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MAXQ7667
16-Bit, RISC, Microcontroller-Based,
Ultrasonic Distance-Measuring System
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(VDVDDIO = +5V, VAVDD = +3.3V; VDVDD = +2.5V, system clock (fSYSCLK) = 16MHz, burst frequency (fBURST) = bandpass frequency
(fBPF) = 50kHz, CREFBG = CREF = 1F in parallel with 0.01F, fADCCLK = 2MHz (SAR data rate = 125ksps), TA = TMIN to TMAX, unless
otherwise specified. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
BANDPASS FILTER
Center Frequency
fBPF
25
100
kHz
Passband Width
-3dB
0.14 x fBPF
kHz
Minimum Stopband
Rejection
One decade away from center
frequency
-60
dB
Output Data Rate
10 x fBPF
ksps
Output Data Resolution
16
Bits
LOWPASS FILTER
Corner Frequency
fLPF
-3dB
0.1 x fBPF
kHz
Rolloff
40
dB/Decade
Output Data Rate
5 x fBPF
ksps
Output Data Resolution
16
Bits
SAR ADC
Measurement
12
Resolution
No missing codes
11
Bits
Integral Nonlinearity
Tested at 125ksps
±1
±2
LSB
Differential Nonlinearity
Tested at 125ksps
-2
+2
LSB
Offset Error
±1
±3
mV
Offset-Error Drift
±5
V/°C
Gain Error
±1
%
Gain-Error Temperature
Coefficient
±0.4
ppmFS/°C
Input-Referred Noise
At ADC inputs
400
VRMS
Unipolar
0
VREF
Differential Input Range
Bipolar
-VREF/2
+VREF/2
V
Absolute Input Range
0
VAVDD
V
Input Leakage Current
±0.1
A
Conversion Time
13 ADCCLK cycles at 2MHz
6.5
s
Input Capacitance
14
pF
Track-and-Hold Acquisition
Time
Three ADCCLK cycles at 2MHz
1.5
s
Turn-On Time
Eight ADCCLK cycles at 2MHz
4
s
Conversion Clock
fADCCLK
0.5
4
MHz
Conversion Rate
fADCCLK = 4MHz (not production
tested)
250
ksps
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