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Analog Devices Inc. LTC1594IS#TRPBF
- Part No.:
- LTC1594IS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1594IS#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,292
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Product details
Overview
LTC1594IS#TRPBF from Analog Devices (formerly Linear Technology) is a micropower 12-bit serial-output analog-to-digital converter with integrated 4-channel analog multiplexer, operating on a single 5V supply. It delivers ±3/4 LSB max DNL, 16.8 ksps sampling rate, and auto-shutdown to 1 nA between conversions. It is used in battery-operated remote data acquisition systems where low quiescent current and ratiometric sensor interfacing are critical.
For engineers reviewing the LTC1594IS#TRPBF datasheet, LTC1594IS#TRPBF pinout, LTC1594IS#TRPBF application, or LTC1594IS#TRPBF equivalent, key selection criteria include guaranteed 12-bit no-missing-codes performance, separate MUXOUT/ADCIN loop for external signal conditioning, SPI/MICROWIRE/QSPI-compatible 4-wire serial interface, and –40°C to +85°C industrial temperature rating.
Technical Context
The LTC1594IS#TRPBF integrates a switched-capacitor successive-approximation ADC with sample-and-hold, a 4-channel analog multiplexer, and independent chip-select control for MUX and ADC sections. Its architecture supports break-before-make channel switching with 35–160 ns tOPEN, enabling clean channel transitions without crosstalk-induced errors.
It operates with external reference (1.5 V to VCC + 0.05 V), accepts analog inputs from –0.05 V to VCC + 0.05 V, and features high-impedance analog inputs (±1 µA leakage at ADCIN). The serial interface uses falling-edge CLK for data output and rising-edge CLK for DIN latching, supporting half-duplex 3-wire operation when DIN/DOUT are tied.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - ensures monotonic transfer function across full scale. |
| Differential Nonlinearity | ±3/4 LSB max - guarantees monotonicity and supports precise linear measurements. |
| Sampling Rate | 16.8 ksps - enables real-time monitoring of fast-changing sensor signals (e.g., temperature transients). |
| Supply Current (Active) | 320 µA typical at 16.8 ksps - allows multi-year battery life in portable instrumentation. |
| Supply Current (Shutdown) | 1 nA typical - eliminates standby power drain in sleep-mode systems. |
| Analog Input Range | –0.05 V to VCC + 0.05 V - supports direct connection to transducers with small common-mode offsets. |
| Reference Input Range | 1.5 V to VCC + 0.05 V - enables reduced-span operation down to 1.5 V full-scale for 366 µV LSB resolution. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive under-hood environments. |
Pinout & Package
Package: 16-pin narrow SO (SO-16), JEDEC MS-012AC, 7.5 mm × 4.4 mm body, 1.27 mm pitch.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH3 (Pins 1–4) | Analog multiplexer inputs | Four single-ended analog input channels; selected via 3-bit address with EN bit. |
| ADCIN (Pin 5) | ADC positive analog input | Accepts conditioned signal from MUXOUT or external PGA; high-impedance (±1 µA leakage). |
| VREF (Pin 6) | External reference voltage input | Sets full-scale range; supports 1.5 V to 5.5 V references for flexible span configuration. |
| COM (Pin 7) | ADC negative analog input | Common-mode reference point; must be low-noise and tied to system analog ground. |
| GND (Pin 8) | Analog ground | Primary analog return path; requires dedicated low-impedance connection to PCB ground plane. |
| CSADC (Pin 9) | ADC chip select | Low enables conversion; high powers down ADC and tri-states DOUT - critical for power gating. |
| VCC (Pins 10, 15) | Power supply | Single 4.5 V–5.5 V supply; requires local 1 µF ceramic bypass to GND at each pin. |
| MUXOUT (Pin 16) | Multiplexer output | Drives ADCIN directly in standard configuration; enables external filtering or gain stages in MUXOUT/ADCIN loop. |
| CLK (Pin 11) | Serial clock input | Synchronizes both MUX addressing and ADC data output; supports up to 320 kHz clock frequency. |
| CSMUX (Pin 12) | MUX chip select | Controls multiplexer channel selection independently - enables channel pre-selection for burst sampling. |
| DIN (Pin 13) | Serial data input | Receives 4-bit channel address (EN + D2:D0); latched on rising CLK edge. |
| DOUT (Pin 14) | Serial data output | Outputs 12-bit conversion result LSB-first; tri-stated when CSADC = high. |
Key Features
| Feature | Design Value |
|---|---|
| Separate MUX and ADC chip selects | Enables pre-selection of analog channel before conversion start - reduces total cycle time in multi-sample sequences. |
| MUXOUT/ADCIN loop architecture | Allows insertion of external programmable gain amplifier or anti-alias filter between MUX and ADC - eliminates per-channel signal conditioning circuitry. |
| Break-before-make channel switching | Guarantees 35–160 ns isolation between channel disconnect and reconnect - prevents transient coupling during multiplexing. |
| 3-wire serial interface support | DIN and DOUT can share one MCU I/O line - reduces microcontroller pin count and simplifies isolation barrier design. |
| Ratiometric operation capability | Accepts reference derived from same supply as sensor excitation - cancels supply drift in bridge or RTD measurements. |
| Reduced-span operation (down to 1.5 V) | Delivers 366 µV LSB resolution at 1.5 V full-scale - improves effective resolution for low-output sensors without external amplification. |
Applications
| Battery Monitoring | Remote Industrial Sensor Node |
|---|---|
Use Scenario: Monitoring individual cell voltages in 4-cell Li-ion battery packs using resistive dividers. IC Role / Device Role / Timing Role: 12-bit ADC digitizes four cell voltages sequentially via internal 4-channel MUX; auto-shutdown minimizes quiescent current between readings. Use Value: 320 µA active current and 1 nA shutdown enable >5-year battery life in maintenance-free wireless BMS nodes. |
