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Analog Devices Inc. LTC1851IFW#PBF
- Part No.:
- LTC1851IFW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
LTC1851IFW#PBF.pdf
- Description:
- IC ADC 12BIT SAR 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,705
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Product details
Overview
LTC1851IFW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 1.25Msps parallel-output successive approximation ADC with integrated 8-channel multiplexer, internal 2.5V reference and buffer, programmable sequencer, and true differential input capability. It operates from a single 5V supply, consumes 40mW typical power, and supports unipolar/bipolar, single-ended/differential configurations with two gain ranges - designed for high-speed industrial data acquisition systems.
For engineers reviewing the LTC1851IFW#PBF datasheet, LTC1851IFW#PBF pinout, LTC1851IFW#PBF application, or LTC1851IFW#PBF equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in test & measurement and spectrum analysis, and confirmed alternative parts with documented functional differences.
Technical Context
The LTC1851IFW#PBF implements a capacitive successive approximation register (SAR) architecture with an internal sample-and-hold circuit, enabling 1.25Msps throughput with 650ns conversion time and 150ns acquisition time. Its flexible 8-channel multiplexer supports both single-ended and true differential inputs per channel pair (CH0/CH1, CH2/CH3, etc.), rejecting common-mode noise up to 60dB at DC.
Digital control includes a 16-location programmable sequencer with readback capability, mode selection via M0/M1 pins, and three power states: active, Nap (1mA), and Sleep (50µA). The parallel 16-bit output (12-bit result + 4-bit MUX address) is powered separately by OVDD (2.7–5.25V), enabling direct interfacing with 3V logic without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonicity and full-scale accuracy across all channels. |
| Sampling Rate | 1.25Msps maximum - enables real-time capture of signals up to 625kHz Nyquist bandwidth. |
| INL / DNL | ±0.35 / ±0.25 LSB (typ) - ensures high code-to-code linearity critical for precision instrumentation. |
| SNR / SFDR | 72dB / 88dB (typ, bipolar, PGA=1) - supports clean spectral analysis in telecom and spectrum monitoring applications. |
| Power Supply | Single 4.75–5.25V VDD; separate 2.7–5.25V OVDD - decouples analog and digital domains for noise isolation. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments including factory automation and process control. |
| Reference | Internal 2.5V reference with 4.096V REFCOMP output (±15ppm/°C TC) - eliminates external reference component count. |
Pinout & Package
Package: 48-lead plastic TSSOP (FW package), RoHS-compliant, thermal resistance θJA = 110°C/W, rated for 150°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Configurable as single-ended vs. true differential pairs (e.g., CH0/CH1); COM pin serves as common reference in single-ended mode. |
| REFCOMP (Pin 12) | Reference Buffer Output | Provides 4.096V full-scale reference voltage (1.638× REFIN); bypassed with 10µF tantalum + 0.1µF ceramic for stability. |
| D11–D0 (Pins 21,22,23,24–32) | Parallel Data Outputs | 12-bit conversion result + 4-bit MUX address; outputs swing between OVDD and OGND, compatible with 3V logic when OVDD = 3.3V. |
| CONVST (Pin 45) | Conversion Start | Active-low edge-triggered input; falling edge initiates SAR conversion cycle - timing-critical for deterministic sampling. |
| M0/M1 (Pins 36,48) | Mode Control Inputs | Select operating modes: Direct Address, Program, Readback, or Scan - enable flexible sequencing without host processor overhead. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable 16-step sequencer | Stores channel address, gain (PGA), polarity (UNI/BIP), and differential mode per step - enables autonomous multi-channel acquisition sequences. |
| True differential input rejection | 60dB CMRR at DC, maintained across frequency - suppresses noise in motor drive current sensing and sensor bridge interfaces. |
| Separate OVDD supply | Independent 2.7–5.25V digital output rail - allows direct connection to 3V FPGA or microcontroller I/O without level-shifting components. |
| Nap/Sleep shutdown modes | Reduces supply current to 1mA (Nap) or 50µA (Sleep) - extends uptime in battery-powered portable test equipment. |
| Internal reference buffer | Generates stable 4.096V full-scale reference from internal 2.5V source or external REFIN - eliminates need for precision external reference ICs. |
Applications
| Test & Measurement Equipment | Spectrum Analysis Systems |
|---|---|
Use Scenario: High-speed waveform capture in benchtop oscilloscopes and automated test systems requiring synchronized multi-channel sampling. IC Role / Device Role / Timing Role: Primary ADC front-end with integrated MUX and sequencer - performs simultaneous channel scanning at 1.25Msps with deterministic latency. Use Value: Eliminates external MUX and timing controller; 12-bit resolution and 72dB SNR support accurate amplitude and harmonic analysis of complex waveforms. | Use Scenario: Real-time RF signal monitoring in base station analyzers and EMI pre-compliance testers. IC Role / Device Role / Timing Role: Digitizes downconverted IF signals with low aperture jitter (2ps RMS) - preserves phase coherence for FFT-based spectral estimation. Use Value: 88dB SFDR and 82dB THD enable detection of weak spurs adjacent to strong carriers within 625kHz bandwidth. |
| Industrial Process Control | Imaging Systems |
