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Texas Instruments ADS7809U/1KG4
- Part No.:
- ADS7809U/1KG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS7809U/1KG4.pdf
- Description:
- IC ADC 16BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,235
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Product details
Overview
ADS7809U/1KG4 from Texas Instruments is a 16-bit, 100kHz sampling CMOS successive-approximation analog-to-digital converter (SAR ADC) with integrated sample-and-hold, internal 2.5V reference, serial interface, and single +5V supply operation. It delivers ±3 LSB integral nonlinearity, 83dB SINAD at 20kHz input, and supports six input ranges including ±10V and 0V to 5V - deployed in precision industrial data acquisition systems requiring high-resolution DC and AC signal digitization.
For engineers reviewing the ADS7809U/1KG4 datasheet, ADS7809U/1KG4 pinout, ADS7809U/1KG4 application, or ADS7809U/1KG4 equivalent, key selection considerations include its 10µs throughput time, SO-20 package compatibility with ADS7808, internal/external clock flexibility, binary two's complement or straight binary output format, and industrial –40°C to +85°C temperature rating.
Technical Context
The ADS7809U/1KG4 implements a capacitor-based SAR architecture with on-chip sample-and-hold and programmable input scaling resistors enabling six user-selectable analog input ranges. Its serial interface supports both internal clock–driven transmission (2.3MHz DATACLK output) and external clock synchronization with SYNC pulse generation for DSP interfacing.
It operates from a single +5V supply (VDIG = VANA = 5V), draws 16mA analog current and 0.3mA digital current, dissipates ≤100mW in active mode, and features power-down mode reducing consumption to 50µW. Input impedance varies per range (e.g., 22.9kΩ for ±10V), and reference can be sourced internally (2.48–2.52V) or externally (2.3–2.7V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - provides 65,536 discrete codes; LSB = 305µV for ±10V range. |
| Sampling Rate | 100kHz - enables real-time capture of signals up to 50kHz (Nyquist-limited) with full accuracy. |
| INL | ±3 LSB - ensures monotonicity and accurate representation of linear analog ramps across full scale. |
| SINAD | 83dB at 20kHz - supports high-fidelity digitization of audio-band and sensor signals with low noise/distortion. |
| Throughput Time | 10µs - includes 2µs acquisition + 8µs conversion; enables tight control loop timing in closed-loop systems. |
| Supply Voltage | +4.75V to +5.25V - single-rail operation simplifies power design; VDIG must not exceed VANA. |
| Operating Temperature | –40°C to +85°C - fully specified for industrial environments without derating. |
Pinout & Package
ADS7809U/1KG4 is housed in a 0.3" wide SOIC-20 (DW) package with standard 1.27mm pitch, 2.65mm max height, and RoHS-compliant lead finish. Pin 1 identifier is marked via notch or bevel; tape-and-reel packaging (1000 units/reel) conforms to JEDEC MS-013 and TI DW0020A outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R1IN, R2IN, R3IN | Analog Inputs | Three independent high-impedance inputs configurable for ±10V, 0V–5V, or other ranges using external resistor networks. |
| REF | Reference I/O | Outputs internal 2.5V reference or accepts external 2.3–2.7V reference; requires 2.2µF tantalum bypass to AGND2. |
| CAP | Reference Buffer Capacitor | Connects 2.2µF tantalum capacitor to AGND2 to stabilize internal reference buffer; critical for linearity stability. |
| SB/BTC | Data Format Select | LOW = binary two's complement (bipolar); HIGH = straight binary (unipolar); sets output coding scheme. |
| EXT/INT | Serial Clock Mode | LOW = internal DATACLK generation; HIGH = external DATACLK synchronization with SYNC pulse output. |
| R/C | Read/Convert Control | Falling edge initiates conversion and hold; rising edge (with CS LOW) triggers data readout in external clock mode. |
| BUSY | Status Output | Active-low open-drain signal indicating conversion in progress; used for handshaking with host controller. |
| PWRD | Power-Down Enable | HIGH disables analog circuitry, reduces power to 50µW, and retains last conversion result in output register. |
Key Features
| Feature | Design Value |
|---|---|
| Single +5V Supply Operation | Eliminates dual-supply design complexity while maintaining full 16-bit performance across industrial temperature range. |
| Six Configurable Input Ranges | Includes ±10V, ±5V, ±3.33V, 0V–10V, 0V–5V, 0V–4V - selectable via external resistor networks per Table I. |
| Internal 2.5V Reference | 2.48–2.52V (±0.8%) with 1µA source capability; buffered output supports external loading with proper decoupling. |
| DSP-Compatible Serial Interface | SYNC pulse aligns data transfers to external clocks; TAG input allows streaming metadata alongside conversion results. |
| No Missing Codes | Guaranteed 15-bit monotonicity (ADS7809U) - ensures unambiguous code transitions across full dynamic range. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous voltage/current monitoring of PLC analog I/O modules in factory automation systems. IC Role / Device Role / Timing Role: Primary high-accuracy ADC digitizing sensor outputs (e.g., RTD, strain gauge bridges) at 100kHz for real-time control feedback. Use Value: ±3 LSB INL and 83dB SINAD ensure <1% total error in 4–20mA loop calibration and thermocouple cold-junction compensation. |
Use Scenario: Digitizing waveform signals in portable oscilloscopes and automated test equipment (ATE) front-ends. IC Role / Device Role / Timing Role: High-fidelity sampling stage preceding FPGA-based FFT analysis and display rendering. Use Value: 10µs throughput and external clock sync enable precise trigger alignment and jitter-free multi-channel sampling. |
