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Texas Instruments ADS8345E
- Part No.:
- ADS8345E
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADS8345E.pdf
- Description:
- IC ADC 16BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,080
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Product details
Overview
ADS8345E 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 QSOP-20 package - used in portable data loggers and battery-powered test equipment for high-resolution multi-channel voltage monitoring.
For engineers reviewing the ADS8345E datasheet, ADS8345E pinout, ADS8345E application, or ADS8345E equivalent, this page delivers verified specifications, real-world timing behavior, channel configuration logic, and validated alternative options for industrial and portable measurement systems.
Technical Context
The ADS8345E implements a capacitive redistribution SAR architecture with integrated sample-and-hold, operating from a single 2.7V–5.25V supply. It supports both single-ended (8-channel) and differential (4-channel) analog input configurations via programmable SGL/DIF control bit and A2–A0 channel address bits.
Conversion is synchronized to an external 24× sample clock (DCLK) or internal oscillator (PD1=1, PD0=0). BUSY signal asserts low during acquisition and conversion; DOUT shifts out 16-bit two's complement data on falling DCLK edges after control byte receipt.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 1 LSB = 76µV at VREF = 2.5V, enabling sub-millivolt precision in sensor and instrumentation front-ends. |
| Throughput Rate | 100kHz - supports real-time sampling of fast transients in motor control feedback or power quality monitoring. |
| SINAD | 85dB at 10kHz (5V supply) - ensures ≥13.7 effective bits for accurate dynamic signal capture in noisy environments. |
| Input Configuration | 8-channel single-ended or 4-channel differential - selectable per conversion via SGL/DIF bit, allowing flexible sensor interfacing without external mux reconfiguration. |
| Power Dissipation | 7.5–10mW at 100kHz / +5V - enables continuous high-speed operation in thermally constrained handheld instruments. |
| Reference Range | 0.5V to VCC/2 - permits scalable input spans (e.g., ±1.25V at +2.7V supply), supporting low-voltage battery systems while maintaining full 16-bit resolution. |
| Integral Linearity | ±8 LSB max - guarantees monotonicity and predictable error budget for closed-loop control calibration. |
Pinout & Package
ADS8345E is housed in a 20-pin QSOP (DBQ) package with 0.65mm pitch, optimized for compact PCB layouts in portable instrumentation. Pin functions are electrically validated per TI SBAS177C Rev C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 | Analog input channels | Eight independent inputs configurable as single-ended (vs COM) or differential pairs (e.g., CH0+/CH0−); COM must be tied to stable reference point. |
| COM | Common-mode reference | Provides return path for single-ended mode; sets common-mode voltage for differential mode - must be low-impedance and noise-filtered. |
| VREF | External reference input | Unbuffered input setting full-scale span (±VREF); draws 13–40µA depending on VREF and conversion rate - requires local 0.1µF + bulk decoupling. |
| +VCC, GND | Power supply | Dual +VCC pins (pins 12 & 20) and dual GND pins (13 & 14) reduce supply impedance and improve PSRR in mixed-signal layouts. |
| CS, DCLK, DIN, DOUT | 4-wire serial interface | CMOS-compatible, overvoltage-tolerant (to +5.5V); DOUT high-impedance when CS HIGH - enables daisy-chaining or isolation without level shifters. |
| BUSY | Conversion status indicator | Active-low open-drain output signaling acquisition/conversion phase - synchronizes host MCU read timing without polling overhead. |
| SHDN | Hardware shutdown control | Active-low input reducing quiescent current to <15µW - used for duty-cycled sensing in ultra-low-power data loggers. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-for-pin compatibility with ADS7844/ADS8344 | Enables drop-in upgrade from 12-bit to 16-bit resolution without PCB redesign or firmware changes to SPI timing logic. |
| Programmable power-down modes (PD1/PD0) | Three modes: always-on, auto-shutdown between conversions (3µA), or internal clock activation - optimizes energy per sample in intermittent acquisition. |
| Channel-to-channel isolation >105dB | Minimizes crosstalk in simultaneous multi-sensor monitoring (e.g., temperature + pressure + voltage), preserving signal integrity without guard traces. |
| Internal sample-and-hold with 500ns settling | Eliminates need for external SHA; supports accurate sampling of multiplexed signals up to 100kHz without aperture jitter degradation. |
| Bipolar error match ≤4 LSB | Ensures consistent zero-crossing accuracy across all 8 channels - critical for differential measurements like bridge sensor outputs or current shunt polarity detection. |
Applications
| Portable Data Logger | Industrial Sensor Hub |
|---|---|
|
Use Scenario: Battery-powered field unit acquiring temperature, humidity, and strain gauge readings from 8 sensors at 10Hz–1kHz rates. IC Role / Device Role / Timing Role: Central 16-bit ADC managing multiplexed analog inputs via serial command; BUSY-driven interrupt triggers data read after each 16-cycle conversion window. Use Value: 85dB SINAD and ±8 LSB INL ensure calibrated accuracy across environmental conditions; 8mW power enables >1-week runtime on 2x AA cells. |
Use Scenario: DIN-rail mounted module aggregating analog outputs from 4 pressure transmitters and 4 RTD interfaces in factory automation. IC Role / Device Role / Timing Role: High-isolation ADC digitizing differential 4–20mA loop derivatives and ratiometric RTD voltages; COM pin referenced to system AGND for common-mode rejection. Use Value: >105dB channel isolation prevents cross-talk between high-gain current-sense and low-level RTD paths; QSOP-20 footprint fits dense I/O carrier boards. |
| Handheld Test Equipment | Battery Management System (BMS) |
|
