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Texas Instruments ADS7808UB/1K
- Part No.:
- ADS7808UB/1K
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS7808UB/1K.pdf
- Description:
- IC ADC 12BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,626
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Product details
Overview
ADS7808UB/1K from Texas Instruments is a 12-bit, 100kHz sampling SAR analog-to-digital converter with serial CMOS interface, internal 2.5V reference, ±0.45 LSB INL/DNL, and single +5V supply operation. It supports six input ranges (±10V, 0V–5V, etc.), delivers 72dB SINAD at 45kHz, and targets precision data acquisition in industrial control and test equipment.
For engineers reviewing the ADS7808UB/1K datasheet, ADS7808UB/1K pinout, ADS7808UB/1K application, or ADS7808UB/1K equivalent, this page provides verified technical context, SO-20 package mapping, real-world timing behavior, and validated alternative options for signal chain design continuity.
Technical Context
The ADS7808UB/1K integrates a capacitor-based successive approximation register (SAR), track-and-hold, internal 2.5V reference, and serial data interface - all on a single CMOS die. Its architecture enables full 12-bit linearity without external trimming across –40°C to +85°C, using laser-trimmed scaling resistors for range selection.
It supports dual clocking modes: internal clock (auto-generates 12 DATACLK pulses per conversion) or external clock (synchronizes DATA output to user-supplied DATACLK). The SYNC output pulse eases integration with DSP processors, while BUSY and R/C signals coordinate acquisition timing with sub-10µs throughput cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4.88mV LSB step size on ±10V range for high-fidelity voltage measurement. |
| Sampling Rate | 100kHz - enables real-time capture of signals up to 45kHz with 72dB SINAD, meeting anti-aliasing requirements for industrial sensor interfaces. |
| INL / DNL | ±0.45 LSB - ensures monotonicity and <0.1% full-scale error without calibration, critical for closed-loop control feedback paths. |
| Reference | Internal 2.5V ±0.02V - eliminates need for external reference IC; supports external 2.3–2.7V reference for system-level voltage scaling. |
| Power Dissipation | 100mW max at 100kHz - compatible with thermally constrained industrial modules; drops to 50µW in PWRD HIGH mode. |
| Input Ranges | Six selectable: ±10V, ±5V, ±3.33V, 0–10V, 0–5V, 0–4V - configurable via external resistor networks per Figure 4, enabling multi-sensor front-end reuse. |
| Supply Voltage | +5V (±5%) on VANA and VDIG - single-rail operation simplifies power design; VDIG ≤ VANA prevents latch-up. |
Pinout & Package
ADS7808UB/1K is housed in a 20-pin SOIC (DW) package, 0.3" wide, 2.65mm max height, JEDEC MS-013 compliant, with 1.27mm pitch and RoHS-compliant CU NIPDAU-DCC finish. MSL Level-3 (260°C, 168hr).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R1IN, R2IN, R3IN | Analog Inputs | Three independent analog inputs; each configurable for ±10V, 0–5V, or other ranges via external resistor networks per Table I. |
| REF | Reference I/O | Outputs internal 2.5V reference or accepts external 2.3–2.7V source; requires 2.2µF tantalum bypass to AGND2. |
| CAP | Reference Buffer Cap | Connects 2.2µF tantalum capacitor to stabilize internal reference buffer; essential for maintaining 72dB AC performance. |
| R/C | Read/Convert Control | Falling edge initiates sample/hold and conversion; also triggers serial data output in internal-clock mode. |
| CS | Chip Select | Active-low enable; internally OR'ed with R/C to prevent spurious conversions during bus contention. |
| BUSY | Status Output | Active-low open-drain signal indicating conversion in progress; must go high before next R/C edge to allow acquisition time. |
| DATACLK | Clock I/O | Output-only in internal mode (12 pulses/conversion); bidirectional in external mode (input sync clock or output sync pulses). |
| DATA | Serial Data Out | 12-bit MSB-first output; format (straight binary or two's complement) selected by SB/BTC pin level. |
| SYNC | Synchronization Pulse | Output pulse aligned to DATACLK edge; used to align ADC data with DSP frame boundaries or DMA transfers. |
| PWRD | Power Down Input | High disables analog circuitry, reducing current to 50µW while preserving last conversion result in output register. |
Key Features
| Feature | Design Value |
|---|---|
| Single +5V supply operation | Eliminates dual-rail power design complexity and reduces BOM count in PLC and DAQ modules. |
| Pin-compatible with ADS7809 | Enables 12-bit/16-bit resolution upgrade path on same PCB layout, supporting scalable product families. |
| Internal or external reference selection | Supports system-level accuracy tuning: internal reference for simplicity, external for traceable metrology-grade calibration. |
| Simple DSP interface with SYNC | Reduces firmware overhead by providing hardware-aligned frame markers for zero-latency data capture in real-time control loops. |
| Laser-trimmed input scaling resistors | Guarantees specified linearity across all six input ranges without field calibration, lowering test time and cost. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Continuous voltage monitoring of temperature transducers, pressure sensors, and flow meters in factory-floor PLC racks. IC Role / Device Role / Timing Role: Primary ADC in isolated analog input module, digitizing ±10V sensor outputs at 100kHz with deterministic 10µs cycle time. Use Value: ±0.45 LSB INL ensures <0.1% full-scale error across –40°C to +85°C, eliminating recalibration during seasonal thermal cycling. |
Use Scenario: High-speed stimulus-response testing of op-amps and filters using programmable waveform generation and capture. IC Role / Device Role / Timing Role: Digitizer stage synchronized to pattern generator clock via EXT/INT and SYNC pins for jitter-free sampling alignment. Use Value: 72dB SINAD at 45kHz enables accurate THD and SFDR measurements without post-processing correction. |
| Motor Drive Current Sensing | Medical Instrumentation Signal Chain |
|
