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PDF AS1500 Data sheet ( Hoja de datos )
| Número de pieza | AS1500 | |
| Descripción | (AS1500 - AS1503) Digital Potentiometer | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS1500 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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Data Sheet AS1500/1/2/3
Digital Potentiometer
AS1500/AS1501/AS1502/AS1503
PRELIMINARY FDAACTTASSHHEEEETT
www.datasheet4u.com
Key Features
- 256-Position
- Available in four Resistance values
- AS1500 resistance 10kOhms
- AS1501 resistance 20kOhms
- AS1502 resistance 50kOhms
- AS1503 resistance 100kOhms
- Power Shutdown —Less than 1 µA
- 3-Wire SPI-Compatible Serial Data Input
- 10 MHz Update Data Loading Rate
- 2.7 V to 5.5 V Single-Supply Operation
- Temperature Range –40°C to +125°C
- Package SO-8
- Compatible to AD8400
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. Furthermore the AS150x product
family includes a shutdown mode, where it consumes less
than 1µA. The AS150x is available in an 8-pin SOIC
package. All parts are guaranteed to operate over the
extended industrial temperature range of –40°C to +125°C.
Applications
- Line Impedance Matching
- Volume Control, Panning
- Mechanical Potentiometer Replacement
- Power Supply Adjustment
- Programmable Filters, Delays, Time Constants
VDD
B1
GND 2
CSN 3
SDI 4
AS150x
Top View
8A
7W
6 VDD
5 CK
SDI
CK
CSN
10 Bit
Serial
Latch
8 8-Bit
Latch
AS1500
GND
Figure 1 Pinout andfunctional Block Diagram of Digital Potentiometer AS150x family
8
A
W
B
Revision 1.0, Oct 2004
Page 1 of 8
1 page  
Data Sheet AS1500/1/2/3
AS150x – SPECIFICATIONS
(VDD = 3V±10% or 5V±10%, VA = VDD, VB = 0V,
–40°C≤TA≤+125°C unless otherwise noted.)
www.datashEeeLtE4uC.cTomRICAL CHARACTERISTICS–ALL
VERSIONS
Parameter
Sym-
bol
Conditions
Min
Typ
21
Max
Unit
SWITCHING CHARACTERISTICS 22, 23
Input Clock
Pulsewidth
tCH,
tCL
Clock Level
High or Low
Data Setup Time
tDS
Data Hold Time
tDH
CSN Setup Time
tCSS
CSN High
Pulsewidth
tCSW
CK Fall to CSN Rise
Hold Time
tCSH
CSN Rise to Clock
Rise Setup
tCS1
50
5
5
10
10
0
10
ns
ns
ns
ns
ns
ns
ns
Table 5: Switching Characteristics
Detailed Description
Serial-Programming
Programming of the AS150x is done via the 3 wire serial
interface. The three input signals are serial data input
(SDI), clock(CK) and chip select (CS). A programming
sequence consists of 10-bit, where the last eight bit
contain the code word for the resistor value. The first two
bits A1 and A0 have to be low(see Table ). The data is
shifted into the internal 10 Bit register with the rising edge
of the CK signal. With the rising edge of the CSN signal
the data becomes valid and the resistance is updated (see
figure 2). A detailed block diagram is shown in figure 3.
A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
0 0 MSB Data LSB
Table 6: Serial data format (16 bits)
1
SD
0
CK 1
0
1
CS
0
V
VD
OUT
0V
A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
DAC Register
Figure 2: Timing Diagram
SDI 1
0
1
CK
0
1
CSN
0
V
O
VDD
UT
0V
AX or
tC
tCS
AX or
tD
tD
tCL
tCS
tCS
tCS
tS
±1% Error
Figure 3: Detailed Timing Diagram
±1%
Rheostat Operation
The digital potentiometer family AS150x offers nominal
resistor values of 10kΩ, 20 kΩ, 50kΩ and 100kΩ. The
resistor has 256 contact points where the wiper can access
the resistor. The 8-bit code word determines the position
of the wiper and is decoded through an internal logic. The
lowest code 00h is related to the terminal B. The
resistance is then only determined by the wiper resistance
(100Ω). The resistance for the next code 01h is the
nominal resistor RAB (10kΩ, 20 kΩ, 50kΩ or 100kΩ)
divided through 256 plus the wiper resistor. In case of
AS1501 (10kΩ) the total resistance is 39Ω+100Ω=139Ω.
Accordingly the resistor for code 02h is 78Ω+100Ω=178Ω.
The last code 255h does not connect to terminal A directly
(see Figure 5). So the maximum value is 10000Ω - 39Ω
+100Ω = 10061Ω. The general formula for the calculation
of the resistance RWB is:
21 Typicals represent average readings at 25°C and VDD=5V.
22 Guaranteed by design and not subject to production test.
Resistor-terminal capacitance tests are measured with 2.5V
bias on the measured terminal. The remaining resistor
terminals are left open circuit.
23 See timing diagram for location of measured values. All input
control voltages are specified with tR = tF = 1ns (10% to 90% of
VDD) and timed from a voltage level of 1.6V. Switching
characteristics are measured using VDD=3V or 5V. To avoid
false clocking, a minimum input logic slew rate of 1V/µs should
be maintained.
Revision 1.0, Oct 2004
RWB (Dx)= (Dx)/256⋅RAB + RW
where RAB is the nominal resistance between terminal A
and B, RW is the wiper resistance and DX is the 8-Bit Code
word. In Table 7 the resistor values between the wiper and
terminal B for AS1501 are given for specific codes DX. In
the zero-scale condition the wiper resistance of 100Ω
remains present.
Page 5 of 8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AS1500.PDF ] | |
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