REV. 0

AD6600

–10–

DEFINITIONS OF SPECIFICATIONS

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. The bandwidth is determined by the internal

track-and-hold when the filter node is resonated.

Aperture Delay

The delay between the 50% point of 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.

Attenuator 3OIP

The third order intercept point of the front end of the AD6600.

It is the point at which the third order products would theoreti-

cally intercept the input signal level if the input level could increase

without bounds. This is measured using the ADC within the

AD6600 while the input is stimulated with dual tones in the

minimum attenuation (i.e., maximum gain) range.

Channel Isolation

The amount of signal leakage from one channel to the next

when one channel is driven with a full-scale input, and the other

channel is swept from –20 dBFS to –90 dBFS with a frequency

offset. The leakage is measured on the side with the smaller signal.

Differential Analog Input Resistance, Differential Analog

Input Capacitance and Differential Analog Input Impedance

The real and complex impedances measured at each analog

input port. The resistance is measured statically and the capaci-

tance and differential input impedances are measured with a

network analyzer.

Differential Analog Input Voltage Range

The peak-to-peak differential voltage that must be applied to the

converter to generate a full-scale response. Peak differential

voltage is computed by observing the voltage on a single pin and

subtracting the voltage from the other pin, which is 180 degrees

out of phase. Peak-to-peak differential is computed by rotating

the inputs phase 180 degrees and taking the peak measurement

again. The difference is then computed between both peak

measurements.

Differential Nonlinearity

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

Differential Resonant Port Resistance

The resistance shunted across the resonant port (nominally

630

Ω). Used to determine the filter bandwidth and gain of

that stage.

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. See timing implications of

define an acceptable Encode duty cycle.

Full-Scale Gain Tolerance

Unit-to-unit variation in full-scale input power.

Full-Scale Input Power

Expressed in dBm. Computed using the following equation:

Power

V

Z

FULL SCALE

FULL SCALE rms

INPUT

=

























10

0 001

2

log

.

Gain Matching (Input A:B)

Variation in full-scale power between A and B inputs.

Harmonic Distortion, 2nd

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

second harmonic component, reported in dBc.

Harmonic Distortion, 3rd

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

third harmonic component, reported in dBc.

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 fre-

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

Maximum Conversion Rate

The encode rate at which parametric testing is performed.

Noise (For Any Range Within the ADC)

VZ

NOISE

FS

SNR

Signal

dBm

dBc

dBFS

=×

×

−−









0 001 10

10

.

where:

Z

is the input impedance,

FS

is the full-scale of the device for the frequency in question,

SNR is the value for the particular input level,

Signal is the signal level within the ADC reported in dB below

full scale. This value includes both thermal and quanti-

zation noise.

Range-Range Gain Tolerance

The gain error in the RSSI attenuator ladder from one range to

the next.

Range-Range Phase Tolerance

The phase error in the RSSI attenuator ladder from one range

to the next.

Differential Resonant Port Capacitance

The capacitance between the two resonant pins. Used to deter-

mine filter bandwidth and resonant frequency.