Use Scenario: Collecting temperature, pressure, and humidity data from distributed field sensors powered by energy harvesters. IC Role / Device Role / Timing Role: Acts as primary A/D front-end with external reference and ratiometric scaling; serial interface transmits data across opto-isolators. Use Value: 4-wire SPI compatibility and 16.8 ksps sampling support real-time trending while maintaining <10 µW average power consumption. |
| Pen Screen Digitizing | Isolated Data Acquisition Module |
Use Scenario: Converting analog X/Y coordinate signals from resistive touchscreens in handheld medical devices. IC Role / Device Role / Timing Role: Samples four analog inputs (X+, X–, Y+, Y–) with high-impedance inputs and low leakage (<200 nA off-channel) to preserve signal integrity. Use Value: ±3/4 LSB DNL ensures accurate position interpolation; MUXOUT/ADCIN loop accommodates on-chip RC filtering for noise suppression. |
Use Scenario: High-voltage industrial monitoring where analog inputs float at ±1 kV relative to system ground. IC Role / Device Role / Timing Role: ADC resides on isolated side; communicates via digital isolators using 3-wire serial mode to minimize isolation component count. Use Value: Low 320 µA supply current reduces isolated-side power budget; separate CSMUX/CSADC allows deterministic timing control across isolation barrier. |
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, 200 ksps, 2.7–5.25 V supply, no integrated MUX | Higher speed but lower resolution; requires external MUX for multi-channel use | Select when higher throughput outweighs resolution needs and external MUX is acceptable. |
| MAX11100ETE+ | 12-bit, 100 ksps, internal 2.048 V reference, 10-pin µMAX package | Integrated reference simplifies layout but lacks MUX and industrial temp grade (–40°C to +85°C) | Select for space-constrained designs where fixed reference suffices and channel count ≤1. |
Compared with ADS7822U and MAX11100ETE+, the LTC1594IS#TRPBF uniquely combines 12-bit accuracy, integrated 4-channel MUX, –40°C to +85°C rating, and 1 nA shutdown - making it optimal for multi-sensor battery-powered systems requiring long-term stability and minimal external components.
Availability
LTC1594IS#TRPBF is available at Aetrix Electronics and suitable for battery monitoring, remote industrial sensor nodes, pen screen digitizing, and isolated data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1594IS#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 LTC1594IS#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for ultra-low-power, multi-channel sensor interfacing in harsh industrial and portable environments.
FAQ
What is the maximum sampling rate of the LTC1594IS#TRPBF?
The LTC1594IS#TRPBF achieves a maximum sampling rate of 16.8 ksps under standard conditions (VCC = 5 V, fCLK = 320 kHz). This rate is maintained across its full –40°C to +85°C operating temperature range and is specified with guaranteed timing margins for reliable system-level timing closure.
Can the LTC1594IS#TRPBF operate with a 3V supply?
No, the LTC1594IS#TRPBF is specified for 4.5 V to 5.5 V operation only. For 3V-compatible variants, Analog Devices offers the LTC1594LIS#TRPBF, which is pin-compatible and functionally identical but rated for 2.7 V to 3.6 V supply - confirm part marking and datasheet revision before substitution.
Does the LTC1594IS#TRPBF support true differential input mode?
No, the LTC1594IS#TRPBF is unipolar-only and does not support true differential input. It accepts single-ended inputs referenced to COM, with analog input range from –0.05 V to VCC + 0.05 V. Differential measurements require external instrumentation amplifier or resistor network preceding ADCIN.
How does the MUXOUT/ADCIN loop improve signal conditioning efficiency?
The MUXOUT/ADCIN loop in the LTC1594IS#TRPBF allows a single external circuit (e.g., PGA or RC filter) to condition all four analog channels before digitization. This eliminates four parallel signal paths, reducing PCB area, component count, and matching errors - directly lowering BOM cost and improving measurement consistency across channels.
What is the purpose of separate CSMUX and CSADC pins on the LTC1594IS#TRPBF?
Separate CSMUX and CSADC pins allow independent control of multiplexer channel selection and ADC conversion initiation. This enables pre-selection of a channel (via CSMUX) followed by multiple rapid conversions (via CSADC toggling), achieving up to 20 ksps effective throughput - a key advantage over single-CS architectures in burst-sampling applications.
LTC1594IS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- microPOWER™
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1594IS#TRPBF FAQ
1.How can I place an order for LTC1594IS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1594IS#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 LTC1594IS#TRPBF reliable?
The price and inventory of LTC1594IS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1594IS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1594IS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1594IS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1594IS#TRPBF?
LTC1594IS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1594IS#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 LTC1594IS#TRPBF?
For technical support, including LTC1594IS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1594IS#TRPBF requirements.
6.How does Aetrix verify that LTC1594IS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1594IS#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 LTC1594IS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1594IS#TRPBF?
All LTC1594IS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1594IS#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 LTC1594IS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1594IS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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