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Texas Instruments ADS8345NB/1K
- Part No.:
- ADS8345NB/1K
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADS8345NB/1K.pdf
- Description:
- IC ADC 16BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,061
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Product details
Overview
ADS8345NB/1K from Texas Instruments is a 16-bit, 8-channel SAR analog-to-digital converter with synchronous serial interface, bipolar input range (±VREF), 100kHz throughput rate, and 85dB SINAD - designed for precision data acquisition in battery-powered instrumentation and portable measurement systems.
For engineers reviewing the ADS8345NB/1K datasheet, ADS8345NB/1K pinout, ADS8345NB/1K application, or ADS8345NB/1K equivalent, this page delivers verified specifications, SSOP-20 package mapping, real-world use scenarios, and two validated alternative parts for multi-channel, low-power, high-SINAD sampling applications.
Technical Context
The ADS8345NB/1K implements a capacitive redistribution SAR architecture with integrated sample-and-hold, supporting both single-ended (8-channel) and differential (4-channel) analog inputs referenced to COM or VREF. It operates from a single 2.7V–5.25V supply and accepts external reference voltages from 500mV to VCC/2.
Digital control is executed via a 4-wire CMOS-compatible serial interface (CS, DCLK, DIN, DOUT) with BUSY signaling and programmable power-down modes (PD1/PD0). Conversion timing is configurable for internal clock (2.4MHz) or external clock operation, with 24-clock-cycle full conversion including acquisition, conversion, and data transfer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes for high-precision digitization of analog sensor or signal sources. |
| Throughput Rate | 100kHz - supports real-time sampling of fast-changing industrial or biomedical waveforms without aliasing at Nyquist. |
| SINAD | 85dB (at 10kHz, +5V) - ensures ≥13.9 effective bits (ENOB) for accurate dynamic signal representation in test equipment. |
| Integral Linearity Error | ±6 LSB max (ADS8345NB grade) - corresponds to ±0.024% FSR error, critical for calibration-critical measurement front-ends. |
| Supply Range | 2.7V to 5.25V - enables direct integration into 3.3V or 5V embedded systems without level-shifting or LDO overhead. |
| Reference Input Range | 0.5V to VCC/2 - allows flexible scaling of input span (e.g., ±1.25V at 2.7V supply or ±2.5V at 5V supply) while maintaining bipolar operation. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and portable outdoor environments without derating. |
Pinout & Package
ADS8345NB/1K is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm pitch, optimized for compact PCB layouts in space-constrained portable instruments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 | Analog input channels | Eight single-ended or four differential input paths selectable via SGL/DIF and A2–A0 control bits; support multiplexed scanning without external mux. |
| COM | Common-mode reference | Provides return path for single-ended inputs; tied to VREF or mid-supply to establish common-mode voltage for differential mode. |
| SHDN | Shutdown control | Active-low input enabling ultra-low-power mode (<15µW) - essential for battery life extension in handheld data loggers. |
| VREF | External reference input | Unbuffered input setting full-scale range (±VREF); LSB = VREF/65536 - requires low-noise, stable source for ENOB preservation. |
| +VCC (Pins 12 & 20) | Power supply | Dual VCC pins reduce IR drop and improve PSRR; supports 2.7V–5.25V operation with typical quiescent current of 1.2mA at 10kHz. |
| GND (Pins 13 & 14) | Analog/digital ground | Separate ground pins minimize coupling between analog sampling and digital switching noise - critical for 16-bit accuracy. |
| CS, DCLK, DIN, DOUT | Serial interface signals | 4-wire SPI-compatible interface with BUSY handshake; DOUT high-impedance when CS high enables easy bus sharing. |
| BUSY | Conversion status indicator | Active-low open-drain output signaling acquisition/conversion phase - simplifies timing synchronization with microcontroller GPIO. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-for-pin compatibility with ADS7844/ADS8344 | Enables drop-in upgrade path from 12-bit to 16-bit resolution without PCB redesign or firmware changes. |
| Onboard 8-channel analog multiplexer | Eliminates need for external analog switches or mux ICs - reduces BOM count, layout area, and channel-to-channel mismatch. |
| Programmable power-down modes (PD1/PD0) | Supports three operational states: always-on, auto power-down between conversions, and internal clock mode - optimizing power vs. latency trade-offs. |
| Channel-to-channel isolation >105dB | Prevents crosstalk-induced measurement errors in simultaneous multi-sensor monitoring (e.g., thermocouple + strain gauge on same device). |
| CMOS-compatible digital interface | Accepts 5.5V-tolerant inputs on all digital pins - allows direct interfacing with 5V microcontrollers even when operating from 2.7V supply. |
Applications
| Portable Data Logger | Industrial Sensor Hub |
|---|---|
Use Scenario: Battery-powered field instrument acquiring temperature, pressure, and humidity from eight analog sensors over 24-hour cycles. IC Role / Device Role / Timing Role: Central 16-bit ADC performing time-multiplexed sampling with automatic channel sequencing and low-power shutdown between reads. Use Value: 85dB SINAD and ±6 LSB INL ensure sub-0.025% measurement accuracy across temperature; 1.2mA quiescent current at 10kHz extends battery life beyond 1 year. |
Use Scenario: DIN-rail mounted PLC module conditioning and digitizing analog outputs from flow meters, RTDs, and current loops in factory automation. IC Role / Device Role / Timing Role: High-reliability front-end ADC providing isolated, calibrated 16-bit readings to ARM-based controller via SPI. Use Value: –40°C to +85°C rating and 105dB channel isolation prevent cross-talk in electrically noisy plant environments; SSOP-20 footprint eases conformal coating and thermal management. |
| Handheld Test Equipment | Medical Vital Signs Monitor |
