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Analog Devices Inc. LTC1851CFW#PBF
- Part No.:
- LTC1851CFW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
LTC1851CFW#PBF.pdf
- Description:
- IC ADC 12BIT SAR 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,921
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Product details
Overview
LTC1851CFW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 1.25 Msps parallel-output successive approximation ADC with integrated 8-channel multiplexer, internal 2.5V reference, reference buffer, and programmable sequencer. It supports single-ended/differential inputs, dual gain ranges (1×/2×), unipolar/bipolar operation, and operates from a single 5V supply with 40mW typical power dissipation. It is used in high-speed data acquisition for test equipment and industrial process monitoring.
For engineers reviewing the LTC1851CFW#PBF datasheet, LTC1851CFW#PBF pinout, LTC1851CFW#PBF application, or LTC1851CFW#PBF equivalent, key selection criteria include its 12-bit resolution with ±0.35 LSB INL, 4.096V full-scale reference capability, 48-lead TSSOP package, 72 dB SNR at 47 kHz, and support for scan-mode sequencing across eight analog channels.
Technical Context
The LTC1851CFW#PBF implements a capacitive successive approximation register (SAR) architecture with an internal sample-and-hold circuit optimized for 1.25 Msps throughput. Its conversion cycle comprises a 150 ns acquisition phase followed by a 650 ns conversion phase, enabling precise sampling of fast-changing signals without external hold circuitry.
It integrates a flexible 8-channel analog multiplexer configurable per channel for input mode (single-ended/differential), polarity (unipolar/bipolar), and gain (1×/2×), controlled via dedicated digital inputs (DIFF, UNI/BIP, PGA, A0–A2) and managed by an on-chip 16-location programmable sequencer with readback capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer function and deterministic code transitions across full dynamic range. |
| Sampling Rate | 1.25 Msps maximum - supports real-time capture of signals up to 625 kHz Nyquist bandwidth with minimal aliasing. |
| INL Error | ±0.35 LSB (max) - ensures accurate amplitude representation in precision measurement applications such as spectrum analysis. |
| SNR | 72 dB at 47 kHz input - enables >11.6 effective number of bits (ENOB) for high-fidelity signal digitization. |
| Reference Output | 4.096 V on REFCOMP (with 2.5 V on REFIN) - provides precise, temperature-stable full-scale span for calibrated sensor interfaces. |
| Power Dissipation | 40 mW at 1.25 Msps (5 V supply) - allows integration into thermally constrained embedded systems without active cooling. |
| Digital Interface | 16-bit parallel output (12-bit data + 4-bit MUX address) - simplifies FPGA/microcontroller interfacing with no serial protocol overhead. |
Pinout & Package
Package: 48-lead plastic TSSOP (FW package), 0°C to 70°C operating temperature range, lead-free and RoHS-compliant (indicated by #PBF suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Eight configurable analog inputs supporting single-ended (vs. COM) or differential (paired CH0/CH1 etc.) acquisition with programmable gain and polarity. |
| REFCOMP (Pin 12) | Reference Buffer Output | Provides 4.096 V full-scale reference voltage (when REFIN = 2.5 V); sets analog input span and directly impacts gain accuracy and offset stability. |
| D11–D0 (Pins 21,22,23,24–32) | Parallel Data Outputs | 12-bit conversion result (D11–D0) plus 4-bit MUX address (A2OUT/A1OUT/A0OUT/DIFFOUT) - enables simultaneous data and channel identification during readout. |
| CONVST (Pin 45) | Conversion Start Input | Active-low edge-triggered signal initiating SAR conversion; timing-critical for synchronization with external sampling clocks or trigger events. |
| BUSY (Pin 33) | Conversion Status Output | Active-low open-drain signal indicating conversion in progress; rising edge marks data validity for latch-based capture. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable 16-step sequencer | Enables autonomous scanning across arbitrary channel/gain/polarity combinations without host CPU intervention - reduces firmware overhead in multi-sensor systems. |
| True differential input rejection | 60 dB CMRR over DC–1 MHz - suppresses common-mode noise in industrial environments with long sensor cables or noisy power rails. |
| Separate OVDD supply (2.7–5.25 V) | Allows direct interface to 3 V logic families (e.g., FPGA I/O banks) without level shifters - simplifies PCB design and improves signal integrity. |
| Nap/Sleep shutdown modes | Reduces current to 1 mA (Nap) or 50 µA (Sleep) - extends battery life in portable instrumentation and enables rapid wake-up (<200 ns) for event-driven sampling. |
| Internal 2.5 V reference + buffer | Eliminates need for external reference IC and decoupling network - saves board space and improves system-level accuracy by removing inter-device drift sources. |
Applications
| Test & Measurement Equipment | Industrial Process Control |
|---|---|
Use Scenario: High-speed waveform capture in benchtop oscilloscopes and automated test systems requiring sub-microsecond sampling resolution. IC Role / Device Role / Timing Role: Primary ADC front-end converting analog sensor outputs or signal chain outputs into parallel digital words synchronized to system clock and trigger signals. Use Value: 1.25 Msps rate and 72 dB SNR enable accurate reconstruction of transient events and harmonic content up to 625 kHz, meeting IEEE 1057 compliance requirements. | Use Scenario: Multi-point temperature, pressure, and flow monitoring in PLC I/O modules with isolated field inputs. IC Role / Device Role / Timing Role: Centralized analog acquisition hub handling eight sensor channels with programmable gain and bipolar range to accommodate diverse transducer outputs. Use Value: Integrated sequencer and differential inputs reduce external component count and improve noise immunity in electrically noisy factory environments. |
| Spectrum Analysis Systems | Imaging Signal Chains |
