
AD6655
Rev. 0 | Page 21 of 84
PIN 1
INDICATOR
1
D
1
D
1
D
2
D
2
D
2
D
2
D
2
D
2
D
2
D
2
D
2
D
2
D
3
D
3
D
3
D
6
6
6
6
6
5
5
5
5
5
5
5
5
5
5
4
D
D
D
F
F
F
F
D
F
F
F
F
S
C
C
C
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DRVDD
D1–
D1+
D2–
D2+
D3–
D3+
D4–
D4+
DCO–
DCO+
D5–
D5+
D6–
D6+
D7–
SCLK/DFS
SDIO/DCS
AVDD
AVDD
VIN+B
VIN–B
RBIAS
CML
SENSE
VREF
VIN–A
VIN+A
AVDD
SMI SDFS
SMI SCLK/PDWN
SMI SDO/OEB
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
AD6655
PARALLEL LVDS
TOP VIEW
(Not to Scale)
EXPOSED PADDLE, PIN 0
(BOTTOM OF PACKAGE)
0
Table 13. Pin Function Descriptions (Interleaved Parallel LVDS Mode)
Pin No.
Mnemonic
ADC Power Supplies
20, 64
DRGND
1, 21
DRVDD
24, 57
DVDD
36, 45, 46
AVDD
0
AGND
ADC Analog
37
VIN+A
38
VINA
44
VIN+B
43
VINB
39
VREF
40
SENSE
42
RBIAS
41
CML
49
CLK+
50
CLK
ADC Fast Detect Outputs
54
FD0+
53
FD0-
Type
Description
Ground
Supply
Supply
Supply
Ground
Digital Output Ground.
Digital Output Driver Supply (1.8 V to 3.3 V).
Digital Power Supply (1.8 V Nominal.)
Analog Power Supply (1.8 V Nominal.)
Analog Ground. Pin 0 is the exposed thermal pad on the bottom of the package.
Input
Input
Input
Input
Input/Output
Input
Input/Output
Output
Input
Input
Differential Analog Input Pin (+) for Channel A.
Differential Analog Input Pin () for Channel A.
Differential Analog Input Pin (+) for Channel B.
Differential Analog Input Pin () for Channel B.
Voltage Reference Input/Output.
Voltage Reference Mode Select. See Table 15 for details.
External Reference Bias Resistor.
Common-Mode Level Bias Output for Analog Inputs.
ADC Clock Input—True.
ADC Clock Input—Complement.
Output
Output
Channel A/Channel B LVDS Fast Detect Indicator 0—True. See Table 21 for details.
Channel A/Channel B LVDS Fast Detect Indicator 0—Complement. See Table 21 for
details.
Channel A/Channel B LVDS Fast Detect Indicator 1—True. See Table 21 for details.
Channel A/Channel B LVDS Fast Detect Indicator 1—Complement. See Table 21
for details.
Channel A/Channel B LVDS Fast Detect Indicator 2—True See Table 21 for details.
Channel A/Channel B LVDS Fast Detect Indicator 2—Complement. See Table 21 for
details.
Channel A/Channel B LVDS Fast Detect Indicator 3—True. See Table 21 for details.
Channel A/Channel B LVDS Fast Detect Indicator 3—Complement. See Table 21 for
details.
56
55
FD1+
FD1
Output
Output
59
58
FD2+
FD2
Output
Output
61
60
FD3+
FD3
Output
Output