents can be read back using RD in Readback mode - enabling fully autonomous multi-channel acquisition without host intervention.
Can the LTC1850IFW#PBF interface directly with 3V logic systems?
Yes, the LTC1850IFW#PBF supports 3V logic interfacing via its separate OVDD supply pin (Pin 35). Digital outputs (D9–D0, A2OUT–A0OUT, DIFFOUT) swing between OGND and OVDD, allowing direct connection to 3V microcontrollers or FPGAs without level-shifting circuitry - verified by the OVDD specification of 2.7V to 5.25V and VOH/VOL values tested at 4.75V.
What are the power-down modes available on the LTC1850IFW#PBF?
The LTC1850IFW#PBF offers two hardware-controlled power-down modes: Nap mode (SHDN = 0V, CS = 0V) draws 1mA and wakes in 200ns; Sleep mode (SHDN = 0V, CS = 5V) draws 50µA and wakes in 10ms with 10µF REFCOMP bypass. Both modes retain sequencer memory and reference bias - enabling rapid resumption of acquisition in battery-powered or thermally constrained applications.
LTC1850IFW#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 1.25M
- Number of Inputs:
- 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- Parallel
- 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:
- Selectable Address
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1850IFW#PBF FAQ
1.How can I place an order for LTC1850IFW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1850IFW#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 LTC1850IFW#PBF reliable?
The price and inventory of LTC1850IFW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1850IFW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1850IFW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1850IFW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1850IFW#PBF?
LTC1850IFW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1850IFW#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 LTC1850IFW#PBF?
For technical support, including LTC1850IFW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1850IFW#PBF requirements.
6.How does Aetrix verify that LTC1850IFW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1850IFW#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 LTC1850IFW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1850IFW#PBF?
All LTC1850IFW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1850IFW#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 LTC1850IFW#PBF part is unused and in its original packaging.
Return procedure for LTC1850IFW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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