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Texas Instruments ADS8345N
- Part No.:
- ADS8345N
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADS8345N.pdf
- Description:
- IC ADC 16BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,731
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Product details
Overview
ADS8345N from Texas Instruments is a 16-bit, 8-channel SAR analog-to-digital converter with synchronous serial interface, bipolar input range (±VREF), 100kHz throughput, and 85dB SINAD. It operates from a single 2.7V–5V supply, supports single-ended or differential input configurations, and targets precision data acquisition in battery-powered systems.
For engineers reviewing the ADS8345N datasheet, ADS8345N pinout, ADS8345N application, or ADS8345N equivalent, this page delivers verified specifications, SSOP-20 package mapping, real-world use cases in portable instrumentation and industrial monitoring, and two confirmed alternative parts with documented functional and parametric differences.
Technical Context
The ADS8345N implements a capacitive redistribution SAR architecture with integrated sample-and-hold and an 8-channel analog multiplexer. Its conversion timing is strictly controlled by either an external 24× sample clock or an internal oscillator, enabling flexible microprocessor interfacing without external timing constraints.
It features binary two's complement output format, CMOS-compatible digital I/O with overvoltage tolerance up to +5.5V, and programmable power-down modes (including auto-shutdown between conversions). Reference voltage range is 0.5V to VCC/2, directly setting full-scale input span as ±VREF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes for high-fidelity signal digitization |
| Throughput Rate | 100 kHz - enables real-time sampling of signals up to ~40 kHz (Nyquist-limited) |
| SINAD | 85 dB at 10 kHz input (5 Vp-p, +5V supply) - ensures ≥13.8 effective bits in typical conditions |
| Integral Linearity Error | ±8 LSB max (ADS8345N grade) - corresponds to ±0.05% FSR error affecting absolute accuracy |
| Supply Range | 2.7 V to 5.25 V - supports direct integration into 3.3V and 5V systems without level-shifting |
| Operating Temp | –40°C to +85°C - qualified for industrial and portable equipment deployment |
| Power Dissipation | 7.5–10 mW at 100 kHz (+5V) - enables extended battery life in handheld data loggers |
Pinout & Package
ADS8345N is packaged in a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, footprint code DB, and moisture sensitivity level (MSL) 3 per JEDEC J-STD-020. The package is RoHS-compliant and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 | Analog input channels | Eight single-ended inputs or four differential pairs; selected via A2–A0 and SGL/DIF control bits |
| COM | Common-mode reference | Reference node for single-ended mode; tied to VREF or system mid-supply to define input common voltage |
| SHDN | Shutdown control | Active-low input; reduces quiescent current to <15 µW when asserted |
| VREF | External reference input | Accepts 0.5 V to VCC/2; sets full-scale range as ±VREF; unbuffered, draws ~13–40 µA depending on VREF and rate |
| +VCC (Pins 12 & 20) | Power supply | Dual power pins reduce IR drop and improve PSRR; supports 2.7–5.25 V operation |
| GND (Pins 13 & 14) | Analog/digital ground | Separate ground pins minimize noise coupling between analog and digital sections |
| DIN / DOUT / DCLK / CS / BUSY | 4-wire serial interface | CMOS-level, overvoltage-tolerant (to +5.5 V); supports 24-cycle conversion protocol with MSB-first, falling-edge data valid |
Key Features
| Feature | Design Value |
|---|---|
| Pin-for-pin compatibility | Direct replacement for ADS7844 and ADS8344 - enables drop-in upgrade path with no PCB change |
| Bipolar input architecture | ±VREF input range with COM-referenced or fully differential configuration - eliminates need for external level-shifting circuitry |
| Programmable power-down | Auto shutdown between conversions (PD1=PD0=0) cuts supply current to 3 µA - extends battery runtime in intermittent-sampling applications |
| Internal clock option | Internal SAR clock (PD1=1, PD0=0) decouples conversion timing from host processor - simplifies firmware and improves noise immunity |
| Channel-to-channel isolation | 105 dB (at 10 kHz) - prevents crosstalk in multi-channel simultaneous sampling scenarios |
Applications
| Portable Data Logger | Industrial Sensor Hub |
|---|---|
|
Use Scenario: Multi-channel temperature, pressure, and humidity monitoring in field-deployed environmental sensors powered by Li-ion batteries. IC Role / Device Role / Timing Role: Central 16-bit ADC acquiring synchronized samples from 8 analog sensor outputs with ±2.5V bipolar range and 100kHz aggregate throughput. Use Value: Low 8mW active power and 15µW shutdown current extend battery life beyond 12 months; SSOP-20 footprint minimizes board area. |
Use Scenario: Distributed I/O module collecting analog signals from flow meters, RTDs, and strain gauges in factory automation PLC racks. IC Role / Device Role / Timing Role: High-accuracy front-end ADC providing isolated channel data to ARM-based controller via SPI-compatible serial interface. Use Value: 85dB SINAD and 105dB channel isolation ensure measurement integrity across noisy industrial environments; –40°C to +85°C rating guarantees reliability. |
| Handheld Test Equipment | Medical Vital Sign Monitor |
|
Use Scenario: Battery-powered oscilloscope/multimeter hybrid capturing transient waveforms and DC levels with user-selectable input ranges. IC Role / Device Role / Timing Role: Precision sampling ADC supporting both single-ended (for voltage probes) and differential (for current shunt sensing) modes via software-configurable SGL/DIF bit. Use Value: Bipolar ±VREF input eliminates external op-amp biasing; 16-bit resolution enables 0.0015% measurement accuracy required for calibration-grade tools. |
