LT5554 datasheet(13/32 Pages) LINER

13 / 32 page

LT5554

5554f

PIN FUNCTIONS

GND (Pins 1, 2, 7, 8, 10, 13, 15, 16, 19, 22, 25, 26, 28,

31): Ground Pins.

DEC (Pins 3, 6): Decoupling Pin for the Internal DC Bias

Voltage for the Differential Inputs, IN+ and IN–. It is also

connected to the ‘virtual ground’ of the input resistive

attenuator. Capacitive de-coupling to ground is recom-

mended in order to preserve linearity performance when

IN+, IN– inputs are driven with up to 3dB imbalance.

IN+ (Pin 4):

Positive Signal Input Pin with Internal DC

Bias to 2V.

IN– (Pin 5):

Negative Signal Input Pin with Internal DC

Bias to 2V.

PG5 (Pin 9): 4dB Step Ampliﬁer Programmable Gain Con-

trol Input Pin. Input levels are controlled by MODE pin.

PG6 (Pin 11): 8dB Step Ampliﬁer Programmable Gain

Control Input Pin. Input levels are controlled by the

MODE pin.

PG0 (Pin 12): 0.125dB Step Ampliﬁer Programmable

Gain Control Input Pin. Input levels are controlled by

MODE pin.

STROBE (Pin 14): Strobe Pin for the Programmable Gain

Control Inputs (PGx). With STROBE in Low-state, the

Ampliﬁer Gain is not changed by PGx state changes (latch

mode). With STROBE in High-state, the Ampliﬁer Gain is

asynchronously set by PGx inputs transitions (transpar-

ent-mode). A positive STROBE transition updates the

PGx state. Low-state and High-state depends on MODE

pin level (Table1).

VCC (Pins 17, 24): Power Supply Pins. These pins are

internally connected together.

MODE (Pin 18): PGx and STROBE Functionality and Level

Control Pin. When MODE is higher than VCC – 0.4V, the

PGx and STROBE are DC-coupled. When the MODE pin

is lower than 0.6V, the PGx and STROBE are AC-coupled.

2dB-Step Response (PG4)

120MHz Signal

8dB-Step Response (PG6)

120MHz Signal

8dB-Step Response (PG6)

120MHz Pulse Signal

TYPICAL PERFORMANCE CHARACTERISTICS (R

OUT = 50Ω) TA = 25°C. VCC = 5V, VCCO = 5V,

ENB = 3V, MODE = 5V, STROBE = 3V, VIH = 2.2V, VIL = 0.6V (Test circuit shown in Figure 16), maximum gain, unless otherwise noted.

8dB-Step (PG6) 120MHz Pulse

Signal for 8dB Overdrive

8dB-Step (PG6) 120MHz

Sinusoidal Signal for 2dB

Overdrive

8dB-Step (PG6) 120MHz

Sinusoidal Signal for 8dB

Overdrive

MODE = HIGH

1V/DIV

5554 G49

5ns/DIV

MODE = HIGH

1V/DIV

5554 G50

5ns/DIV

MODE = HIGH

1V/DIV

5554 G51

10ns/DIV

MODE = HIGH

0.1V/DIV

5554 G46

10ns/DIV

MODE = HIGH

0.1V/DIV

5554 G47

10ns/DIV

MODE = HIGH

0.2V/DIV

5554 G48

5ns/DIV

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