Rev. A
|
Page 59 of 80
|
July 2011
ADSP-BF504/ADSP-BF504F/ADSP-BF506F
Figure 56. Linearity Error vs. VREF
Figure 57. Effective Number of Bits vs. VREF
Figure 58. VREF vs. Reference Output Current Drive
VREF (V)
2.5
0
0.5
1.0
1.5
2.0
LINEARITY
ERROR
(LSB)
1.0
0.6
0.8
0.2
0.4
–0.2
0
–0.6
–0.4
–1.0
–0.8
VDD = 3V/5V
DIFFERENTIAL MODE
POSITIVE INL
POSITIVE DNL
NEGATIVE DNL
NEGATIVE INL
VREF (V)
5.0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
EFFECTIVE
NUMBER
OF
BITS
12.0
11.0
11.5
10.0
10.5
9.0
9.5
8.0
7.5
8.5
7.0
VDD = 5V
DIFFERENTIAL MODE
VDD = 3V
DIFFERENTIAL MODE
VDD = 3V
SINGLE-ENDED MODE
VDD = 5V
SINGLE-ENDED MODE
CURRENT LOAD (PA)
200
0
20
40
60
80
100
120
140
160
180
V
REF
(V)
2.5010
2.5000
2.5005
2.4995
2.4990
2.4985
2.4980
Figure 59. Histogram of Codes for 10k Samples in Differential Mode
Figure 60. Histogram of Codes for 10k Samples in Single-Ended Mode
Figure 61. CMRR vs. Common-Mode Ripple Frequency
CODE
2046
2047
2049
2048
2050
NO.
OF
OCCURRENCES
10000
8000
9000
6000
7000
4000
5000
2000
1000
3000
0
10000
CODES
DIFFERENTIAL
MODE
INTERNAL
REFERENCE
CODE
2046
2047
2048
2049
2050
NO.
OF
OCCURRENCES
10000
9000
8000
7000
6000
5000
4000
3000
2000
1000
0
9984
CODES
SINGLE-ENDED
MODE
INTERNAL
REFERENCE
5 CODES
11 CODES
RIPPLE FREQUENCY (kHz)
1200
0
200
400
600
800
1000
CMRR
(dB)
–60
–65
–70
–75
–80
–85
–95
–90
–100
DIFFERENTIAL MODE
VDD = 3V/5V