Use Scenario: Isolated phase-current sampling in servo drives using shunt resistors and sigma-delta modulator front-ends. IC Role / Device Role / Timing Role: Secondary ADC capturing filtered current waveforms at 100kHz, interfaced to C2000™ MCU via serial port. Use Value: Internal 2.5V reference and 0.3ms recovery after power-down support fast startup in safety-critical motion control sequences. |
Use Scenario: Biopotential signal digitization (ECG, EEG) requiring low-noise, calibrated DC-coupled input stages. IC Role / Device Role / Timing Role: Precision front-end ADC configured for 0–5V unipolar range with external 2.5000V reference for clinical-grade accuracy. Use Value: ±3mV unipolar zero error drift (±2ppm/°C) maintains baseline stability over patient-warm-up periods without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog-to-digital conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7809UB/1K | 16-bit resolution, identical SO-20 pinout and serial interface; 50kHz max sampling rate; higher power (120mW). | Used where extended dynamic range (>90dB SNR) is required at lower bandwidth, e.g., vibration analysis or audio test. | Select when resolution >12-bit is mandatory and 50kHz throughput suffices; no PCB change needed. |
| ADS8320EB/250 | 16-bit, 100kHz SAR ADC; SPI-compatible interface; 3.3V/5V flexible supply; no internal reference; 85dB SINAD @ 45kHz. | Preferred for new designs needing higher AC performance and modern 3.3V logic compatibility; lacks bipolar input flexibility. | Choose for greenfield projects prioritizing SNR and supply flexibility; requires interface redesign and external reference. |
Compared with ADS7808UB/1K, ADS7809UB/1K trades speed for resolution in the same footprint, while ADS8320EB/250 offers superior AC specs and 3.3V operation but removes integrated reference and bipolar range support - making ADS7808UB/1K optimal for legacy industrial upgrades requiring minimal layout change and guaranteed ±10V input capability.
Availability
ADS7808UB/1K is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, motor drive current sensing, and medical instrumentation requiring stable component supply across long-lifecycle deployments.
Supply support for ADS7808UB/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, embedded processing, and connectivity technologies, with decades of expertise in precision data converters and industrial-grade reliability.
The ADS7808UB/1K belongs to TI's precision SAR ADC product line, engineered for high-accuracy, low-power, single-supply data acquisition in harsh industrial environments - emphasizing robustness, configurability, and seamless DSP integration.
FAQ
What is the maximum sampling rate of the ADS7808UB/1K?
The ADS7808UB/1K achieves a maximum sampling rate of 100kHz under specified conditions (TA = –40°C to +85°C, VANA = VDIG = +5V). This rate is sustained with full 12-bit linearity and 72dB SINAD at 45kHz input frequency. Conversion time is 5.7–8µs, and total throughput cycle (acquire + convert) is 10µs, enabling deterministic real-time sampling in control loops.
Does the ADS7808UB/1K require an external reference voltage?
No, the ADS7808UB/1K includes an internal 2.5V reference (±0.02V) that meets all AC and DC specifications. However, it also supports external reference voltages from 2.3V to 2.7V for system-level calibration traceability. When using the internal reference, a 2.2µF tantalum capacitor must be connected between REF and AGND2, and CAP must be bypassed to AGND2 with another 2.2µF capacitor.
How does the ADS7808UB/1K handle multiple analog input ranges?
The ADS7808UB/1K supports six input ranges (±10V, ±5V, ±3.33V, 0–10V, 0–5V, 0–4V) via external resistor networks connected to R1IN, R2IN, and R3IN, as defined in Table I and Figures 4a/4b. Laser-trimmed internal scaling resistors ensure specified linearity across all ranges without recalibration. Range selection is purely hardware-configured - no register writes or digital control required.
What is the purpose of the SYNC pin on the ADS7808UB/1K?
The SYNC pin on the ADS7808UB/1K outputs a hardware synchronization pulse aligned to the DATACLK edge, triggered by R/C or CS transitions in external-clock mode. This pulse enables precise alignment of ADC data capture with DSP frame boundaries, DMA transfers, or FPGA sampling clocks - reducing software overhead and jitter-induced timing errors in real-time systems.
Can the ADS7808UB/1K operate from a 3.3V supply?
No, the ADS7808UB/1K requires +5V supplies on both VANA and VDIG pins, with tolerance of ±5% (+4.75V to +5.25V). VDIG must not exceed VANA. It is not 3.3V-compatible. For 3.3V systems, consider alternatives like the ADS8320EB/250, which supports dual-supply operation and offers SPI compatibility, though it lacks the internal reference and bipolar input flexibility of the ADS7808UB/1K.
ADS7808UB/1K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 12
- 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:
- -
ADS7808UB/1K FAQ
1.How can I place an order for ADS7808UB/1K through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7808UB/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 ADS7808UB/1K reliable?
The price and inventory of ADS7808UB/1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7808UB/1K is usually 5 days.
3.What payment methods are accepted for ADS7808UB/1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7808UB/1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7808UB/1K?
ADS7808UB/1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7808UB/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 ADS7808UB/1K?
For technical support, including ADS7808UB/1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7808UB/1K requirements.
6.How does Aetrix verify that ADS7808UB/1K is sourced from the original manufacturer or authorized distributors?
All ADS7808UB/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 ADS7808UB/1K meets industry standards.
7.What is the process for return or replacement of ADS7808UB/1K?
All ADS7808UB/1K units undergo pre-shipment inspection (PSI). If there is an issue with ADS7808UB/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 ADS7808UB/1K part is unused and in its original packaging.
Return procedure for ADS7808UB/1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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