DSPIC33EP128GS708 datasheet(345/484 Pages) MICROCHIP

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DS70005258C-page 345

dsPIC33EPXXXGS70X/80X FAMILY

25.0 PROGRAMMABLE GAIN

AMPLIFIER (PGA)

The dsPIC33EPXXXGS70X/80X family devices have

two Programmable Gain Amplifiers (PGA1, PGA2).

The PGA is an op amp-based, non-inverting amplifier

with user-programmable gains. The output of the PGA

can be connected to a number of dedicated Sample-

and-Hold inputs of the Analog-to-Digital Converter and/

or to the high-speed analog comparator module. The

PGA has five selectable gains and may be used as a

ground referenced amplifier (single-ended) or used

with an independent ground reference point.

Key features of the PGA module include:

• Single-Ended or Independent Ground Reference

• Selectable Gains: 4x, 8x, 16x, 32x and 64x

• High Gain Bandwidth

• Rail-to-Rail Output Voltage

• Wide Input Voltage Range

FIGURE 25-1:

PGAx MODULE BLOCK DIAGRAM

Note 1: This

data

sheet

summarizes

the

features of the dsPIC33EPXXXGS70X/

80X family of devices. It is not intended

to be a comprehensive reference source.

To complement the information in this data

sheet, refer to “Programmable Gain

Amplifier (PGA)” (DS70005146) in the

“dsPIC33/PIC24 Family Reference Man-

ual”, which is available from the Microchip

website (www.microchip.com).

2: Some registers and associated bits

described in this section may not be

available on all devices. Refer to

Section 4.0 “Memory Organization” in

this data sheet for device-specific register

and bit information.

GAIN<2:0> = 6

Gain of 64x

GAIN<2:0> = 5

GAIN<2:0> = 4

GAIN<2:0> = 3

GAIN<2:0> = 2

AMPx

–

PGACAL<5:0>

PGAx Negative Input

PGAx Positive Input

Gain of 32x

Gain of 16x

Gain of 8x

Gain of 4x

PGAxOUT

Note 1: x = 1 and 2.

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