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MAXQ7667
16-Bit, RISC, Microcontroller-Based,
Ultrasonic Distance-Measuring System
4
_______________________________________________________________________________________
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
REFERENCE BUFFER
Offset
5mV
Minimum Load
2.5
k
Output Bypass Capacitor
0.47
F
EXTERNAL VOLTAGE REFERENCE (Reference Buffer Disabled)
Reference Input Range
Applied at REF
1.0
VAVDD
V
Reference Input Impedance
Measured at REF with the SAR and
sigma-delta ADCs running at
maximum frequency
50
k
INTERNAL VOLTAGE REFERENCE (REFBG)
Initial Accuracy
2.45
2.5
2.55
V
Maximum Temperature
Coefficient
100
ppm/°C
Output Impedance
1.1
k
Power-Supply Rejection Ratio
VAVDD = 3.0V to 3.6V
60
dB
Output Noise
0.5
mVRMS
PROGRAMMABLE BURST-FREQUENCY OSCILLATOR
Burst-Frequency Range
0.025
1.335
MHz
Burst-Frequency Resolution
0.1
%
Change from 40kHz to 60kHz
5
Burst-Frequency Locking
Time
Change from 50kHz to 50.5kHz
2
ms
CRYSTAL OSCILLATOR
Tested crystal frequency
16
Minimum crystal frequency
4
Frequency Range
External clock input
4
16
MHz
Temperature Stability
Excluding crystal
25
ppm/°C
Startup Time
16MHz crystal
10
ms
XIN Input Low Voltage
When driven with external clock source
0.3 x
VDVDD
V
XIN Input High Voltage
When driven with external clock source
0.7 x
VDVDD
V
INTERNAL RC OSCILLATOR
Frequency
13.5
MHz
Initial Accuracy
10.5
%
Temperature Drift
TA = TMIN to TMAX
700
ppm
Supply Rejection
VDVDD = 2.25V to 2.75V
-1.5
%
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