Texas Instruments ADC700KH

Overview

ADC700KH from Burr-Brown is a 16-bit successive approximation analog-to-digital converter with internal buried-zener reference, current-controlled oscillator, and parallel/serial digital outputs. It delivers ±0.003% FSR linearity error, 17 µs max conversion time, and supports ±2.5V/±5V/±10V and 0V–+5V/+10V/+20V input ranges. Used in precision industrial data acquisition systems requiring stable, high-resolution digitization under commercial temperature conditions (0°C to +70°C).

For engineers reviewing the ADC700KH datasheet, ADC700KH pinout, ADC700KH application, or ADC700KH equivalent, this page provides verified technical context, validated pin functions, confirmed accuracy specs at 14-bit no-missing-codes level, real-world interface timing constraints, and two field-validated alternative parts for precision measurement system design.

Technical Context

The ADC700KH implements a fully integrated successive approximation architecture with on-chip 16-bit DAC, comparator, SAR logic, and output latch-eliminating external clock or reference requirements. Its laser-trimmed buried-zener reference achieves ±5 ppm/°C zero drift and ±8 ppm/°C gain drift over 0°C to +70°C.

It supports dual-output modes: TTL-compatible 8-bit parallel (high/low byte selectable via HBEN) and NRZ serial output with dedicated strobe (pin 14). BTCEN pin selects Binary Two's Complement for bipolar signals; unipolar uses Straight Binary. Conversion is initiated by WR pulse while CS enables device selection.

Key Specifications

Pinout & Package

ADC700KH is housed in a hermetic 28-pin side-braze ceramic DIP (Package Drawing #237), rated for 0°C to +70°C operation. The package provides robust thermal stability and low leakage for precision analog applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit successive approximation ADC applications.

Compared with ADC700KH, AD7703BN trades speed for noise floor, while ADS8505IPFB sacrifices integration (reference, clock, serial output) for throughput and power efficiency-making ADC700KH optimal for legacy industrial systems prioritizing self-contained precision and interface flexibility.

Availability

ADC700KH is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, aerospace sensor conditioning, and medical diagnostic instrumentation requiring stable component supply across extended lifecycle programs.

Supply support for ADC700KH 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

Burr-Brown Corporation was a U.S.-based analog IC designer acquired by Texas Instruments in 2000, renowned for high-precision data converters, amplifiers, and references.

The ADC700KH belongs to the ADC700 family of monolithic 16-bit successive approximation ADCs designed for high-stability, low-drift applications in industrial and military environments where external component count and thermal drift must be minimized.

FAQ

What is the guaranteed no-missing-codes resolution for ADC700KH?

The ADC700KH is specified to deliver no missing codes at the 14-bit level across its full 0°C to +70°C operating range. This is confirmed by its ±0.006% FSR differential linearity error-equivalent to ±1 LSB at 14 bits-and explicitly stated in the Ordering Information table for the KH grade. At 16-bit resolution, missing codes may occur outside the central 14-bit window, but system designs relying on monotonic behavior can safely use the upper 14 bits of ADC700KH output.

Does ADC700KH require an external clock or reference?

No, ADC700KH does not require an external clock or reference. It integrates a current-controlled oscillator for internal timing and a laser-trimmed buried-zener voltage reference with ±5 ppm/°C zero drift. Neither the clock nor the reference voltage is accessible externally-both are fully self-contained, reducing system component count and layout sensitivity. External clocking is not supported per the datasheet.

How is bipolar vs unipolar output coding selected on ADC700KH?

Bipolar vs unipolar output coding on ADC700KH is controlled by the BTCEN pin (pin 23). When BTCEN = 1, bipolar inputs are encoded in Binary Two's Complement (BTC); when BTCEN = 0, they use Bipolar Offset Binary (BOB). Unipolar inputs always use Straight Binary (USB), regardless of BTCEN state. This selection is hardware-configured and affects only the interpretation of the 16-bit parallel or serial output word.

What analog input ranges does ADC700KH support, and how are they configured?

ADC700KH supports six analog input ranges: ±2.5V, ±5V, ±10V, 0V–+5V, 0V–+10V, and 0V–+20V. Configuration is done externally via pin connections-not register writes-as detailed in Table I of the datasheet. For example, ±10V operation connects the signal to pin 1 and pin 28, while 0V–+20V uses pin 1 and pin 28 with BTCEN irrelevant. No internal configuration or software setup is needed.

Can ADC700KH perform simultaneous read-and-convert operations?

Yes, ADC700KH supports simultaneous read-and-convert via its output data latch. After conversion completes, the result is stored in a latch separate from the SAR logic. This allows the host processor to read the previous conversion's data (via RD/HBEN) while the next conversion is already underway-enabling continuous, deterministic sampling without pipeline stalls. The Data Ready flag (pin 12) indicates latched data validity and clears only upon MSB read.