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Analog Devices Inc. LTC1851CFW#TRPBF
- Part No.:
- LTC1851CFW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
LTC1851CFW#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,378
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Product details
Overview
LTC1851CFW#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 1.25Msps parallel-output 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 systems requiring channel scanning and flexible analog front-end configuration.
For engineers reviewing the LTC1851CFW#TRPBF datasheet, LTC1851CFW#TRPBF pinout, LTC1851CFW#TRPBF application, or LTC1851CFW#TRPBF equivalent, key selection considerations include its 12-bit resolution, 1.25Msps sampling rate, 48-lead TSSOP package, 4.096V reference output capability, and support for programmable scan sequences up to 16 addresses - critical for industrial process control, test instrumentation, and spectrum analysis designs.
Technical Context
The LTC1851CFW#TRPBF implements a capacitive successive approximation register (SAR) architecture with an internal wideband sample-and-hold circuit. Its conversion cycle comprises a 150ns acquisition phase followed by a 650ns conversion phase, achieving full 12-bit accuracy within 800ns total time.
It features a fully configurable 8-channel analog multiplexer with per-channel gain (PGA = 1 or 2) and polarity (unipolar/bipolar) control via dedicated digital inputs (PGA, UNI/BIP, DIFF, A0–A2). The programmable sequencer stores up to 16 channel-address/configurations and supports readback mode for verification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonicity and full-scale linearity for precision measurement applications. |
| Sampling Rate | 1.25Msps maximum - enables real-time capture of signals up to 625kHz (Nyquist) without aliasing in baseband applications. |
| INL / DNL | ±0.35 / ±0.25 LSB (typ) - ensures high code-to-code accuracy essential for dynamic signal fidelity in spectrum analysis and imaging. |
| SNR / SFDR | 72dB / 88dB (typ, bipolar, PGA=1) - delivers >11.5 effective number of bits (ENOB) for clean digitization of low-distortion waveforms. |
| Reference Output | 4.096V on REFCOMP (with 2.5V on REFIN) - provides precise, temperature-stable full-scale span for 12-bit systems with 1mV LSB step size. |
| Power Supply | Single 4.75V–5.25V VDD; separate 2.7V–5.25V OVDD - allows direct interfacing to 3V or 5V logic without level shifters. |
| Operating Temp | 0°C to +70°C (C-grade) - qualified for commercial and industrial environments where ambient stability is required. |
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 (1–8) | Analog Input Channels | Eight differential-pair-capable inputs; configured as single-ended vs COM or differential pairs (CH0/CH1, etc.) via DIFF pin. |
| COM (9) | Analog Common Reference | Return node for single-ended operation; disabled when DIFF = high - enables true differential noise rejection. |
| REFOUT (10) | 2.5V Internal Reference Output | Stable 2.5V source for external use; requires 1µF bypass to AGND for low-noise operation. |
| REFCOMP (12) | Programmable Reference Output | 4.096V (typ) output derived from REFIN × 1.6384; sets full-scale input range and determines LSB voltage step. |
| D11–D0 (21,22,23,24–32) | Parallel Data Outputs | 12-bit conversion result + 4-bit MUX address; three-state outputs powered by OVDD - simplifies interface to 3V/5V microcontrollers. |
| BUSY (33) | Conversion Status Flag | Active-low open-drain output; falling edge initiates conversion, rising edge indicates data ready - usable as latch strobe. |
| CONVST (45) | Conversion Start Trigger | Edge-sensitive input; falling edge starts acquisition - timing-critical for synchronous multi-device sampling. |
| M0/M1 (36,48) | Mode Control Inputs | Select Direct Address, Program, or Readback modes - enables firmware-controlled sequencer programming and verification. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable 16-step sequencer | Enables autonomous multi-channel scanning without host CPU intervention - reduces software overhead in embedded DAQ systems. |
| True differential input pairs | Rejects common-mode noise up to 60dB at DC–1MHz - critical for sensor interfaces in electrically noisy industrial settings. |
| Separate OVDD supply for digital outputs | Allows direct connection to 3V logic families while maintaining 5V analog performance - eliminates level-shifter components. |
| Nap/Sleep shutdown modes | Reduces current to 1mA (Nap) or 50µA (Sleep) - extends battery life in portable test equipment between acquisitions. |
| Internal reference buffer with strappable ranges | Supports 4.096V, 2.5V, or 2.048V full-scale spans via REFIN configuration - simplifies system-level calibration and scaling. |
Applications
| Test & Measurement Equipment | Industrial Process Control |
|---|---|
Use Scenario: High-speed voltage/current monitoring in automated calibration benches and benchtop DMMs. IC Role / Device Role / Timing Role: Primary 12-bit digitizer capturing multi-channel sensor data at 1.25Msps with synchronized trigger via CONVST. Use Value: 72dB SNR and ±0.35 LSB INL ensure traceable metrology-grade accuracy across temperature and time. | Use Scenario: Real-time analog input acquisition in PLC I/O modules handling thermocouples, RTDs, and 4–20mA transmitters. IC Role / Device Role / Timing Role: Front-end ADC with programmable gain and bipolar support for universal analog input conditioning. Use Value: Differential channel pairs and 60dB CMRR suppress EMI from motor drives and solenoids in factory-floor environments. |
