Datasheet > SL531CCM

SL531CCM

更新时间： 2024-11-19 21:54:43

品牌	Logo	应用领域
其他 - ETC		放大器
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4页	97K
描述
250MHz TRUE LOG IF AMPLIFIER

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SL531CCM 数据手册

ADVANCE INFORMATION

DS3608 - 2.0

SL531

250MHz TRUE LOG IF AMPLIFIER

The SL531 C is a wide band amplifier designed for use in

logarithmic IF amplifiers of the true log type. The input and log

output of a true log amplifier are at the same frequency i e

detection does not occur. In successive detection log

amplifiers (using SL521 SL1521 types) the log output is

detected.

The small signal gain is 10dB and bandwidth is over

500MHz. At high signal levels the gain of a single stage

dropstounity. A cascade of such stages give a close

approximation to a log characteristic at centre frequencies

between 10and 200MHz.

CM8

An important feature of the device is that the phase shift is

nearly constant with signal level. Thus any phase information

on the input signal is preserved through the strip.

The device is also available as the 5962-92084 which has

guaranteed operation over the full Military Temperature

Range and is screened to MIL-STD-883 Class B. Data is

available separately

Fig.1 Pin connections

FEATURES

■

Low Phase Shift vs Amplitude

On-Chip Supply Decoupling

Low External Components Count

APPLICATIONS

True Log Strips with:-

Log Range

Centre frequencies

Phase Shift

■

70dB

10 - 200MHz

± 0.5 degrees / 10dB

Fig.2 Circuit diagram

ABSOLUTE MAXIMUM RATINGS

(Non-simultaneous)

Supply voltage

Storage temperature range

+12 volts

-65°C to +150°C

Operating temperature range

-55°C to +125°C

See operating notes

175°C

Max junction temperature

Junction - ambient thermal resistance

220°C/Watt

Junction - case thermal resistance

80°C/Watt

CIRCUIT DESCRIPTION

Fig.3 Block diagram

The SL531 transfer characteristic has two regions For small

inputsignalsithasanominalgainof10dB. atlargesignalsthe

gain falls to unity (see Fig 7) This is achieved by operating a

limiting amplifier and a unity gain amplifier in parallel (see Fig

3) Tr1 and Tr4 comprise the long tailed pair limiting amplifier,

the tail current being supplied byTrS, see Fig 2 Tr2 and Tr3

form the unity gain amplifier the gain of which is defined by the

emitterresistorsTheoutputsofbothstagesaresummedinthe

300 ohm resistor and Tr7 acts as an emitter follower output

buffer. Important features are the amplitude and phase

linearity of the unity gain stage which is achieved by the use

of 5GHz transistors with carefully optimised geometries.

ORDERING INFORMATION

5962-92084 (SMD)

SL531 C CM

12 3 4

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