Datasheet

AD8122 Data Sheet
Rev. 0 | Page 6 of 20
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
NOTES
1. TO ACHIEVE THE SPECIFIED THERMAL RESISTANCE, THE EXPOSED PAD
ON THE UNDERSIDE OF THE PACKAGE MUST BE SOLDERED TO A PAD
ON THE PCB SURFACE THAT IS THERMALLY CONNECTED TO A SOLID
PLANE WITH A VOLTAGE BETWEEN V
S+
AND V
S–
.
2. NC = NO INTERNAL CONNECTION.
1NC
2
+IN
CMP1
3
–IN
CMP1
4
OUT
CMP1
5
V
S+
_
CMP
6
V
S
–
_
CMP
7
OUT
CMP2
8
–IN
CMP2
9
+IN
CMP2
10V
S–
23
V
OFFSET
24 DGND
25
V
GAIN
26
V
PEAK
27
V
FILTER
28
PD
29
DV
S+
30 COAX/UTP
22
DV
S–
21 V
S+
11GAIN
B
12OUT
B
13V
S+
15GAIN
G
17V
S+
16OUT
G
18V
S–
19GAIN
R
20OUT
R
14V
S–
33
AGND
34
+IN
G
35
–IN
G
36
AGND
37
+IN
B
38
–IN
B
39
AGND
40
NC
32
–IN
R
31
+IN
R
AD8122
10780-021
TOP VIEW
(Not to Scale)
1
2
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No. Mnemonic Description
1, 40 NC No Internal Connection.
2 +IN
CMP1
Positive Input, Comparator 1.
3 −IN
CMP1
Negative Input, Comparator 1.
4
OUT
CMP1
Output, Comparator 1.
5 V
S+_CMP
Positive Power Supply, Comparator. Connect to +5 V.
6 V
S−_CMP
Negative Power Supply, Comparator. Connect to −5 V.
7 OUT
CMP2
Output, Comparator 2.
8 −IN
CMP2
Negative Input, Comparator 2.
9
+IN
CMP2
Positive Input, Comparator 2.
10, 14, 18 V
S−
Negative Power Supply, Equalizer Sections. Connect to −5 V.
11 GAIN
B
Blue Channel Gain. Connect to OUT
B
for G = 1; connect to AGND for G = 2.
12 OUT
B
Output, Blue Channel.
13, 17, 21 V
S+
Positive Power Supply, Equalizer Sections. Connect to +5 V.
15 GAIN
G
Green Channel Gain. Connect to OUT
G
for G = 1; connect to AGND for G = 2.
16 OUT
G
Output, Green Channel.
19 GAIN
R
Red Channel Gain. Connect to OUT
R
for G = 1; connect to AGND for G = 2.
20 OUT
R
Output, Red Channel.
22 DV
S−
Negative Power Supply, Digital Control. Connect to −5 V.
23 V
OFFSET
Output Offset Control Voltage.
24 DGND Digital Ground Reference.
25 V
GAIN
Broadband Flat Gain Control Voltage.
26 V
PEAK
Equalizer High Frequency Boost Control Voltage.
27 V
FILTER
Low-Pass Filter Cutoff Frequency Adjustment Control Voltage.
28
PD
Power-Down.
29 DV
S+
Positive Power Supply, Digital Control. Connect to +5 V.
30 COAX/
UTP
Cable Compensation Control Input. Connect this pin to Logic 1 for coaxial cable; connect this pin to
Logic 0 for UTP cable. This input can be left floating in UTP applications.