AS1501 - Austriamicrosystems - Datasheet.Directory

AS1500/AS1501/AS1502/AS1503

Digital Potentiometer

Data Sheet

www.austriamicrosystems.com Revision 1.01 1 - 14

1 General Description

The AS1500 is a digital potentiomete r wi th 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

 Available in four Resistance values

- 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

 2.7 V to 5.5 V Single-Supply Operation

 Temperature Range –40º to +125º

 8-pin SOIC Package

3 Applications

The AS1500 is ideal for volume controls in TV sets and

audio systems, and applications th at require lin e

impedance matching, programmable filters or power

supply adjustment. The AS1500 can also be designed in

as a replacement for mechanical potentiometers.

Figure 1. Application Diagram

88A

10 Bit

Serial

Latch

8-Bit

Latch

VCC

GND

SDI

CSN

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AS1500

Data Sheet - Pin Assignments

4 Pin Assignments

Figure 2. Pin Assignments (Top View)

Pin Descriptions

Table 1. Pin Descriptio n

Pin Name Pin Number Description

Terminal B RDAC

GND 2 Ground

CSN 3 Chip Select Input, Active Low. When CSN returns high, data in the serial

input register is loaded into the DAC register.

SDI 4 Serial Data Input

CK 5 Serial Clock Input, Positive Edge Triggered.

VCC 6 Positive power supply, specified for operation at both 3V and 5V.

Wiper RDAC

Terminal A RDAC

AS1500

GND

CSN

6VCC

SDI 5CK

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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 Min Max Units Notes

VCC to GND -0.3 +7 V

VA, VB, VW to GND 0 VCC V

AX – BX, AX – WX, BX – WX ±20 mA

Digital Input and Output Voltage to GND 0 +7 V

Operating Temperature Range -40 +125 ºC

Maximum Junction Temperature (TJ

max) +150 ºC

Storage Temperature -65 +150 ºC

Package body temperature +260 ºC

The reflow peak soldering temperature

(body temperat ure ) spe c i fie d i s 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).

Package Power Dissipation (TJ max - TA) / θJA

ESD 1 kV HBM MIL-Std883E 3015.7methods.

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AS1500

Data Sheet - Electrical Characteristics

6 Electrical Characteristics

AS1500 / AS1501 – SPECIFICATIONS

VCC = 3V±10% or 5V±10%, VA = VCC, VB = 0V, –40ºC ≤ TA ≤ +125ºC unless otherwise noted.

