ICM7216DIPI Intersil, ICM7216DIPI Datasheet - Page 12

• Manufacturer Part Number: ICM7216DIPI
• Description: IC COUNTER/TIMER FREQ 8DIG 28DIP
• Manufacturer: Intersil

Specifications of ICM7216DIPI

• Rohs Status: RoHS non-compliant
• Other names: 7216DIPI; NT5007

In addition, there is a quantization error inherent in any digital
measurement of ±1 count. Clearly this error is reduced by
displaying more digits. In the frequency mode the maximum
accuracy is obtained with high frequency inputs and in period
mode maximum accuracy is obtained with low frequency
inputs (as can be seen in Figure 11). In time interval
FIGURE 13. MAXIMUM ACCURACY FOR FREQUENCY RATIO MEASUREMENT DUE TO LIMITATION OF QUANTIZATION ERRORS
FIGURE 11. MAXIMUM ACCURACY OF FREQUENCY AND
0
2
4
6
8
1
10
10
0.01s
10 CYCLES
0.1s
2
3
10s
PERIOD MEASUREMENTS DUE TO LIMITATIONS
OF QUANTIZATION ERRORS
1s
1 CYCLE
CYCLES
CYCLES
10
12
FREQUENCY (Hz)
10
FREQUENCY MEASURE
3
PERIOD MEASURE
f
OSC
= 10MHz
0
1
2
3
4
5
6
7
8
1
10
5
ICM7216B, ICM7216D
10
10
2
10
7
10
3
f
A
10
FIGURE 12. MAXIMUM ACCURACY OF TIME INTERVAL
/f
4
B
measurements there can be an error of 1 count per interval.
As a result there is the same inherent accuracy in all ranges
as shown in Figure 12. In frequency ratio measurement can
be more accurately obtained by averaging over more cycles
of INPUT B as shown in Figure 13.
10
0
1
2
3
4
5
6
7
8
5
1 CYCLE
10 CYCLES
10
10
1
2
3
CYCLES
CYCLES
10
RANGE
MEASUREMENT DUE TO LIMITATIONS OF
QUANTIZATION ERRORS
6
MAXIMUM TIME INTERVAL
10
10
FOR 10 INTERVALS
7
10
2
10
TIME INTERVAL (µs)
10
8
MAXIMUM TIME INTERVAL
FOR 10
3
10
3
INTERVALS
4
10
5
MAXIMUM TIME
INTERVAL FOR
10
10
2
6
INTERVALS
10
7
10
8