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ADS1299-4: Analog Inputs Range

Manoj Chate
Prodigy 180 points

Part Number: ADS1299-4

Hi team,

I want to configure ADS1299-4 in Fully Differential mode with common mode voltage at 0V [(AVDD + AVSS) / 2]. AVDD = 2.5V and AVSS = -2.5V.

I'm using internal Vref = 4.5V with VREFN = AVSS = -2.5V. 

With this VREFP = AVSS + 4.5 = 2V

               VREFN = AVSS = -2.5V

So , as per datasheet section 9.3.1.2 Analog Input , differential input range can span from  –VREF / gain to VREF / gain . If I consider PGA Gain = 1 , does that mean my input range will be from -4.5V to +4.5V [9V swing].

Ans similarly if PGA Gain = 2 ,   does that mean my input range will be from -2.25V to +2.25V.

Or  is it a typo error and should be like –VREFN / gain to VREFP / gain ? so that for PGA Gain =1 , it will be like , -2.5V to +2V ?

Please suggest

Thank You