
AD9445
Table 7. Pin Function Descriptions—100-Lead TQFP/EP in LVDS Mode
Pin No.
Mnemonic
1
DCS MODE
Rev. 0 | Page 11 of 40
Description
Clock Duty Cycle Stabilizer (DCS) Control Pin. CMOS compatible. DCS = low (AGND) to
enable DCS (recommended); DCS = high (AVDD1) to disable DCS.
Do Not Connect. These pins should float.
CMOS-Compatible Output Logic Mode Control Pin. OUTPUT MODE = 0 for CMOS mode;
OUTPUT MODE = 1 (AVDD1) for LVDS outputs.
Data Format Select Pin. CMOS control pin that determines the format of the output data.
DFS = high (AVDD1) for twos complement; DFS = low (ground) for offset binary format.
Set Pin for LVDS Output Current. Place 3.7 kΩ resistor terminated to DRGND.
3.3 V (±5%) Analog Supply.
2, 49 to 52
3
DNC
OUTPUT MODE
4
DFS
5
6, 18 to 20, 32 to 34, 36, 38,
43 to 45, 92 to 97
7
LVDS_BIAS
AVDD1
SENSE
Reference Mode Selection. Connect to AGND for internal 1 V reference; connect to
AVDD1 for external reference.
1.0 V Reference I/O. Function dependent on SENSE and external programming resistors.
Decouple to ground with 0.1 μF and 10 μF capacitors.
Analog Ground. The exposed heat sink on the bottom of the package must be
connected to AGND.
Differential Reference Output. Decoupled to ground with 0.1 μF capacitor and to REFB
(Pin 14) with 0.1 μF and 10 μF capacitors.
Differential Reference Output. Decoupled to ground with a 0.1 μF capacitor and to REFT
(Pin 13) with 0.1 μF and 10 μF capacitors.
5.0 V Analog Supply (±5%).
Analog Input—True.
Analog Input—Complement.
Clock Input—True.
Clock Input—Complement.
Digital Output Ground.
3.3 V Digital Output Supply (3.0 V to 3.6 V).
D0 Complement Output Bit (LVDS Levels).
D0 True Output Bit.
D1 Complement Output Bit.
D1 True Output Bit.
D2 Complement Output Bit.
D2 True Output Bit.
D3 Complement Output Bit.
D3 True Output Bit.
D4 Complement Output Bit.
D4 True Output Bit.
D5 Complement Output Bit.
D5 True Output Bit.
Data Clock Output—Complement.
Data Clock Output—True.
D6 Complement Output Bit.
D6 True Output Bit.
D7 Complement Output Bit.
D7 True Output Bit.
D8 Complement Output Bit.
D8 True Output Bit.
D9 Complement Output Bit.
D9 True Output Bit.
D10 Complement Output Bit.
D10 True Output Bit.
D11 Complement Output Bit.
D11 True Output Bit.
8
VREF
9, 21, 24, 39, 42, 46, 91, 98, 99,
Exposed Heat Sink
10
AGND
REFT
11
REFB
12 to 17, 25 to 31, 35, 37
22
23
40
41
47, 63, 75, 87
48, 64, 76, 88
53
54
55
56
57
58
59
60
61
62
65
66
67
68
69
70
71
72
73
74
77
78
79
80
81
82
AVDD2
VIN+
VIN
CLK+
CLK
DRGND
DRVDD
D0 (LSB)
D0+
D1
D1+
D2
D2+
D3
D3+
D4
D4+
D5
D5+
DCO
DCO+
D6
D6+
D7
D7+
D8
D8+
D9
D9+
D10
D10+
D11
D11+