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Analog Devices Inc. LTC1598LIG#PBF
- Part No.:
- LTC1598LIG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1598LIG#PBF.pdf
- Description:
- IC ADC 12BIT SAR 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,997
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Product details
Overview
LTC1598LIG#PBF from Analog Devices (formerly Linear Technology) is an 8-channel, 12-bit, micropower sampling ADC with integrated multiplexer and serial interface. It operates from a single 2.7V–3.6V supply, draws 160µA typical supply current at 10.5ksps, auto-shuts down to 1nA between conversions, and features separate MUX/ADC control via CSMUX and CSADC pins. It is used in battery-operated remote data acquisition systems requiring low-power, multi-sensor analog monitoring.
For engineers reviewing the LTC1598LIG#PBF datasheet, LTC1598LIG#PBF pinout, LTC1598LIG#PBF application, or LTC1598LIG#PBF equivalent, key selection considerations include guaranteed ±3/4 LSB DNL, 2.7V minimum operation, 8-channel MUX with break-before-make switching, SPI/MICROWIRE-compatible 4-wire serial interface, and support for ratiometric or external reference configurations.
Technical Context
The LTC1598LIG#PBF integrates an 8-channel analog multiplexer, a 12-bit switched-capacitor successive-approximation ADC, sample-and-hold, and a synchronous half-duplex serial port. Its dual chip select architecture (CSMUX and CSADC) enables independent control of channel selection and conversion timing - allowing one-time channel setup followed by multiple conversions at up to 20ksps.
It supports unipolar transfer characteristics with 12-bit resolution over 0V to VREF input range, accepts external references from 1.5V to VCC + 0.05V, and provides high-impedance analog inputs (≤1µA leakage) suitable for direct sensor interfacing without gain stages. The MUXOUT/ADCIN loop enables external signal conditioning such as PGA or antialias filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - delivers 4096 discrete output levels for precise sensor digitization. |
| Sampling Rate | 10.5ksps maximum - supports real-time monitoring of slow-to-moderate dynamic signals like temperature or battery voltage. |
| Supply Current | 160µA typ at 10.5ksps; drops to 1nA in auto-shutdown - enables multi-year operation on coin-cell batteries. |
| Differential Nonlinearity | ±3/4 LSB max - ensures monotonic response critical for closed-loop control and precision measurement. |
| Reference Range | 1.5V to VCC + 0.05V - allows use of low-voltage references (e.g., 1.5V, 2.048V, 2.5V) while maintaining full-scale accuracy. |
| 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 compatible - enables direct connection to microcontrollers without level-shifting or protocol translation. |
Pinout & Package
The LTC1598LIG#PBF is housed in a 24-pin plastic SSOP (Small Outline Plastic Package) with 0.635mm lead pitch, rated for –40°C to +85°C operation (Industrial grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 20–24, 1–3) | Analog multiplexer inputs | Eight independent analog input channels; selected via 3-bit address on DIN with EN bit. |
| MUXOUT (Pin 18) | Multiplexer output | Drives selected channel to ADCIN; forms external loop for PGA or filter insertion before conversion. |
| ADCIN (Pin 17) | ADC positive input | Accepts conditioned signal from MUXOUT; high-impedance input minimizes loading on external circuitry. |
| COM (Pin 8) | ADC negative input / common-mode reference | Defines differential reference point; must be low-noise and tied to clean analog ground or sensor return. |
| VREF (Pin 16) | Reference voltage input | Sets full-scale range; supports external references or ratiometric operation using supply voltage. |
| CSMUX (Pins 6, 13) | Multiplexer chip select | Enables MUX address latching on rising edge; logic high permits DIN data capture, low connects selected channel to MUXOUT. |
| CSADC (Pin 10) | ADC chip select | Triggers sampling and conversion when pulled low; powers down ADC and tristates DOUT when high. |
| CLK (Pins 5, 12, 14) | Serial clock input | Synchronizes all data transfers; determines conversion speed (tCONV = 12 CLK cycles); must be ≥200kHz at 85°C. |
| DIN (Pins 7, 14) | Serial data input | Receives 4-bit channel address (EN + D2:D0); DIN and DOUT may be tied together for 3-wire operation. |
| DOUT (Pin 11) | Serial data output | Shifts out 12-bit conversion result LSB-first after null bit; tri-stated when CSADC is high. |
