EVAL-ADUC7060QSPZ【PDF 34/100 页】KIT DEV QUICK START ADUC7060

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ADuC7060

Table 34. Primary ADC—Typical Output RMS Noise in Normal Mode (μV)

ADC

Data

Input Voltage Noise (mV)

Register

Update

±1.2 mV

±600 mV

±300 mV

±150 mV

±75 mV

±37.5 mV

±18.75 mV

±9.375 mV

±4.68 mV

±2.34 mV

Status

Rate

(PGA = 1)

(PGA = 2) (PGA = 4)

(PGA = 8) (PGA = 16)

(PGA = 32) (PGA = 64)

(PGA = 128)

(PGA = 256) (PGA = 512)

Chop On

Chop Off

Chop Off

Chop Off

4 Hz

50 Hz

1 kHz

8 kHz

0.62 μV

1.97 μV

8.54 μV

54.97 μV

0.648 μV

1.89 μV

8.4 μV

55.54 μV

0.175 μV

0.570 μV

2.55 μV

14.30 μV

0.109 μV

0.38 μV

1.6 μV

7.88 μV

0.077 μV

0.27 μV

1.17 μV

4.59 μV

0.041 μV

0.147 μV

0.658 μV

2.5 μV

0.032 μV

0.123 μV

0.53 μV

1.71 μV

0.0338 μV

0.12 μV

0.55 μV

1.75 μV

0.032 μV

0.098 μV

0.56 μV

0.915 μV

0.033 μV

0.098 μV

0.52 μV

0.909 μV

Table 35. Primary ADC—Typical Output RMS Effective Number of Bits in Normal Mode (Peak-to-Peak Bits in Parentheses)

ADC

Data

Input Voltage Noise (mV)

Register

Status

Chop On

Chop Off

Chop Off

Chop Off

Update

Rate

4 Hz

50 Hz

1 kHz

8 kHz

±1.2 V

(PGA = 1)

21.9

(19.1 p-p)

20.2

(17.5 p-p)

18.1

(15.3 p-p)

15.4

(12.7 p-p)

±600 mV

(PGA = 2)

20.8

(18.1 p-p)

19.3

(16.6 p-p)

17.1

(14.4 p-p)

14.4

(11.7 p-p)

±300 mV

(PGA = 4)

21.7

(19.0 p-p)

20.0

(17.3 p-p)

17.8

(15.1 p-p)

15.4

(12.6 p-p)

±150 mV

(PGA = 8)

21.4

(18.7 p-p)

19.6

(16.9 p-p)

17.5

(14.8 p-p)

15.2

(12.5 p-p)

±75 mV

(PGA = 16)

20.9

(18.2 p-p)

19.1

(16.4 p-p)

17.0

(14.2 p-p)

15.0

(12.3 p-p)

±37.5 mV

(PGA = 32)

20.8

(18.1 p-p)

19.0

(16.2 p-p)

16.8

(14.1 p-p)

14.9

(12.2 p-p)

±18.75 mV

(PGA = 64)

20.2

(17.4 p-p)

18.2

(15.5 p-p)

16.1

(13.4 p-p)

14.4

(11.7 p-p)

±9.375 mV

(PGA = 128)

19.1

(16.4 p-p)

17.3

(14.6 p-p)

15.1

(12.3 p-p)

13.4

(10.7 p-p)

±4.68 mV

(PGA = 256)

18.2

(15.4 p-p)

16.6

(13.8 p-p)

14.0

(11.3 p-p)

13.3

(10.6 p-p)

±2.34 mV

(PGA = 512)

17.1

(14.4 p-p)

15.5

(12.8 p-p)

13.1

(10.4 p-p)

12.3

(9.6 p-p)

Table 36. Auxilary ADC: Typical Output RMS Noise

Data

Similarly, if an external reference source of greater than 1.35 V

is used for ADC1, the HIGHEXTREF1 bit must be set in

ADC Register

Chop On

Chop On

Chop Off

Chop Off

Update Rate

4 Hz

10 Hz

1 kHz

8 kHz

RMS Value

0.633 μ V

0.810 μ V

7.4 μ V

54.18 μ V

ADC1CON.

Diagnostic Current Sources

To detect a connection failure to an external sensor, the ADuC7060

incorporates a 50 μA constant current source on the selected

analog input channels to both the primary and auxiliary ADCs.

Reference Sources

Both the primary and secondary ADCs have the option of using

the internal reference voltage or one of two external differential

reference sources. The first external reference is applied to the

VREF+/VREF? pins. The second external reference is applied

to the ADC4/EXT_REF2IN+ and ADC5/EXT_REF2IN? pins.

By default, each ADC uses the internal 1.2 V reference source.

For details on how to configure the external reference source for

The diagnostic current sources for the primary ADC analog

inputs are controlled by the ADC0DIAG[1:0] bits in the

ADC0CON register.

Similarly, the diagnostic current sources for the auxiliary ADC

analog inputs are controlled by the ADC1DIAG[1:0] bits in the

ADC0CON register.

the primary ADC, see the description of the ADC0REF[1:0] bits

in the ADC0 control register, ADC0CON.

For details on how to configure the external reference source for

AVDD

A

A

R1

B

B

ADC0 (+)

ADC1 (–)

VIN =

ADC0,

ADC1

the auxiliary ADC, see the description of the ADC1REF[2:0]

bits in the ADC1 control register, ADC1CON.

If an external reference source of greater than 1.35 V is needed

for ADC0, the HIGHEXTREF0 bit must be set in ADC0CON.

Rev. 0 | Page 34 of 100

R2

Figure 14. Example Circuit Using Diagnostic Current Sources

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