
REV. 0
–3–
AD9218
DIGITAL SPECIFICATIONS
Test
Min
AD9218BST-40/-65
Typ
AD9218BST-80/-105
Min
Typ
Parameter
Temp Level
Max
Max
Unit
DIGITAL INPUTS
Encode Input Common Mode
Encode “1” Voltage
Encode “0” Voltage
Encode Input Resistance
Logic “1” Voltage—S1, S2, DFS
Logic “0” Voltage—S1, S2, DFS
Logic “1” Current—S1
Logic “0” Current—S1
Logic “1” Current—S2
Logic “0” Current—S2
Logic “1” Current—DFS
Logic “0” Current—DFS
Input Capacitance—S1, S2, Encode Inputs
Input Capacitance DFS
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
25
°
C
25
°
C
V
VI
VI
VI
VI
VI
VI
VI
VI
VI
VI
VI
V
V
V
D
/2
V
D
/2
V
V
V
k
V
V
μ
A
μ
A
μ
A
μ
A
μ
A
μ
A
pF
pF
2
2
0.8
2.3
0.8
2.3
1.8
2
2.0
1.8
2
2.0
0.8
+50
–50
400
+50
200
–50
0.8
+50
–50
400
+50
200
–50
–50
–400
50
–50
30
–400
±
10
–230
230
±
10
100
–230
2
4.5
–50
–400
50
–50
30
–400
±
10
–230
230
±
10
100
–230
2
4.5
DIGITAL OUTPUTS
Logic “1” Voltage
Logic “0” Voltage
Output Coding
Full
Full
VI
VI
2.45
2.45
V
V
0.05
0.05
Two’s Comp. or Offset Binary
Two’s Comp. or Offset Binary
Specifications subject to change without notice.
AC SPECIFICATIONS
Test
Level
AD9218BST-40/-65
Min
Typ
AD9218BST-80/-105
Min
Typ
Parameter
Temp
Max
Max
Unit
DYNAMIC PERFORMANCE
1
Signal-to-Noise Ratio (SNR)
(Without Harmonics)
f
IN
= 10.3 MHz
f
IN
= Nyquist
2
Signal-to-Noise Ratio (SINAD)
(With Harmonics)
f
IN
= 10.3 MHz
f
IN
= Nyquist
2
Effective Number of Bits
f
IN
= 10.3 MHz
f
IN
= Nyquist
2
Second Harmonic Distortion
f
IN
= 10.3 MHz
f
IN
= Nyquist
2
Third Harmonic Distortion
f
IN
= 10.3 MHz
f
IN
= Nyquist
2
Spurious Free Dynamic Range SFDR
f
IN
= 10.3 MHz
f
IN
= Nyquist
2
Two-Tone Intermod Distortion (IMD)
f
IN1
= 10 MHz, f
IN2
= 11 MHz
at –7 dBFS
f
IN1
= 30 MHz, f
IN2
= 31 MHz
at –7 dBFS
Analog Bandwidth, Full Power
Crosstalk
25
°
C
25
°
C
I
I
58/55
-/54
59/57
59/56
57/53
55/52
58/55
57/54
dB
dB
25
°
C
25
°
C
I
I
58/54
-/53
59/56
59/55
56/52
55/51
58/53
57/53
dB
dB
25
°
C
25
°
C
I
I
9.4/8.8
-/8.6
9.6/9.1
9.6/8.9
9.1/8.4
9/8.3
9.4/8.6
9.3/8.6
Bits
Bits
25
°
C
25
°
C
I
I
–72/–66
-/–63
–89/–77
–89/–72
–69/–60
–65/–57
–77/–68
–76/–66
dBc
dBc
25
°
C
25
°
C
I
I
–68/–62
-/–60
–79/–68
–78/–64
–62/–57
–63/–57
–71/–63
–73/–69
dBc
dBc
25
°
C
25
°
C
I
I
–68/–62
-/–60
–79/–67
–78/–64
–62/–57
–63/–57
–69/–62
–70/–63
dBc
dBc
25
°
C
V
–74/–73
dBc
25
°
C
V
–73/–73
–77/–67
dBc
25
°
C
25
°
C
V
V
300
–75
300
–75
MHz
dBc
NOTES
1
AC specs based on an analog input voltage of –0.5 dBFS at 10.3 MHz unless otherwise noted. AC specs for -40, -80, -105 grades are tested in 1 V p-p range and
driven differentially. AC specs for -65 grade are tested in 2 V p-p range and driven differentially.
2
The -65, -80, and -105 grades are tested close to Nyquist for that grade: 31 MHz, 39 MHz, and 51 MHz for the -65, -80, and -105 grades respectively.
Specifications subject to change without notice.
(V
DD
= 3.0 V, V
D
= 3.0 V; external reference, unless otherwise noted.)
(V
DD
= 3.0 V, V
D
= 3.0 V; external reference, unless otherwise noted.)