ADS774KE
ADS774KE - 12-Bit 125 kSPS SAR ADC | Texas Instruments
Texas Instruments ADS774KE is a 12-bit, single-channel, successive-approximation analog-to-digital converter with a maximum conversion time of 8.5 us, an integrated sampling function, and microprocessor-compatible parallel interfacing. The device is supplied in a 28-pin PDIP package and operates from a single +5 V supply, making it suitable for industrial data-acquisition, instrumentation, control, and embedded measurement systems.
An ADC is a data-converter IC that converts an analog input voltage into a digital value for processing by a microprocessor, microcontroller, programmable logic controller, or digital signal processor. Successive-approximation converters repeatedly compare the input voltage with an internally generated DAC until the residual falls below one least-significant-bit threshold. The ADS774 combines that conversion technique with an internal sampling network, reference, clock, and microprocessor interface to form a complete sampling ADC.
The primary characteristics of the ADS774KE are 12-bit resolution, one analog input channel, an 8.5 us maximum conversion time over the specified temperature range, and operation from a single +5 V supply. Its maximum sampling frequency is identified as 125 kSPS, while the product listing also describes approximately 117 kHz sampling. The parallel digital interface allows the converter to transfer each 12-bit result directly into a microprocessor or other parallel data bus.
The internal capacitor-array CDAC implements the successive-approximation conversion function in low-power CMOS. Because sampling is integrated into the converter, most designs do not require a separate sample-and-hold amplifier. The complete converter function, including its reference and clock, reduces external circuit complexity, although the input source still needs to satisfy the acquisition, impedance, settling-time, and bypass-capacitance requirements described by Texas Instruments.
ADS774KE is applicable in process monitoring, industrial sensor interfaces, laboratory measurement equipment, digital panel meters, factory-control systems, and legacy microprocessor data-acquisition cards. It is particularly relevant when an existing parallel-bus system needs a complete 12-bit conversion function and the added integration of the ADS774 reduces the component count compared with a discrete sample-and-hold, reference, converter, and interface arrangement.
Designers should pay close attention to analog grounding, input-source impedance, reference behavior, and the acquisition interval available before each conversion. Place the bypass capacitors specified in the manufacturer datasheet close to their associated supply pins, and route analog input traces away from digital clock and interface lines. Confirm timing against the host processor because the ADS774 requires control signals and data acquisition to be coordinated within its conversion sequence.
This page combines the manufacturer function description with package, resolution, interface, application, and replacement guidance. It also separates verified drop-in choices from older converter families so engineers can assess board-level compatibility before committing to a replacement.
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