austriamicrosystems AG
is now
ams AG
The technical content of this austriamicrosystems datasheet is still valid.
Contact information:
Headquarters:
ams AG
Tobelbaderstrasse 30
8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0
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AS1500/AS1501/AS1502/AS1503
D i g i ta l P o t e n t i o m e t e r
Data Sheet
1 General Description
The AS1500 is a digital potentiometer with 256
programmable steps. The values of the resistor can be
controlled via 3 wire serial interface capable to handle
programming rates up to 10MHz.
The AS1500 is available in four different resistor values.
The AS1500 incorporates a 10kΩ, the AS1501 a 20kΩ,
the AS1502 a 50kΩ and the AS1503 a 100kΩ fixed
resistor. The wiper contact taps the fixed resistor at
points determined by the 8-bit digital code word. The
resistance between the wiper and the endpoint of the
resistor is linear. The switching action is performed in a
way that no glitches occur.
The AS150x is available in an 8-pin SOIC package. All
parts are guaranteed to operate over the extended
industrial temperature range of –40º to +125º.
2 Key Features
256 - Taps
- AS1500 resistance 10kΩ
- AS1501 resistance 20kΩ
- AS1502 resistance 50kΩ
- AS1503 resistance 100kΩ
Standby current - Less than 1 µA
3-Wire Serial Data Interface
10 MHz Update Data Loading Rate
Temperature Range –40º to +125º
8-pin SOIC Package
Figure 1. Application Diagram
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2.7 V to 5.5 V Single-Supply Operation
3 Applications
The AS1500 is ideal for volume controls in TV sets and
audio systems, and applications that require line
impedance matching, programmable filters or power
supply adjustment. The AS1500 can also be designed in
as a replacement for mechanical potentiometers.
V
CC
A
10 Bit
Serial
Latch
SDI
CK
CSN
8
8-Bit
Latch
8
W
B
GND
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Available in four Resistance values
AS1500
Data Sheet
- Pin Assignments
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
B 1
GND 2
8 A
7 W
AS1500
CSN 3
SDI 4
6 VCC
Pin Descriptions
Pin Name
B
GND
CSN
SDI
CK
VCC
W
A
Table 1. Pin Description
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Pin Number
1
2
3
4
5
6
Description
Terminal B
RDAC
Ground
Chip Select Input,
Active Low. When CSN returns high, data in the serial
input register is loaded into the DAC register.
Serial Data Input
Serial Clock Input,
Positive Edge Triggered.
Positive power supply,
specified for operation at both 3V and 5V.
Wiper RDAC
7
8
Terminal A RDAC
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AS1500
Data Sheet
- Absolute Maximum Ratings
5 Absolute Maximum Ratings
(TA = 25º C, unless otherwise noted)
Table 2. Absolute Maximum Ratings
Parameter
V
CC
to GND
VA, VB, VW to GND
AX – BX, AX – WX, BX – WX
Digital Input and Output Voltage to GND
Operating Temperature Range
Maximum Junction Temperature (TJ
max)
Storage Temperature
0
-40
Min
-0.3
0
±20
+7
+125
+150
Max
+7
V
CC
Units
V
Notes
mA
V
ºC
ºC
Package body temperature
Package Power Dissipation
ESD
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-65
+150
ºC
+260
ºC
(TJ max - TA) /
θJA
1
kV
HBM MIL-Std883E 3015.7methods.
Revision 1.01
The reflow peak soldering temperature
(body temperature) specified is in
accordance with
IPC/JEDEC J-STD-
020C “Moisture/Reflow Sensitivity
Classification for Non-Hermetic Solid
State Surface Mount Devices”.
The lead finish for Pb-free leaded
packages is matte tin (100% Sn).
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V
AS1500
Data Sheet
- Electrical Characteristics
6 Electrical Characteristics
AS1500 / AS1501 – SPECIFICATIONS
V
CC
= 3V±10% or 5V±10%, V
A
= V
CC
, V
B
= 0V, –40ºC
≤
T
A
≤
+125ºC unless otherwise noted.
Table 3. Electrical Characteristics – 10k and 20k Versions
Symbol
Parameter
Conditions
Min
DC Characteristics Rheostat Mode
T
A
= 25ºC, V
CC
= 5V, AS1500,
Version: 50kΩ
T
A
= 25ºC, V
CC
= 5V, AS1501,
Version: 100kΩ
8
16
10
20
500
12
24
R
AB
Nominal Resistance
2
ΔR
AB
/ΔT
R
W
R-DNL
R-INL
Resistance Tempco
Wiper Resistance
Resistor Differential NL
Resistor Integral NL
DC Characteristics Potentiometer Divider
N
INL
Resolution
Integral Nonlinearity
DNL
ΔV
W
/ΔT
V
WFSE
V
WFSE
Differential Nonlinearity
Voltage Divider Tempco
Full-Scale Error
Zero-Scale Error
5
Resistor Terminals
V
A, B, W
C
A, B
C
W
Voltage Range
Capacitance
6
Digital Inputs and Outputs
V
IH
V
IL
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Capacitance Wx
Input Logic High
Input Logic Low
V
IH
V
IL
Input Logic High
Input Logic Low
Input Current
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IH
, I
IL
C
IL
Input Capacitance
Power Supplies
V
CC
Power Supply Range
Supply Current (CMOS) V
IH
= V
CC
or V
IL
= 0V, V
CC
= 5.5V
Supply Current (TTL)
7
I
DD
I
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V
AB
= V
CC
, Wiper = No Connect
V
CC
= 5V
20
-1
-2
100
200
+1
+2
4
R
WB
, V
CC
= 5V, V
A
= No Connect
±1/4
±1/2
R
WB
, V
CC
= 5V, V
A
= No Connect
8
V
CC
= 5.5V T
A
= 25ºC
V
CC
= 2.7V T
A
= 25ºC
V
CC
= 5.5V T
A
= 25ºC
V
CC
= 2.7V T
A
= 25ºC
-2
-2
-1
-1
±1/2
±1/2
±1/4
±1/4
15
+2
+2
+1
+1
Code = 80
H
Code = FF
H
, V
CC
= 5.5V
Code = 00
H
, V
CC
= 5.5V
-4
0
-2.8
1.3
0
2
0
V
CC
Ax, Bx
f =1MHz, Measured to GND,
Code = 80
H
75
f =1MHz, Measured to GND,
Code = 80
H
V
CC
= 5V
V
CC
= 5V
120
2.4
0.8
2.1
0.6
±1
5
V
CC
= 3V
V
CC
= 3V
V
IN
= 5V or 0V, V
CC
= 5V
2.7
0.1
0.9
5.5
1
4
V
IH
= 2.4V or 0.8V, V
CC
= 5.5V
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kΩ
kΩ
ppm/ºC
Ω
LSB
LSB
Bits
LSB
LSB
LSB
LSB
ppm/ºC
LSB
LSB
V
pF
pF
V
V
V
V
µA
pF
V
µA
mA
4 - 14
Typ
1
Max
Units
微控制器 MCU
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