ADS7809U - 16-Bit 100 kHz SAR ADC | Texas Instruments
N.º de pieza: ADS7809U ✓ ActivoADS7809U Descripción general
An SAR analog-to-digital converter is a sampling ADC that repeatedly estimates the input voltage through successive comparison steps. It belongs to the broader ADC category and provides a practical balance of resolution, conversion speed, power consumption, and circuit complexity. The ADS7809U combines a capacitor-based 16-bit SAR core, sample-and-hold circuitry, a reference, clocking, and a serial interface in one device.
Key specifications include 16-bit resolution, a 100 kHz sampling rate, 86 dB SINAD with a 20 kHz input, and ±2 LSB integral nonlinearity. The converter also features 16-bit DNL with no missing codes, six specified input ranges, and single +5 V operation. These characteristics make it appropriate for precision industrial measurement, instrumentation, control, and signal-acquisition systems.
The capacitor-based SAR architecture converts the sampled analog input through successive approximation. Data may be transferred through the serial interface using the internal oscillator or synchronized to an external data clock, giving the system designer flexibility in clocking and sampling control. The manufacturer data also identifies the ADS7809 as pin-compatible with the ADS7808, which can simplify comparison between related converter implementations.
Typical uses include factory process monitoring, sensor-interface digitizers, laboratory measurement equipment, industrial control loops, and embedded data acquisition. The 86 dB SINAD figure is particularly relevant when the converted signal contains relatively little noise, while the 100 kHz sampling rate supports applications that require substantially more update speed than a slow-resolution integrating ADC.
Designers should pay close attention to reference quality, source impedance, analog trace routing, decoupling, and digital-interface timing. The input network and reference must provide low enough noise and settling behavior to preserve the converter's specified accuracy, while the serial interface and clock source must meet the timing requirements described by Texas Instruments.
This product data consolidates the verified manufacturer and distributor findings with explicit data gaps, practical engineering guidance, and same-footprint replacement analysis. It is intended to help engineers identify the correct ADC, validate board-level assumptions, and compare genuine 20-pin SOIC drop-in options without conflating merely similar devices with compatible replacements.
Alternativas directas para ADS7809U — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ADS7809U (mismo factor de forma y huella) — difiere en Operating Temperature, Sampling Rate, Supply Voltage, Mounting Type, Package.
ADS7808UB/1K
✅ Sustitución directaConsulte el precio
Ver hoja de datos →ADS7809U/1K
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADS7809U/1KG4
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADS7809U/1KE4
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADS7809UE4
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADS7809U Valores máximos y características eléctricas
| Converter Type | Successive Approximation Register (SAR) ADC |
| Resolución | 16 bit |
| Frecuencia de muestreo | 100 kHz |
| Conversion Time | 10 us |
| Signal-to-Noise Plus Distortion | 86 dB with 20 kHz input |
| Integral Nonlinearity | ±2 LSB |
| Differential Nonlinearity | 16 bit with no missing codes |
| Input Range Options | 6 specified input ranges |
| Output Interface | Serial output |
| Tensión de alimentación | +5 V |
| Clocking | Internal or external data clock |
| Encapsulado | 20-pin SOIC (DW) |
| Tipo de montaje | Surface mount |
| Temperatura de funcionamiento | -40 °C to +85 °C |
| ADS7808 Compatibility | Pin-compatible with ADS7808 |
Guía de configuración de pines de ADS7809U 20-pin soic (dw)
Configuración de pines para ADS7809U (encapsulado 20-pin soic (dw)). Este componente analógico presenta pines de entrada, salida y alimentación. Consulte la hoja de datos del fabricante para conocer las configuraciones de los pines de ajuste de offset, compensación y habilitación. Ideal para circuitos de acondicionamiento de señal y amplificadores.
No hay datos detallados de patillaje disponibles para ADS7809U.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
ADS7809U es adecuado para 6 aplicacións: Industrial Process Monitoring, Precision Data-Acquisition Systems, Laboratory Measurement Equipment, Embedded Sensor Acquisition, Factory Control Systems, Audio and Vibration Monitoring.
Industrial Process Monitoring
The ADS7809U fits industrial process monitoring where a sensor must be digitized at up to 100 kHz with 16-bit resolution. Its stated 10 µs conversion time provides a 10 µs acquisition interval, while 86 dB SINAD with a 20 kHz input offers useful dynamic performance for slowly varying or moderately fast process signals. Place the converter behind a protected analog front end, use one of its six specified input ranges, and provide a low-noise reference. The primary engineering benefit is a compact combination of resolution, conversion speed, and serial output, although the selected input range, source impedance, and acquisition timing must be verified against the official datasheet.
Recomendado
Precision Data-Acquisition Systems
The ADS7809U is appropriate for precision data-acquisition systems requiring 16-bit samples at a 100 kHz maximum sampling rate. The 10 µs conversion time allows the acquisition system to update much faster than many low-speed panel-meter or sensor ADCs, and the internal or external clock capability supports both autonomous and synchronized sampling. Its 86 dB SINAD figure provides a useful benchmark when comparing the complete analog path. For best results, keep the reference and signal-conditioning paths short, observe the selected range's settling requirements, and separate serial clock and data-return traces from sensitive analog nodes.
