REV. 0

AD10226

–10–

10MHz

= 52.22 – j0.421

50MHz

= 50.69 – j2.84

100MHz = 47.50 – j3.58

150MHz = 44.61 – j0.970

200MHz = 43.70 + j3.70

250MHz = 46.41 + j9.48

300MHz = 53.09 + j14.76

TPC 13. Input Impedance S11

FREQUENCY – MHz

0.1

1

10

1

2

3

4

5

6

7

8

9

10

0

100

1000

1MHz

= 1.010

10MHz = 1.028

50MHz = 1.045

100MHz = 1.066

140MHz = 1.090

160MHz = 1.126

200MHz = 1.170

TPC 14. Voltage Standing Wave Ratio (VSWR)

Equivalent Circuits

24k

8k

ENCODE

ENCODE

8k

24k

Test Circuit 1. Equivalent ENCODE Input

100

DIGITAL

OUTPUT

Test Circuit 2. Equivalent Digital Output

Q1

NPN

Test Circuit 3. Equivalent Voltage Reference Output

15k

50

3.75k

15k

3.75k

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.