lt5554 Linear Technology Corporation, lt5554 Datasheet

lt5554

Manufacturer Part Number

lt5554

Description

Broadband Ultra Low Distortion 7-bit Digitally Controlled Vga

Manufacturer

Linear Technology Corporation

Datasheet

1.LT5554.pdf (32 pages)

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FEATURES

APPLICATIONS

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

TYPICAL APPLICATION

INPUT

1GHz Bandwidth at all Gains

48dBm OIP3 at 200MHz, 2V

–88dBc IMD3 at 200MHz, 2V

1.4nV/√Hz Input-Referred-Noise (RTI)

20dBm Output P1dB at 70MHz, R

2dB to 18dB Gain Range (R

0.125dB Gain Step Size

30ps Group Delay Variation

5ns Fast Gain Settling Time

5ns Fast Overdrive Recovery

–80dB Reverse Isolation

Differential ADC Driver

IF Sampling Receivers

VGA IF Power Ampliﬁ er

50Ω Driver

Instrumentation

OUT

= 100Ω

BPF

AMPLIFIER

0.1μF

DEC

OUT

P-P

into 50Ω,

= 50Ω)

into 50Ω,

DEC

OUT

–

MODE

–

= 130Ω

7 BITS

LT5554

PGx GAIN CONTROL

STROBE

BPF

DESCRIPTION

The LT

gain (PG) ampliﬁ er with 16dB gain control range. It

consists of a 50Ω input variable attenuator, followed by

a high linearity variable transconductance ampliﬁ er. The

coarse 4dB input attenuator step is implemented via 2-bits

of digital control (PG5, PG6). The ﬁ ne transconductance

ampliﬁ er 0.125dB step within 3.875dB gain control range

is set via 5-bits digital control (PG0 to PG4). The LT5554

gain control inputs (PGx) and the STROBE input can be

directly coupled to TTL or ECL drivers. The seven parallel

gain control inputs time skew can be eliminated by using

the STROBE input positive transition.

The internal output resistor R

mum overall gain to 36dB for open outputs. The internal

circuitry of open output collectors enables the LT5554 to

be unconditionally stable over any loading conditions (in-

cluding external SAW ﬁ lters) and provides –80dB reverse

isolation at 300MHz.

The LT5554 is internally protected during overdrive and

has an on-chip power supply regulator.

With 0.125dB step resolution and 5ns settling time, the

LT5554 is suitable in applications where continuous gain

control is required.

ADC

5554 is a 7-bit digitally controlled programmable

Distortion 7-Bit Digitally

Broadband Ultra Low

5554 TA01

132

130

128

126

Controlled VGA

OIP3 and SFDR vs Frequency

OUT

= 50Ω

= 400Ω limits the maxi-

FREQUENCY (MHz)

SFDR

OIP3

100

LT5554

150

5554 TA01b

200

5554f

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