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Analog Devices Inc. LTC1594IS#PBF
- Part No.:
- LTC1594IS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1594IS#PBF.pdf
- Description:
- IC ADC 12BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:126
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Product details
Overview
LTC1594IS#PBF from Analog Devices (formerly Linear Technology) is a micropower 12-bit serial-output analog-to-digital converter with integrated 4-channel analog multiplexer, single 5V supply operation, ±3/4 LSB max DNL, 16.8 ksps sampling rate, and auto-shutdown to 1 nA between conversions - used in battery-operated remote data acquisition systems requiring low-power, isolated signal digitization.
For engineers reviewing the LTC1594IS#PBF datasheet, LTC1594IS#PBF pinout, LTC1594IS#PBF application, or LTC1594IS#PBF equivalent, key selection considerations include its guaranteed 12-bit no-missing-codes performance, separate MUX/ADC control via CSMUX and CSADC, 1.5V–5V reference input range, high-impedance analog inputs enabling direct sensor interfacing, and SPI/MICROWIRE/QSPI-compatible 4-wire serial interface.
Technical Context
The LTC1594IS#PBF integrates a switched-capacitor successive-approximation ADC with on-chip sample-and-hold, a 4-channel analog multiplexer, and independent chip select lines (CSMUX and CSADC) allowing asynchronous channel selection and conversion triggering. Its architecture supports ratiometric measurement and operation with external references down to 1.5V full-scale.
It features break-before-make switching (35–160 ns tOPEN), 12-bit unipolar transfer curve, and dual power-down modes: partial shutdown during idle clock cycles (with CLK active) and full shutdown when CSADC is high. The device maintains ±3 LSB integral linearity and ±3/4 LSB differential linearity across its –40°C to +85°C industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - ensures monotonicity and full 4096-code output range for precision measurement. |
| Sampling Rate | 16.8 ksps maximum - enables real-time monitoring of signals up to ~8 kHz per Nyquist criterion. |
| Supply Current | 320 μA typical during conversion; drops to 1 nA in auto-shutdown - extends battery life in portable sensors. |
| DNL | ±3/4 LSB max - guarantees monotonic response and eliminates code ambiguities in closed-loop control. |
| Reference Range | 1.5 V to VCC + 0.05 V - supports low-voltage sensor outputs without external gain stages. |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive under-hood environments. |
| Interface | 4-wire SPI/MICROWIRE/QSPI-compatible serial - simplifies isolation barrier implementation with minimal GPIO count. |
Pinout & Package
Package: 16-pin narrow SO (SO-16), RoHS-compliant lead-free (PBF).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH3 (1–4) | Analog multiplexer inputs | Four single-ended analog channels selectable via 3-bit address; high-impedance (±200 nA leakage) for direct transducer connection. |
| ADCIN (5) | ADC positive input | Accepts conditioned signal from MUXOUT or external source; 1 μA max input leakage ensures minimal loading. |
| VREF (6) | Reference voltage input | Defines full-scale range; supports external references from 1.5 V to 5.5 V with 5 MΩ input resistance at CS = VIH. |
| COM (7) | ADC negative input / common-mode reference | Serves as analog ground reference for differential measurements; must be low-noise and tied to clean analog ground plane. |
| GND (8) | Analog ground | Primary analog return path; requires dedicated low-impedance connection to PCB analog ground plane. |
| CSADC (9) | ADC chip select | Active-low enable: powers down ADC and tristates DOUT when high; initiates conversion when pulled low. |
| VCC (10–11, 15–16) | Power supply | Single 4.5–5.5 V supply; multiple pins provide low-impedance routing and reduce trace inductance. |
| MUXOUT (12) | Multiplexer output | Drives ADCIN directly in standard configuration; enables insertion of external signal conditioning (e.g., PGA, filter) in MUXOUT→ADCIN loop. |
| CLK (13–14) | Serial clock input | Synchronizes both MUX addressing and ADC data transfer; supports up to 320 kHz clock frequency. |
| CSMUX (15) | MUX chip select | Active-low control for multiplexer channel selection; allows independent MUX setup prior to ADC conversion. |
| DIN (16) | Serial data input | Receives 4-bit channel address (EN + D2:D0); latched on rising CLK edge while CS is high. |
| DOUT (17) | Serial data output | Outputs 12-bit conversion result LSB-first; tri-stated when CSADC is high to support shared bus configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Auto shutdown to 1 nA | Eliminates standby power waste between conversions - critical for multi-year battery life in wireless sensor nodes. |
| Separate MUX and ADC controls | Enables pre-selection of analog channel before conversion start, reducing total system latency and supporting burst-mode sampling. |
| 1.5 V minimum reference span | Permits direct digitization of low-output sensors (e.g., thermocouples, RTDs with excitation) without gain amplification. |
| Break-before-make switching | Prevents channel crosstalk during multiplexer transitions - essential for accurate multi-sensor measurement integrity. |
| High-impedance analog inputs | Reduces need for buffer op-amps; allows direct connection to high-Z sources like piezoelectric sensors or pH electrodes. |
Applications
| Battery Monitoring | Remote Data Acquisition |
|---|---|
Use Scenario: Measuring cell voltages in multi-cell Li-ion battery packs deployed in off-grid solar inverters. IC Role / Device Role / Timing Role: 4-channel ADC sequentially samples individual cell voltages referenced to pack ground; uses COM pin for differential sensing against common-mode noise. Use Value: Enables precise state-of-charge estimation with <±3 LSB error over –40°C to +85°C, while drawing only 320 μA during sampling and 1 nA in sleep - extending maintenance intervals. | Use Scenario: Environmental sensor node collecting temperature, humidity, and pressure data in oil/gas pipeline monitoring. IC Role / Device Role / Timing Role: Digitizes analog outputs from four isolated transducers; operates behind digital isolator using 3-wire SPI (DIN/DOUT shared) to minimize component count. Use Value: Micropower operation allows operation from energy-harvested sources; 16.8 ksps sampling supports transient event capture without oversampling hardware. |
