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X9470
Figure 2. Sense and Scale Block Diagram
INC/DEC
RW REF RH REF
RL REF
V OUT
V DD
V SENSE+ R SENSE
V SENSE–
I DQ
Cint~2pF ±10%
? V
Comparator
INC/DEC
V REF
10k ?
64-tap
K 2 = 20X
~1k ?
K 1 = 50X
Precision
I-Amp
choke
V gate
RF
PA
Out
RF PA in
The wiper of the digital potentiometer acts like its
mechanical equivalent and does not move beyond the
last position. That is, the counter does not wrap
around when clocked to either extreme. The electronic
switches in the potentiometer operate in a “make
before break” mode when the wiper changes tap posi-
tions. If the wiper is moved several positions, multiple
Storing Bias Resistor Values in Memory. Wiper val-
ues are stored to VOLATILE memory automatically
when CS is HIGH and INC/DEC either transitions from
HIGH to LOW or from LOW to HIGH. Wiper values are
stored to NON-VOLATILE memory during Byte Write
or as described in the following section.
taps are connected to the wiper for t IW (SCL to
RW BIAS change).
When the device is powered-up, the X9470 will load
Table 1. Mode Selection
I NC /
SDA CS* SCL DEC
Mode
the last saved value from the non-volatile memory into
the WCR. Note that the current wiper position can be
saved into non-volatile memory register by using the
SCL and CS pins as shown in Figure 4.
H
H
H
H
H
L
VBIAS is incremented
one tap position.
VBIAS is decremented
one tap position.
Important note: the factory setting of the wiper counter
register is the ZERO-position (0 of 255 taps). This is
H
H
X
or
Lock Wiper Position.
Save to volatile
the default wiper position.
memory. (BiasLock?)
Bias Adjustment Block Instructions and Program-
X
L
X
X
Open Loop.
ming. The SCL, INC/DEC (internal signal) and CS
inputs control the movement of the wiper along the
resistor array. (See Table 1) With CS set HIGH, the
device is selected and enabled to respond to the
INC/DEC and SCL inputs. HIGH to LOW transitions on
SCL will increment or decrement R BIAS (depending on
the state of the INC/DEC input). The INC/DEC input is
derived from the output of the comparator of the
Sense and Scale Block.
13
* When coming out of shutdown, the CS pin must be cycled once before bias
adjustment is enabled.
FN8204.0
March 8, 2005
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