MAXQ7667 Datasheet, PDF (3/40 Pages) Maxim Integrated Products – 16-Bit, RISC, Microcontroller-Based, Ultrasonic Distance-Measuring System

16-Bit, RISC, Microcontroller-Based,
Ultrasonic Distance-Measuring System
ELECTRICAL CHARACTERISTICS (continued)
(V_DVDDIO = +5V, V_AVDD = +3.3V; V_DVDD = +2.5V, system clock (f_SYSCLK) = 16MHz, burst frequency (f_BURST) = bandpass frequency
(f_BPF) = 50kHz, C_REFBG = C_REF = 1µF in parallel with 0.01µF, f_ADCCLK = 2MHz (SAR data rate = 125ksps), T_A = T_MIN to T_MAX, unless
otherwise specified. Typical values are at T_A = +25°C.)
PARAMETER
BANDPASS FILTER
Center Frequency
Passband Width
Minimum Stopband
Rejection
Output Data Rate
Output Data Resolution
LOWPASS FILTER
Corner Frequency
Rolloff
Output Data Rate
Output Data Resolution
SAR ADC
Resolution
Integral Nonlinearity
Differential Nonlinearity
Offset Error
Offset-Error Drift
Gain Error
SYMBOL
CONDITIONS
f_BPF
-3dB
One decade away from center
frequency
f_LPF -3dB
Measurement
No missing codes
Tested at 125ksps
Tested at 125ksps
MIN
TYP
MAX
UNITS
25
100
0.14 x f_BPF
-60
10 x f_BPF
16
kHz
kHz
dB
ksps
Bits
0.1 x f_BPF
40
5 x f_BPF
16
kHz
dB/Decade
ksps
Bits
12
Bits
11
±1
±2
LSB
-2
+2
LSB
±1
±3
mV
±5
µV/°C
±1
%
Gain-Error Temperature
Coefficient
Input-Referred Noise
Differential Input Range
Absolute Input Range
Input Leakage Current
Conversion Time
Input Capacitance
At ADC inputs
Unipolar
Bipolar
13 ADCCLK cycles at 2MHz
0
-V_REF/2
0
±0.4
400
±0.1
14
ppmFS/°C
V_REF
+V_REF/2
V_AVDD
6.5
µV_RMS
V
V
µA
µs
pF
Track-and-Hold Acquisition
Time
Three ADCCLK cycles at 2MHz
Turn-On Time
Conversion Clock
Eight ADCCLK cycles at 2MHz
f_ADCCLK
0.5
Conversion Rate
f_ADCCLK = 4MHz (not production
tested)
1.5
µs
4
µs
4
MHz
250
ksps
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