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AV02-2236EN - July 9, 2013

AMMP-6640 Biasing and Operation

The AMMP-6640 attenuator is driven by voltage ramps

placed on Vseries and Vshunt control pins. Operation in

this mode requires voltages between 0 to 1.5 volts for Vse

and 0 to 1.5 volts for Vsh. The recommended DC control

voltage range is Vse = 0 to 1.2 volts and Vsh = 0 to 1.2

volts. A simplified schematic for the AMMP-6640 is shown

in Figure 17.

In the minimum attenuation state, the series FETs are

fully biased at 1.2 volts and the shunt FETs are in the full

“off” state at 0 volts. Inversely, for a maximum attenuation

state, the series FETs are “off” at 0 volts bias and the shunt

FETs are fully on at 1.2 volts. Achieving attenuation levels

in-between these two states requires voltage levels similar

to those in Table 4. Applying voltage to the shunt FETs sets

the source to drain resistance and establishes the main

attenuation level. The match is optimized by the amount

of bias applied to the series FETs.The match will determine

how flat the attenuation level is across a broadband

operational range.

Figure 17. AMMP-6640 Schematic

NC

NC

NC

NC

1

2

3

7

6

5

8

4

Package

Base

Ground

0.1

µF

0.1

µF

Ordering Information

Part Number

Devices Per Container

Container

AMMP-6640-BLKG

10

Antistatic bag

AMMP-6630-TR1G

100

7” Reel

AMMP-6630-TR2G

500

7” Reel

Package Dimension, PCB Layout and Tape and Reel

information

Please refer to Avago Technologies Application Note 5520,

AMxP-xxxx production Assembly Process (Land Pattern A).

Table 4. AMMP-6640 Typical Control Voltages

Attenuation (dB)

Vseries (V)

Vshunt (V)

0

1.2

0

2

0.440

0.325

4

0.435

0.383

6

0.430

0.416

8

0.420

0.440

10

0.410

0.465

12

0.400

0.480

14

0.385

0.505

16

0.375

0.535

18

0.360

0.575

20

0.350

0.650

22

0.346

0.845

max

0

1.2