Table 3. Electrical Characteristics – 10k and 20k Versions

Symbol Parameter Conditions Min Typ1Max Units

DC Characteristics Rheostat Mode

RAB Nominal Resistance2

TA = 25ºC, VCC = 5V, AS1500,

Version: 50kΩ81012kΩ

TA = 25ºC, VCC = 5V, AS1501,

Version: 100kΩ16 20 24 kΩ

ΔRAB/ΔTResistance Tempco3VAB = VCC, Wiper = No Connect 500 ppm/ºC

RWWiper Resistance VCC = 5V 20 100 200 Ω

R-DNL Resistor Differential NL4RWB, VCC = 5V, VA = No Connect -1 ±1/4 +1 LSB

R-INL Resistor Integral NL RWB, VCC = 5V, VA = No Connect -2 ±1/2 +2 LSB

DC Characteristics Potentiometer Div ider

N Resolution 8Bits

INL Integral Nonlinearity VCC = 5.5V TA = 25ºC -2 ±1/2 +2 LSB

VCC = 2.7V TA = 25ºC -2 ±1/2 +2 LSB

DNL Differential Nonlinearity VCC = 5.5V TA = 25ºC -1 ±1/4 +1 LSB

VCC = 2.7V TA = 25ºC -1 ±1/4 +1 LSB

ΔVW /ΔTVoltage Divider Tempco Code = 80H15 ppm/ºC

VWFSE Full-Scale Error Code = FFH, VCC = 5.5V -4 -2.8 0 LSB

VWFSE Zero-Scale Error Code = 00H, VCC = 5.5V 01.32LSB

Resistor Terminals

VA, B, W Voltage Range5 0V

CC V

CA, B Capacitance6 Ax, Bx f =1MHz, Measured to GND,

Code = 80H75 pF

CWCapacitance Wx f =1MHz, Measured to GND,

Code = 80H120 pF

Digital Inputs and Outputs

VIH Input Logic High VCC = 5V 2.4 V

VIL Input Logic Low VCC = 5V 0.8 V

VIH Input Logic High VCC = 3V 2.1 V

VIL Input Logic Low VCC = 3V 0.6 V

IIH, IIL Input Current VIN = 5V or 0V, VCC = 5V ±1 µA

CIL Input Capacitance 5pF

Power Supplies

VCC Power Supply Range 2.7 5.5 V

IDD Supply Current (CMOS) VIH = VCC or VIL = 0V, VCC = 5.5V 0.1 1 µA

IDD Supply Current (TTL)7VIH = 2.4V or 0.8V, VCC = 5.5V 0.9 4 mA

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AS1500

Data Sheet - Electrical Characteristics

AS1502 / AS1503 – SPECIFICATIONS

VCC = 3V±10% or 5V±10%, VA = VCC, VB = 0V, –40ºC ≤ TA ≤ +125ºC unless otherwise noted.

PDISS Power Dissipation

(CMOS)8VIH = VCC or VIL = 0V, VCC = 5.5V 27.5 µW

PSSR Power Supply

Suppression Ratio

VCC = 5V+0.5VP

sine wave @

1kHz

AS1500,

Versi on: 10kΩ-54 -25 dB

AS1501,

Versi on: 20kΩ-52 -25 dB

Dynamic Characteristics9

BW_10k Bandwidth –3dB

Bandwidth –3dB RWB = 10 kΩ, VCC = 5V 1000 kHz

BW_20k RWB = 20kΩ, VCC = 5V 500 kHz

THDWTotal Harmonic

Distortion VA = 1VRMS + 2VDC, VB = 2VDC,

f = 1kHz 0.003 %

tS_10k VW Settling Time

RWB = 5kΩ, VA = VCC, VB = 0V,

±1% Error Band 2µs

tS_20k RWB = 10kΩ, VA = VCC, VB = 0V,

±1% Error Band 4µs

eNWB_10k Resistor Noise Voltage RWB = 5kΩ, f =1kHz 9nV/ √ Hz

eNWB_20k RWB = 10kΩ, f =1kHz 13 nV/ √ Hz

1. Typicals represent average readings at 25ºC and VCC = 5V.

2. Wiper is not connected. IAB = 350µA for the 10kΩ version and 175µA for the 20kΩ version.

3. All Tempcos are guaranteed by design and not subject to production test.

4. Terminal A is not connected. IW = 350µ A for the 10kΩ version and 175µA for the 20kΩ version.

5. Resistor terminals A, B, W have no limitations on polarity with respect to each other.

6. All capacitances are 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 cir-

cuit.

7. Worst-case supply current consumed when input logic level at 2.4V, standard characteristic of CMOS logic.

8. PDISS is calculated fro m (IDD×VCC). CMOS logic level inputs result in minimum power dissipation.

9. All dynamic characteristics are guaranteed by design and not subject to production test. All dynamic characteris-

tics use VCC=5V.