| Pen Screen Digitizing | Temperature Measurement |
Use Scenario: Resistive touch screen controller in handheld medical diagnostic devices requiring low EMI and long battery runtime. IC Role / Device Role / Timing Role: Samples X/Y electrode voltages via internal 4-channel MUX; uses MUXOUT→ADCIN loop to integrate anti-alias filtering without extra components. Use Value: Integrated MUX+ADC reduces BOM cost and PCB area; ±3/4 LSB DNL ensures linear touch coordinate mapping across full operating temperature range. | Use Scenario: Industrial oven temperature control using 4x PT100 RTD sensors with 2-wire configuration. IC Role / Device Role / Timing Role: Measures ratiometric voltage across each RTD using external current source and internal 1.5–5 V reference; COM pin serves as low-side sense reference. Use Value: 12-bit resolution yields ~0.025°C effective temperature resolution; 1.5 V min reference supports low-excitation currents to minimize self-heating errors. |
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 | Lacks multiplexer and 12-bit precision; suited for higher-speed, lower-resolution control loops | Select when speed > resolution and external MUX already exists in design |
| MAX11100ETE+ | 12-bit, 100 ksps, internal 2.048 V reference, 10-pin TDFN, no MUX | Higher speed but no analog multiplexer; fixed internal reference limits ratiometric flexibility | Choose when board space is constrained and external reference not required |
Compared with ADS7822U and MAX11100ETE+, the LTC1594IS#PBF uniquely combines 12-bit accuracy, integrated 4-channel MUX, ultra-low 1 nA shutdown current, and flexible reference support - making it optimal for space- and power-constrained multichannel sensor systems where channel count and precision are prioritized over raw throughput.
Availability
LTC1594IS#PBF is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition, isolated industrial sensing, and pen screen digitizing requiring stable component supply across extended temperature ranges.
Supply support for LTC1594IS#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1594IS#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered specifically for low-power, multichannel sensor interfacing in harsh environments where reliability, accuracy, and micropower operation are critical.
FAQ
What is the maximum clock frequency supported by the LTC1594IS#PBF?
The LTC1594IS#PBF supports a maximum clock frequency of 320 kHz, as specified in the recommended operating conditions. At this clock rate, the device achieves its full 16.8 ksps sampling rate with guaranteed timing margins. Exceeding 320 kHz may violate setup/hold times and degrade AC performance such as SNR and THD. The LTC1594IS#PBF datasheet specifies tWHCLK and tWLCLK minimums of 1 μs each, confirming the 320 kHz limit.
Does the LTC1594IS#PBF require an external reference voltage?
No, the LTC1594IS#PBF does not require an external reference voltage - it can operate ratiometrically using the VCC supply as reference, or accept an external reference from 1.5 V to VCC + 0.05 V on the VREF pin. When using VCC as reference, the full-scale range becomes VCC; when using an external reference, the device achieves improved accuracy and stability independent of supply variation. The LTC1594IS#PBF's RREF specification (5 MΩ at CS = VIH) confirms compatibility with high-impedance reference sources.
Can the LTC1594IS#PBF operate with a 3V supply?
No, the LTC1594IS#PBF is specified for 4.5 V to 5.5 V operation only. For 3V-compatible operation, Analog Devices offers the pin-compatible LTC1594LIS#PBF variant, which is explicitly characterized at 2.7 V to 3.6 V supply and shares identical functionality, package, and temperature range (–40°C to +85°C). The LTC1594IS#PBF datasheet states "These devices are specified at 5V. Consult factory for 3V specified devices (LTC1594L/LTC1598L)" - confirming that LTC1594IS#PBF itself is not rated for 3V use.
How does the break-before-make interval affect channel switching in the LTC1594IS#PBF?
The LTC1594IS#PBF implements a guaranteed 35–160 ns break-before-make interval (tOPEN) during multiplexer channel switching. This ensures all previously selected channels are fully disconnected before the newly addressed channel connects - preventing momentary short circuits, charge injection artifacts, or crosstalk-induced measurement errors. This behavior is critical when measuring high-impedance or floating sources, and is explicitly verified across the –40°C to +85°C operating range per the LTC1594IS#PBF datasheet.
Is the LTC1594IS#PBF compatible with standard SPI interfaces?
Yes, the LTC1594IS#PBF is fully compatible with standard SPI interfaces, including QSPI and MICROWIRE protocols. It uses a 4-wire synchronous half-duplex interface (CSADC/CSMUX, CLK, DIN, DOUT) with data sampled on the rising CLK edge and output on the falling edge. The LTC1594IS#PBF supports LSB-first transmission, 4-bit address input followed by 12-bit result output, and tri-state DOUT when CS is high - matching standard SPI master timing requirements without protocol translation.
LTC1594IS#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1594IS#PBF FAQ
1.How can I place an order for LTC1594IS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1594IS#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 LTC1594IS#PBF reliable?
The price and inventory of LTC1594IS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1594IS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1594IS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1594IS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1594IS#PBF?
LTC1594IS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1594IS#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 LTC1594IS#PBF?
For technical support, including LTC1594IS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1594IS#PBF requirements.
6.How does Aetrix verify that LTC1594IS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1594IS#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 LTC1594IS#PBF meets industry standards.
7.What is the process for return or replacement of LTC1594IS#PBF?
All LTC1594IS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1594IS#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 LTC1594IS#PBF part is unused and in its original packaging.
Return procedure for LTC1594IS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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