MIC3000BML datasheet(15/68 Pages) MICREL

15 / 68 page

October 2004

M9999-101204

MIC3000

Micrel

ADC Resolution

Channel

(bits)

Conditions

Input Range (V)

LSB(1)

TEMP

N/A

1°C

VAUX

See Table 6

VMPD

GAIN = 0; BIASREF = 0

GNDA – VREF

4.77mV

GAIN = 0; BIASREF = 1

VDDA – (VDDA – VREF)

GAIN = 1; BIASREF = 0

GNDA – VREF/4

1.17mV

GAIN = 1; BIASREF = 1

VDDA – (VDDA – VREF/4)

VILD

VILD– = VDDA

VDDA – (VDDA – VREF)

4.77mV

VILD– = GNDA

GNDA – VREF

VRX

n/a

0 – VREF

4.77mV

Table 5. A/D Input Signal Ranges and Resolutions

Note:

1. Assumes typical VREF value of 1.22V.

Channel

VAUX[2:0]

Input Range (V)

LSB(1) (mV)

VIN

000 = 00h

0V to 5.5V

25.6mV

VDDA

001 = 01h

0V to 5.5V

25.6mV

VBIAS

010 = 02h

0V to 5.5V

25.6mV

VMOD

011 = 03h

0V to 5.5V

25.6mV

APCDAC

100 = 04h

0V to VREF

4.77mV

MODDAC

101 = 05h

0V to VREF

4.77mV

FLTDAC

110 = 06h

0V to VREF

4.77mV

Table 6. VAUX Input Signal Ranges and Resolutions

Note:

1. Assumes typical VREF value of 1.22V.

VILD–

TEMP

SENSOR

VAUX[2:1]

FLTDAC

MODDAC

APCDAC

VBIAS

VMOD

VDDA

VIN

VILD+

VRX

VMPD

7-CH

MUX

5-CH

MUX

TEMP

SENSOR

SIGMA-DELTA ADC

Figure 2. Analog-to-Digital Converter Block Diagram

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