Table 4. Electrical Characteristics – 50k and 100k Versions

Symbol Parameter Conditions Min Typ1Max Units

DC Characteristics Rheostat Mode

RAB Nominal Resistance2

TA = 25ºC, VCC = 5V, AS1502,

Version: 50kΩ40 50 60 kΩ

TA = 25ºC, VCC = 5V, AS1503,

Version: 100kΩ80 100 120 kΩ

ΔRAB/ΔTResistance Tempco3VAB = VCC, Wiper = No Connect 500 ppm/ºC

RWWiper Resistance VCC = 5V 20 100 200 Ω

R-DNL Resistor Differential NL4RWB, VCC = 5V, VA = No Connect -1 ±1/4 +1 LSB

R-INL Resistor Integral NL RWB, VCC = 5V, VA = No Connect -2 ±1/2 +2 LSB

Table 3. Electrical Characteristics – 10k and 20k Versions

Symbol Parameter Conditions Min Typ1Max Units

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AS1500

Data Sheet - Electrical Characteristics

DC Characteristics Potentiometer Div ider

N Resolution 8Bits

INL Integral Nonlinearity VCC = 5.5V TA = 25ºC -4 ±1 +4 LSB

VCC = 2.7V TA = 25ºC -4 ±1 +4 LSB

DNL Differential Nonlinearity VCC = 5.5V TA = 25ºC -1 ±1/4 +1 LSB

VCC = 2.7V TA = 25ºC -1 ±1/4 +1 LSB

ΔVW /ΔTVoltage Divider Tempco Code = 80H15 ppm/ºC

VWFSE Full-Scale Error Code = FFH, VCC= 5.5V -1 -0.25 0 LSB

VWFSE Zero-Scale Error Code = 00H, VCC = 5.5V 00.11LSB

Resistor Terminals

VA, B, W Voltage Range5 0V

CC V

CA, B Capacitance6 Ax, Bx f =1MHz, Measured to GND,

Code = 80H15 pF

CWCapacitance Wx f =1MHz, Measured to GND,

Code = 80H80 pF

Digital Inputs and Outputs

VIH Input Logic High VCC = 5V 2.4 V

VIL Input Logic Low VCC = 5V 0.8 V

VIH Input Logic High VCC = 3V 2.1 V

VIL Input Logic Low VCC = 3V 0.6 V

IIH, IIL Input Current VIN = 5V or 0V, VCC = 5V ±1 µA

CIL Input Capacitance 5pF

Power Supplies

VCC Power Supply Range 2.7 5.5 V

IDD Supply Current (CMOS) VIH = VCC or VIL = 0V, VCC = 5.5V 0.1 1 µA

IDD Supply Current (TTL)7VIH = 2.4V or 0.8V, VCC = 5.5V 0.9 4 mA

PDISS Power Dissipation

(CMOS)8VIH = VCC or VIL = 0V, VCC = 5.5V 27.5 µW

PSSR Power Supply

Suppression Ratio

VCC = 5V+0.5VP

sine wave @

1kHz

AS1502,

Versi on: 50kΩ-43 dB

AS1503,

Version: 100kΩ-52 dB

Dynamic Characteristics9

BW_50k Bandwidth –3dB

Bandwidth –3dB RWB = 50 kΩ, VCC = 5V 220 kHz

BW_100k RWB = 100kΩ, VCC = 5V 110 kHz

THDWTotal Harmonic

Distortion VA = 1VRMS + 2VDC, VB = 2VDC,

f = 1kHz 0.003 %

Table 4. Electrical Characteristics – 50k and 100k Versions

Symbol Parameter Conditions Min Typ1Max Units

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AS1500

Data Sheet - Electrical Characteristics

AS150x – SPECIFICATIONS

VCC = 3V±10% or 5V±10%, VA = VCC, VB = 0V, –40ºC ≤ TA ≤ +125ºC unless otherwise noted.

tS_50k VW Settling Time

RWB = 50kΩ, VA = VCC, VB = 0V,

±1% Error Band 9µs

tS_100k RWB = 100kΩ, VA = VCC, VB = 0V,

±1% Error Band 18 µs

eNWB_50k Resistor Noise Voltage RWB = 50kΩ, f =1kHz 20 nV/ √ Hz

eNWB_100k RWB = 100kΩ, f =1kHz 29 nV/ √ Hz

1. Typicals represent average readings at 25ºC and VCC = 5V.

2. Wiper is not connected. IAB = 70µA for the 50kΩ version and 35µA for the 100kΩ version.

3. All Tempcos are guaranteed by design and not subject to production test.

4. Terminal A is not connected. IW = 70µA for the 50kΩ version and 35µA for the 100kΩ version.

5. Resistor terminals A, B, W have no limitations on polarity with respect to each other.

6. All capacitances are 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 cir-

cuit.

