Datasheet

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SBAS274H − MARCH 2003 − REVISED MAY 2007
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14
TYPICAL CHARACTERISTICS (continued)
All specifications at T
A
= 25°C, AVDD = 5V, DVDD = IOVDD = 3V, f
CLK
= 40MHz, External V
REF
= +3V, 2XMODE = low, V
CM
= 2.0V, and
R
BIAS
= 37kΩ, unless otherwise noted.
SIGNAL−TO−NOISE RATIO
vs INPUT COMMON−MODE VOLTAGE
1.5 1.91.7 2.1 2.3 2.5
Input Common−Mode Voltage, V
CM
(V)
SNR (dB)
89
87
85
83
81
79
77
75
V
IN
=
−
6dBFS
V
IN
=
−
2dBFS
f
IN
= 100kHz
TOTAL HARMONIC DISTORTION
vs INPUT COMMON−MODE VOLTAGE
1.5 1.91.7 2.1 2.3 2.5
Input Common−Mode Voltage, V
CM
(V)
THD (dB)
−
65
−
75
−
85
−
95
−
105
−
115
−
125
−
135
V
IN
=
−
6dBFS
V
IN
=
−
2dBFS
f
IN
= 100kHz
SPURIOUS−FREE DYNAMIC RANGE
vs INPUT COMMON−MODE VOLTAGE
1.5 1.91.7 2.1 2.3 2.5
Input Common−Mode Voltage, V
CM
(V)
SFDR (dB)
105
100
95
90
85
80
75
70
65
V
IN
=
−
6dBFS
V
IN
=
−
2dBFS
f
IN
= 100kHz
SIGNAL−TO−NOISE RATIO
vs CLK FREQUENCY
10 3020 40 50 60
SNR (dB)
90
85
80
75
70
65
60
55
50
45
40
f
IN
= 100kHz, −6dBFS
R
BIAS
=60k
Ω
R
BIAS
= 30k
Ω
R
BIAS
= 50k
Ω
R
BIAS
= 45k
Ω
R
BIAS
=37k
Ω
CLK Frequency, f
CLK
(MHz)
TOTAL HARMONIC DISTORTION
vs CLK FREQUENCY
10 3020 40 50 60
THD (dB)
−
65
−
70
−
75
−
80
−
85
−
90
−
95
−
100
−
105
f
IN
= 100kHz,
−
6dBFS
CLK Frequency, f
CLK
(MHz)
R
BIAS
=60k
Ω
R
BIAS
=37k
Ω
R
BIAS
= 30k
Ω
R
BIAS
=50k
Ω
R
BIAS
=45k
Ω
SPURIOUS−FREE DYNAMIC RANGE
vs CLK FREQUENCY
10 3020 40 50 60
SFDR (dB)
110
105
100
95
90
85
80
75
f
IN
=100kHz,
−
6dBFS
CLK Frequency, f
CLK
(MHz)
R
BIAS
= 45k
Ω
R
BIAS
= 50k
Ω
R
BIAS
= 60k
Ω
R
BIAS
=30k
Ω
R
BIAS
=37k
Ω