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Analog Devices Inc. LTC1594CS#PBF
- Part No.:
- LTC1594CS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1594CS#PBF.pdf
- Description:
- IC ADC 12BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LTC1594CS#PBF from Analog Devices (formerly Linear Technology) is a 4-channel, 12-bit micropower sampling ADC with integrated multiplexer and serial interface. It operates on a single 5V supply, draws only 320μA during conversion at 16.8ksps, and auto-shuts down to 1nA between conversions. Its high-impedance analog inputs (±200nA leakage), ±3/4LSB max DNL, and ability to accept 1.5V–5V reference enable direct sensor interfacing in battery-powered data acquisition systems.
For engineers reviewing the LTC1594CS#PBF datasheet, LTC1594CS#PBF pinout, LTC1594CS#PBF application, or LTC1594CS#PBF equivalent, key selection criteria include its 4-channel MUX architecture, guaranteed unipolar transfer curve, SPI/MICROWIRE-compatible 4-wire serial interface, and SO-16 package compatibility with isolated or remote sensing layouts requiring low quiescent power and ratiometric operation.
Technical Context
The LTC1594CS#PBF integrates a switched-capacitor successive-approximation ADC with a dedicated 4-channel analog multiplexer, separate MUXOUT and ADCIN pins for external signal conditioning, and independent chip selects (CSMUX and CSADC) enabling flexible channel selection timing. Its sample-and-hold acquisition time is 1.5 clock cycles, and conversion completes in 12 clock cycles at 320kHz.
It supports ratiometric measurement via external reference (1.5V–5.5V), accepts analog inputs from –0.05V to VCC+0.05V, and features break-before-make switching (35–160ns) to prevent channel crosstalk. Digital I/O is compatible with QSPI, SPI, and MICROWIRE protocols using falling-edge data capture and rising-edge sampling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - ensures monotonicity and full-scale linearity across all 4096 codes. |
| Sampling Rate | 16.8ksps maximum - enables real-time monitoring of fast-changing sensor signals without aliasing at Nyquist. |
| DNL Error | ±3/4 LSB max - guarantees monotonic response and prevents code skipping in precision measurement. |
| Supply Current | 320μA typ during conversion; 1nA in auto-shutdown - supports multi-year battery life in portable instrumentation. |
| Reference Range | 1.5V to VCC + 0.05V - allows use of low-voltage references or direct ratiometric connection to sensor excitation. |
| Analog Input Leakage | ±200nA off-channel - minimizes crosstalk and offset drift when multiplexing high-impedance sources like thermistors. |
| Serial Interface | 4-wire synchronous half-duplex - supports DIN/DOUT wire sharing to reduce PCB routing complexity and isolation barrier count. |
Pinout & Package
Package: 16-pin narrow SO (SO-16), 150 mil width, surface-mount. Pin pitch: 1.27mm. Thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH3 (Pins 1–4) | Analog multiplexer inputs | Accept 0V–5V differential signals relative to COM; high-impedance inputs eliminate need for buffer amplifiers in many sensor interfaces. |
| ADCIN (Pin 5) | ADC positive input | Connects to MUXOUT for standard operation; also accepts external conditioned signals for PGA or filter insertion in MUXOUT/ADCIN loop. |
| VREF (Pin 6) | Reference voltage input | Defines full-scale range; supports 1.5V–5.5V externally applied reference for ratiometric or absolute measurement modes. |
| COM (Pin 7) | Negative analog input | Serves as common-mode reference for all channels; must be low-noise and tied directly to analog ground plane. |
| GND (Pin 8) | Analog ground | Primary return path for analog circuitry; requires dedicated low-impedance connection to system AGND. |
| CSADC (Pin 9) | ADC chip select | Active-low control that powers up ADC core and enables conversion; tied to CSMUX for synchronized operation. |
| VCC (Pins 10, 15, 16) | Power supply | 5V ±10% supply; multiple pins provide low-impedance path and require local 1μF bypass to GND. |
| MUXOUT (Pin 18) | Multiplexer output | Drives ADCIN directly; enables external gain/filter stages between MUX and ADC without per-channel components. |
| CLK (Pin 14) | Serial clock input | 320kHz typical clock; determines conversion speed and data rate; rising edge captures DIN, falling edge outputs DOUT. |
| DIN (Pin 13) | Serial data input | Receives 4-bit channel address (EN + D2:D0); supports daisy-chaining or shared bus with tri-state control. |
| DOUT (Pin 11) | Serial data output | Outputs 12-bit LSB-first conversion result after null bit; three-states when CSADC is high. |
| CSMUX (Pin 12) | MUX chip select | Active-low control for multiplexer addressing; used independently to pre-select channel before CSADC activation. |
Key Features
| Feature | Design Value |
|---|---|
| Auto shutdown to 1nA | Eliminates need for external power gating logic and reduces average system current in intermittent-sampling applications. |
| Separate MUX and ADC controls | Enables channel pre-selection and overlapping operations, increasing effective throughput to 20ksps in optimized timing sequences. |
| Break-before-make switching | Prevents transient short-circuits between channels during switching, preserving signal integrity in high-precision DC measurements. |
| MUXOUT/ADCIN loop | Allows insertion of single external PGA or anti-alias filter for all four channels-reducing BOM cost and board area vs. per-channel solutions. |
| 1.5V minimum reference support | Permits use of low-power references or direct connection to 1.8V/2.5V microcontroller I/O rails for ratiometric sensor scaling. |
Applications
| Battery Monitoring | Remote Data Acquisition |
|---|---|
Use Scenario: Measuring individual cell voltages in multi-cell Li-ion packs with minimal self-discharge impact. IC Role / Device Role / Timing Role: 4-channel ADC samples each cell sequentially using internal MUX; auto-shutdown preserves battery life between readings. Use Value: 320μA active current and 1nA shutdown enable >5-year battery life in wireless BMS nodes operating at 1Hz sampling. | Use Scenario: Environmental sensor node deployed in inaccessible locations, transmitting data over RF or optical isolation barrier. IC Role / Device Role / Timing Role: ADC digitizes temperature, humidity, and pressure sensors; serial interface transmits data across isolation boundary using only 3 wires (CS, CLK, DATA). Use Value: Micropower operation and 4-wire SPI compatibility allow full functionality through optocouplers or digital isolators without auxiliary power on the sensor side. |