| Imaging Systems | Telecommunications Signal Analysis |
Use Scenario: Digitizing CCD/CMOS sensor outputs or laser diode feedback signals in medical and industrial scanners. IC Role / Device Role / Timing Role: High-fidelity analog capture block with low aperture jitter (2ps RMS) for pixel-level timing integrity. Use Value: 88dB SFDR preserves signal purity during FFT-based image reconstruction and defect detection algorithms. | Use Scenario: Baseband signal sampling in RF test receivers, spectrum analyzers, and channel emulation hardware. IC Role / Device Role / Timing Role: Wideband ADC with 1.25Msps throughput and programmable sequencing for multi-tone or modulated signal capture. Use Value: Bipolar mode + PGA flexibility accommodates varying IF signal amplitudes without external attenuators or amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, multi-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7327BRUZ | 12-bit, 8-channel, ±10V/±5V/±2.5V/0–10V input ranges; serial SPI interface; no internal reference buffer. | Requires external reference and level-shifting for 3V logic; better suited for systems prioritizing voltage range flexibility over parallel speed. | Select when wider input voltage compliance and SPI bus integration outweigh need for parallel throughput and internal reference. |
| MAX11627ETI+ | 12-bit, 8-channel, 250ksps max; I²C interface; internal 2.048V reference; smaller 24-TQFN package. | Lower sampling rate and serial interface limit use in real-time streaming; optimized for space-constrained, low-power sensor nodes. | Select for battery-powered IoT edge devices where 250ksps suffices and PCB area is constrained. |
Compared with AD7327BRUZ and MAX11627ETI+, the LTC1851CFW#TRPBF uniquely combines 1.25Msps parallel output, integrated 4.096V reference buffer, and programmable sequencer in a single 48-TSSOP package - making it optimal for high-throughput, self-contained DAQ subsystems where timing determinism and minimal external components are critical.
Availability
LTC1851CFW#TRPBF is available at Aetrix Electronics and suitable for test and measurement equipment, industrial process control systems, imaging subsystems, and telecommunications signal analysis hardware requiring stable component supply, long-term production continuity, and guaranteed C-grade temperature performance.
Supply support for LTC1851CFW#TRPBF 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, serving precision instrumentation, industrial automation, communications, and healthcare markets.
The LTC1851CFW#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for high-speed, multi-channel, self-contained analog-to-digital conversion in space- and power-constrained embedded systems.
FAQ
What is the maximum sampling rate supported by the LTC1851CFW#TRPBF?
The LTC1851CFW#TRPBF supports a maximum sampling rate of 1.25Msps, with a total conversion time of 800ns (150ns acquisition + 650ns conversion). This rate is guaranteed across the full 0°C to +70°C operating temperature range and enables accurate digitization of signals up to 625kHz without aliasing.
Does the LTC1851CFW#TRPBF include an internal voltage reference?
Yes, the LTC1851CFW#TRPBF integrates a 2.5V bandgap reference with a buffered output (REFOUT) and a programmable reference amplifier (REFCOMP). When REFIN is set to 2.5V, REFCOMP delivers a precise 4.096V output - ideal for 12-bit systems requiring 1mV LSB resolution.
How does the programmable sequencer in the LTC1851CFW#TRPBF operate?
The LTC1851CFW#TRPBF's sequencer stores up to 16 channel configurations (address, gain, polarity, differential/single-ended) and scans them autonomously. Configuration is done via WR pulses in Program mode; contents can be verified using Readback mode with RD and M1/M0 controls - eliminating continuous host polling.
Can the LTC1851CFW#TRPBF interface directly with 3V microcontrollers?
Yes, the LTC1851CFW#TRPBF uses a separate OVDD supply pin (Pin 35) for its parallel digital outputs (D11–D0, A2OUT–A0OUT, DIFFOUT). By tying OVDD to 3V, all outputs swing between 0V and 3V - enabling direct, level-compatible connection to 3V logic without external translators.
What are the power-down modes available on the LTC1851CFW#TRPBF?
The LTC1851CFW#TRPBF offers two low-power states: Nap mode (SHDN = 0V, CS = 0V) draws 1mA, and Sleep mode (SHDN = 0V, CS = 5V) draws only 50µA. Both retain sequencer memory and reference bias - allowing fast wake-up (<200ns for Nap, ~10ms for Sleep) without reinitialization.
LTC1851CFW#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC1851CFW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1851CFW#TRPBF 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#TRPBF reliable?
The price and inventory of LTC1851CFW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1851CFW#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1851CFW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1851CFW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1851CFW#TRPBF?
LTC1851CFW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1851CFW#TRPBF 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#TRPBF?
For technical support, including LTC1851CFW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1851CFW#TRPBF requirements.
6.How does Aetrix verify that LTC1851CFW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1851CFW#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1851CFW#TRPBF?
All LTC1851CFW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1851CFW#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1851CFW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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