Recomendado
Laboratory Measurement Equipment
The ADS7809U can serve as the conversion stage in laboratory instruments that digitize low-bandwidth analog signals with higher resolution and sampling capability than a basic meter ADC. The 16-bit format preserves fine amplitude detail, the ±2 LSB INL specification helps characterize systematic error, and the 100 kHz sampling rate supports calibrated signal capture. The device's six specified input ranges also allow a designer to match the source more closely than with a fixed-range converter. Reference stability, input buffering, grounding, calibration, and noise measurement must be included in the instrument's error budget; converter resolution alone does not establish overall measurement accuracy.
Recomendado
Embedded Sensor Acquisition
The ADS7809U is suitable for embedded acquisition of analog sensor outputs when the system needs more update capability than a slow embedded ADC. Its 100 kHz sampling rate and 10 µs conversion time support rapid sampling, while 16-bit resolution can represent a wide dynamic range with finer quantization steps. The single +5 V supply and 20-pin SOIC package simplify integration with a microcontroller-based embedded controller. Designers should select the correct one of six input ranges, verify settling for the sensor's source impedance, add the required bypass capacitors, and isolate high-impedance sensor nodes from digital return currents to avoid degrading the advertised noise and linearity performance.
Recomendado
Factory Control Systems
The ADS7809U can digitize analog control or diagnostic signals in factory equipment where compactness and update speed matter. At 100 kHz sampling, it can observe signal changes substantially faster than low-rate controller ADCs, and the serial interface avoids using a wide parallel bus. The 86 dB SINAD result under the stated 20 kHz input condition provides a useful baseline for control-loop and monitoring designs. Use the converter's six input-range options to minimize front-end gain, keep the reference quiet, and implement calibration if absolute accuracy is critical. A practical advantage is the combination of 16-bit data and a 10 µs conversion time in one 20-pin SOIC device.
Recomendado
Audio and Vibration Monitoring
The ADS7809U can be evaluated for audio-frequency or vibration monitoring systems requiring conversion above the 20 kHz measurement condition cited for its 86 dB SINAD figure. Its 100 kHz sampling rate provides multiple samples per cycle within the stated bandwidth, and 16-bit quantization avoids the coarse amplitude resolution of an 8-bit converter. The serial output suits embedded processing, while six input ranges simplify interface matching. Actual vibration performance will depend on anti-alias filtering, sensor excitation, analog bandwidth, reference noise, and clock jitter, none of which are specified in the supplied search data and therefore must be obtained from the complete manufacturer documentation.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ADS7809U — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ADS7808U | ADS7809U/1K | ADS7809U/1KG4 | ADS7809U/1KE4 | ADS7809UE4 |
|---|---|---|---|---|---|---|
| Package | SOIC-20 (DW) | SOIC-20 (DW) | SOIC-20 (DW) | SOIC-20 (DW) | SOIC-20 (DW) | SOIC-20 (DW) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
Diferenciadores clave
- Documented pin compatibility with a related TI converter (frente a ADS7808U)
- Conversion speed (frente a ADS7808U)
- Measured dynamic performance (frente a ADS7808U)
- Orderable package consistency (frente a ADS7809UE4)
Notas de diseño
The ADS7809U operates from a single +5 V supply, so the reference and analog front end must remain within the input and common-mode limits defined by the complete manufacturer datasheet. Place required bypass capacitors close to the supply and reference pins, provide a low-impedance return path, and verify the reference noise contribution against the stated 86 dB SINAD condition. The supplied data does not specify capacitor values, so no numerical values should be substituted without checking the official application guidance.
Keep the analog input, reference, and ground paths compact and physically separated from the serial clock, data, and digital-control traces. The 10 µs conversion interval does not eliminate the need for input settling: high-impedance sources and long copper tracks can introduce error before the sample-and-hold captures the signal. Compare the selected range's acquisition requirements with the source impedance and place any specified input RC network directly at the converter pins.
Use the internal clock for autonomous operation or synchronize to an external data clock when the system requires deterministic sampling. Treat the serial interface timing, clock polarity, and data-valid interval as design constraints from the TI datasheet rather than generic assumptions. For a 100 kHz sampling system, route clock and data over a continuous ground reference, minimize stubs, and avoid sharing high-current switching paths with the analog reference or input network.
Do not treat a 16-bit converter as an inherently 16-bit-accurate measurement system. In the ADS7809U, reference quality, source impedance, acquisition time, analog noise, layout, and calibration all affect the final result. Confirm that the selected one of six input ranges covers the signal without clipping, verify the ±2 LSB INL and no-missing-code requirements in the intended operating mode, and check absolute accuracy and temperature behavior in the complete data sheet.
Información de cumplimiento
The supplied verified search snippets did not contain explicit compliance statements for the ADS7809U. Compliance values are therefore reported as unknown rather than inferred.
