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Analog Devices Inc. LTC1853CFW#PBF
- Part No.:
- LTC1853CFW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
LTC1853CFW#PBF.pdf
- Description:
- IC ADC 12BIT SAR 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:178
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Product details
Overview
LTC1853CFW#PBF 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 digital 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#PBF datasheet, LTC1853CFW#PBF pinout, LTC1853CFW#PBF application, or LTC1853CFW#PBF equivalent, key selection considerations include its 12-bit resolution with ±0.35 LSB integral linearity, 400ksps sampling rate at 5V, 3mW power consumption at 250ksps/3V, and TSSOP-48 package compatibility with system-level timing and layout constraints.
Technical Context
The LTC1853CFW#PBF implements a capacitive successive approximation architecture with an internal sample-and-hold circuit, supporting full-scale input spans determined by REFCOMP voltage (e.g., ±2.048V bipolar, 0–4.096V unipolar). Its programmable sequencer stores up to 16 channel configurations and supports scan mode for automatic cycling across all 8 channels.
Digital interface uses separate OVDD (2.7–5.5V) and OGND supplies for 3V/5V logic compatibility, with parallel outputs including 12-bit conversion result plus 4-bit MUX address. Control logic responds to active-low CONVST, RD, WR, CS, and SHDN signals, with BUSY indicating conversion status and M0/M1 selecting operating modes including direct address, program, and readback.
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 at VDD = 5.5V - enables real-time capture of signals up to 200kHz Nyquist bandwidth. |
| Integral Linearity | ±0.35 LSB max over temperature - ensures <0.01% full-scale error in calibrated sensor interfaces. |
| Power Consumption | 10mW at 400ksps/5V; 3mW at 250ksps/3V - supports low-power portable instrumentation and battery-backed DAQ. |
| Analog Supply Range | 2.7V to 5.5V - allows direct operation from standard industrial rails without LDO regulation. |
| Digital I/O Supply | OVDD = 2.7V to 5.5V - enables seamless interfacing to mixed-voltage FPGA or microcontroller buses. |
| Reference Options | Internal 2.5V REFOUT (±15ppm/°C TC) or external 2.5V/4.096V on REFCOMP - simplifies calibration and reduces BOM count. |
Pinout & Package
Package: 48-lead plastic TSSOP (6.1mm wide), RoHS-compliant, 0°C to 70°C operating temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (1–8) | Analog Input Channels | Configurable as 8 single-ended or 4 differential pairs; COM pin serves as common reference in SE mode. |
| REFCOMP (12) | Reference Buffer Output | Sets full-scale span (e.g., 4.096V for ±2.048V bipolar); driven internally from REFIN or externally via 2.5V source. |
| D11–D0 (21,22,23,24–32) | Parallel Data Outputs | 12-bit conversion result + 4-bit MUX address; three-state, driven from OVDD/OGND for 3V/5V logic compatibility. |
| CONVST (45) | Conversion Start | Falling-edge triggered; initiates SAR cycle and resets internal logic - requires stable setup/hold per timing specs. |
| BUSY (33) | Conversion Status | Active-low open-drain output; falling edge marks start, rising edge indicates data validity for latch timing. |
| M0/M1 (36,48) | Mode Select Inputs | Define operating mode (Direct Address, Program, Readback); critical for sequencer configuration and register access. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable 16-step sequencer | Eliminates host processor overhead for repetitive multi-channel acquisition; sequence stored in on-chip memory. |
| Flexible analog input configuration | Single-ended/differential, unipolar/bipolar, and gain=1/gain=2 selectable per channel via DIFF, UNI/BIP, PGA pins. |
| Nap/Sleep shutdown modes | Reduces supply current to 0.5mA (Nap) or 20μA (Sleep) - extends battery life in intermittent-sampling applications. |
| Internal 2.5V reference with buffer | Provides stable 2.5V ±15ppm/°C output; eliminates need for external reference in cost-sensitive designs. |
| Parallel interface with MUX address | Outputs 12-bit data + 4-bit channel ID simultaneously - enables synchronized timestamping and channel-aware processing. |
Applications
| Industrial Process Monitoring | Automated Test Equipment |
|---|---|
|
Use Scenario: Continuous monitoring of 8 thermocouple, RTD, or pressure sensor outputs in PLC backplane modules. IC Role / Device Role / Timing Role: Central 12-bit ADC acquiring synchronized samples across multiple analog inputs with programmable gain and polarity. Use Value: ±0.35 LSB INL and 72.5dB SNR ensure sub-0.01% measurement accuracy across temperature, supporting ISO 50001 compliance. |
Use Scenario: High-speed functional testing of mixed-signal PCBs using pattern-based stimulus and response capture. IC Role / Device Role / Timing Role: Precision digitizer capturing transient waveforms from DUT outputs during boundary-scan or JTAG sequences. Use Value: 400ksps sampling with 2.5μs acquisition+conversion time enables 2.5μs per channel in 8-channel scan mode. |
| Portable Spectrum Analyzers | Medical Sensor Interfaces |
|
Use Scenario: Battery-powered handheld RF spectrum analyzer requiring undersampling of >1MHz IF signals with low distortion. IC Role / Device Role / Timing Role: Wideband ADC with –85dB SFDR and 2psRMS aperture jitter enabling clean spectral analysis beyond Nyquist. Use Value: Full-linear bandwidth supports >100kHz input frequencies while maintaining 11-bit ENOB (68dB S/(N+D)). |
