THS1041CPWR datasheet(20/42 Pages) TI1

20 / 42 page

THS1041

SLAS289C − OCTOBER 2001 − REVISED OCTOBER 2004

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PRINCIPLES OF OPERATION

onboard reference generator configuration

The internal bandgap reference A1 can provide a supply-voltage-independent and temperature-independent

voltage on pin VREF.

External connections to REFSENSE control A1’s output to the VREF pin as shown in Table 1.

Table 1. Effect of REFSENSE Connection on VREF Value

REFSENSE CONNECTION

A1 OUTPUT TO VREF

REFER TO:

VREF pin

0.5 V

Figure 30

AGND

1 V

Figure 31

External divider junction

(1 + Ra/Rb)/2 V

Figure 32

AVDD

Open circuit

Figure 33

REFSENSE = AVDD powers the internal bandgap reference A1 down, saving power when A1 is not required.

If MODE is connected to AVDD or AVDD/2, then the voltage at VREF determines the ADC reference voltages:

REFT

) VREF

REFB

* VREF

REFT–REFB

+ VREF

VBG

ADC

References

Buffer A2

MODE =

REFSENSE

0.1

µF 1 µF

AGND

VREF = 0.5 V

AVDD

or AVDD

Figure 30. 0.5-V VREF Using the Internal Bandgap Reference A1

(10)

(11)

(12)

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