THS1030

3V TO 5.5V, 10BIT, 30 MSPS

CMOS ANALOGTODIGITAL CONVERTER

SLAS243E − NOVEMBER 1999 − REVISED DECEMBER 2003

22

POST OFFICE BOX 655303

PRINCIPLES OF OPERATION

operating configuration examples (continued)

AIN

REFTS

REFBS

REFTF

REFBF

REFSENSE

MODE

1.4 V

0.6 V

0.1

µF

10

µF

0.1

µF

0.1

µF

VREF = 1.6 V

RA

RB

1 V

1.4 V

0.6 V

1 V

AIN+

AIN−

AVDD

2

Figure 25. Differential Operation

Figure 26 shows a center span configuration for an input waveform swinging between 0.2 V and 1.9 V. Pins

REFTS and REFBS are connected to a voltage source of 1.05 V, equal to the mid-scale of the input waveform.

REFTF−REFBF should be set equal to the span of the input waveform, 1.7 V, so VREF is connected to an

Figure 23) to allow this external source to be applied.

AIN

REFTS

REFBS

REFTF

REFBF

REFSENSE

MODE

1.9 V

0.2 V

0.1

µF

10

µF

0.1

µF

0.1

µF

1.05 V

DC SOURCE = 1.05 V

VREF

DC SOURCE = 1.7 V

AVDD

AVDD

2

Figure 26. Center Span Operation