X9261 Datasheet, PDF (3/21 Pages) Intersil Corporation – Single Supply/Low Power/256-Tap/SPI Bus

X9261
DETAILED FUNCTIONAL DIAGRAM
V_CC
HOLD
CS
SCK
SO
SI
A0
A1
WP
INTERFACE
AND
CONTROL
CIRCUITRY
8
Data
R_H0 R_L0R_W0
Power-on
Recall
R₀ R₁
R₂ R₃
Wiper
Counter
Register
(WCR)
Pot 0
50kΩ and 100kΩ
256-taps
Power-on
Recall
R₀ R₁
R₂ R₃
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 1
V_SS
CIRCUIT LEVEL APPLICATIONS
• Vary the gain of a voltage amplifier
• Provide programmable dc reference voltages for
comparators and detectors
• Control the volume in audio circuits
• Trim out the offset voltage error in a voltage ampli-
fier circuit
• Set the output voltage of a voltage regulator
• Trim the resistance in Wheatstone bridge circuits
• Control the gain, characteristic frequency and
Q-factor in filter circuits
• Set the scale factor and zero point in sensor signal
conditioning circuits
• Vary the frequency and duty cycle of timer ICs
• Vary the dc biasing of a pin diode attenuator in RF
circuits
• Provide a control variable (I, V, or R) in feedback
circuits
R_L1 R_H1 R_W1
SYSTEM LEVEL APPLICATIONS
• Adjust the contrast in LCD displays
• Control the power level of LED transmitters in
communication systems
• Set and regulate the DC biasing point in an RF
power amplifier in wireless systems
• Control the gain in audio and home entertainment
systems
• Provide the variable DC bias for tuners in RF wire-
less systems
• Set the operating points in temperature control
systems
• Control the operating point for sensors in industrial
systems
• Trim offset and gain errors in artificial intelligent
systems
3
FN8171.2
September 14, 2005