| Medical Instrumentation | Energy Metering |
Use Scenario: Biopotential signal acquisition in ECG/EEG patient monitors requiring low-noise, DC-coupled analog input paths. IC Role / Device Role / Timing Role: Precision front-end ADC converting amplified electrode signals with programmable gain and bipolar input support. Use Value: Six input ranges and ±10V capability allow direct connection to isolated amplifier outputs without level-shifting circuitry. |
Use Scenario: High-accuracy voltage and current sampling in Class 0.2 smart electricity meters compliant with IEC 62053. IC Role / Device Role / Timing Role: Metrology-grade ADC capturing mains waveform harmonics and RMS values under varying load conditions. Use Value: 83dB SINAD at 20kHz and 16-bit resolution meet harmonic distortion and accuracy requirements for revenue-grade metering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7809UB | ±2 LSB INL (vs. ±3 LSB), 86dB SINAD (vs. 83dB), same SO-20 package and pinout. | Higher linearity required in metrology-grade calibration fixtures where <0.005% full-scale error is mandatory. | Select ADS7809UB when tighter DC accuracy and improved AC performance justify cost premium. |
| ADS8320EB | 16-bit, 100kSPS, SPI-compatible, but uses external reference only; no internal 2.5V reference or multi-range resistor network. | Used in space-constrained designs where external reference already exists and simplified BOM outweighs configurability. | Choose ADS8320EB if system-level reference architecture is fixed and SO-20 footprint compatibility is secondary to SPI protocol alignment. |
Compared with ADS7809U/1KG4, ADS7809UB offers superior linearity and noise performance in the same footprint, while ADS8320EB trades built-in flexibility for protocol standardization and external reference dependency - guiding selection based on reference architecture and accuracy tier requirements.
Availability
ADS7809U/1KG4 is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement instrumentation, and medical signal acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS7809U/1KG4 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 connectivity technologies, with decades of expertise in precision data converters and industrial-grade IC design.
The ADS7809U/1KG4 belongs to TI's precision SAR ADC product line, engineered for high-accuracy, low-power, single-supply data acquisition in demanding industrial and instrumentation applications.
FAQ
What is the maximum sampling rate supported by the ADS7809U/1KG4?
The ADS7809U/1KG4 is fully specified for continuous operation at 100kHz sampling rate across the industrial temperature range (–40°C to +85°C). This rate is achievable using either the internal clock (2.3MHz DATACLK output) or external clock up to 10MHz, with guaranteed 10µs throughput time including acquisition and conversion phases.
Does the ADS7809U/1KG4 require an external reference voltage?
No - the ADS7809U/1KG4 integrates a laser-trimmed 2.5V internal reference (2.48–2.52V) usable directly for most applications. However, it also supports external reference voltages from 2.3V to 2.7V applied to the REF pin, enabling higher system-level accuracy when paired with precision external references.
How does the ADS7809U/1KG4 handle different analog input voltage ranges?
The ADS7809U/1KG4 supports six specified input ranges (±10V, ±5V, ±3.33V, 0V–10V, 0V–5V, 0V–4V) via external resistor networks connected to R1IN/R2IN/R3IN and CAP/REF pins. Table I in the datasheet defines exact resistor values and connections; laser-trimmed scaling resistors ensure accuracy across all ranges.
Is the ADS7809U/1KG4 pin-compatible with other devices in the ADS78xx family?
Yes - the ADS7809U/1KG4 is explicitly pin-compatible with the 12-bit ADS7808 in the same SO-20 (DW) package. This allows drop-in upgrades from 12-bit to 16-bit resolution without PCB layout changes, preserving existing signal routing, power, and ground connections.
What digital interface protocols does the ADS7809U/1KG4 support?
The ADS7809U/1KG4 uses a proprietary synchronous serial interface - not SPI or I²C - with configurable clock source (internal or external), programmable data format (binary two's complement or straight binary), and optional SYNC pulse output for DSP synchronization. Data is transmitted as 16-bit serial stream on the DATA pin aligned to DATACLK edges.
ADS7809U/1KG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7809U/1KG4 FAQ
1.How can I place an order for ADS7809U/1KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7809U/1KG4 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 ADS7809U/1KG4 reliable?
The price and inventory of ADS7809U/1KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7809U/1KG4 is usually 5 days.
3.What payment methods are accepted for ADS7809U/1KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7809U/1KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7809U/1KG4?
ADS7809U/1KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7809U/1KG4 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 ADS7809U/1KG4?
For technical support, including ADS7809U/1KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7809U/1KG4 requirements.
6.How does Aetrix verify that ADS7809U/1KG4 is sourced from the original manufacturer or authorized distributors?
All ADS7809U/1KG4 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 ADS7809U/1KG4 meets industry standards.
7.What is the process for return or replacement of ADS7809U/1KG4?
All ADS7809U/1KG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7809U/1KG4, 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 ADS7809U/1KG4 part is unused and in its original packaging.
Return procedure for ADS7809U/1KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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