TYPICAL CHARACTERISTICS: VD = VA = +5V (Cont.)
At TA = +25°C, differential transformer coupled output, 50Ω doubly terminated, and SFDR up to Nyquist, unless otherwise noted.
SFDR vs TEMPERATURE AT 100MSPS, 0dBFS
THD vs fCLOCK AT fOUT = 2.1MHz
85
80
75
70
65
60
55
50
45
–70
–75
–80
–85
–90
–95
–100
2HD
2.1MHz
3HD
5.04MHz
X
X
X
X
X
X
X
X
X
20.2MHz
X
X
4HD
–40
–20
0
25
50
70
85
0
25
50
100
125
150
Temperature (°C)
f
CLOCK (MSPS)
SINGLE-TONE OUTPUT SPECTRUM
SINGLE-TONE OUTPUT SPECTRUM
10
0
10
0
fCLOCK = 50MSPS
fOUT = 2.1MHz
fCLOCK = 100MSPS
fOUT = 5.04MHz
–10
–20
–30
–40
–50
–60
–70
–80
–90
–10
–20
–30
–40
–50
–60
–70
–80
–90
SFDR = 69dBc
Amplitude = 0dBFS
SFDR = 67dBc
Amplitude = 0dBFS
0
5
10
15
20
25
0
5
10
15 20
25
30
35
40
45 50
Frequency (MHz)
Frequency (MHz)
SINGLE-TONE OUTPUT SPECTRUM
10
0
fCLOCK = 125MSPS
fOUT = 25.3MHz
–10
–20
–30
–40
–50
–60
–70
–80
–90
SFDR = 57dBc
Amplitude = 0dBFS
0
12.5
25.0
37.5
50.0
62.5
Frequency (MHz)
DAC908
SBAS109B
7
TI [ TEXAS INSTRUMENTS ]
