REV. 0

AD10201

–10–

17k

8k

100

100

17k

8k

ENCODE

ENCODE

Test Circuit 1. Equivalent ENCODE Input

100

DIGITAL

OUTPUT

Test Circuit 2. Equivalent Digital Output

Q1

NPN

Test Circuit 3. Equivalent Voltage Reference Output

7k

50

7k

5k

5k

Test Circuit 4. Equivalent Analog Input

DEFINITION OF TERMS

Analog Bandwidth

The analog input frequency at which the spectral power of the

fundamental frequency (as determined by the FFT analysis) is

reduced by 3 dB.

Aperture Delay

The delay between the 50% point on the rising edge of the ENCODE

command and the instant at which the analog input is sampled.

Aperture Uncertainty (Jitter)

The sample-to-sample variation in aperture delay.

Differential Nonlinearity

The deviation of any code from an ideal 1 LSB step.

ENCODE Pulsewidth/Duty Cycle

Pulsewidth high is the minimum amount of time that the

ENCODE pulse should be left in logic “1” state to achieve rated

performance; pulsewidth low is the minimum time ENCODE

pulse should be left in low state. At a given clock rate, these specs

define an acceptable ENCODE duty cycle.

Harmonic Distortion

The ratio of the rms signal amplitude to the rms value of the

worst harmonic component.

Integral Nonlinearity

The deviation of the transfer function from a reference line measured

in fractions of 1 LSB using a “best straight line” determined by

a least square curve fit.

Minimum Conversion Rate

The ENCODE rate at which the SNR of the lowest analog signal

frequency drops by no more than 3 dB below the guaranteed limit.

Maximum Conversion Rate

The ENCODE rate at which parametric testing is performed.

Output Propagation Delay

The delay between the 50% point of the rising edge of ENCODE

command and the time when all output data bits are within valid

logic levels.

Power Supply Rejection Ratio

The ratio of a change in output offset voltage to a change in

power supply voltage.

Signal-to-Noise-and-Distortion (SINAD)

The ratio of the rms signal amplitude (set at 1 dB below full-scale)

to the rms value of the sum of all other spectral components,

excluding the first six harmonics and dc. [May be reported in dBc

(i.e., degrades as signal levels are lowered) or in dBFS (always

related back to converter full-scale).]

Signal-to-Noise Ratio (without Harmonics)

The ratio of the rms signal amplitude (set at 1 dB below full-scale)

to the rms value of the sum of all other spectral components,

excluding the first six harmonics and dc. [May be reported in

dBc (i.e., degrades as signal levels are lowered) or in dBFS (always

related back to converter full-scale).]

Spurious-Free Dynamic Range

The ratio of the rms signal amplitude to the rms value of the peak

spurious spectral component. The peak spurious component may

or may not be a harmonic. [May be reported in dBc (i.e., degrades

as signal levels is lowered) or in dBFS (always related back to

converter full-scale).]

Two-Tone Intermodulation Distortion Rejection

The ratio of the rms value of either input tone to the rms value

of the worst third order intermodulation product; reported in dBc.

Voltage Standing Wave Ratio (VSWR)

The ratio of the amplitude of the electric field at a voltage maximum

to that at an adjacent voltage minimum.

– Equivalent Circuits