ADS7808P
ADS7808P 12-Bit 100 kHz Serial ADC | Texas Instruments
Texas Instruments ADS7808P is a 12-bit, 10 µs serial CMOS sampling analog-to-digital converter with a 100 kHz sampling rate, six specified input ranges including ±10 V and 0 V to 5 V, and a single +5 V supply. The device is packaged in a 20-pin plastic DIP (20-PDIP) package. Its 72 dB SINAD performance and ±1/2 LSB INL and DNL characteristics make it suitable for industrial instrumentation, data acquisition, process control, and precision signal-chain designs that require a compact, low-power serial ADC.
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.
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