app3089| Application Note
Application Note 3089
The Mechanics of the DS1870 Look Up Tables
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Introduction
The DS1870 is used for biasing RF-power amplifiers. This application note intends to show how the 2-dimensional lookup tables work as an example.
Input to Output Path
Figure 1 shows the path from a sensed input to the setting of the output pot's wiper position.
Figure 1
On Chip Temp Sensor VCC Gain Calibration 12-Bit Output D A/D A VCC VD
MUX
+
Offset Calibration
ID1 ID2
+
Value to Address Decoders
Value to Address Decoders
Data Bus
Ch1 Drain LUT 64 Bytes
Ch1 TEM P LUT 72 Bytes
Data Bus
+
+
HCOM W1 L1 10K 15K
Page 1 of 2
Rev: 030404
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