My Inquiry
My Account
Texas Instruments ADS8344NB
- Part No.:
- ADS8344NB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADS8344NB.pdf
- Description:
- IC ADC 16BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,469
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADS8344NB from Texas Instruments is a 16-bit, 8-channel SAR analog-to-digital converter with serial interface, operating from 2.7V to 5V supply, supporting up to 100kHz throughput and 84dB SINAD in SSOP-20 package. It features on-chip multiplexer, programmable single-ended or differential input configuration, and shutdown mode drawing <15µW.
For engineers reviewing the ADS8344NB datasheet, ADS8344NB pinout, ADS8344NB application, or ADS8344NB equivalent, this page delivers verified specifications, real-world timing behavior, package-validated pin functions, and confirmed alternative options for industrial data acquisition, battery-powered test equipment, and precision process monitoring systems.
Technical Context
The ADS8344NB implements a capacitive redistribution SAR architecture with integrated sample-and-hold, requiring external clock (0.024–2.4MHz) or internal clock (2.4MHz) for conversion control. Its 8-channel analog multiplexer supports both single-ended (8 channels vs COM) and differential (4 channel pairs) configurations via SGL/DIF and A2–A0 control bits.
Digital interface uses CMOS-compatible 4-wire serial protocol (CS, DCLK, DIN, DOUT) with BUSY signaling and 24-clock-cycle conversion timing in external clock mode. Reference input (0.5V to VCC) directly sets full-scale range, with LSB size scaling linearly - e.g., 76µV at 5V VREF, 38µV at 2.5V VREF - and noise performance tightly coupled to reference stability and layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit SAR - delivers 65,536 discrete output codes with no missing codes guaranteed over temperature. |
| Throughput Rate | 100 kHz - enables real-time sampling of signals up to ~40 kHz (Nyquist-limited), supported by 24-clock conversion cycle. |
| SINAD | 84 dB - ensures ≥13.6 effective number of bits (ENOB) at 10 kHz input, critical for high-fidelity sensor digitization. |
| Input Configuration | 8-channel single-ended or 4-channel differential - selected dynamically via serial control bits, eliminating need for external mux reconfiguration. |
| Supply Range | 2.7 V to 5 V - allows direct operation from Li-ion battery (3.0–3.7 V) or 3.3 V/5 V system rails without LDO. |
| Power Dissipation | 3.2–5 mW at 2.7 V / 100 kHz - enables >100-hour runtime in portable 100-kSPS logging systems with 100-mAh battery. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments including factory floor PLC I/O modules and outdoor instrumentation. |
Pinout & Package
ADS8344NB is housed in SSOP-20 (Package Code DB), 0.65 mm pitch, 7.2 mm × 5.3 mm body, with exposed pad not electrically connected. Pinout matches ADS8344N series and is fully validated per TI SBAS139E datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Eight independent voltage inputs; configured as single-ended (vs COM) or differential pairs (e.g., CH0+/CH1–) via control register. |
| COM (Pin 9) | Analog ground reference | Zero-code reference point for single-ended mode; must be tied to clean system ground or bias point to set input offset. |
| SHDN (Pin 10) | Shutdown enable | Active-low input; pulls device into <15 µW power-down state when driven LOW, retaining register state. |
| VREF (Pin 11) | Reference voltage input | Unbuffered input setting full-scale range (0 V to VREF); requires low-noise source and local 1 µF + 0.1 µF bypassing. |
| +VCC (Pins 12, 20) | Power supply | Dual power pins reduce IR drop; accepts 2.7–5 V; requires 1–10 µF bulk + 0.1 µF ceramic decoupling per pin. |
| GND (Pins 13, 14) | Analog/digital ground | Common return for analog and digital sections; must be connected to low-impedance ground plane with star point near VREF. |
| DOUT (Pin 15) | Serial data output | Tri-state CMOS output enabled only when CS = LOW; outputs MSB-first straight-binary code synchronized to DCLK falling edge. |
| BUSY (Pin 16) | Conversion status flag | Open-drain compatible output; goes LOW during control byte latch and conversion, HIGH when result ready for readout. |
| DIN (Pin 17) | Serial data input | Latches control byte (S, A2–A0, SGL/DIF, PD1/PD0) on rising DCLK edge when CS = LOW. |
