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Analog Devices Inc. LTC1853CFW#TRPBF
- Part No.:
- LTC1853CFW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
LTC1853CFW#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,179
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Product details
Overview
LTC1853CFW#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 400ksps successive-approximation ADC with integrated 8-channel multiplexer, internal 2.5V reference, and parallel output interface. It supports single-ended/differential inputs, unipolar/bipolar operation, and dual gain ranges (1×/2×), enabling flexible data acquisition in industrial process control and test equipment.
For engineers reviewing the LTC1853CFW#TRPBF datasheet, LTC1853CFW#TRPBF pinout, LTC1853CFW#TRPBF application, or LTC1853CFW#TRPBF equivalent, key selection criteria include its 12-bit resolution, 400ksps sampling rate, programmable sequencer for up to 16 channel configurations, low 3mW power at 250ksps (3V), and TSSOP-48 package compatibility with legacy LTC1851 designs.
Technical Context
The LTC1853CFW#TRPBF implements a capacitive successive-approximation architecture with integrated sample-and-hold, supporting both acquisition and conversion phases within 4.0μs max at 2.7V. Its analog front-end includes a configurable 8-channel multiplexer with pin-strappable input modes (single-ended/differential), polarity (unipolar/bipolar), and gain (1×/2×), all controlled via dedicated logic inputs (DIFF, UNI/BIP, PGA, A2–A0).
Digital control uses dual-mode logic (M0/M1) to select between direct addressing, scan mode, and programmable sequencer operation - the latter storing up to 16 channel-address-configurations in on-chip memory and supporting readback of current state. The parallel 16-bit output (12-bit data + 4-bit MUX address) is powered by separate OVDD (2.7–5.5V), enabling direct interfacing with 3V or 5V logic without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer function for precision measurement systems. |
| Sampling Rate | 400ksps maximum at 5V supply - supports real-time capture of signals up to 200kHz Nyquist bandwidth. |
| Integral Linearity | ±0.35 LSB typical - ensures <0.01% full-scale error across temperature for calibrated sensor interfaces. |
| Power Consumption | 3mW at 250ksps/3V - enables battery-powered portable instrumentation with extended runtime. |
| Analog Supply Range | 2.7V to 5.5V - allows operation from single Li-ion cell or standard 3.3V/5V rails without external regulators. |
| Digital I/O Supply | Separate OVDD (2.7–5.5V) - decouples ADC core from digital logic voltage, eliminating level-shifter requirements. |
| Reference Options | Internal 2.5V ±15ppm/°C or external 2.048V/2.5V/4.096V - provides flexibility for accuracy-critical applications requiring traceable calibration. |
Pinout & Package
Package: 48-lead plastic TSSOP (6.1mm wide), RoHS-compliant, 0°C to 70°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (1–8) | Analog Input Channels | Support single-ended (vs COM) or differential pairs (CH0/CH1, etc.) - selectable via DIFF pin; COM disabled when DIFF = high. |
| REFOUT (10), REFIN (11), REFCOMP (12) | Reference Subsystem | REFOUT delivers 2.5V internal reference; REFIN configures reference mode (ground = 2.048V, VDD = external drive, 2.5V = 4.096V out); REFCOMP sets full-scale span. |
| D11–D0 (21,22,23,24–32) | Parallel Data Output | 12-bit conversion result + 4-bit MUX address - active when RD low and CS low; outputs swing between OVDD/OGND. |
| CONVST (45), CS (46), RD (44), WR (43) | Control Interface | Asynchronous parallel protocol: CONVST falling edge initiates conversion; CS enables command recognition; RD latches data; WR programs sequencer. |
| M0/M1 (36,48), PGA (37), UNI/BIP (38), DIFF (42) | Configuration Inputs | Set operating mode (direct/scan/program), gain (1×/2×), polarity (unipolar/bipolar), and input topology (SE/diff) - static logic during conversion. |
| BUSY (33) | Status Output | Active-low open-drain signal indicating conversion in progress or sequencer programming active - used for timing synchronization or interrupt generation. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Sequencer | Stores 16 channel-address-configurations (gain, polarity, SE/diff) in on-chip memory - eliminates host CPU overhead for repetitive multi-channel scans. |