Use Scenario: Pocket oscilloscope/analyzer capturing transient waveforms from 4 probe inputs with user-selectable coupling (AC/DC) and range. IC Role / Device Role / Timing Role: Configurable ADC accepting single-ended (probe tip–ground) or differential (probe tip–reference) inputs; SGL/DIF bit dynamically switched per channel. Use Value: 100kHz throughput and 85dB SINAD support 20kHz bandwidth measurements; internal clock mode (PD1=1, PD0=0) decouples conversion timing from host processor clock jitter. |
Use Scenario: Cell voltage monitor in 12S Li-ion pack, measuring individual cell potentials with 1mV resolution and thermal drift compensation. IC Role / Device Role / Timing Role: Precision ADC digitizing isolated cell taps using external 1.25V reference; SHDN pin cycled between measurements to minimize self-heating and leakage-induced offset drift. Use Value: ±1.0mV bipolar error and <0.5 LSB gain drift over –40°C to +85°C enable accurate state-of-charge estimation without frequent recalibration. |
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 |
|---|---|---|---|
| ADS8344E | 12-bit resolution, same 20-pin QSOP package and pinout; 100kHz rate, 70dB SINAD, ±2 LSB INL. | Limited to lower-accuracy applications like basic voltage monitoring where 16-bit resolution is unnecessary. | Select when cost sensitivity outweighs resolution requirements and existing layout uses ADS8344 footprint. |
| ADS8684IPWR | 16-bit, 4-channel, pseudo-differential input only; integrated reference and PGA; 500kSPS rate; TSSOP-20 package. | Requires external signal conditioning for true differential inputs; higher speed but no 8-channel single-ended mode. | Choose for higher throughput or built-in gain scaling, but verify COM pin routing and channel count sufficiency. |
Compared with ADS8345E, ADS8344E trades 4 bits of resolution for lower cost and power, while ADS8684IPWR offers faster sampling and on-chip features at the expense of flexible input configuration and direct pin compatibility.
Availability
ADS8345E is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor hubs, and handheld test equipment requiring stable component supply with guaranteed long-term manufacturability.
Supply support for ADS8345E 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 reliability.
The ADS8345E 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.
FAQ
What is the maximum recommended clock frequency for ADS8345E when operating at 100kHz throughput?
The ADS8345E requires fDCLK = 24 × fSAMPLE, so at 100kHz throughput, the external clock must be 2.4MHz. This value is confirmed in the Electrical Characteristics table for both +5V and +2.7V operation. Exceeding 2.4MHz violates timing margins and risks invalid conversions - the device does not support oversampling or higher clock rates for this throughput grade. ADS8345E maintains full specification compliance only within this constraint.
Can ADS8345E operate with a 1.25V reference voltage, and what impact does that have on LSB size?
Yes, ADS8345E supports VREF from 0.5V to VCC/2, including 1.25V at +2.7V supply. At 1.25V, LSB size = 1.25V / 65536 ≈ 19µV - half that of the 2.5V reference case. This reduces absolute resolution but preserves 16-bit code depth; however, internal noise (~20µVrms) becomes comparable to LSB, requiring averaging for stable results. The ADS8345E datasheet explicitly validates performance at this reference point.
How does the SHDN pin function, and what is its effect on power consumption?
The SHDN pin is an active-low hardware shutdown control. When pulled LOW, ADS8345E enters ultra-low-power mode drawing <15µW (typical 3µA at +5V), as specified in the Electrical Characteristics table. It retains configuration state and resumes full operation within microseconds of SHDN returning HIGH - no initialization delay. This feature is validated for use in duty-cycled data loggers where the ADS8345E sleeps between samples.
Is ADS8345E compatible with 3.3V microcontrollers, and how are digital logic levels defined?
Yes, ADS8345E is fully compatible with 3.3V MCUs. Its digital inputs (CS, DCLK, DIN) accept VIH ≥ +VCC × 0.7 (min 1.89V at +2.7V supply) and VIL ≤ +0.8V, while outputs (DOUT, BUSY) drive VOH ≥ +VCC × 0.8 and VOL ≤ 0.4V - all verified across the full 2.7V–5.25V supply range. Overvoltage tolerance to +5.5V eliminates level-shifter needs when interfacing with 5V hosts.
What is the purpose of the COM pin, and how should it be connected in single-ended versus differential mode?
In single-ended mode (SGL/DIF = HIGH), COM serves as the reference node for all CH0–CH7 inputs and must be held at a stable voltage - typically VREF or +VCC/2 - using a low-impedance source. In differential mode (SGL/DIF = LOW), COM becomes the negative input for selected channel pairs (e.g., CH0–COM), requiring matched source impedances to avoid gain/linearity errors. Both configurations are explicitly detailed in Figures 2–5 and Tables III–IV of the ADS8345E datasheet.
ADS8345E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- -
ADS8345E FAQ
1.How can I place an order for ADS8345E through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8345E 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 ADS8345E reliable?
The price and inventory of ADS8345E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8345E is usually 5 days.
3.What payment methods are accepted for ADS8345E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8345E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8345E?
ADS8345E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8345E 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 ADS8345E?
For technical support, including ADS8345E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8345E requirements.
6.How does Aetrix verify that ADS8345E is sourced from the original manufacturer or authorized distributors?
All ADS8345E 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 ADS8345E meets industry standards.
7.What is the process for return or replacement of ADS8345E?
All ADS8345E units undergo pre-shipment inspection (PSI). If there is an issue with ADS8345E, 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 ADS8345E part is unused and in its original packaging.
Return procedure for ADS8345E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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