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Analog Devices Inc. LTC1594LCS#PBF
- Part No.:
- LTC1594LCS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1594LCS#PBF.pdf
- Description:
- IC ADC 12BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,704
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Product details
Overview
LTC1594LCS#PBF from Analog Devices (formerly Linear Technology) is a 3V, 12-bit, 4-channel micropower sampling ADC with integrated multiplexer and serial interface. It delivers 12-bit resolution at 10.5ksps, draws only 160µA during conversion, auto-shuts down to 1nA between samples, and operates from 2.7V to 3.6V. It is used in battery-powered sensor monitoring systems where low quiescent current and direct sensor interfacing are critical.
For engineers reviewing the LTC1594LCS#PBF datasheet, LTC1594LCS#PBF pinout, LTC1594LCS#PBF application, or LTC1594LCS#PBF equivalent, key selection criteria include guaranteed ±3/4 LSB DNL, 2.7V minimum supply operation, SPI/MICROWIRE/QSPI-compatible 4-wire serial interface, separate MUX/ADC chip selects for flexible timing control, and ratiometric capability with external reference support.
Technical Context
The LTC1594LCS#PBF integrates a 12-bit switched-capacitor successive-approximation ADC, a 4-channel analog multiplexer, sample-and-hold circuitry, and a synchronous half-duplex serial port. Its architecture enables independent control of multiplexer channel selection and ADC conversion via CSMUX and CSADC pins, supporting break-before-make switching and multi-conversion sequences without readdressing.
It supports unipolar transfer characteristics with a fixed 0V–VREF input range, accepts external references from 1.5V to VCC + 0.05V, and features high-impedance analog inputs (≤1µA leakage) enabling direct connection to transducers. The MUXOUT/ADCIN loop allows external signal conditioning-e.g., PGA or antialias filtering-shared across all channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - ensures monotonicity and full-scale linearity for precision measurement applications. |
| Sampling Rate | 10.5ksps maximum - supports real-time acquisition of signals up to ~5kHz Nyquist bandwidth. |
| Supply Current | 160µA typ during conversion; 1nA typ in auto-shutdown - enables multi-year battery life in remote sensing nodes. |
| Differential Nonlinearity | ±3/4 LSB max - guarantees monotonic response and eliminates code ambiguity in closed-loop control feedback. |
| Reference Input Range | 1.5V to VCC + 0.05V - permits use of low-voltage references (e.g., 1.5V, 2.048V, 2.5V) while maintaining full 12-bit resolution. |
| Analog Input Range | –0.05V to VCC + 0.05V - accommodates small negative offsets and rail-to-rail sensor outputs without clamping diodes. |
| Serial Interface | 4-wire SPI/MICROWIRE/QSPI-compatible - interoperates with common microcontrollers without protocol translation. |
Pinout & Package
Package: 16-pin narrow SO (SO-16), RoHS-compliant, lead-free (Pb-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH3 (Pins 1–4) | Analog multiplexer inputs | Four single-ended analog input channels selectable via 3-bit address; high-impedance (≤200nA off-leakage) for minimal loading. |
| ADCIN (Pin 5) | ADC positive input | Accepts conditioned signal from MUXOUT or external source; tied directly to MUXOUT for standard operation. |
| VREF (Pin 6) | Reference voltage input | Defines full-scale range; supports external references as low as 1.5V; input impedance >2.7MΩ when CS high. |
| COM (Pin 7) | ADC negative input / common-mode reference | Single-ended reference point for all channels; must be low-noise and stable relative to GND. |
| GND (Pin 8) | Analog ground | Primary analog return path; requires dedicated low-impedance connection to system analog ground plane. |
| CSADC (Pin 9) | ADC chip select | Active-low enable for ADC conversion; powers down ADC and tri-states DOUT when high. |
| CSMUX (Pin 10) | MUX chip select | Active-low enable for multiplexer channel selection; used independently or paralleled with CSADC. |
| CLK (Pin 11) | Serial clock input | Synchronizes DIN data capture (rising edge) and DOUT data output (falling edge); supports up to 200kHz. |
| DIN (Pin 12) | Serial data input | Receives 4-bit channel address (EN + D2:D0); compatible with 3-wire operation when tied to DOUT. |
| DOUT (Pin 13) | Serial data output | Outputs 12-bit conversion result LSB-first; enters high-impedance state when CSADC is high. |
| VCC (Pins 14–16) | Power supply | 3V nominal (2.7V–3.6V); requires local 1µF bypass capacitor to GND; Pins 14–16 internally connected. |
Key Features
| Feature | Design Value |
|---|---|
| Separate MUX and ADC chip selects | Enables channel selection once followed by multiple conversions - reduces CPU overhead and increases effective throughput to 20ksps. |
| MUXOUT/ADCIN loop | Allows shared external signal conditioning (e.g., gain, filtering) across all 4 channels - cuts BOM cost and PCB area vs per-channel circuits. |
| Ratiometric operation support | Accepts reference derived from same supply as sensors - eliminates drift errors in bridge-based or resistive sensor measurements. |
| Reduced full-scale span down to 1.5V | Delivers 366µV LSB resolution even with low-voltage references - ideal for low-output transducers (e.g., thermocouples, RTDs). |
| Break-before-make channel switching | Guarantees 125ns–350ns isolation between channels - prevents crosstalk and transient coupling during multiplexing. |
Applications
| Battery Monitoring | Remote Data Acquisition |
|---|---|
|
Use Scenario: Measuring individual cell voltages in multi-cell Li-ion battery packs for state-of-charge estimation and balancing control. IC Role / Device Role / Timing Role: 4-channel ADC sequentially samples each cell's voltage referenced to pack ground, using COM as common node and VREF set to 2.5V for 0.61mV resolution. Use Value: 160µA active current and 1nA shutdown extend battery runtime; 12-bit accuracy ensures <±5mV cell voltage error over temperature. |
