Rainbow Electronics DS1870 - Manual (Page 28)

DS1870
LDMOS RF Power-Amplifier Bias
Controller
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implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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SDA and SCL Pullup Resistors
SDA is an open-collector output on the DS1870 that
requires a pullup resistor to realize high logic levels. A
master using either an open-collector output with a
pullup resistor or a push-pull output driver can be used
for SCL. Pullup resistor values should be chosen to
ensure that the rise and fall times listed in the AC elec-
trical characteristics are within specification.
Advanced Application
A circuit showing the implementaion of current sensing
using the DS1870 is shown under “Advanced
Application”.
SDA
SCL
A2
A1
A0
FAULT
V CC
GND
5V
5V REFERENCE
R POT1
49.9k
(1%)
LOW
PASS
FILTER
R POT2 R S2 R S1
4.22k
(1%)
VD
ID1
ID2
RF
POWER
AMP
RF IN RF OUT
W
1
L
1
W
2
H
COM
L
2
N.C. N.C.
4.7kΩ
3 PLACES
NOTES:
1) IN THIS CONFIGURATION, THE VOLTAGE RANGE OF W
1 AND W 2 IS
3V-5V. THIS RANGE CAN BE EXTENDED USING EXTERNAL RESISTORS.
2) ONE MAX6156B CAN BE USED WITH MULTIPLE DS1870s.
DS1870
MAX6165B
MAX4080
LOW
PASS
FILTER
MAX4080
28V
Advanced Application with Current Sense
Chip Information
TRANSISTOR COUNT: 52,353
SUBSTRATE CONNECTED TO GROUND
Package Information
For the latest package outline information, go to
www.maxim-ic.com/DallasPackInfo.