7. Worst-case supply current consumed when input logic level at 2.4V, standard characteristic of CMOS logic.

8. PDISS is calculated fro m (IDD×VCC). CMOS logic level inputs result in minimum power dissipation.

9. All dynamic characteristics are guaranteed by design and not subject to production test. All dynamic characteris-

tics use VCC=5V.

Table 5. Switching Characteristics

Symbol Parameter Conditions Min Typ1

1. Typicals represent average readings at 25ºC and VCC=5V.

Max Unit

Switching Characteristics2 3

2. 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.

3. See timing diagram for location of measured values. All input control voltages are specified with tR = tF = 1ns

(10% to 90% of VCC) and timed from a voltage level of 1.6V. Switching characteristics are measured using

VCC=3V or 5V. To avoid false clocking, a minimum input logic slew rate of 1V/µs should be maintained.

tCH, tCL Input Clock Pulsewidth Clock Level High or Low 50 ns

tDS Data Setup Time 5 ns

tDH Data Hold T ime 5 ns

tCSS CSN Setup T ime 10 ns

tCSWH CSN High Pulsewidth 10 ns

tCSWL CSN Low Pulsewidth 100 ms

tCSH CK Fall to CSN Rise

Hold Time 0ns

tCS1 CSN Rise to Clock Rise

Setup 10 ns

Table 4. Electrical Characteristics – 50k and 100k Versions

Symbol Parameter Conditions Min Typ1Max Units

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AS1500

Data Sheet - Detailed Description

7 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 (CSN). 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 to program the resistor value (see Table 6).

Otherwise the resistor value is not affected. 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 become valid and the resistance is updated (see Figure

3). A detailed block diagram is shown in Figure 4.

Table 6. Serial data format (10 bits)

Figure 3. Timing Diagram

Figure 4. Detailed Timing Diagram

A1 A0 D7 D6 D5 D4 D3 D2 D1 D0

MSB Data LSB

A1 A0 D7 D6 D5 D4 D3 D2 D1 D0

VCC

VOUT

SDI

CSN

DAC Register Load

Ax or DxAx or Dx

tCH

tCSH

tCL

tCSS tCSWH

tCS1

± 1% Error Band

VCC

VOUT

CSN

SDI

tCSWL

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AS1500

Data Sheet - Detailed Description

Rheost at Operation

The digital potentiometer family AS150x offers nominal resistor values of 10kΩ, 20kΩ, 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, 20kΩ, 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:

RWB (Dx)= (Dx)/256 • RAB + RW(EQ 1)

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 AS1500 are given for specific codes DX. In

the zero-scale condition the wiper resistance of 100Ω remains present.

The maximum current through the wiper and termi nal B is 5mA. If the current exceeds this limit the internal switches

can degrade or even be damaged. As a mechanical potentiometer the resistances RWA and RWB are totally

symmetrical. The relation betwee n them is shown in Figure 5.

Figure 5. R WA and RWB versa code

Table 7. RDAC-Codes WB

DX (Dec) RWB (Ω)Output State

255 10061 Full Scale

128 5100 Midscale

1 139 1 LSB

0100

Zero-Scale

(Wiper Contact Resistance)

0064 12 19

CODE - Decimal

RWA, RWB - % of Nominal RAB

RWA RWB

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AS1500

Data Sheet - Detailed Description

The resistance RWA is the complimentary resistor to RWB and can be controlled digitally as well. RWA starts at the

maximum value of the nominal resistance and is reduced with increasing 8-Bit code words. The formula to calculate

RWA is given below:

RWA (Dx)= (256 - Dx)/256 • RAB + RW(EQ 2)

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 8 the resistor values between the wiper and terminal B for AS1500 are given for specific codes Dx.