Use Scenario: Multi-parameter patient monitor acquiring ECG, SpO₂, and respiration signals with isolated front-end amplifiers. IC Role / Device Role / Timing Role: Low-noise, low-power ADC interfacing to isolated analog signal chains via differential inputs and bipolar ranges. Use Value: 3mW power at 250ksps/3V and differential input support reduce thermal load and improve CMRR in safety-critical designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar data acquisition applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7490BRUZ | 12-bit, 1MSPS SAR ADC; 16-channel mux; no internal reference; SPI interface only. | Requires external reference and level-shifting for 3V logic; lacks parallel bus and sequencer memory. | Choose when higher speed and smaller footprint are prioritized over ease of interface and autonomous sequencing. |
| LTC1851CFW#PBF | 12-bit, 1.25Msps pin-compatible upgrade; identical pinout and feature set; higher sampling rate. | Same PCB layout but requires tighter timing margins on CONVST, RD, and BUSY signals. | Choose when system demands >400ksps throughput and timing budget allows faster control signal edges. |
Compared with AD7490BRUZ, LTC1853CFW#PBF offers integrated reference and parallel interface for simpler system integration; compared with LTC1851CFW#PBF, it trades speed for relaxed timing design and lower power at 400ksps - ideal for cost-optimized industrial DAQ where 1.25Msps is unnecessary.
Availability
LTC1853CFW#PBF is available at Aetrix Electronics and suitable for industrial process control, automated test equipment, and portable instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1853CFW#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC1853CFW#PBF belongs to Linear's precision data acquisition product line, designed specifically for low-power, multi-channel industrial and test equipment where integration, flexibility, and measurement integrity are critical.
FAQ
What is the maximum sampling rate of the LTC1853CFW#PBF and under what conditions?
The LTC1853CFW#PBF achieves a maximum sampling rate of 400ksps when VDD is 5.5V. At lower supply voltages (e.g., 2.7V), the maximum rate drops to 250ksps due to internal timing 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#PBF require an external reference, or does it include an internal one?
The LTC1853CFW#PBF includes an internal 2.5V reference with ±15ppm/°C temperature coefficient, accessible at the REFOUT pin. It also supports external references applied to REFCOMP (e.g., 2.5V or 4.096V), allowing users to select between internal simplicity and higher-precision external sources. The internal reference is fully functional without external components beyond recommended 1μF bypassing.
How many analog input channels does the LTC1853CFW#PBF support, and how are they configured?
The LTC1853CFW#PBF supports eight analog input channels (CH0–CH7), configurable either as eight single-ended inputs referenced to COM or as four differential pairs (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7). Configuration is controlled by the DIFF pin and MUX address inputs A2–A0, with additional flexibility provided by UNI/BIP and PGA pins for polarity and gain selection per channel.
What power-saving modes does the LTC1853CFW#PBF offer, and how much current do they draw?
The LTC1853CFW#PBF provides two low-power shutdown modes: Nap mode draws 0.5mA when SHDN = low and CS = low, while Sleep mode draws only 20μA when SHDN = low and CS = high. Both modes retain register settings and allow fast wake-up (200ns for Nap, 10ms for Sleep), making them suitable for duty-cycled data loggers and energy-harvesting systems.
Is the LTC1853CFW#PBF pin-compatible with any higher-speed alternatives in the same family?
Yes, the LTC1853CFW#PBF is pin-compatible with the LTC1851CFW#PBF, a 12-bit, 1.25Msps upgrade offering identical pinout, register map, and feature set. No PCB changes are required for migration; however, timing margins for CONVST, RD, and BUSY signals must be verified at the higher speed to ensure reliable operation.
LTC1853CFW#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):
- 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#PBF FAQ
1.How can I place an order for LTC1853CFW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1853CFW#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 LTC1853CFW#PBF reliable?
The price and inventory of LTC1853CFW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1853CFW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1853CFW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1853CFW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1853CFW#PBF?
LTC1853CFW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1853CFW#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 LTC1853CFW#PBF?
For technical support, including LTC1853CFW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1853CFW#PBF requirements.
6.How does Aetrix verify that LTC1853CFW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1853CFW#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 LTC1853CFW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1853CFW#PBF?
All LTC1853CFW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1853CFW#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 LTC1853CFW#PBF part is unused and in its original packaging.
Return procedure for LTC1853CFW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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