lm9820ccwmx National Semiconductor Corporation, lm9820ccwmx Datasheet - Page 13

• Manufacturer Part Number: lm9820ccwmx
• Description: 10/12-bit Image Sensor Processor Analog Front End
• Manufacturer: National Semiconductor Corporation

Table 2: Configuration Register Parameters
PGA Gain Value
Offset Polarity
Typical Offset
Offset Value
Typical Gain
Boost Gain
Parameter
(Address)
(4, 5 & 6)
(1,2 & 3)
(1,2 & 3)
(1,2 & 3)
(4,5 & 6)
(4,5 & 6)
(4,5 & 6)
Values
Enable
Values
Gain
B4(MSB)
(SIGN)
( x3)
• • •
• • •
• • •
• • •
• • •
B5
B5
B5
B4
B5
0
1
0
0
0
0
0
1
1
1
1
1
0
1
0
0
0
0
0
0
1
1
1
1
1
1
Red, Green and Blue Offset DAC Settings (1, 2 & 3)
(MSB)
(MSB)
• • •
• • •
• • •
• • •
• • •
B3
B4
B3
B4
Red, Green and Blue Gain Settings (4,5 & 6)
0
0
0
1
1
0
0
0
1
1
0
0
0
1
1
1
0
0
0
1
1
1
• • •
• • •
• • •
• • •
• • •
B2
B3
B2
B3
Control Bits
0
0
0
1
1
0
0
0
1
1
0
0
0
1
1
1
0
0
0
1
1
1
• • •
• • •
• • •
• • •
• • •
B1
B2
B1
B2
0
0
0
1
1
0
0
0
1
1
0
0
0
1
1
1
0
0
0
1
1
1
Gain = Boost Gain * PGA Gain
13
B0(LSB)
• • •
• • •
• • •
• • •
• • •
B1
B0
B1
0
0
1
1
1
0
0
1
1
1
0
0
1
0
1
1
0
0
1
0
1
1
Boost Gain = 1V/V
Boost Gain = 3V/V
Negative Offset
Positive Offset
(Continued)
LM9820: Offset = 20LSBs * Offset Value * PGA Gain
LM9810: Offset = 5LSBs * Offset Value * PGA Gain
PGA Gain (V/V) =.933 + 0.0667 * (PGA Gain Value)
(LSB)
(LSB)
• • •
• • •
• • •
• • •
• • •
B0
B0
0
1
0
0
1
0
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
LM9810 LSBs
Typical Offset (with PGA Gain = 1)
+150
+155
-150
-155
0.00
+10
• • •
• • •
-10
+5
-5
0
Typical Gain
Result
(V/V)
0.93
1.00
1.13
2.87
2.93
3.00
2.79
3.00
3.20
8.60
8.80
9.00
• • •
• • •
• • •
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LM9820 LSBs
+600
+620
0.00
-600
-620
+20
+40
• • •
• • •
-20
-40
0