MX7705_09 datasheet(11/33 Pages) MAXIM

Part #	MX7705

Description	16-Bit, Low-Power, 2-Channel, Sigma-Delta ADC

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Manufacturer	MAXIM [Maxim Integrated Products]

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16-Bit, Low-Power, 2-Channel,

Sigma-Delta ADC

______________________________________________________________________________________

11

Table 4. Peak-to-Peak Resolution vs. Gain and Output Data Rate (VDD = 3V)

TYPICAL PEAK-TO-PEAK RESOLUTION (BITS)

GAIN

FILTER FIRST

NOTCH AND

OUTPUT DATA RATE

-3dB FREQUENCY

1

2

4

8

16

32

64

128

BUFFERED (fCLKIN = 1MHz)

20Hz

5.24Hz

16

15

14

13

12

25Hz

6.55Hz

16

15

14

13

12

100Hz

26.2Hz

12

11

200Hz

52.4Hz

10

9

UNBUFFERED (fCLKIN = 1MHz)

20Hz

5.24Hz

16

15

14

13

12

25Hz

6.55Hz

16

15

14

13

12

100Hz

26.2Hz

12

14

12

11

200Hz

52.4Hz

10

9

BUFFERED (fCLKIN = 2.4576MHz)

50Hz

13.1Hz

16

15

14

13

12

60Hz

15.72Hz

16

15

14

13

12

250Hz

65.5Hz

12

11

500Hz

131Hz

10

11

10

9

UNBUFFERED (fCLKIN = 2.4576MHz)

50Hz

13.1Hz

16

15

14

13

12

60Hz

15.72Hz

16

15

14

13

12

250Hz

65.5Hz

12

11

500Hz

131Hz

10

9

TYPICAL OUTPUT NOISE

READING NUMBER

1600

1200

800

400

32758

32760

32762

32764

32766

32768

32770

32772

32774

32776

32756

0

2000

VDD = 5V,

VREF = 2.5V

GAIN = 128

ODR = 60Hz

RMS NOISE = 1.3

μV

HISTOGRAM OF TYPICAL OUTPUT NOISE

CODE

100

200

300

400

0

VDD = 5V, VREF = 2.5V

GAIN = 128

ODR = 60Hz

RMS NOISE = 1.3

μV

OFFSET ERROR vs. SUPPLY VOLTAGE (3V)

SUPPLY VOLTAGE (V)

3.45

3.30

3.15

3.00

2.85

-0.0010

-0.0005

0

0.0005

0.0010

0.0015

-0.0015

2.70

3.60

VDD = 3V

Typical Operating Characteristics

(VDD = 3V or 5V, VREF+ = 1.225V for VDD = 3V, VREF+ = 2.5V for VDD = 5V, VREF- = GND, TA = +25°C, unless otherwise noted.)

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