Rainbow-electronics MAXQ3120 Manual de usuario descargar pdf (Pagina 3)

MAXQ3120

High-Precision ADC

Mixed-Signal Microcontroller

_____________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(DV

, AV

= V

RST

to 3.6V, V

REF

= 1.25V (external), f

HFXIN

= 8MHz, T

= -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

Analog Supply Voltage AV

= DV

2.8 3.3 3.6 V

Active Analog Supply Current I

AVDD

Normal operation

2.65

3.5 mA

Power-Down Analog Supply

Current

APD2:0 = 111b

250 635

µA

ANALOG-TO-DIGITAL CONVERTER DC ACCURACY

ADC Resolution

No missing codes, with software lowpass

filter (see Appendix A)

16 bits

Offset Error Gain = 1

±5.0

Gain Error Gain = 1

±5.0

Gain-Error Drift

±10

ppm

Gain-Error Match

±0.5

DC Power-Supply Rejection PSRR

AN0+, AN0- = AGND; AV

= 3.0V to 3.6V

80 dB

ANALOG-TO-DIGITAL CONVERTER DYNAMIC SPECIFICATIONS

= 3.3V, AV

= 3.3V, AN0 = 25mV,

peak-to-peak sine wave at 65Hz, gain = 16

48 57

With software lowpass filter, cutoff at 21st

harmonic (see Appendix A)

Signal-to-Noise Ratio SNR

With software lowpass filter, cutoff at 7th

harmonic (see Appendix A)

Total Harmonic Distortion THD

= 3.3V, AV

= 3.3V, AN0 = 25mV,

peak-to-peak sine wave at 65Hz, gain = 16

(up to 21st harmonic)

-79 -55 dB

ANALOG-TO-DIGITAL CONVERTER INPUTS

Input-Voltage Range AN0+, AN0-; AN1+, AN1- to AGND -1 +1 V

Gain = 1 1

Input Sampling Capacitance

(Note 3)

Channel 0

Gain = 16 16

Input Sampling Rate f

(Note 4)

1.33

MHz

Sample Output Rate

HFXIN

384

sample

/ sec

Gain = 1

750

Input Impedance to AGND

(Note 5)

Gain = 16 46

kΩ

Gain = 1

1500

Differential Input Impedance

(Note 6)

Gain = 16 93

kΩ

Input Bandwidth (-3dB) 5.5 kHz

Reference Input Voltage V

REF

1.2

1.25

1.3 V

Reference Input Sampling

Capacitance

2pF

Reference Input Sampling Rate f

1.33

MHz

1 2 3 4 5 6 7 8 ... 32 33

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Rainbow-electronics MAXQ3120 Manual de usuario Pagina 3

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