SL3522CMC datasheet(4/21 Pages) ZARLINK

Il numero della parte	SL3522CMC

Spiegazioni elettronici	500MHz 75dB Logarithmic/Limiting Amplifier

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Produttore elettronici	ZARLINK [Zarlink Semiconductor Inc]

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4

SL3522

Fig.4 Plot showing guaranteed dynamic range v. frequency

(typical achievable dynamic range lines indicated across temperature)

PRODUCT DESCRIPTION

The SL3522 is a complete monolithic successive detection

Log/limiting amplifier which can operate over an input

frequency range of 100MHz to 500MHz. Producing a log/lin

characteristic for input signals between -64dBm and +6dBm,

the log amplifier can provide an accuracy of better than

±1.00dB at case temperatures of -55°C and +25°C and an

accuracy of better than

±1.25dB at +125°C. The dynamic

range is better than 75dB over a frequency range of 100MHz

to 400MHz. The graph in fig 4 shows how the dynamic range

is guaranteed over frequency.

The SL3522 consists of 6 Gain stages, 7 Detector stages,

a limiting RF Output buffer and a Video Output amplifier. The

power supply connections to each section are isolated from

each other to aid stability.

The SL3522 consumes 1.1W of power when ALL parts of

the circuit are powered up from a

±5.0V power supply. As the

circuit uses a differential architecture, the power consumption

of the RF gain/detector stages and RF Output Buffer will be

independent of RF input signal level. However, the Video

Output (pin 13) is driven by a single ended emitter follower and

so the power consumption of the Video amplifier will vary with

RF input signal level between pins 27 and 28.(upto 10mA over

2V video output range with max video load of 200

Ω //20pF) The

SL3522 has a high RF gain (>50dB) across a wide bandwidth

(>450MHz) when the limiting RF Output Buffer is enabled. The

limiting RF Output Buffer provides a balanced Limited Output

level of nominally –1.0dBm on each RF Output connection (pin

9 and 10), for RF input signal levels on pins 27 and 28 in excess

of –50dBm.

The limiting RF Output Buffer can be isolated from the

other sections of the SL3522, by disconnecting the RF Output

Buffer GND (pin 8) from 0V, and leave the pin floating. This

feature aids stability in applications NOT requiring a Limited RF

Output signal, and lowers the power consumption of the

SL3522 to 0.95Watts, when the other sections are powered up

from a

±5.0V power supply.

Each of the Gain and Detector stages has approximately

12dB of gain, and a significant amount of on-chip RF

decoupling (200pF per stage), also to aid stability. The Video

amplifier provides a positive going output signal proportional to

the log of the amplitude of an RF input applied between pins 27

and 28. The gain and the offset of the Video amplifier can be

adjusted by 3 resistors; RG , RT , and RO which are connected

to Gain adjust (pin 19),Trim reference (pin 18) and Offset

adjust (pin 17). With RT set to 1.5kΩ , RG can be set to any value

between 1k

Ω and 2k2Ω and achieve a range in Video Slope of

±20%, centred on 21mV/dB. Similarly, R

O can be set to any

value between 1k

Ω and 2.2KΩ and achieve an offset range of

±0.5V, which should allow the Video Offset to be trimmed to 0V

if required.

The RF input pins (27 and 28) have a 50

Ω terminating

resistor connected between them on–chip. These are

capacitively coupled to the I/P gain stage with 20pF on-chip

capacitors. (Refer to APPLICATION NOTES section for

information on how to connect an RF input signal to the device).

0

10

20

30

40

50

60

70

80

90

100

200

300

400

500

600

700

800

+125

°C

–55

°C

+25

°C

Minimum

guaranteed

dynamic

range (dB)”

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