Use Scenario: Compact patient monitor digitizing ECG, respiration, and SpO₂ analog signals with low power and high SNR. IC Role / Device Role / Timing Role: Low-noise, low-drift ADC converting biopotential signals referenced to body potential (COM pin), rejecting common-mode interference. Use Value: 81–85dB SINAD at 1–10kHz preserves diagnostic waveform fidelity; CMRR >70dB up to 100kHz suppresses 50/60Hz mains noise. |
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 |
|---|---|---|---|
| ADS8344N | Same 16-bit SAR core, but 4-channel (not 8-channel); identical SSOP-20 package and pinout except CH4–CH7 unused | Limited to 4-input systems; lacks multiplexer flexibility for scalable sensor arrays | Select when channel count ≤4 and board layout reuse is critical; verify COM/VREF routing matches ADS8345N |
| ADS7844N | 12-bit resolution (vs 16-bit); same 8-channel, serial interface, and SSOP-20 package; lower power (3.5mW) | Lower accuracy (±1 LSB INL vs ±8 LSB); suitable only where 12-bit resolution suffices | Choose for cost-sensitive, lower-precision applications; not acceptable for medical or metrology use cases requiring 16-bit fidelity |
Compared with ADS8345N, ADS8344N offers identical interface and packaging but halves channel count, while ADS7844N sacrifices 4 bits of resolution and dynamic range to reduce cost and power-making ADS8345N the optimal choice for applications demanding both channel density and 16-bit accuracy.
Availability
ADS8345N is available at Aetrix Electronics and suitable for portable instrumentation, industrial process control, and battery-powered medical devices requiring stable component supply and long-term lifecycle support.
Supply support for ADS8345N 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 IC design.
The ADS8345N belongs to TI's precision SAR ADC product line, engineered for high-resolution, low-power, multi-channel data acquisition in portable and harsh-environment applications where accuracy, size, and energy efficiency are critical.
FAQ
What is the maximum recommended reference voltage for ADS8345N?
The ADS8345N accepts VREF from 0.5 V up to VCC/2. At +5V supply, maximum VREF is +2.5V; at +2.7V supply, it is +1.35V. Exceeding VCC/2 risks violating absolute maximum ratings and may cause nonmonotonic behavior or damage. The device achieves best SINAD (85 dB) and lowest INL (±8 LSB) when VREF = +2.5V and VCC = +5V.
Does ADS8345N support true differential input mode?
Yes, ADS8345N supports true differential input via its SGL/DIF control bit and channel pairing (e.g., CH0/CH4, CH1/CH5). In differential mode, the input is the voltage difference between two channels, with common-mode range centered on VREF and amplitude up to ±VREF per input. This provides inherent rejection of common-mode noise and eliminates need for external instrumentation amplifiers in many sensor interfaces.
Can ADS8345N operate with a 3.3V supply and still achieve full 16-bit performance?
Yes, ADS8345N is fully specified down to +2.7V supply. At +3.3V, it maintains 16-bit resolution, 100kHz throughput, and 81dB SINAD (at 1kHz). Integral linearity remains ±8 LSB, and power dissipation drops to 3.2–5mW. VREF must be ≤ +1.65V (VCC/2), and analog input range scales accordingly to ±VREF.
How does the SHDN pin interact with the power-down modes controlled by PD1/PD0 bits?
The SHDN pin provides hardware-level shutdown, forcing ADS8345N into ultra-low-power state (<15 µW) regardless of PD1/PD0 settings. PD1/PD0 bits control automatic power-down between conversions (PD1=PD0=0) or clock mode selection. SHDN overrides all register-controlled states - asserting SHDN disables internal clocks, analog circuitry, and digital I/O, while releasing SHDN restores full functionality after tstartup ≈ 1 µs.
Is ADS8345N pin-compatible with ADS8345EB or ADS8345E variants?
No - ADS8345N (SSOP-20, DB package) is not pin-compatible with ADS8345E or ADS8345EB, which use QSOP-20 (DBQ package) with different mechanical dimensions and lead pitch (0.635 mm vs 0.65 mm). While electrical functionality and pin functions match, PCB footprints are incompatible; layout redesign is required for substitution.
ADS8345N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- -
ADS8345N FAQ
1.How can I place an order for ADS8345N through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8345N 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 ADS8345N reliable?
The price and inventory of ADS8345N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8345N is usually 5 days.
3.What payment methods are accepted for ADS8345N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8345N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8345N?
ADS8345N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8345N 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 ADS8345N?
For technical support, including ADS8345N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8345N requirements.
6.How does Aetrix verify that ADS8345N is sourced from the original manufacturer or authorized distributors?
All ADS8345N 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 ADS8345N meets industry standards.
7.What is the process for return or replacement of ADS8345N?
All ADS8345N units undergo pre-shipment inspection (PSI). If there is an issue with ADS8345N, 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 ADS8345N part is unused and in its original packaging.
Return procedure for ADS8345N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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