Figure 6. Equivalent RDAC Circuit

Voltage Output Operation

The AS150x family can easily used in an voltage output mode, where the output voltage is proportional to an applied

voltage to a given terminal. When 5V are appl ied to terminal A and B is set to ground the ouput voltage at the wiper

starts at zero volts up to 1LSB less then 5V. One LSB of voltage corresponds to the voltage applied at terminal AB

divided through 256 steps of possible wiper settings. The formula is given by

VW (Dx)= (Dx)/256 • VAB + VB(EQ 3)

where VAB is the voltage applied between terminal A and B, VW is the voltage at the wiper, Dx is the 8-Bit Code word

and VB is the voltage at terminal B. The temperature drift is significant better than in Rheostat mode, since the

temperature coefficient is determined by the internal resistor ratio. Therefore the temperature drift is only 15ppm/°C.

Table 8. RDAC-Codes WA

DX (Dec) RWA (Ω)Output State

255 89 Full Scale

128 5050 Midscale

1 10011 1 LSB

0 10050 Zero-Scale

Rs=RNOMINAL/256

RDAC

LATCH

AND

DECODE

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AS1500

Data Sheet - Detailed Description

Applications

The digital potentiometer can replace in many applications the analog trim ming potentiometer. The digital

potentiometer is not sensitive to vibrations and shocks. It has an extremely small form-factor and can be adjusted very

fast (e.g. AS1500 has an update rate of 600kHz). Furthermore the temperature drift, resolution and noise are

significant better and cannot be achieved with a mechanical trimming potentiometer. Due to the programmability the

resistor settings can be stored in the system memory, so that after a power down the exact settings can be recalled

easily.

All analog signals must remain within 0 to VCC range. For standard potentiometer applications the wiper output can be

used directly. In the case of a lo w impedance load, a buffer shall be used.

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AS1500

Data Sheet - Package Drawings and Markings

8 Package Drawings and Markings

Figure 7. 8-pin SOIC Package

Symbol Min Max

A1 0.10 0.25

B 0.36 0.46

C 0.19 0.25

D 4.80 4.98

E 3.81 3.99

e1.27BSC

H 5.80 6.20

h 0.25 0.50

L .041 1.27

A 1.52 1.72

0º 8º

ZD 0.53REF

A2 1.37 1.57

Notes:

1. Lead coplanarity should be 0 to 0.10mm (.004”) max.

2. Package surface finishing:

(2.1) Top: matte (charmilles #18-30).

(2.2) All sides: matte (charmilles #18-30).

(2.3) Bottom: smooth or matte (charmilles #18-30).

3. All dimensions exclusive of mold flash, and end flash from the pack-

age body shall not exceed 0.24mm (0.10”) per side (D).

4. Details of pin #1 identifier are optional but must be located with in

the zone indicated.

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AS1500

Data Sheet - Ordering Information

9 Ordering Information

Table 9.

Model Resistor Delivery Form Package Description

AS1500 10kΩTub es 8-pin SOIC 8-bit Digital Potentiometer

AS1501 20kΩTub es 8-pin SOIC 8-bit Digital Potentiometer

AS1502 50kΩTub es 8-pin SOIC 8-bit Digital Potentiometer

AS1503 100kΩTubes 8-pin SOIC 8-bit Digital Potentiometer

AS1500-T 10kΩT&R 8-pin SOIC 8-bit Digital Potentiometer

AS1501-T 20kΩT&R 8-pin SOIC 8-bit Digital Potentiometer

AS1502-T 50kΩT&R 8-pin SOIC 8-bit Digital Potentiometer

AS1503-T 100kΩT&R 8-pin SOIC 8-bit Digital Potentiometer

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AS1500

Data Sheet - Ordering Information

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the information set forth herein or regarding the freedom of the described devices from patent infringement.

austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice.

Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for

current information. This product is intended for use in normal commercial applications. Applic ations requiring

extended temperature range, unusual environmental requirements, or high reliability applications, such as military,

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deviations from the standard production flow, such as test flow or test location.

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