| Pen Screen Digitizing | Temperature Measurement |
Use Scenario: Resistive touch screen controller measuring X/Y electrode voltages in handheld devices. IC Role / Device Role / Timing Role: 4-channel MUX scans X+ X− Y+ Y− electrodes; unipolar transfer curve matches resistive divider output range. Use Value: Guaranteed monotonicity (±3/4LSB DNL) prevents coordinate jump artifacts; high-Z inputs avoid loading thin-film traces. | Use Scenario: Industrial RTD or thermistor readout in programmable logic controllers with limited thermal budget. IC Role / Device Role / Timing Role: ADC interfaces directly to 2-/3-wire RTD bridges; COM pin serves as Kelvin sense reference for lead compensation. Use Value: ±200nA off-channel leakage and 1.5V reference support enable sub-0.1°C accuracy without external op-amps or reference buffers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel, 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | Single-supply 5V operation, 200kSPS, no integrated MUX, SPI-only interface | Requires external analog switch for multi-channel use; higher speed but no auto-shutdown (1.2mA typical) | Select when higher throughput is critical and external MUX is acceptable; not drop-in due to missing MUX and different pinout. |
| MAX11100ETE+ | 12-bit, 500kSPS, integrated 8-channel MUX, 2.7–3.6V supply only | Lower voltage operation limits compatibility with 5V sensor outputs; higher speed but 1.5mA active current | Select for 3.3V systems needing more channels; incompatible with 5V supply or legacy 5V sensor interfaces. |
Compared with ADS7822U and MAX11100ETE+, the LTC1594CS#PBF uniquely combines 4-channel integration, 1nA shutdown, and 5V compatibility-making it optimal for ultra-low-power, space-constrained 5V sensor hubs where channel count and quiescent current dominate selection.
Availability
LTC1594CS#PBF is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition nodes, and pen screen digitizing applications requiring stable component supply and long-term industrial availability.
Supply support for LTC1594CS#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 by the acquisition of Linear Technology in 2017.
The LTC1594CS#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for ultra-low-power, multi-channel sensor interfacing in portable, isolated, and energy-constrained embedded systems.
FAQ
What is the maximum sampling rate of the LTC1594CS#PBF?
The LTC1594CS#PBF achieves a maximum sampling rate of 16.8ksps when operated with a 320kHz clock and full 12-bit resolution. This rate is confirmed in the datasheet's AC characteristics table under fSMPL(MAX). At lower clock frequencies or reduced resolution modes, the sampling rate scales linearly. The LTC1594CS#PBF maintains guaranteed DNL and INL performance across this entire range.
Can the LTC1594CS#PBF operate with a 3V supply?
No, the LTC1594CS#PBF is specified for 4.5V to 5.5V operation only. For 3V-compatible operation, Analog Devices offers the pin-compatible LTC1594LCS#PBF variant, which is explicitly characterized at 2.7V to 3.6V supply. Using the LTC1594CS#PBF below 4.5V violates absolute maximum ratings and may cause conversion errors or latch-up.
Does the LTC1594CS#PBF support differential input measurements?
The LTC1594CS#PBF supports pseudo-differential operation via the COM pin, which serves as the negative reference for all channels. However, it does not support true differential input pairs (e.g., CH0+/CH0−). Each channel measures single-ended voltage relative to COM, enabling ratiometric or floating measurements-but not fully differential signal rejection. This architecture is documented in the "Transfer Curve" section of the LTC1594CS#PBF datasheet.
How does the MUXOUT/ADCIN loop improve signal conditioning in the LTC1594CS#PBF?
The MUXOUT/ADCIN loop allows insertion of a single external circuit-such as a programmable-gain amplifier or anti-alias filter-between the multiplexer output and ADC input. This eliminates the need for per-channel signal conditioning components, reducing BOM cost and PCB area. The LTC1594CS#PBF's high-impedance MUXOUT (±200nA leakage) and ADCIN inputs ensure minimal loading, preserving accuracy across all four channels.
Is the LTC1594CS#PBF RoHS compliant and lead-free?
Yes, the LTC1594CS#PBF is RoHS compliant and lead-free, as indicated by the "#PBF" suffix in the part number. This designation confirms compliance with EU Directive 2011/65/EU and Analog Devices' lead-free manufacturing standards. The device uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 3 requirements.
LTC1594CS#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:
- -
LTC1594CS#PBF FAQ
1.How can I place an order for LTC1594CS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1594CS#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 LTC1594CS#PBF reliable?
The price and inventory of LTC1594CS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1594CS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1594CS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1594CS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1594CS#PBF?
LTC1594CS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1594CS#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 LTC1594CS#PBF?
For technical support, including LTC1594CS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1594CS#PBF requirements.
6.How does Aetrix verify that LTC1594CS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1594CS#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 LTC1594CS#PBF meets industry standards.
7.What is the process for return or replacement of LTC1594CS#PBF?
All LTC1594CS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1594CS#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 LTC1594CS#PBF part is unused and in its original packaging.
Return procedure for LTC1594CS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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