AD5227BUJZ100-R2 Analog Devices Inc, AD5227BUJZ100-R2 Datasheet - Page 14

• Manufacturer Part Number: AD5227BUJZ100-R2
• Description: IC,Digital Potentiometer,TSSOP,8PIN,PLASTIC
• Manufacturer: Analog Devices Inc

Specifications of AD5227BUJZ100-R2

• Taps: 64
• Resistance (ohms): 100K
• Number Of Circuits: 1
• Temperature Coefficient: 35 ppm/°C Typical
• Memory Type: Volatile
• Interface: Up/Down Counter
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: TSOT-23-8, TSOT-8
• Resistance In Ohms: 100K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD5227
CONSTANT BIAS WITH SUPPLY TO
RETAIN RESISTANCE SETTING
Users who consider EEMEM potentiometers but cannot justify
the additional cost and programming for their designs can con-
sider constantly biasing the AD5227 with the supply to retain
the resistance setting as shown in Figure 38. The AD5227 is
designed specifically with low power to allow power conservation
even in battery-operated systems. As shown in Figure 39, a
similar low power digital potentiometer is biased with a 3.4 V
450 mA/hour Li-Ion cell phone battery. The measurement shows
that the device drains negligible power. Constantly biasing the
potentiometer is a practical approach because most portable
devices do not require detachable batteries for charging.
Although the resistance setting of the AD5227 is lost when the
battery needs to be replaced, this event occurs so infrequently
that the inconvenience is minimal for most applications.
SW1
+
–
Figure 38. Constant Bias AD5227 for Resistance Retention
U1
V
DD
AD5227
GND
GND
V
DD
U2
COMPONENT X
GND
V
DD
U3
COMPONENT Y
GND
V
DD
Rev. B | Page 14 of 16
3.50
3.49
3.48
3.47
3.46
3.45
3.44
3.43
3.42
3.41
3.40
0
Figure 39. Battery Consumption Measurement
2
4
DAYS
6
8
T
A
10
= 25°C
1
2