Differential and Integral non – linearity specifications are important specifications for a DAC.

Differential non-linearity in a DAC is a specification that describes the difference between two analog values corresponding to adjacent input digital values.The accuracy of a digital to analog converter is determined by this specification. Any two adjacent digital codes should correspond to output analog voltages that are exactly one Least Significant Bit (LSB) apart. Differential non-linearity measures the worst case difference from the ideal 1 LSB step. A DAC with a 1.5 LSB output change for a 1 LSB digital code change has a 0.5 LSB differential non-linearity.

Integral non-linearity describes the maximum deviation between the ideal output of a DAC and the actual output level after offset and gain errors have been taken into account. It is an important specification for measuring error in a digital-to-analog converter.The transfer function of a DAC should be a straight line. INL measurement depends on the ideal line selected. Lines typically used are the best fit line, the line that minimizes the INL result and the endpoint line that passes through the points on the transfer function corresponding to the lowest and highest input code. The INL is the *maximum difference* between the ideal line and the actual transfer function.

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**The input interface.**

The frequency divider has a differential analog interface. The following parameters apply:

The minimum frequency that can be input is 500 Mhz and the maximum frequency is 6.0 Ghz.

The RF input level is 5 dBm to – 5 dBm. For lower frequencies make sure that the slew rate is

greater than 560 V/us. The input is biased by two 500 Ohm resistors connected to a 1.6V DC bias.

Therefore AC coupling is used at the input. These are two 100pF capacitors.

**The output interface.**

The output is single ended. The output driver is capable of sourcing and sinking 24 mA. The

equivalent output impedance is 50 Ohm. To avoid reflections it is recommended that the divider

work into a 50 Ohm load.

**General operation.**

The inputs are applied to the input SMA I/O. The product will work with both a differential input as

well as a single ended input. However, a differential input works best. The division ratio is applied

to the N1 and N2 control inputs as follows:

N2 N1 Division ratio

0 0 8

0 1 16

1 0 32

1 1 64

The logic levels are:

Logic level Voltage

1 1.4V minimum

0 0.6V maximum

The supply voltage interface.

The operating supply voltage is 3.3V typical. The quiescent (DC) operating supply current is 2 mA.

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**RF Switch typical features**

Supply voltage = Vcc = 0/+5 Vdc

Operatng temperature = TA = -50° C to 125 Deg C

Operating impedance = 50 Ohm

Input power for 1 dB

compression ( 5.0V system) = 37 dBm ( f = 0.5 to 3 Ghz)

Input third order Intercept = 64 dBm ( 0 to 5.0V system, f = 0.5 to 3 Ghz)

Operating frequency range = DC to 3 Ghz.

Insertion loss DC to 3 Ghz = 0.8 dB

Isolation DC to 3 Ghz = 14 dB minimum

Return loss DC to 3 Ghz = 20 dB

50% contl to 10/90 %

( ON/OFF) = 120 ns

Summary Specifications

Gain, Operating: 19.5 dB

Operating frequency range: 1.0 – 2700 Mhz

OIP3: (Pout = 19.0 dBm), -8.5 dBm

P1dB: 4.6 dBm

N.F: 4.2 dB

Supply voltage Operating: 3.3 – 5.5 Volts

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Supply current Supply = 5.0V, 23.0 mA