
AD6653
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
Rev. 0 | Page 14 of 80
0
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
F
3
F
3
F
3
F
6
6
6
6
6
5
5
5
5
5
5
5
5
5
5
4
D
D
D
D
D
D
D
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
D4B
D5B
D6B
D7B
D8B
D9B
D10B
D11B (MSB)
DCOB
DCOA
DNC
DNC
D0A (LSB)
D1A
D2A
DNC = DO NOT CONNECT
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
PIN 1
INDICATOR
AD6653
PARALLEL CMOS
TOP VIEW
(Not to Scale)
EXPOSED PADDLE, PIN 0
(BOTTOM OF PACKAGE)
Figure 9. LFCSP Parallel CMOS Pin Configuration (Top View)
Table 8. Pin Function Descriptions (Parallel CMOS Mode)
Pin No.
Mnemonic
ADC Power Supplies
20, 64
DRGND
1, 21
DRVDD
24, 57
DVDD
36, 45, 46
AVDD
0
AGND
12, 13, 58, 59
DNC
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
29
FD0A
30
FD1A
31
FD2A
32
FD3A
53
FD0B
54
FD1B
55
FD2B
56
FD3B
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.
Do Not Connect.
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 11 for details.
External Reference Bias Resistor.
Common-Mode Level Bias Output for Analog Inputs.
ADC Clock Input—True.
ADC Clock Input—Complement.
Output
Output
Output
Output
Output
Output
Output
Output
Channel A Fast Detect Indicator. See Table 17 for details.
Channel A Fast Detect Indicator. See Table 17 for details.
Channel A Fast Detect Indicator. See Table 17 for details.
Channel A Fast Detect Indicator. See Table 17 for details.
Channel B Fast Detect Indicator. See Table 17 for details.
Channel B Fast Detect Indicator. See Table 17 for details.
Channel B Fast Detect Indicator. See Table 17 for details.
Channel B Fast Detect Indicator. See Table 17 for details.