Use Scenario: Multi-sensor monitoring in PLC analog input modules measuring temperature, pressure, and flow using RTDs and strain gauges. IC Role / Device Role / Timing Role: Precision data acquisition node with programmable gain (1×/2×) and bipolar/unipolar range selection - adapts to diverse sensor output spans. Use Value: ±0.35 LSB INL and ±15ppm/°C reference TC ensure <0.01% full-scale error over –40°C to +85°C ambient range. | Use Scenario: Line-scan CCD or CMOS image sensor digitization in medical endoscopes and industrial inspection cameras. IC Role / Device Role / Timing Role: High-fidelity pixel data converter with low crosstalk (<–100dB at 1MHz) between adjacent channels - preserves spatial fidelity. Use Value: >100dB channel-to-channel isolation (worst pair, bipolar mode) prevents ghosting and smear artifacts in high-resolution imaging pipelines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar data acquisition applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8688IPWR | 16-bit, 500ksps, SPI interface, integrated PGA and reference; no parallel bus or built-in sequencer. | Better resolution but lower speed; requires external controller for sequencing; suited for low-power, high-precision sensor nodes. | Choose ADS8688IPWR when resolution >12-bit and SPI integration outweigh parallel interface and autonomous scan needs. |
| AD7606BSTZ | 16-bit, 200ksps, parallel/serial interface, 8-channel simultaneous sampling, on-chip PGA and reference. | Simultaneous sampling per channel (vs. multiplexed), lower throughput, higher power; optimized for anti-aliasing in power quality meters. | Choose AD7606BSTZ when phase-coherent multi-channel capture (e.g., 3-phase voltage/current) is required over speed. |
Compared with ADS8688IPWR and AD7606BSTZ, the LTC1851IFW#PBF uniquely balances 1.25Msps multiplexed throughput, on-chip sequencer autonomy, and parallel 3V-compatible output - making it optimal for cost-sensitive, high-speed industrial DAQ where host processor offload and minimal BOM count are critical.
Availability
LTC1851IFW#PBF is available at Aetrix Electronics and suitable for test & measurement equipment, spectrum analysis systems, and industrial process control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1851IFW#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 LTC1851IFW#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered specifically for high-speed, multi-channel industrial and instrumentation systems demanding integrated functionality, low power, and robust operation across extended temperature ranges.
FAQ
What is the maximum sampling rate supported by the LTC1851IFW#PBF?
The LTC1851IFW#PBF supports a maximum sampling rate of 1.25Msps, achieved with 650ns conversion time and 150ns acquisition time. This rate is guaranteed over the full –40°C to +85°C operating temperature range and with VDD = 4.75V to 5.25V. At this rate, the device maintains 72dB SNR and 88dB SFDR in bipolar mode with PGA = 1, making it suitable for demanding real-time acquisition tasks.
Does the LTC1851IFW#PBF require an external reference voltage?
No, the LTC1851IFW#PBF does not require an external reference voltage. It integrates a 2.5V bandgap reference and a precision reference buffer that generates a stable 4.096V output on the REFCOMP pin. This internal reference is accurate to ±0.1% initial tolerance and exhibits ±15ppm/°C temperature coefficient - sufficient for most 12-bit applications without external components.
How does the programmable sequencer in the LTC1851IFW#PBF operate?
The LTC1851IFW#PBF features a 16-location programmable sequencer that stores channel address, gain (PGA), polarity (UNI/BIP), and differential mode (DIFF) for each step. Once programmed via WR pulses in Program mode, the sequencer autonomously cycles through entries on each CONVST trigger. The current location can be read back in Readback mode using RD and M0/M1 controls - reducing host processor overhead in continuous acquisition systems.
Can the LTC1851IFW#PBF interface directly with 3V logic systems?
Yes, the LTC1851IFW#PBF can interface directly with 3V logic systems. Its digital outputs (D11–D0, A2OUT–A0OUT, DIFFOUT) are powered by the separate OVDD supply, which accepts 2.7V to 5.25V. When OVDD = 3.3V, outputs swing fully between 0V and 3.3V with VOH ≥ 3.0V and VOL ≤ 0.4V under load - meeting standard 3V CMOS input thresholds without level shifters.
What are the power consumption characteristics of the LTC1851IFW#PBF in shutdown modes?
In Nap mode (SHDN = 0V, CS = 0V), the LTC1851IFW#PBF draws 1mA typical supply current and dissipates 5mW. In Sleep mode (SHDN = 0V, CS = 5V), it draws only 50µA and dissipates 0.25mW. Both modes retain register contents and reference bias; wake-up time from Nap mode is 200ns, while Sleep mode requires 10ms due to reference capacitor recharge - critical for portable or energy-constrained DAQ designs.
LTC1851IFW#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1851IFW#PBF FAQ
1.How can I place an order for LTC1851IFW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1851IFW#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 LTC1851IFW#PBF reliable?
The price and inventory of LTC1851IFW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1851IFW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1851IFW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1851IFW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1851IFW#PBF?
LTC1851IFW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1851IFW#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 LTC1851IFW#PBF?
For technical support, including LTC1851IFW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1851IFW#PBF requirements.
6.How does Aetrix verify that LTC1851IFW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1851IFW#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 LTC1851IFW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1851IFW#PBF?
All LTC1851IFW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1851IFW#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 LTC1851IFW#PBF part is unused and in its original packaging.
Return procedure for LTC1851IFW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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