7

LT1203/LT1205

TYPICAL PERFOR A CE CHARACTERISTICS

Channel 1 Disable

LT1203/05 • TPC19

Channel 1 Enable

LT1203/05 • TPC20

Input Protection

The logic inputs have ESD protection (

≥2kV) and short-

ing them to 12V or 15V will cause excessive current to

flow. Limit the current to less than 50mA when driving

the logic above 6V. The analog inputs are protected

against ESD and overvoltage with internal SCRs. For

inputs

≥±2.8V the SCRs will fire and the DC current

should be limited to 20mA.

Power Supplies

The LT1203/LT1205 will operate from

±5V (10V total) to

±15V (30V total) and is specified over this range. Charac-

teristics change very little over this voltage range. It is not

necessary to use equal value supplies however, the output

offset voltage will change. The offset will change about

300

µV per volt of supply mismatch. The LT1203/LT1205

have a very wide bandwidth yet are tolerant of power

supply bypassing. The power supplies should be by-

passed with a 0.1

µFor0.01µFceramiccapacitorwithin0.5

inch of the part.

Circuit Layout

Use a ground plane to ensure a low impedance ground is

available throughout the PCB layout. Separate the inputs

S

APPLICATI

I FOR ATIO

LT1203 Channel-to-Channel Switching Transient

with ground plane to ensure high channel separation. For

minimum peaking, maximum bandwidth and maximum

gain flatness sockets are not recommended because they

can add considerable stray inductance and capacitance. If

a socket must be used, use a low profile, low capacitance

socket such as the SamTec ISO-308.

Switching Transients

The LT1203/LT1205 use input buffers to ensure switching

transients do not couple to other video equipment sharing

the input line. Output switching transients are about

OUTPUT

50mV/DIV

INPUT

20mV/DIV

LOGIC

(PIN 5)

LT1203/05 • AI01

EN

(PIN 6)

(PIN 7)

(PIN 7)

EN

(PIN 6)