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4.3 Programmable Gain Amplifier (PGA) Performance Specifications

It should be noted that the PGA and LPF in the receive path must be AC coupled to avoid problems with ampli-

fying any offsets.

Both the PGA and the amplifiers are specified in terms of the silicon only. This is to allow the system design to

be more flexible. The appendices show how to convert some of the silicon specs to system specs.

Figure 3. Power Supply Rejection of the Power Amplifier

1

<1>This is a nominal specification. 6 dB of margin should be added to arrive at a worst case spec.

Table 5. PGA performance Specifications

Unless otherwise specified, NOM specifications apply for VCC=5.0V, temperature range outlined in Table 4.4,

and worst case process and bias current and a minimum load of 440 W.

DESCRIPTION

MIN

NOM

MAX

UNITS

COMMENTS

D=00

D=01

D=10

D=11

11.4

1.4

-5.6

-19.8

11.8

1.8

-5.2

-19.2

12.2

2.2

-4.8

-18.8

dB

dB

dB

dB

Where ‘D’ is the binary value

of the control word

[PGA1, PGA0]

Gain settings are from the pin

PGAIN to pin PGAOUT (See

‘application diagram’)

WDB (PAOUT)

-40

-60

-80

-100

3.00e+04

1.00e+05

6.00e+05

Hz

dB