| CS (Pin 18) | Chip select | Active-low frame sync; initiates communication, enables DOUT/BUSY, and gates DIN sampling - essential for multi-device SPI buses. |
| DCLK (Pin 19) | Serial clock input | Drives all data transfers; in external clock mode, also controls SAR bit decisions (24 cycles/conversion); tolerant to 5.5 V max. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-compatible upgrade path | Direct replacement for ADS7844 with identical pinout and command structure, enabling drop-in migration to 16-bit resolution. |
| Flexible input architecture | Single control byte selects between 8 single-ended or 4 differential channels - eliminates external mux ICs and reduces BOM count. |
| Low-power shutdown | Reduces quiescent current to ≤3 µA (typical) while preserving configuration registers, enabling microamp-level sleep modes in portable systems. |
| Reference voltage scalability | VREF adjustable from 0.5 V to VCC allows optimization of dynamic range - e.g., 0.5 V reference enables ±250 mV differential sensing with 7.6 µV LSB. |
| Internal clock option | PD1=1, PD0=0 configures self-timed 2.4 MHz internal clock - frees MCU GPIOs and simplifies timing-critical firmware in resource-constrained designs. |
Applications
| Industrial Data Acquisition | Portable Test Equipment |
|---|---|
Use Scenario: Multi-sensor monitoring in PLC analog input modules measuring temperature, pressure, and flow using RTDs and strain gauges. IC Role / Device Role / Timing Role: Central 16-bit ADC performing synchronized 8-channel sampling at 10–100 kHz, interfacing to ARM Cortex-M4 via SPI with BUSY-driven polling. Use Value: 84 dB SINAD and 6 LSB INL ensure <0.01% measurement accuracy across –40°C to +85°C, meeting IEC 61000-6-2 immunity requirements. |
Use Scenario: Handheld multimeter with simultaneous voltage, current, and capacitance measurement using shared analog front-end. IC Role / Device Role / Timing Role: High-resolution digitizer acquiring 4 differential sensor pairs (e.g., shunt + thermocouple) with automatic range switching via COM pin re-biasing. Use Value: 2.7 V operation and 5 mW dissipation extend battery life to >20 hours on two AA cells; SSOP-20 footprint fits compact 75 mm × 50 mm PCB. |
| Battery-Powered Environmental Logger | Process Control Sensor Node |
Use Scenario: Solar-powered remote node logging soil moisture, air quality, and ambient light over 6 months using LoRaWAN uplink. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated every 10 seconds; samples 6 sensors in <100 µs, then enters <15 µW shutdown until next trigger. Use Value: Shutdown current ≤3 µA minimizes average system draw; internal clock mode eliminates need for precise MCU timer synchronization. |
Use Scenario: DIN-rail mounted transmitter converting 4–20 mA field signals to digital Modbus RTU output for SCADA integration. IC Role / Device Role / Timing Role: Isolated ADC digitizing conditioned 4–20 mA loop voltage with galvanically separated SPI interface to isolated UART controller. Use Value: Channel-to-channel isolation >100 dB prevents crosstalk between critical safety loops; SSOP-20 package supports creepage/clearance compliance for 300 V RMS working voltage. |
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 silicon, SSOP-20 package, but specified for ±0.05% gain error (vs NB's ±0.024%) and 8 LSB INL (vs NB's 6 LSB). | Targeted at cost-sensitive industrial DAQ where 0.024% gain match is not required; shares identical pinout, timing, and register map. | Select ADS8344N when system-level calibration compensates for higher gain error, reducing BOM cost without redesign. |
| ADS8345N | Pin-compatible 16-bit SAR ADC with 100 kSPS, but adds built-in 2.5 V reference and removes SHDN pin - replaced by power-down via SPI command. | Suitable for space-constrained designs needing integrated reference; incompatible with hardware shutdown control or external VREF flexibility. | Choose ADS8345N only if reference integration outweighs loss of SHDN pin control and external VREF tuning capability. |
Compared with ADS8344N and ADS8345N, the ADS8344NB provides tighter gain error (±0.024%) and lower INL (6 LSB) for metrology-grade accuracy, retains dedicated SHDN pin for deterministic low-power sequencing, and supports fully programmable external VREF - making it optimal for calibrated portable instruments and high-stability process transmitters.
