DS3908N-001+ Maxim Integrated Products, DS3908N-001+ Datasheet - Page 11

• Manufacturer Part Number: DS3908N-001+
• Description: Digital Potentiometer ICs IC POT DUAL DIGITAL atile Digital Potent
• Manufacturer: Maxim Integrated Products

Specifications of DS3908N-001+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The total error in a reading from the DS3908 can be
calculated using the following formula:
PotVoltage = (PotCode / 63) x (V
Error
Error
Error
Total Output Error = Error
where:
PotCode = Potentiometer Setting (dec)
Gain
TRANSISTOR COUNT: 9950
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2006 Maxim Integrated Products
Figure 3. I
Heaney
TYPICAL I
START
B)
A)
A)
EXAMPLE I
ERR
SINGLE BYTE READ
-READ POTENTIOMETER 0
POT
OFFSET
GAIN
SINGLE BYTE
NONVOLATILE WRITE
-WRITE POTENTIOMETER 1
TO 00h
SINGLE BYTE
VOLATILE WRITE
-WRITE POTENTIOMETER 1
TO 00h
MSB
2
1
C WRITE TRANSACTION
2
= Amplifier Gain Deviation from Desired (V/V)
= (INL
2
is a registered trademark of Dallas Semiconductor Corporation.
C Communication Examples
= PotVoltage x Gain
C TRANSACTIONS (WHEN A0, A1, AND A2 ARE CONNECTED TO GND)
0
= Gain x V
ERR
1
ADDRESS*
SLAVE
0
/ 63) x (V
START
START
START
A2
OFF
POT
A1
Potentiometer with Buffered Outputs
1 0 1 0 0 0 0 0
1 0 1 0 0 0 0 0
1 0 1 0 0 0 0 0
Dual, 64-Position Nonvolatile Digital
H
+ Error
A0h
A0
A0h
A0h
ERR
– V
READ/
WRITE
H
R/W
LSB
Chip Topology
L
– V
)
OFFSET
SLAVE
SLAVE
SLAVE
SLAVE
Printed USA
ACK
ACK
ACK
ACK
L
) + V
1 1 1 1 1 0 0 0
1 1 1 1 1 0 0 1
Total Error
MSB
1 1 1 1 1 0 0 1
b7
L
+ Error
F9h
F9h
F8h
b6
REGISTER/MEMORY ADDRESS
*THE SLAVE ADDRESS IS DETERMINED BY ADDRESS PINS A0, A1, AND A2.
b5
GAIN
SLAVE
SLAVE
SLAVE
ACK
ACK
ACK
b4
0 0 0 0 0 0 0 0
b3
0 0 0 0 0 0 0 0
REPEATED
START
b2
V
INL
For example, the worst-case error for V
PGA Gain = 2V/V, PotCode = 31d (1Fh), is given by:
PotVoltage = 31 / 63 x (2.0V - 0.5V) + 0.5V = 1.238V
Error
Error
Error
Total Output Error = Error
For the latest package outline information, go to
www.maxim-ic.com/DallasPackInfo.
OFF
is a registered trademark of Maxim Integrated Products, Inc.
b1
ERR
1 0 1 0 0 0 0 1
POT
OFFSET
GAIN
= PGA Input Voltage Offset Voltage (V)
SLAVE
LSB
SLAVE
b0
ACK
ACK
A1h
= Potentiometer Integral Non-Linearity (LSB)
= (0.6 / 63) x (2.0V - 0.5V) = 0.014V
SLAVE
= PotVoltage x Gain
ACK
STOP
REPEATED
= 2.0V/V x 9mV = 0.018V
START
MSB
SLAVE
b7
ACK
= 0.014V + 0.018V + 0.0929V = 0.125V
b6
STOP
Package Information
DATA
POT 0
b5
POT
b4
DATA
+ Error
b3
MASTER
ERR
NACK
b2
= 0.0929V
OFFSET
STOP
b1
H
= 2V, V
LSB
b0
+ Error
SLAVE
ACK
L
= 0.5V,
STOP
GAIN