Use Scenario: Real-time spectral analysis in RF interference detection and EMI pre-compliance testing. IC Role / Device Role / Timing Role: Digitizer capturing baseband or IF signals for FFT processing; configured in unipolar mode with 2× gain for low-level RF detector outputs. Use Value: 84 dB SFDR (bipolar, PGA=0) minimizes spurious artifacts that could mask weak signals near strong carriers in frequency-domain analysis. | Use Scenario: Digital X-ray or ultrasound front-end where multiple photodiode or piezoelectric sensor outputs require synchronized sampling. IC Role / Device Role / Timing Role: Channel-multiplexed ADC providing time-aligned samples from spatially distributed sensors under precise sequence control. Use Value: 150 ns acquisition time and <2 ps aperture jitter ensure minimal time-skew between channels - critical for coherent beamforming and image reconstruction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7928BRUZ | 12-bit, 1 Msps, SPI interface, no integrated sequencer or reference buffer; requires external 2.5 V reference. | Lower sampling rate and serial interface increase host processor load; lacks autonomous scan capability. | Select when board space is constrained and SPI interface is preferred over parallel; verify external reference stability meets ±15 ppm/°C spec. |
| LTC2315ITS8#TRMPBF | 14-bit, 2.5 Msps, single-channel, no multiplexer or sequencer; uses external reference and has no internal buffer. | Higher resolution but no multichannel capability - requires external analog switching for >1 channel. | Choose for single-channel high-dynamic-range applications (e.g., precision sensor calibration); not suitable as drop-in replacement for 8-channel use cases. |
Compared with AD7928BRUZ and LTC2315ITS8#TRMPBF, the LTC1851CFW#PBF uniquely combines 12-bit resolution, 1.25 Msps speed, integrated 8-channel mux, on-chip sequencer, and reference buffer - reducing BOM count and firmware complexity in compact multichannel DAQ designs.
Availability
LTC1851CFW#PBF is available at Aetrix Electronics and suitable for test & measurement equipment, industrial process control systems, and spectrum analysis hardware requiring stable component supply, long-term manufacturability, and guaranteed RoHS compliance.
Supply support for LTC1851CFW#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 LTC1851CFW#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for embedded systems requiring integrated, low-footprint, high-speed multichannel ADC functionality without external support components.
FAQ
What is the maximum sampling rate supported by the LTC1851CFW#PBF?
The LTC1851CFW#PBF supports a maximum sampling rate of 1.25 Msps, achieved through its internal successive approximation register (SAR) architecture and optimized sample-and-hold circuit. This rate is guaranteed across the full 0°C to 70°C operating temperature range with VDD = 4.75 V to 5.25 V and proper decoupling. At this rate, the device delivers 72 dB SNR and maintains ±0.35 LSB integral nonlinearity performance.
Does the LTC1851CFW#PBF include an internal voltage reference?
Yes, the LTC1851CFW#PBF integrates a precision 2.5 V bandgap reference and a reference buffer amplifier. When REFIN is tied to 2.5 V, the REFCOMP pin outputs 4.096 V - a value selected for exact 12-bit full-scale scaling (2¹² × 1 mV). The reference exhibits ±15 ppm/°C temperature coefficient and 0.01 LSB/V line regulation, eliminating the need for external reference ICs in most applications.
How many analog input channels does the LTC1851CFW#PBF support, and what configurations are available?
The LTC1851CFW#PBF supports eight analog input channels (CH0–CH7) configurable as single-ended (referenced to COM) or true differential pairs (CH0/CH1, CH2/CH3, etc.). Each channel can be independently set for unipolar or bipolar operation and gain of 1× (PGA = 1) or 2× (PGA = 0) via dedicated control pins and the programmable sequencer - enabling mixed-mode acquisition within a single conversion sequence.
What digital interface options does the LTC1851CFW#PBF provide?
The LTC1851CFW#PBF features a 16-bit parallel output interface: 12 data bits (D11–D0) and 4 multiplexer address bits (A2OUT/A1OUT/A0OUT/DIFFOUT), all three-state and powered by a separate OVDD supply (2.7–5.25 V). It uses standard control signals - CONVST (active-low start), BUSY (status), RD (read strobe), CS (chip select), and WR (write) - enabling direct connection to microcontrollers, FPGAs, or ASICs without protocol translation.
What power-saving modes are available on the LTC1851CFW#PBF?
The LTC1851CFW#PBF offers two low-power shutdown modes: Nap mode (SHDN = 0 V, CS = 0 V) draws 1 mA and wakes in 200 ns; Sleep mode (SHDN = 0 V, CS = 5 V) draws only 50 µA but requires 10 ms wake-up when using a 10 µF REFCOMP bypass capacitor. Both modes retain sequencer memory and reference bias states, allowing rapid resumption of acquisition without reinitialization.
LTC1851CFW#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:
- 12
- 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:
- -
LTC1851CFW#PBF FAQ
1.How can I place an order for LTC1851CFW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1851CFW#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 LTC1851CFW#PBF reliable?
The price and inventory of LTC1851CFW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1851CFW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1851CFW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1851CFW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1851CFW#PBF?
LTC1851CFW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1851CFW#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 LTC1851CFW#PBF?
For technical support, including LTC1851CFW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1851CFW#PBF requirements.
6.How does Aetrix verify that LTC1851CFW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1851CFW#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 LTC1851CFW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1851CFW#PBF?
All LTC1851CFW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1851CFW#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 LTC1851CFW#PBF part is unused and in its original packaging.
Return procedure for LTC1851CFW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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