Use Scenario: Wireless environmental sensor node collecting temperature, humidity, and pressure from discrete analog sensors. IC Role / Device Role / Timing Role: Interfaces four passive sensors via CH0–CH3, uses external 1.5V reference to maximize dynamic range for low-output transducers. Use Value: Micropower operation enables >5-year coin-cell life; SPI compatibility simplifies MCU firmware integration and reduces GPIO count. |
| Pen Screen Digitizing | Isolated Data Acquisition |
|
Use Scenario: Resistive touchscreen controller measuring X/Y electrode voltages in handheld devices. IC Role / Device Role / Timing Role: Samples four analog electrodes (X+, X−, Y+, Y−) using internal MUX; COM tied to driven electrode for ratiometric rejection of supply variation. Use Value: 10.5ksps sampling captures fast stylus motion; 4-wire interface minimizes isolation barrier component count in space-constrained designs. |
Use Scenario: Industrial field transmitter acquiring sensor data across galvanic isolation barrier (e.g., optocoupler or digital isolator). IC Role / Device Role / Timing Role: ADC resides on sensor side; serial data transmitted across isolator using CLK, CS, and bidirectional DATA (DIN/DOUT tied). Use Value: 3-wire serial mode reduces isolator channel count; 1nA shutdown current prevents leakage-induced offset in high-impedance isolated paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit micropower SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200ksps, 2.7V–5.25V supply, SPI-only interface, no integrated MUX. | Higher speed but lower resolution; requires external MUX for multi-channel use; lacks auto-shutdown below 1µA. | Select when higher throughput and wider supply range outweigh resolution and power needs. |
| MAX11100ETE+ | 12-bit, 100ksps, 2.7V–3.6V, internal 2.048V reference, 8-channel MUX, SPI interface. | Higher sampling rate and integrated reference simplify design; larger 16-pin TQFN package; no separate CSMUX/CSADC control. | Select when faster sampling and reference integration are prioritized over ultra-low shutdown current and flexible timing control. |
Compared with ADS7822U and MAX11100ETE+, the LTC1594LCS#PBF uniquely combines guaranteed ±3/4 LSB DNL, true 1nA shutdown, and independent MUX/ADC chip selects - making it optimal for ultra-low-power, precision, multi-cycle acquisition systems where timing flexibility and long-term stability are critical.
Availability
LTC1594LCS#PBF is available at Aetrix Electronics and suitable for battery monitoring, remote data acquisition, pen screen digitizing, and isolated data acquisition requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC1594LCS#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 LTC1594LCS#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for ultra-low-power, high-resolution sensor interface applications in portable and remote instrumentation.
FAQ
What is the minimum operating supply voltage for the LTC1594LCS#PBF?
The LTC1594LCS#PBF is guaranteed to operate down to 2.7V across its full temperature range (0°C to 70°C for the CS grade). Below 2.7V, functionality is not assured - for example, reference input range shrinks and DNL may exceed ±3/4 LSB. Operation at 2.7V enables compatibility with aging lithium batteries and low-dropout regulators.
Can the LTC1594LCS#PBF interface with a 3-wire SPI bus?
Yes, the LTC1594LCS#PBF supports 3-wire SPI operation by tying DIN and DOUT together. During communication, the device takes control of the shared data line after CS falls and before the 6th falling CLK edge, while the host MCU releases it when CS is high. This configuration reduces isolation component count and saves MCU GPIOs.
Does the LTC1594LCS#PBF require an external reference, or does it have an internal one?
The LTC1594LCS#PBF has no internal reference and requires an external reference applied to the VREF pin. It accepts references from 1.5V to VCC + 0.05V, enabling ratiometric operation with sensor excitation supplies or precision low-drift references like REF192 or LT1019.
How does the break-before-make interval affect channel switching in the LTC1594LCS#PBF?
The LTC1594LCS#PBF guarantees a 125ns–350ns break-before-make interval (tOPEN) between channel switches. This ensures all channels are fully disconnected before the next is enabled - preventing transient coupling, crosstalk, or short-circuits in high-impedance sensor networks and protecting sensitive analog front-ends.
What is the purpose of the separate CSMUX and CSADC pins on the LTC1594LCS#PBF?
The separate CSMUX and CSADC pins allow independent control of multiplexer channel selection and ADC conversion timing. This enables advanced sequencing - such as selecting a channel once and performing multiple conversions - increasing effective sampling rate to 20ksps and reducing host processor overhead compared to monolithic chip-select architectures.
LTC1594LCS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- microPOWER™
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 16.8k
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1594LCS#PBF FAQ
1.How can I place an order for LTC1594LCS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1594LCS#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 LTC1594LCS#PBF reliable?
The price and inventory of LTC1594LCS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1594LCS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1594LCS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1594LCS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1594LCS#PBF?
LTC1594LCS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1594LCS#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 LTC1594LCS#PBF?
For technical support, including LTC1594LCS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1594LCS#PBF requirements.
6.How does Aetrix verify that LTC1594LCS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1594LCS#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 LTC1594LCS#PBF meets industry standards.
7.What is the process for return or replacement of LTC1594LCS#PBF?
All LTC1594LCS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1594LCS#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 LTC1594LCS#PBF part is unused and in its original packaging.
Return procedure for LTC1594LCS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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