ADS7808P 12-Bit 100 kHz Serial ADC | Texas Instruments
Référence : ADS7808P ✓ ActifADS7808P Présentation
An ADC, or analog-to-digital converter, is an integrated circuit that converts a continuously varying analog voltage into a digital code. The ADS7808P belongs to the SAR ADC family: a sample-and-hold circuit captures the input, and a capacitor-based successive-approximation register converts the captured voltage into a 12-bit result. This architecture combines deterministic conversion behavior with relatively low power consumption, making it useful when a system needs accurate measurements without a high-speed flash converter or complex external acquisition hardware.
Key features include a 100 kHz maximum sampling rate, 72 dB SINAD with a 45 kHz input signal, six specified input ranges, and a serial output interface that can use either the internal clock or an external data clock. The converter also supports internal or external references. Its innovative single +5 V supply operation keeps system power requirements straightforward, while power dissipation remains below 100 mW according to the manufacturer datasheet. An output synchronization pulse helps interface the converter with standard digital signal processors.
The serial interface reduces the number of signal lines required on a mixed-signal PCB, although the conversion timing and serial clock relationship must be handled correctly in firmware or external logic. The internal reference simplifies designs that do not need an externally trimmed or calibrated voltage source. The six input ranges support bipolar and unipolar measurement systems, allowing the same converter family to address sensor signals, industrial process voltages, and conditioned analog outputs. The 10 µs conversion time corresponds to the stated 100 kHz throughput capability when the interface permits continuous operation.
Typical applications include multichannel industrial data acquisition, factory process monitoring, programmable logic controller analog input modules, laboratory measurement equipment, and embedded control systems. The ±10 V ranges are particularly useful for legacy industrial signals, while the 0 V to 5 V range suits sensors and low-voltage analog systems. The 12-bit resolution provides 4096 digital code levels across the selected input range and is appropriate for many control and monitoring tasks that require more precision than a coarse 8-bit converter but do not require a 16-bit part.
A key design consideration is the analog input and reference network. Place the input filtering components close to the converter pins, use a low-noise reference arrangement, and keep digital clock and serial-data traces away from sensitive analog nodes. Check timing against the external data-clock option when communicating with a DSP, because synchronization behavior affects how each conversion is framed and sampled.
This page combines the ADS7808P manufacturer specifications, pin and package guidance, application analysis, and drop-in-replacement criteria to support faster engineering review. Because exact replacement qualification depends on package, pinout, resolution, input range, timing, and supply requirements, any substitute should be checked against the manufacturer datasheet before production use.
Alternatives de remplacement direct pour ADS7808P — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Aucune alternative de remplacement direct disponible pour ce produit.
Demander des alternativesADS7808P Valeurs maximales et caractéristiques électriques
| Converter Type | 12-bit serial CMOS sampling analog-to-digital converter |
| Architecture | Capacitor-based successive-approximation-register SAR ADC with sample-and-hold |
| Résolution | 12 bit |
| Maximum Sampling Rate | 100 kHz |
| Conversion Time | 10 us |
| Signal-to-Noise and Distortion | 72 dB SINAD with 45 kHz input |
| Integral Nonlinearity | ±1/2 LSB |
| Differential Nonlinearity | ±1/2 LSB |
| Tension d'alimentation | +5 V |
| Power Dissipation | Under 100 mW |
| Number of Input Ranges | 6 ranges |
| Unipolar Input Range | 0 V to 5 V |
| Bipolar Input Range | ±10 V |
| Reference Source | Internal or external reference |
| Clock Source | Internal clock or external data clock |
| Output Interface | Serial CMOS output with output synchronization pulse |
| Boîtier | 20-pin plastic DIP (20-PDIP) |
Guide de configuration des broches du ADS7808P 20-pin plastic dip (20-pdip)
Configuration des broches du ADS7808P (boîtier 20-pin plastic dip (20-pdip)). Ce composant analogique comporte des broches d'entrée, de sortie et d'alimentation. Consultez la fiche technique du fabricant pour les configurations des broches d'annulation d'offset, de compensation et d'activation. Idéal pour le conditionnement de signaux et les circuits amplificateurs.
Aucune donnée de brochage détaillée disponible pour ADS7808P.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ADS7808P convient pour 6 applications: Industrial Process Monitoring, PLC Analog Input Modules, Factory Sensor Acquisition, Laboratory Measurement Equipment, Programmable Control Systems, Data Acquisition Instruments.
Industrial Process Monitoring
The ADS7808P fits industrial process-monitoring channels because it combines 12-bit resolution, a 100 kHz sampling rate, and a 10 µs conversion time in a single +5 V supply device. Its specified ±10 V ranges support conventional process signals, while 72 dB SINAD provides useful dynamic performance for supervisory control and data logging. The under-100 mW power design also reduces thermal burden in distributed acquisition equipment. Place the converter behind protected analog front ends and validate the selected range against the sensor or transmitter output.
