THS770012

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SLOS669C

– FEBRUARY 2010 – REVISED JANUARY 2012

Power-Down

The standard EVM is used with T1 and T2 removed, jumpers placed across terminals 3 to 4 and 1 to 6, R15 and

R17 = 49.9

Ω, C9 and C13 = 0Ω, and R5, R6, R16, and R21 = open. A waveform generator is connected to the

power-down input of the EVM with a 50

Ω coaxial cable at J8. The differential output at J3 and J4 is connected

with 50

Ω coaxial cables to an oscilloscope to measure the outputs. J1 is left disconnected so that the output is

when disabled. Both outputs are the same and only one is shown.

Differential Z-out

The standard EVM is used with R15 and R17 = 24.9

Ω, and R16 = open. A network analyzer is connected to the

output of the EVM at J3 with 50

Ω coaxial cable, both inputs are terminated with a 50Ω load, and a

high-impedance differential probe is used for the measurement. The analyzer is set to measure the forward

transfer function (s21). The analyzer with probe input is calibrated across the open resistor pads of R16 and the

signal is measured at the output pins of the device. The output impedance is calculated using the known resistor

values and the attenuation caused by R15 and R17.

Output Balance Error

The standard EVM is used with R15 and R17 = 100

Ω, and R16 = 0Ω. A network analyzer is connected to the

input of the EVM with 50

Ω coaxial cable, the output is left open, and a high-impedance differential probe is used

for the measurement. The analyzer is set to measure the forward transfer function (s21). The analyzer with probe

input is calibrated at the input pins of the device and the signal is measured from the shorted pads of R16 to

ground.

Common-Mode Rejection

The standard EVM is used with T1 removed and jumpers place across terminals 3 to 4, 1 to 6, and 1 to 3. A

network analyzer is connected to the input and output of the EVM with 50

Ω coaxial cable and set to measure the

forward transfer function (s21).

The standard EVM is used with T2 removed and jumpers across terminals 3 to 4 and 1 to 6; R10, R15, and

R17 = 49.9

input of the EVM at J7 and output of the EVM with 50

Ω coaxial cable, and set to measure the forward transfer

function (s21). The input signal frequency is swept with the signal level set for 200mV. Each output at J3 and J4

is measured as single-ended, and because both are the same, only one output is shown.

The standard EVM is used with T2 removed and jumpers across terminals 3 to 4 and 1 to 6; R10, R15, and

R17 = 49.9

Ω; C9 and C13 = 0Ω; and C3, C4, R9, R16, and R21 = open. A waveform generator is connected to

50

Ω coaxial cable to an oscilloscope to measure the outputs. J1 is left disconnected so that the output is driven

Input/Output Voltage Noise, Settling Time, and Power-Supply Rejection

These parameters are taken from simulation.

Copyright

© 2010–2012, Texas Instruments Incorporated

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Product Folder Link(s): THS770012