Owner's manual

Pin Descriptions and Equivalent Circuits (Continued)

Digital I/O

10 Clock

Digital clock input. The range of frequencies for this input is 300 kHz to 2.5

MHz. The clock frequency should not be changed or interrupted during

conversion or while reading data output.

11 CAL

CAL is a level-sensitive digital input that, when pulsed high for at least two

clock cycles, puts the ADC into the CALIBRATE mode. Calibration should

be performed upon ADC power-up (after asserting a reset) and each time

the temperature changes by more than 50˚C since the ADC14061 was last

calibrated. See Section 2.3 for more information.

40 RESET

RESET is a level-sensitive digital input that, when pulsed high for at least 2

CLOCK cycles, results in the resetting of the ADC. This reset pulse must

be applied after ADC power-up, before calibration.

18 RD

RD is the (READ) digital input that, when low, enables the output data

buffers. When this input pin is high, the output data bus is in a high

impedance state.

44 PD

PD is the Power Down input that, when low, puts the converter into the

power down mode. When this pin is high, the converter is in the active

mode.

17 EOC

EOC is a digital output that, when low, indicates the availability of new

conversion results at the data output pins.

23-32

35-38

D00-13

Digital data outputs that make up the 14-bit TRI-STATE conversion results.

D00 is the LSB, while D13 is the MSB (SIGN bit) of the two’s complement

output word.

Analog Power

6, 7,

Positive analog supply pins. These pins should be connected to a clean,

quiet +5V source and bypassed to AGND with 0.1 µF monolithic capacitors

in parallel with 10 µF capacitors, both located within 1 cm of these power

pins.

5, 8,

AGND

The ground return for the analog supply. AGND and DGND should be

connected together directly beneath the ADC14061 package. See Section

5 (Layout and grounding) for more details).