| VCC (Pins 11, 15, 19) | Power supply | Single 2.7V–3.6V supply; requires local 1µF bypassing to GND for stable reference and analog performance. |
| GND (Pins 4, 9) | Analog ground | Must connect directly to low-impedance analog ground plane; separates noise-sensitive analog circuitry from digital paths. |
Key Features
| Feature | Design Value |
|---|---|
| Separate MUX and ADC control | Independent CSMUX and CSADC pins enable one-time channel selection followed by burst conversions - increasing effective throughput to 20ksps. |
| Break-before-make switching | tOPEN = 125–350ns ensures no channel shorting during multiplexer transitions - prevents cross-talk and transient injection into sensitive sensors. |
| MUXOUT/ADCIN signal conditioning loop | Allows insertion of external PGA or RC antialias filter between multiplexer and ADC - eliminates per-channel amplification hardware. |
| Ratiometric or external reference support | Operates with VREF from 1.5V to VCC + 0.05V - supports both supply-referenced sensors and precision external references for absolute accuracy. |
| 3-wire serial interface option | DIN and DOUT can be wired together with bidirectional MCU I/O - reduces PCB routing complexity and pin count in space-constrained designs. |
Applications
| Battery Monitoring | Remote Sensor Networks |
|---|---|
|
Use Scenario: Monitoring individual cell voltages in multi-cell Li-ion battery packs for state-of-charge estimation and balancing control. IC Role / Device Role / Timing Role: 8-channel ADC samples up to eight cell voltages sequentially with 12-bit resolution and ±3/4 LSB DNL, enabling accurate voltage differentials across cells. Use Value: Low 160µA active current and 1nA shutdown current extend battery life in always-on monitoring systems; 2.7V minimum operation supports degraded battery conditions. |
Use Scenario: Collecting temperature, humidity, and pressure data from distributed environmental sensors powered by solar-charged batteries. IC Role / Device Role / Timing Role: Interfaces eight analog sensor outputs via internal MUX; performs synchronized sampling at 10.5ksps with SPI-compatible serial output for wireless transmission. Use Value: Micropower operation enables years of field deployment; MUXOUT/ADCIN loop allows shared antialias filtering, reducing BOM cost and board area. |
| Isolated Data Acquisition | Pen Screen Digitizing |
|
Use Scenario: High-voltage industrial equipment monitoring where analog inputs are galvanically isolated using optocouplers or digital isolators. IC Role / Device Role / Timing Role: ADC resides on isolated side; receives channel addresses and clocks across isolation barrier, returns digitized results via same path. Use Value: 4-wire serial interface simplifies isolation design; low power minimizes heat generation on isolated side; 1nA shutdown eliminates standby leakage across barrier. |
Use Scenario: Converting analog X/Y coordinate signals from resistive touchscreens into digital position data for embedded controllers. IC Role / Device Role / Timing Role: Samples four analog inputs (X+, X−, Y+, Y−) in rapid sequence using 4-channel subset of its 8-channel MUX, supporting fast pen tracking. Use Value: Break-before-make switching prevents coordinate ghosting; high-impedance inputs avoid loading touchscreen resistance network; 12-bit resolution enables sub-millimeter positioning accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-channel, 12-bit, micropower ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-channel, 12-bit, SPI interface, but only 2.7V–5.25V supply; no separate MUX/ADC controls; 1.25mW typical power at 100ksps (vs 0.33mW for LTC1598LIG#PBF at 10.5ksps). | Higher power draw limits battery life; lacks break-before-make and MUXOUT/ADCIN loop for external conditioning. | Select LTC1598LIG#PBF when ultra-low power, flexible signal conditioning, or robust multiplexer sequencing is required. |
| MAX11131ETE+ | 8-channel, 12-bit, SPI, 2.7V–3.6V supply; 1.5µA shutdown current (vs 1nA); no separate CSMUX/CSADC; fixed 100ksps sampling rate (not scalable). | Higher shutdown current increases long-term leakage; fixed sample rate reduces flexibility in adaptive sensing schemes. | Select LTC1598LIG#PBF for applications demanding nanowatt-level shutdown or variable sampling rates from 0.1ksps to 10.5ksps. |
Compared with ADS7822U and MAX11131ETE+, the LTC1598LIG#PBF uniquely combines 1nA shutdown, break-before-make multiplexing, and a configurable MUXOUT/ADCIN loop - making it optimal for energy-constrained, multi-sensor systems requiring precision, flexibility, and minimal external components.
