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LT5524

Low Distortion IF Amplifier/ADC Driver with Digitally Controlled Gain

Linear Technology 

LT5524

PI FU CTIO S

EN (Pin 1): Enable Pin for Amplifier. When the input

voltage is higher than 3V, the amplifier is turned on. When

the input voltage is less than or equal to 0.6V, the amplifier

is turned off. This pin is internally pulled to ground if not

connected.

VCC1 (Pin 2): Power Supply. This pin is internally connected

to VCC2 (Pin 19). Decoupling capacitors (1000pF and 0.1µF

for example) may be required in some applications.

GND (Pins 3, 4, 7, 8, 13, 14, 17, 18): Ground.

IN+ (Pin 5): Positive Signal Input Pin with Internal DC

Bias.

IN– (Pin 6): Negative Signal Input Pin with Internal DC

Bias.

PGA0 (Pin 9): Amplifier PGA Control Input Pin for the 1.5dB

Attenuation Step (see Programmable Gain table). Input is

high when the input voltage is greater than 3V. Input is low

when the input voltage is less than or equal to 0.6V. This

pin is internally pulled to ground if not connected.

PGA1 (Pin 10): Amplifier PGA Control Input Pin for the 3dB

Attenuation Step (see Programmable Gain table). Input is

high when the input voltage is greater than 3V. Input is low

when the input voltage is less than or equal to 0.6V. This

pin is internally pulled to ground if not connected.

PGA2 (Pin 11): Amplifier PGA Control Input Pin for the 6dB

Attenuation Step (see Programmable Gain table). Input is

high when the input voltage is greater than 3V. Input is low

when the input voltage is less than or equal to 0.6V. This

pin is internally pulled to ground if not connected.

PGA3 (Pin 12): Amplifier PGA Control Input Pin for 12dB

Attenuation Step (see Programmable Gain table). Input is

high when the input voltage is greater than 3V. Input is low

when the input voltage is less than or equal to 0.6V. This

pin is internally pulled to ground if not connected.

OUT+ (Pin 15): Positive Amplifier Output. A transformer

with center tap tied to VCC or a choke inductor is recom-

mended to source the DC quiescent current.

OUT– (Pin 16): Negative Amplifier Output. A transformer

with center tap tied to VCC or a choke inductor is recom-

mended to source the DC quiescent current.

VCC2 (Pin 19): Power Supply. This pin is internally con-

nected to VCC1 (Pin 2).

NC (Pin 20): Not Connected.

Exposed Pad (Pin 21): Ground. This pin must be soldered

to the printed circuit board ground plane for good heat

transfer.

BLOCK DIAGRA

LT5524

IN+

5

6 IN–

ATTENUATOR

RIN

100Ω

AMPLIFIER

OUT–

16

OUT+

15

VOLTAGE REGULATOR

AND BIAS

GAIN CONTROL

LOGIC

ENABLE

CONTROL

GND (3, 4, 7, 8

13, 14, 17, 18)

VCC1 VCC2

2 19

PGA3 PGA2 PGA1 PGA0

12 11 10 9

Figure 1. Functional Block Diagram

NC EN

20 1

21

5524 F01

5524f

7

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