Use Scenario: Pocket-sized oscilloscope/multimeter hybrid capturing transient waveforms and DC levels from multiple probes simultaneously. IC Role / Device Role / Timing Role: Precision sampling engine supporting both single-ended probe inputs and differential sensor interfaces (e.g., ECG leads). Use Value: Bipolar ±VREF input range accommodates AC-coupled signals without external level-shifting; 100kHz throughput enables 20kHz bandwidth per channel. |
Use Scenario: Portable patient monitor digitizing ECG, SpO₂, and respiration signals with clinical-grade linearity and noise immunity. IC Role / Device Role / Timing Role: Low-noise, low-power ADC handling multi-lead biopotential acquisition with programmable gain and filtering via external op-amps. Use Value: 85dB SINAD and <100ps aperture jitter preserve waveform fidelity for arrhythmia detection; shutdown mode reduces idle power to <15µW during sleep intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8344NB/1K | 12-bit resolution, ±8 LSB INL, 100kHz rate, identical SSOP-20 pinout and serial interface. | Lower precision suitable for cost-sensitive industrial controls where 12-bit ENOB suffices; lacks 16-bit dynamic range for audio or medical diagnostics. | Select when resolution requirements are ≤12 bits and BOM cost reduction is prioritized over measurement fidelity. |
| ADS8325IPW | 16-bit, 100kSPS, but single-channel, TSSOP-20, no onboard mux, higher 12mW power at 5V. | Requires external multiplexer for multi-channel use; better for high-speed single-signal capture (e.g., motor phase current) than multiplexed sensor arrays. | Choose for applications needing maximum single-channel SNR (>89dB) and minimal aperture jitter, not channel density. |
Compared with ADS8344NB/1K, ADS8345NB/1K delivers 4 extra bits of resolution and tighter INL for calibration-critical systems; versus ADS8325IPW, it trades single-channel performance for integrated 8:1 analog multiplexing and lower active power - making it optimal for portable multi-sensor platforms where board space and battery life are constrained.
Availability
ADS8345NB/1K is available at Aetrix Electronics and suitable for portable data loggers, industrial sensor hubs, and handheld test equipment requiring stable component supply, long-term lifecycle support, and guaranteed SSOP-20 packaging consistency.
Supply support for ADS8345NB/1K 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade signal chain solutions.
The ADS8345NB/1K belongs to TI's precision SAR ADC product line, engineered specifically for battery-operated, multi-channel measurement systems demanding high resolution, low power, and robust serial interfacing - not general-purpose conversion.
FAQ
What is the maximum supported external clock frequency for ADS8345NB/1K?
The ADS8345NB/1K supports external clock frequencies up to 2.4MHz, which corresponds to its maximum 100kHz conversion rate (fDCLK = 24 × fSAMPLE). At lower throughput rates, the clock may be reduced proportionally - for example, 1.2MHz for 50kHz sampling. Operation outside the 0.024MHz–2.4MHz range violates timing specifications and risks invalid conversions.
Does ADS8345NB/1K require an external reference voltage, and what are the valid ranges?
Yes, ADS8345NB/1K requires an external unbuffered reference voltage applied to the VREF pin. Valid range is 0.5V to VCC/2 - e.g., 0.5V–2.5V at +5V supply or 0.5V–1.35V at +2.7V supply. Using VREF = 2.5V yields 76µV/LSB; reducing VREF increases LSB sensitivity to noise and offset errors, requiring careful layout and low-noise sources.
How does the SHDN pin function on ADS8345NB/1K, and what power savings does it provide?
The SHDN pin on ADS8345NB/1K is an active-low shutdown control. When pulled LOW, the device enters ultra-low-power mode drawing <15µW total - reducing quiescent current from ~1.2mA to sub-µA levels. This feature is essential for extending battery life in portable instruments that sample intermittently, such as environmental data loggers.
Can ADS8345NB/1K perform true differential measurements, and how is it configured?
Yes, ADS8345NB/1K supports true differential input mode using four channel pairs (e.g., CH0/CH4, CH1/CH5) selected via the SGL/DIF bit and A2–A0 address bits. In differential mode, the input span is ±VREF with common-mode rejection >80dB up to 100kHz. The COM pin serves as the common reference node, and both inputs must be driven with matched source impedances to maintain INL and gain match.
What is the meaning of "NB" in ADS8345NB/1K, and how does it differ from the "N" variant?
The "NB" suffix in ADS8345NB/1K denotes the enhanced performance grade: ±6 LSB integral linearity error and ±0.024% gain error, versus ±8 LSB and ±0.05% for the standard "N" variant (ADS8345N/1K). Both share the same SSOP-20 package (DB), –40°C to +85°C rating, and pinout - making NB a direct upgrade for applications demanding tighter DC accuracy without layout changes.
ADS8345NB/1K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 4, 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V, 5V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V, 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8345NB/1K FAQ
1.How can I place an order for ADS8345NB/1K through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8345NB/1K 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 ADS8345NB/1K reliable?
The price and inventory of ADS8345NB/1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8345NB/1K is usually 5 days.
3.What payment methods are accepted for ADS8345NB/1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8345NB/1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8345NB/1K?
ADS8345NB/1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8345NB/1K 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 ADS8345NB/1K?
For technical support, including ADS8345NB/1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8345NB/1K requirements.
6.How does Aetrix verify that ADS8345NB/1K is sourced from the original manufacturer or authorized distributors?
All ADS8345NB/1K 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 ADS8345NB/1K meets industry standards.
7.What is the process for return or replacement of ADS8345NB/1K?
All ADS8345NB/1K units undergo pre-shipment inspection (PSI). If there is an issue with ADS8345NB/1K, 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 ADS8345NB/1K part is unused and in its original packaging.
Return procedure for ADS8345NB/1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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