HFA5251 Ver la hoja de datos (PDF) - Intersil

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componentes Descripción

Fabricante

HFA5251

800MHz Monolithic Pin Driver

Intersil 

HFA5251

essential since large AC current will flow through either

VCC2 or VEE2 during transients.

The output of the pin driver is usually connected to the

device-under-test (DUT) through 50Ω micro-strip line and

coaxial cable which carries the signal to a high input

impedance DUT pin.

References

1. Chris K. Davis et. al., “UHF1: A High Speed Complemen-

tary Bipolar Analog Process on SOI,” Bipolar Circuits and

Technology Meeting Proceedings, pp260-263, October

1992.

2. Donald K. Whitney Jr., “Symmetrical, High Speed, Volt-

age Switching Circuit,” United States Patent Pending,

Filed November 1991.

Definition of Terms

VOH and VOL

Output High Voltage and Output Low Voltage. VOH is the

voltage at VOUT when the HiZ input is Low and the DATA

input is High. VOL is the voltage at VOUT when HiZ is Low

and DATA is Low. The VOH and VOL levels are set with the

VHIGH and VLOW inputs respectively.

Offset Voltage

Offset Voltage is the DC error between the voltage placed on

VHIGH or VLOW and the resulting VOH and VOL. VHIGH

Offset Voltage Error is obtained by measuring VOH with

VHIGH set to 0V and VLOW set to -2.5V to minimize

interaction effects. VLOW Offset Voltage Error is the

measurement of VOL with VLOW set to 0V and VHIGH set to

+7.5V.

Gain

Gain is defined as the ratio of output voltage change to input

voltage change for a defined range. VHIGH Gain is calculated

with the following equation with VLOW fixed at -2.5V

VHIGHGAIN = V-----O----H----(---V----H----I--G-----H------a----t----6---.--5---V---7-)--.--–5----V-----O----H----(---V----H----I--G-----H------a---t------1----V----)

VLOW Gain is calculated in a similar manner.

VLOWGAIN = V-----O----L----(--V----L----O----W-------a----t---6----V----)----–7----.V-5---O-----L---(---V----L---O-----W-------a---t-------1---.--5---V-----)

VHIGH is held fixed at 7.5V. These Gain calculations

minimize the effects of Interaction and End Point

Nonlinearities.

Linearity Error

Linearity Error is a measure of output voltage worst case

deviation from a straight line that has been corrected for

offset and 7.5V Gain. Linearity Error is given as a

percentage of fullscale and is done in two ranges 5V and

8.5V. Data is measured at 0.5V steps from -1.5V to 7V for

VHIGH and -2V to 6.5V for VLOW. The Linearity Error

equation is as follows for 8.5V fullscale:

VOUT(IDEAL) = -VG----O-A---U-I--N-T-- – OFFSET

LINEARITYERROR = -V----O----U----T-----–-----V----O-8---.U--5---T---(---I--D-----E----A-----L----)

The Linearity Error equation is as follows for 5V fullscale:

LINEARITY ERROR = -V----O----U----T-----–-----V----O----U-----T---(---I--D-----E----A-----L---)-

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Linearity Error is calculated for every data point in the range

and the worst case value is recorded.

End Point Deviation

End Point Deviation is the percent change of gain in the 1V

range at the extremes of output voltage. Gain is calculated

for each 0.5V step and then compared to the adjacent step

for a percentage change. This specification is designed to

quantify the amount of curvature present at the end points of

output swing. VHIGH and VLOW inputs are corrected for gain

and offset to provide more accurate VOH and VOL levels. For

example VOH End Point Deviation is tested in the range 5.7V

to 6.7V as shown below:

GAIN6.7 – 6.2 = V-----O----H----(---V----H----I--G-----H------a---t----6---.--7---V-----)0---–-.-5---V----O----H-----(--V----H----I--G-----H------a---t----6---.--2---V-----)

GAIN6.2 – 5.7 = V-----O----H----(---V----H----I--G-----H------a---t----6---.--2---V-----)0---–-.-5---V----O----H-----(--V----H----I--G-----H------a---t----5---.--7---V-----)

END POINT DEVIATION = GAIN6.7 – 6.2 – GAIN6.2 – 5.7 × 100

End Point Gain Error

End Point Gain Error (EPGE) is the VOUT absolute error in

millivolts for a VHIGH change from 6.7V to 7V. The VHIGH

input is corrected for gain and offset to provide a more

accurate VOH level.

EPGE = VOH (VHIGH at 7V) - VOH (VHIGH at 6.7V) - 0.3

VHIGH to VLOW Interaction

VHIGH to VLOW Interaction is the change in VOUT (the active

channel) due to the inactive channel. VHIGH Interaction is

measured as the change in VOH from 1V as VLOW is moved

from 0V to 750mV (VLOW is corrected for gain and offset

errors). VLOW Interaction is measured as the change in VOL

from 0V as VHIGH is moved from 1V to 250mV (with VHIGH

corrected for gain and offset errors). The minimum

recommended difference between VHIGH and VLOW for the

HFA5251 is 250mV.

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