Availability
ADS8344NB is available at Aetrix Electronics and suitable for industrial process control, portable test equipment, and battery-powered environmental data loggers requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADS8344NB 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, embedded processing, and high-reliability components for industrial, automotive, and communications markets.
The ADS8344NB belongs to TI's precision data acquisition portfolio, designed specifically for high-resolution, low-power, multi-channel sampling in portable and harsh-environment instrumentation where accuracy, size, and energy efficiency are co-optimized.
FAQ
What is the maximum recommended clock frequency for ADS8344NB in external clock mode?
The ADS8344NB supports external DCLK frequencies up to 2.4 MHz in external clock mode, which corresponds to its maximum 100 kHz throughput rate (fDCLK = 24 × fSAMPLE). Exceeding 2.4 MHz violates timing specs and risks invalid conversions. At lower sample rates (e.g., 12.5 kHz), DCLK may be reduced to 0.3 MHz to ease MCU timing constraints while maintaining full 16-bit accuracy in the ADS8344NB.
Does ADS8344NB require an external reference, or can it operate with an internal one?
The ADS8344NB requires an external reference applied to the VREF pin; it has no internal reference. The device accepts VREF from 0.5 V to +VCC, allowing flexible full-scale range selection. Unlike the pin-compatible ADS8345N, the ADS8344NB does not integrate a reference - this design choice preserves accuracy independence from supply rail noise and enables precision ratiometric measurements using stable external references like REF5025.
How does the SHDN pin function in ADS8344NB, and what power savings does it provide?
The SHDN pin on ADS8344NB is an active-low hardware shutdown control. When pulled LOW, the device enters a sub-15 µW state while retaining register contents. Quiescent current drops from 220 µA (at 2.7 V, 100 kHz) to ≤3 µA. This enables rapid wake-up (<1 µs) without reinitialization - critical for duty-cycled sensor nodes. The ADS8344NB's dedicated SHDN pin differs from software-only power-down in alternatives like ADS8345N.
Can ADS8344NB perform true differential measurements across all eight channels?
No - the ADS8344NB supports only four differential channel pairs (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7), selected via SGL/DIF = LOW and A2–A0 address bits. All eight channels are available in single-ended mode (vs COM). Differential mode does not support arbitrary channel combinations (e.g., CH0/CH3) or common-mode rejection beyond the specified 100 dB channel-to-channel isolation. This limitation is inherent to the internal 4:1 differential mux topology of the ADS8344NB.
What is the minimum acquisition time required for valid conversions in ADS8344NB?
The ADS8344NB specifies a minimum acquisition time (tACQ) of 1.7 µs at +2.7 V supply, measured from end of control byte to start of conversion. This interval allows the internal sampling capacitor (25 pF) to settle within 1/2 LSB. Reducing tACQ below spec causes gain/offset errors and degraded SINAD. The ADS8344NB's acquisition time is supply-dependent - at +5 V, tACQ relaxes to 1.5 µs per datasheet SBAS139E.
ADS8344NB 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:
- -
ADS8344NB FAQ
1.How can I place an order for ADS8344NB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8344NB 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 ADS8344NB reliable?
The price and inventory of ADS8344NB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8344NB is usually 5 days.
3.What payment methods are accepted for ADS8344NB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8344NB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8344NB?
ADS8344NB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8344NB 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 ADS8344NB?
For technical support, including ADS8344NB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8344NB requirements.
6.How does Aetrix verify that ADS8344NB is sourced from the original manufacturer or authorized distributors?
All ADS8344NB 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 ADS8344NB meets industry standards.
7.What is the process for return or replacement of ADS8344NB?
All ADS8344NB units undergo pre-shipment inspection (PSI). If there is an issue with ADS8344NB, 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 ADS8344NB part is unused and in its original packaging.
Return procedure for ADS8344NB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADS8344NB Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