Availability
LTC1598LIG#PBF is available at Aetrix Electronics and suitable for battery monitoring, remote sensor networks, isolated data acquisition, and pen screen digitizing requiring stable component supply and long-term industrial-grade availability.
Supply support for LTC1598LIG#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, formed through the acquisition of Linear Technology in 2017.
The LTC1598LIG#PBF belongs to Linear's legacy micropower precision ADC family, designed specifically for ultra-low-power, multi-channel data acquisition in portable and remote instrumentation where battery life and signal integrity are critical.
FAQ
What is the operating temperature range for the LTC1598LIG#PBF?
The LTC1598LIG#PBF is specified for industrial operation from –40°C to +85°C. This rating is confirmed by the "LIG" suffix in the part number and verified in the Absolute Maximum Ratings table, where LTC1598LIG denotes the –40°C to +85°C grade. The device maintains full performance across this range, including guaranteed ±3/4 LSB DNL and 10.5ksps sampling capability at 85°C when fCLK ≥ 200kHz.
Can the LTC1598LIG#PBF operate with a 2.5V external reference?
Yes, the LTC1598LIG#PBF fully supports a 2.5V external reference applied to the VREF pin. The datasheet specifies a reference input range of 1.5V to VCC + 0.05V, and with VCC = 3V, 2.5V falls well within that window. Using a precision 2.5V reference enables absolute measurement accuracy independent of supply variation, and the device guarantees 12-bit linearity and ±3/4 LSB DNL under this condition.
How does the break-before-make interval benefit system design?
The LTC1598LIG#PBF implements a guaranteed 125–350ns break-before-make interval (tOPEN) during multiplexer channel switching. This prevents momentary shorting between channels - eliminating crosstalk, transient injection, and erroneous readings when sampling high-impedance or isolated sensors. In practice, this allows reliable simultaneous monitoring of diverse signal sources (e.g., thermocouples and RTDs) without additional guarding or sequencing logic.
Is the LTC1598LIG#PBF pin-compatible with the LTC1594LIG#PBF?
No, the LTC1598LIG#PBF is not pin-compatible with the LTC1594LIG#PBF. The LTC1594LIG#PBF uses a 16-pin SO package with 4 analog inputs, while the LTC1598LIG#PBF uses a 24-pin SSOP package with 8 analog inputs and additional pins for extended functionality (e.g., dual CLK/CSMUX connections). Their pinouts, package footprints, and signal assignments differ fundamentally - requiring separate PCB layouts.
What is the minimum clock frequency required for accurate conversion?
The minimum clock frequency for the LTC1598LIG#PBF depends on temperature: 1kHz at 25°C, 75kHz at 70°C, and 200kHz at 85°C. This requirement is driven by increased channel leakage at elevated temperatures, which causes sample-and-hold droop. At 25°C, operation down to 1kHz enables ultra-low-power sampling at rates as low as ~83sps (tCYC ≥ 760µs), preserving the 12-bit accuracy specification.
LTC1598LIG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- microPOWER™
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 16.8k
- Number of Inputs:
- 8
- 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:
- 24-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1598LIG#PBF FAQ
1.How can I place an order for LTC1598LIG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1598LIG#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 LTC1598LIG#PBF reliable?
The price and inventory of LTC1598LIG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1598LIG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1598LIG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1598LIG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1598LIG#PBF?
LTC1598LIG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1598LIG#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 LTC1598LIG#PBF?
For technical support, including LTC1598LIG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1598LIG#PBF requirements.
6.How does Aetrix verify that LTC1598LIG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1598LIG#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 LTC1598LIG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1598LIG#PBF?
All LTC1598LIG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1598LIG#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 LTC1598LIG#PBF part is unused and in its original packaging.
Return procedure for LTC1598LIG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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