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Analog Devices Inc. LTC1850CFW#PBF
- Part No.:
- LTC1850CFW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
LTC1850CFW#PBF.pdf
- Description:
- IC ADC 10BIT SAR 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,859
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Product details
Overview
LTC1850CFW#PBF from Analog Devices (formerly Linear Technology) is a 10-bit, 8-channel, 1.25Msps successive approximation ADC with integrated 8-channel 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-latency conversion.
For engineers reviewing the LTC1850CFW#PBF datasheet, LTC1850CFW#PBF pinout, LTC1850CFW#PBF application, or LTC1850CFW#PBF equivalent, key selection criteria include its 1.25Msps sampling rate, 4.096V full-scale input span (via REFCOMP), 48-lead TSSOP package, 40mW typical power at 5V, and support for 3V logic interfacing via separate OVDD supply.
Technical Context
The LTC1850CFW#PBF implements a capacitive successive approximation register (SAR) architecture with integrated sample-and-hold, enabling precise 10-bit conversion in ≤800ns (acquisition + conversion). Its flexible 8-channel multiplexer allows per-channel configuration of input mode (single-ended/differential), polarity (unipolar/bipolar), and PGA gain (1× or 2×) via control pins and programmable sequencer memory.
Digital interface uses parallel 14-bit output (10-bit result + 4-bit MUX address) with three-state drivers powered by OVDD (2.7–5.25V), enabling direct connection to 3V or 5V logic. Control logic supports Direct Address, Scan, Program, and Readback modes via M0/M1, WR, RD, and CS signals - with dedicated BUSY output for timing synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit with no missing codes - guarantees monotonic transfer function for precision measurement applications. |
| Sampling Rate | 1.25Msps maximum - supports real-time acquisition of signals up to 625kHz Nyquist bandwidth. |
| Analog Input Range | ±2.048V (bipolar, gain=2) or 0–4.096V (unipolar, gain=1) - set by REFCOMP voltage and PGA/UNI/BIP configuration. |
| Integral Linearity | ±0.25 LSB max (over temperature) - ensures <0.025% FSR error for high-accuracy sensor digitization. |
| Power Dissipation | 40mW typical at 1.25Msps, 5V - enables compact, thermally constrained embedded DAQ designs. |
| Reference Output | REFOUT = 2.50V ±20mV - provides stable internal reference; REFCOMP = 4.096V ±36mV when REFIN = 2.5V. |
| Digital Supply | OVDD = 2.7–5.25V - decouples I/O voltage from analog VDD, simplifying mixed-voltage system integration. |
Pinout & Package
Package: 48-lead plastic TSSOP (FW package), 0°C to 70°C operating temperature range (C-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Configurable as single-ended vs. differential pairs (CH0/CH1, etc.); COM pin defines reference for single-ended mode. |
| REFCOMP (Pin 12) | Reference Buffer Output | Sets full-scale input span (e.g., 4.096V); driven internally or externally; requires 10µF + 0.1µF bypass. |
| D9/S2, D8/S1, D7/S0, D6–D0 (Pins 21–30) | Parallel Data Outputs | 10-bit conversion result + 4-bit MUX address; three-state, driven by OVDD/OGND - enables 3V/5V logic compatibility. |
| CONVST (Pin 45) | Conversion Start | Active-low edge-triggered signal; initiates SAR conversion cycle - timing-critical for deterministic latency. |
| BUSY (Pin 33) | Conversion Status Flag | Active-low open-drain output; falls at conversion start, rises at completion - used to latch valid data on parallel bus. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Sequencer Memory | Stores up to 16 channel configurations (address, gain, polarity, differential mode) - enables automated multi-channel scanning without host intervention. |
| True Differential Input Rejection | ≥60dB CMRR across 10Hz–1MHz - suppresses common-mode noise in motor control and industrial sensor interfaces. |
| Nap/Sleep Power-Down Modes | 1mA (Nap) or 50µA (Sleep) quiescent current - extends battery life in portable test equipment between acquisitions. |
| Flexible Reference Architecture | Internal 2.5V REFOUT + programmable REFCOMP (2.048V/4.096V) - eliminates external reference ICs while supporting precision unipolar/bipolar spans. |
| Channel-to-Channel Isolation | ≥90dB at 100kHz (worst pair, bipolar mode) - prevents crosstalk in simultaneous multi-sensor monitoring. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous logging of temperature, pressure, and flow sensors across 8 PLC I/O channels. IC Role / Device Role / Timing Role: 10-bit ADC core with programmable sequencer handles time-sliced sampling of all 8 analog inputs at 1.25Msps aggregate rate. Use Value: Eliminates need for external MUX and reference ICs; 40mW power enables fanless enclosure design. | Use Scenario: High-throughput parametric testing of semiconductor devices using synchronized analog stimulus/response capture. IC Role / Device Role / Timing Role: Parallel-output ADC with BUSY-driven latching delivers deterministic 800ns conversion latency for tight test loop timing. Use Value: 14-bit parallel bus (data + address) reduces controller overhead vs. SPI/I²C alternatives - increasing test station throughput. |
| Spectrum Analysis Front-End | Medical Instrumentation |
