Rainbow Electronics MAXQ3120 - Manual (Page 3)

MAXQ3120
High-Precision ADC
Mixed-Signal Microcontroller
_____________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(DV DD , AV DD = V RST to 3.6V, V REF = 1.25V (external), f HFXIN = 8MHz, T A = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Analog Supply Voltage AV DD AV DD = DV DD 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 mV
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 DD = 3.0V to 3.6V 80 dB
ANALOG-TO-DIGITAL CONVERTER DYNAMIC SPECIFICATIONS
DV DD = 3.3V, AV DD = 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)
71 Signal-to-Noise Ratio SNR
With software lowpass filter, cutoff at 7th
harmonic (see Appendix A)
74
dB
Total Harmonic Distortion THD
DV DD = 3.3V, AV DD = 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)
C IN Channel 0
Gain = 16 16
pF
Input Sampling Rate f S (Note 4) 1.33 MHz
Sample Output Rate
f HFXIN /
384
sample
/ sec
Gain = 1 750 Input Impedance to AGND
(Note 5)
Gain = 16 46
k Ω
Gain = 1 1500 Differential Input Impedance
(Note 6)
Gain = 16 93
k Ω
Input Bandwidth (-3dB) 5.5 kHz
Reference Input Voltage V REF 1.2 1.25 1.3 V
Reference Input Sampling
Capacitance
2 pF
Reference Input Sampling Rate f S 1.33 MHz