Datasheet > LT5554

LT5554

更新时间： 2024-11-12 14:58:19

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
32页	604K
描述
宽带、超低失真、7 位数字控制型 VGA

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中文翻译

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LT5554 数据手册

LT5554

Broadband Ultra Low

Distortion 7-Bit Digitally

Controlled VGA

FEATURES

DESCRIPTION

The LT^®5554 is a 7-bit digitally controlled programmable

gain (PG) ampliﬁer with 16dB gain control range. It

consists of a 50Ω input variable attenuator, followed by

a high linearity variable transconductance ampliﬁer. The

coarse4dBinputattenuatorstepisimplementedvia2-bits

of digital control (PG5, PG6). The ﬁne transconductance

ampliﬁer 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.

1GHz Bandwidth at all Gains

48dBm OIP3 at 200MHz, 2V into 50Ω,

P-P

= 100Ω

OUT

–88dBc IMD3 at 200MHz, 2V into 50Ω,

OUT

P-P

= 100Ω

1.4nV/√Hz Input-Referred-Noise (RTI)

20dBm Output P1dB at 70MHz, R

= 130Ω

OUT

= 50Ω)

2dB to 18dB Gain Range (R

0.125dB Gain Step Size

OUT

30ps Group Delay Variation

5ns Fast Gain Settling Time

5ns Fast Overdrive Recovery

–80dB Reverse Isolation

The internal output resistor R = 400Ω limits the maxi-

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 ﬁlters) and provides –80dB reverse

isolation at 300MHz.

APPLICATIONS

Differential ADC Driver

IF Sampling Receivers

VGA IF Power Ampliﬁer

50Ω Driver

The LT5554 is internally protected during overdrive and

has an on-chip power supply regulator.

Instrumentation

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

trademarks are the property of their respective owners.

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

LT5554 is suitable in applications where continuous gain

control is required.

TYPICAL APPLICATION

OIP3 and SFDR vs Frequency

132

130

128

126

OUT

= 50Ω

MODE

0.1μF

OIP3

–

BPF

INPUT

DEC

LT5554

BPF

ADC

AMPLIFIER

–

7 BITS

0.1μF

DEC

5554 TA01

PGx GAIN CONTROL

STROBE

SFDR

0.1μF

100

FREQUENCY (MHz)

150

200

5554 TA01b

5554f

12 3 4 5 6 7...32

中文翻译

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与LT5554相关器件

型号	品牌	获取价格	描述	数据表
LT5554IUH#PBF	Linear	获取价格	LT5554 - Broadband Ultra Low Distortion 7-Bit Digitally Controlled VGA; Package: QFN; Pins
LT5554IUH#TRPBF	Linear	获取价格	LT5554 - Broadband Ultra Low Distortion 7-Bit Digitally Controlled VGA; Package: QFN; Pins
LT5554IUH-PBF	Linear	获取价格	Broadband Ultra Low Distortion 7-Bit Digitally Controlled VGA
LT5554IUH-TRPBF	Linear	获取价格	Broadband Ultra Low Distortion 7-Bit Digitally Controlled VGA
LT5557	Linear	获取价格	400MHz to 3.8GHz 3.3V High Signal Level Downconverting Mixer
LT5557	ADI	获取价格	400MHz 至 3.8GHz、3.3V 有源下变频混频器
LT5557EUF#PBF	Linear	获取价格	LT5557 - 400MHz to 3.8GHz 3.3V Active Downconverting Mixer; Package: QFN; Pins: 16; Temper
LT5557EUF#TR	Linear	获取价格	IC SPECIALTY TELECOM CIRCUIT, PQCC16, 4 X 4 MM, PLASTIC, MO-220, QFN-20, Telecom IC:Other
LT5557EUF#TRPBF	Linear	获取价格	LT5557 - 400MHz to 3.8GHz 3.3V Active Downconverting Mixer; Package: QFN; Pins: 16; Temper
LT5557EUF-PBF	Linear	获取价格	400MHz to 3.8GHz 3.3V High Signal Level Downconverting Mixer

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