Use Scenario: Digitizing RF IF signals in handheld spectrum analyzers with real-time FFT processing. IC Role / Device Role / Timing Role: 1.25Msps sampling with 71dB SNR (PGA=1, unipolar) captures wideband baseband signals with minimal quantization noise. Use Value: Internal sample-and-hold and 60dB+ CMRR reject clock feedthrough and EMI - preserving dynamic range in noisy lab environments. | Use Scenario: Multi-parameter patient monitoring (ECG, respiration, SpO₂) in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-power 10-bit ADC with Nap mode (1mA) enables battery operation; differential inputs reject 50/60Hz mains interference. Use Value: Single 5V supply and integrated reference reduce BOM count and PCB area - critical for compact wearable form factors. |
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 only; no internal reference buffer or sequencer. | Requires external reference and FPGA/microcontroller for channel sequencing - increases firmware complexity. | Choose AD7928BRUZ when SPI interface suffices and higher resolution (12-bit) outweighs loss of autonomous scan capability. |
| LTC1851CFW#PBF | Pin-compatible 12-bit variant; identical package, pinout, and feature set - differs only in resolution and INL/DNL specs (±0.35/±0.25 LSB vs. ±0.25/±0.25 LSB). | Direct upgrade path for applications needing improved dynamic range without layout changes. | Choose LTC1851CFW#PBF when ENOB > 9.5 bits is required and system can accommodate slightly higher cost and power (45mW typical). |
Compared with AD7928BRUZ, LTC1850CFW#PBF offers autonomous sequencer and parallel interface for lower latency, while LTC1851CFW#PBF provides a drop-in 12-bit resolution upgrade - both retain identical TSSOP-48 footprint and control logic, minimizing redesign effort.
Availability
LTC1850CFW#PBF is available at Aetrix Electronics and suitable for industrial process control, automated test equipment, spectrum analysis front-ends, and portable medical instrumentation requiring stable component supply and long-term manufacturability.
Supply support for LTC1850CFW#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 LTC1850CFW#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for high-speed, multi-channel industrial and instrumentation applications where integration, low power, and deterministic timing are critical.
FAQ
What is the maximum sampling rate supported by the LTC1850CFW#PBF?
The LTC1850CFW#PBF supports a maximum sampling rate of 1.25Msps, with total conversion time (acquisition + conversion) guaranteed at ≤800ns over the full 0°C to 70°C operating range. This enables real-time digitization of signals up to 625kHz (Nyquist frequency) while maintaining specified linearity and noise performance.
Does the LTC1850CFW#PBF require an external reference voltage?
No, the LTC1850CFW#PBF includes an internal 2.5V reference (REFOUT) and reference buffer amplifier that generates a precise 4.096V output on REFCOMP when REFIN is tied to 2.5V. External references are optional - REFCOMP can be driven directly if higher accuracy or custom voltage is needed.
How does the programmable sequencer in the LTC1850CFW#PBF operate?
The LTC1850CFW#PBF's sequencer stores up to 16 channel configurations (MUX address, gain, polarity, differential mode) in on-chip memory. In Scan Mode, it automatically cycles through these entries - eliminating host CPU polling and enabling autonomous multi-channel acquisition with consistent timing.
Can the LTC1850CFW#PBF interface directly with 3V microcontrollers?
Yes, the LTC1850CFW#PBF supports 3V logic interfacing via its separate OVDD supply pin (2.7–5.25V range). All digital outputs (D9–D0, A2OUT–A0OUT, DIFFOUT) swing between OVDD and OGND, allowing direct connection to 3V FPGA or MCU I/O without level shifters.
What are the power-down modes available on the LTC1850CFW#PBF?
The LTC1850CFW#PBF offers two low-power states: Nap Mode (1mA supply current, SHDN=0V, CS=0V) and Sleep Mode (50µA, SHDN=0V, CS=5V). Both disable the ADC core and reference buffer while retaining sequencer memory - ideal for duty-cycled data loggers and portable instruments.
LTC1850CFW#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 48-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1850CFW#PBF FAQ
1.How can I place an order for LTC1850CFW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1850CFW#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 LTC1850CFW#PBF reliable?
The price and inventory of LTC1850CFW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1850CFW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1850CFW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1850CFW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1850CFW#PBF?
LTC1850CFW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1850CFW#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 LTC1850CFW#PBF?
For technical support, including LTC1850CFW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1850CFW#PBF requirements.
6.How does Aetrix verify that LTC1850CFW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1850CFW#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 LTC1850CFW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1850CFW#PBF?
All LTC1850CFW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1850CFW#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 LTC1850CFW#PBF part is unused and in its original packaging.
Return procedure for LTC1850CFW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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