LT6555

7

6555f

IN1A (Pin 1): Channel 1 Input A. This pin has a nominal

impedance of 400k

Ω and does not have any internal

termination resistor.

DGND (Pin 2): Digital Ground Reference for Enable Pin.

This pin is normally connected to ground.

IN2A (Pin 3): Channel 2 Input A. This pin has a nominal

impedance of 400k

Ω and does not have any internal

termination resistor.

is the tap to an internal voltage divider that defines mid-

supply. It is normally connected to ground in dual supply,

DC coupled applications.

IN3A (Pin 5): Channel 3 Input A. This pin has a nominal

impedance of 400k

Ω and does not have any internal

termination resistor.

AGND1 (Pin 6): Analog Ground for the 360

Ω Gain Resis-

tor of Channel 1.

IN1B (Pin 7): Channel 1 Input B. This pin has a nominal

impedance of 400k

Ω and does not have any internal

termination resistor.

AGND2 (Pin 8): Analog Ground for the 360

Ω Gain Resis-

tor of Channel 2.

IN2B (Pin 9): Channel 2 Input B. This pin has a nominal

impedance of 400k

Ω and does not have any internal

termination resistor.

AGND3 (Pin 10): Analog Ground for the 360

Ω Gain

Resistor of Channel 3.

IN3B (Pin 11): Channel 3 Input B. This pin has a nominal

impedance of 400k

Ω and does not have any internal

termination resistor.

ternally connected to each other and must all be connected

externally. Proper supply bypassing is necessary for best

performance. See the Applications Information section.

not internally connected to each other and must all be

connected externally. Proper supply bypassing is neces-

sary for best performance. See the Applications Informa-

tion section.

and must all be connected externally. Proper supply bypass-

ing is necessary for best performance. See the Applications

Information section.

OUT3 (Pin 16): Channel 3 Output. It is twice the selected

channel 3 input and performs optimally with a 150

Ω load

(a double terminated 75

Ω cable).

other and must all be connected externally. Proper supply

bypassing is necessary for best performance. See the

Applications Information section.

OUT2 (Pin 18): Channel 2 Output. It is twice the selected

channel 2 input and performs optimally with a 150

Ω load

(a double terminated 75

Ω cable).

other and must all be connected externally. Proper supply

bypassing is necessary for best performance. See the Ap-

plications Information section.

OUT1 (Pin 20): Channel 1 Output. It is twice the selected

channel 1 input and performs optimally with a 150

Ω load

(a double terminated 75

Ω cable).

and must all be connected externally. Proper supply

bypassing is necessary for best performance. See the

Applications Information section.

SEL (Pin 22): Select Pin. This high impedance pin selects

which set of inputs are sent to the output pins. When the

pin is pulled low, the A inputs are selected. When the pin

is pulled high, the B inputs are selected.

EN (Pin 23): Enable Control Pin. An internal pull-up

resistor of 46k defines the pin’s impedance and will turn

the part off if the pin is unconnected. When the pin is pulled

low, the amplifiers are enabled.

and must be soldered to the PCB. It is internally connected