XWM2152CDT/V Просмотр технического описания (PDF) - Wolfson Microelectronics plc

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XWM2152CDT/V

12-bit, 30MSPS ADC

Wolfson Microelectronics plc 

WM2152

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(e) Mode 3 - single-ended with offset: as (d), but now VINP is held constant, and VINM is a

negative going signal with respect to VINP.

Note:

(i)

In all cases, the effective input signal is VINP - VINM.

(ii)

The input has excellent common-mode rejection, so VINM and VINP may be placed

anywhere between AVDD1 and AGND1.

(iii)

The above full-scale ranges assume the nominal internally generated ADC reference

voltages, i.e. VRT-VRB = 1V. If externally applied references are used, and VRT-VRB is

not 1V, the full-scale ranges will scale accordingly. E.g. in case (a) above, if VRT-VRB is

0.8V, zero scale will occur at VINP=VINM-0.8V, full scale at VINP=VINM+0.8V.

4095

4095

1V

1V

1V

VINP

Input voltages

(a) MODE 1, CON[1:0] = 01

4095

2V

VINM

1V

Input voltages

(b) MODE 1, CON[1:0] = 01

VINP

Input voltages

(c) MODE2, CON[1:0] = 10

4095

1V

4095

1V

Input voltages

(d) MODE3, CON[1:0] = 11

Input voltages

(e) MODE3, CON[1:0] = 11

Figure 6 Input voltage ranges

PP Rev 1.2 August 2001

9

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