| Flexible Input Multiplexer | Configurable per-channel via hardware pins - supports mixed-mode acquisition (e.g., CH0–CH3 differential, CH4–CH7 single-ended) without firmware reconfiguration. |
| Nap/Sleep Power Modes | 0.5mA Nap (CS low) and 20μA Sleep (CS high) shutdown currents - enables rapid wake-up (<200ns) while minimizing standby power in intermittent-sampling systems. |
| Internal Reference Buffer | 1.6384× gain from REFIN to REFCOMP - allows precise 4.096V full-scale using standard 2.5V reference ICs, improving system-level accuracy vs external resistor dividers. |
| Parallel Output with Address | 16-bit bus (D11–D0 + S2–S0) - delivers conversion result and source channel ID simultaneously, simplifying data logging and channel-aware post-processing. |
Applications
| Industrial Process Monitoring | Portable Test Equipment |
|---|---|
Use Scenario: Continuous monitoring of 8 thermocouple, RTD, or pressure sensor outputs in factory automation PLC modules. IC Role / Device Role / Timing Role: Central 12-bit ADC acquiring synchronized samples across multiple analog channels with programmable gain and bipolar support for negative sensor offsets. Use Value: Eliminates need for external multiplexers, op-amps, and reference buffers - reduces BOM count by ≥4 components per channel while maintaining ±0.35 LSB linearity. | Use Scenario: Handheld oscilloscope or spectrum analyzer capturing transient waveforms at up to 400ksps with real-time FFT processing. IC Role / Device Role / Timing Role: High-speed data acquisition front-end with low aperture jitter (2ps RMS) and fast 4.0μs conversion time enabling accurate time-domain reconstruction. Use Value: Enables 12-bit ENOB >9.5 bits at 40kHz input frequency (S/(N+D) = 72.5dB), meeting Class II portable instrument specifications per IEC 61000-4-30. |
| Automated Test Systems | Medical Sensor Interfaces |
Use Scenario: Rack-mounted ATE platform performing parametric testing on mixed-signal ICs using multi-point voltage/current measurements. IC Role / Device Role / Timing Role: Precision ADC with scan mode cycling through 8 DUT pins while maintaining consistent gain and offset calibration across all channels. Use Value: Programmable sequencer ensures identical configuration per channel - removes software-induced timing skew and improves test repeatability by >0.1%. | Use Scenario: Patient-worn vital sign monitor acquiring ECG, SpO₂, and respiration signals with low-power, high-isolation analog front-end. IC Role / Device Role / Timing Role: Low-noise, low-power ADC operating from 3V supply with 3mW consumption - extends battery life while supporting 12-bit resolution for diagnostic-grade waveform fidelity. Use Value: Internal 2.5V reference (±15ppm/°C) and 60dB CMRR enable stable baseline tracking in noisy clinical environments without external trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar data acquisition applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1853IFW#TRPBF | Same 12-bit/400ksps spec, but –40°C to 85°C extended temperature grade - higher max junction temp (150°C) and wider VDD tolerance (2.7–5.5V unchanged). | Required for automotive under-hood or industrial outdoor deployments where ambient exceeds 70°C. | Select when operating temperature exceeds 70°C; otherwise LTC1853CFW#TRPBF offers cost advantage for commercial-grade systems. |
| AD7490BRUZ | 12-bit, 1MSPS SAR ADC with 16-channel mux, but no internal reference or programmable sequencer - requires external REF and host-controlled sequencing. | Suitable for high-throughput, host-managed acquisition where FPGA/microcontroller handles channel scheduling and calibration. | Choose AD7490BRUZ only if system already includes precision external reference and needs >400ksps throughput; LTC1853CFW#TRPBF integrates more functions for simpler designs. |
Compared with LTC1853IFW#TRPBF, the LTC1853CFW#TRPBF trades extended temperature range for lower cost in commercial environments; compared with AD7490BRUZ, it sacrifices raw speed for on-chip intelligence (sequencer, reference, buffer), reducing firmware complexity and external component count.
