maxq7667 Maxim Integrated Products, Inc., maxq7667 Datasheet - Page 9

• Manufacturer Part Number: maxq7667
• Description: 16-bit, Risc, Microcontroller-based, Ultrasonic Distance-measuring System
• Manufacturer: Maxim Integrated Products, Inc.

(V
unless otherwise noted.)
DVDDIO
50.05
50.04
50.03
50.02
50.01
50.00
49.99
49.98
49.97
49.96
49.95
-50
USING PLL
= +5V, V
-25
BURST OUTPUT FREQUENCY
vs. TEMPERATURE
0
TEMPERATURE (°C)
AVDD
_______________________________________________________________________________________
25
15,000
14,500
14,000
13,500
13,000
12,500
12,000
11,500
11,000
10,500
10,000
Ultrasonic Distance-Measuring System
= +3.3V, V
15
12
50
vs. BANDPASS FILTER CENTER FREQUENCY
9
6
3
0
BANDPASS FILTER OUTPUT NOISE FLOOR
LOWPASS FILTER OUTPUT RIPPLE vs. TIME
20
0
RECEIVE PATH GAIN AT MAXIMUM
MINIMUM ECHO GAIN
20mV
50kHz ECHO FREQUENCY
250ksps
75
T
A
= +105°C
16-Bit, RISC, Microcontroller-Based,
P-P
2
100
DVDD
40
ECHO AMPLITUDE
FREQUENCY (kHz)
125
4
T
A
= +2.5V, f
= +25°C
TIME (ms)
60
6
65,536
57,344
49,152
40,960
32,768
24,576
16,384
T
8192
A
= -40°C
8
0
SYSCLK
80
0
PROGRAMMABLE ECHO GAIN = MINIMUM
10
vs. ECHO INPUT AMPLITUDE
LOWPASS FILTER OUTPUT
0.02
ECHO INPUT AMPLITUDE (V
= 16MHz, burst frequency = bandpass frequency = 50kHz, T
100
12
0.04
Typical Operating Characteristics
0.06
16,000
14,000
12,000
10,000
P-P
0.08
8000
6000
4000
2000
-0.5
-1.0
2.0
1.5
1.0
0.5
)
0
0
(ECHO INPUT TO LOWPASS FILTER OUTPUT)
-50
0
0.10
RECEIVE PATH RESPONSE TIME
INPUT ON
-25
200
SAR ADC OFFSET ERROR
100,000
vs. TEMPERATURE
0
10,000
TEMPERATURE (°C)
1000
100
V
V
10
400
AVDD
AVDD
TIME (µs)
25
20mV
25
50kHz ECHO FREQUENCY
= 3.6V
PROGRAMMABLE ECHO GAIN = MINIMUM
ECHO INPUT AMPLITUDE = 20mV
= 3.3V
MINIMUM ECHO GAIN
P-P
50
600
vs. ECHO INPUT FREQUENCY
ECHO AMPLITUDE
LOWPASS FILTER OUTPUT
40
ECHO INPUT FREQUENCY (kHz)
INPUT OFF
V
75
AVDD
800
250ksps
100
= 3V
55
1000
125
70
A
P-P
= +25°C,
85
100
9