Recommandé
PLC Analog Input Modules
The ADS7808P is suitable for programmable logic controller analog input modules that must accept legacy bipolar process voltages. Its ±10 V input capability, 12-bit code, and 100 kHz conversion rate allow one converter to serve measurement and supervisory-control channels. The serial output limits wiring density, which helps keep controller boards compact. Industrial deployments should still include surge and transient protection, calibrated input scaling, isolation where required, and careful grounding around the +5 V analog supply.
Recommandé
Factory Sensor Acquisition
The ADS7808P can digitize conditioned outputs from pressure, temperature, position, and level sensors when 12-bit resolution is adequate. Its 72 dB SINAD and ±1/2 LSB linearity specifications provide a defined conversion baseline, while the 0 V to 5 V range accepts many single-ended sensor outputs. Condition high-impedance sources close to the ADC so settling meets the 10 µs conversion interval, and add anti-alias filtering selected for the intended signal bandwidth.
Recommandé
Laboratory Measurement Equipment
The ADS7808P can serve as the conversion stage in laboratory instruments that repeatedly sample bipolar or unipolar voltages and transfer results over a serial link. Its six specified ranges, internal or external reference capability, and 100 kHz throughput support flexible front-end design. For bench instruments, use a low-noise reference if measurement accuracy warrants it, separate analog and digital return currents, and include calibration routines that characterize gain and offset over temperature.
Recommandé
Programmable Control Systems
The ADS7808P is appropriate for embedded control loops that need faster feedback than a low-rate delta-sigma converter can provide while remaining within a 12-bit measurement budget. A 10 µs conversion time and 100 kHz sampling capability allow the controller to sample a command or feedback node repeatedly. The serial interface keeps the pin count manageable, although the host processor must service clocking and data transfer without introducing excessive latency or digital coupling into the analog section.
Recommandé
Data Acquisition Instruments
The ADS7808P supports compact data-acquisition instruments that must convert several conditioned analog inputs and send results to a host processor. Its serial output reduces connector and PCB routing requirements compared with a parallel ADC, and the 20-pin DIP package simplifies through-hole prototyping and expansion-board layouts. During design, verify whether the DIP format fits the production process; production conversion to another package should be treated as a redesign rather than a mechanical substitution.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ADS7808P — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit |
|---|---|
| Brand | Texas Instruments |
| Package | 20-PDIP |
| Resolution | 12 bit |
| Sampling Rate | 100 kHz |
| Conversion Time | 10 us |
| SINAD | 72 dB with 45 kHz input |
| Integral Nonlinearity | ±1/2 LSB |
| Differential Nonlinearity | ±1/2 LSB |
| Supply Voltage | +5 V single supply |
| Power Dissipation | Under 100 mW |
| Input Ranges | 6 ranges, including ±10 V and 0 V to 5 V |
| Reference | Internal or external |
Principaux différenciateurs
- Combines 12-bit conversion with 100 kHz throughput (vs ADS7809UB)
- Supports legacy bipolar industrial signals (vs ADS8508IBDW)
- Single +5 V operation with low stated dissipation (vs AD7761)
Notes de conception
Place the ADS7808P adjacent to the input network and reference components, and keep the serial clock, data line, and return currents away from high-impedance analog nodes. Use a continuous ground plane with short paths from decoupling capacitors to the device ground pins. Maintain the analog signal path over a compact area and place protection or filtering components where their leakage and capacitance will not materially disturb the selected input range.
Decouple the +5 V supply close to the converter and follow the manufacturer's recommended capacitor values and placement. Because the datasheet specifies single-supply operation and power dissipation below 100 mW, the analog supply still needs clean routing and adequate return-current control. Avoid sharing high-current return paths with input-reference ground currents, and verify the supply tolerance and startup behavior across the complete operating condition.
Do not treat the ADS7809 as an automatic ADS7808P substitute: it is pin-compatible but increases resolution from 12 bits to 16 bits, which changes calibration, scaling, and signal-to-noise expectations. Also verify the exact ADS7808 package and pin assignment rather than copying a surface-mount layout. Review acquisition timing, reference selection, input range, and external clock framing together before approving any board revision.
If the analog source has high output impedance, place the first amplification or buffering stage close enough to the ADC to achieve adequate settling within the 10 µs conversion interval. Add an anti-alias filter for the intended bandwidth and determine its interaction with the source impedance. For externally clocked operation, use clean clock edges and routing that preserves the conversion and serial-data timing specified by the manufacturer.
Informations de conformité
The manufacturer landing-page material confirms the electrical function and package family but does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status.