Availability
LTC1853CFW#TRPBF is available at Aetrix Electronics and suitable for industrial process control, portable test equipment, and automated test systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1853CFW#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 industrial, automotive, communications, and healthcare markets.
The LTC1853CFW#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for embedded systems requiring integrated multiplexing, low power, and deterministic timing without external support components.
FAQ
What is the maximum sampling rate of the LTC1853CFW#TRPBF and under what conditions?
The LTC1853CFW#TRPBF achieves a maximum sampling rate of 400ksps when operated with a 5V analog supply (VDD). At 2.7V supply, the maximum rate drops to 250ksps due to reduced internal clock speed and settling time constraints. This specification is guaranteed over the full 0°C to 70°C operating temperature range and applies to both single-ended and differential input configurations.
Does the LTC1853CFW#TRPBF require an external reference, or does it include an internal one?
The LTC1853CFW#TRPBF includes a fully integrated 2.5V internal reference with ±15ppm/°C temperature coefficient and 2.48V to 2.52V output tolerance. It also supports external reference operation via the REFIN and REFCOMP pins, allowing use of precision 2.048V, 2.5V, or 4.096V references. The internal reference eliminates BOM cost and board space for most commercial applications, while external options enable metrology-grade calibration.
How many analog input channels does the LTC1853CFW#TRPBF support, and what topologies are available?
The LTC1853CFW#TRPBF supports eight analog input channels (CH0–CH7) configurable as either eight single-ended inputs referenced to COM or four differential pairs (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7). Configuration is controlled by the DIFF pin, with COM automatically disabled in differential mode. Each channel supports unipolar or bipolar operation and two gain ranges (1× or 2×) selected via the PGA pin.
What power-saving modes does the LTC1853CFW#TRPBF offer, and how do they differ?
The LTC1853CFW#TRPBF offers two hardware-controlled power-down modes: Nap mode (SHDN low, CS low) draws 0.5mA and wakes in 200ns; Sleep mode (SHDN low, CS high) draws only 20μA but requires 10ms wake-up time. Both modes retain register contents and sequencer configuration. Nap mode suits burst-acquisition systems needing rapid response; Sleep mode targets ultra-low-power intermittent logging applications.
Is the LTC1853CFW#TRPBF pin-compatible with earlier Linear Technology ADCs?
Yes, the LTC1853CFW#TRPBF is pin-compatible with the LTC1851 (12-bit, 1.25Msps) and shares the same 48-lead TSSOP footprint and pinout mapping for all analog, power, and control signals. However, the higher-speed LTC1851 requires faster timing margins and lacks the LTC1853CFW#TRPBF's programmable sequencer readback capability - firmware must be verified for timing compliance before drop-in replacement.
LTC1853CFW#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):
- 400k
- 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:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- PGA, Selectable Address
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 48-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1853CFW#TRPBF FAQ
1.How can I place an order for LTC1853CFW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1853CFW#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 LTC1853CFW#TRPBF reliable?
The price and inventory of LTC1853CFW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1853CFW#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1853CFW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1853CFW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1853CFW#TRPBF?
LTC1853CFW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1853CFW#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 LTC1853CFW#TRPBF?
For technical support, including LTC1853CFW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1853CFW#TRPBF requirements.
6.How does Aetrix verify that LTC1853CFW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1853CFW#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 LTC1853CFW#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1853CFW#TRPBF?
All LTC1853CFW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1853CFW#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 LTC1853CFW#TRPBF part is unused and in its original packaging.
Return procedure for LTC1853CFW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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