MICROPOWER MULTIPLYING CONVERTER GENERAL DESCRIPTION ALD1801 8-bi

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MICROPOWER MULTIPLYING CONVERTER GENERAL DESCRIPTION ALD1801 8-bi

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ALD1801A/ALD1801B ALD1801
MICROPOWER MULTIPLYING CONVERTER
GENERAL DESCRIPTION ALD1801 8-bit monolithic current output digital analog converter designed provide power, operating voltage simple operation. offers industry configuration DAC-08 types, intended wide range digital analog conversion control applications single power supply dual power supply systems, well +12V battery operated systems. Device characteristics specified single supply 3.3V dual supply systems. ALD1801 manufactured with Advanced Linear Devices' enhanced ACMOS silicon gate CMOS process been designed also used linear cell element Advanced Linear Devices' "FunctionSpecific" ASIC, fully compatible design, operation, manufacture with other linear elements Advanced Linear Devices' product family. ALD1801 designed with matching between reference full scale currents. Digital inputs standard CMOS logic inputs provide ease interface. Output currents directly converted voltage output using pair resistors. When used with ALD's rail-to-rail output operational amplifiers such ALD1702, full scale output easily achieved with single power supply. ORDERING INFORMATION
Operating Temperature Range -55°C +125°C +70°C +70°C 16-Pin CERDIP Package ALD1801A ALD1801B ALD1801 16-Pin Small Outline Package(SOIC) ALD1801A ALD1801B ALD1801 16-Pin Plastic Package ALD1801A ALD1801B ALD1801
FEATURES voltage operation power 1.8mW 3.3V Single supply operation 3.3V) Direct CMOS logic interface Complementary current outputs Nonlinearity 0.1% over temperature range High input impedance full scale current High output impedance CONFIGURATION
VIOUT
VREFVREF+
VIEW PACKAGE
connected internally. connect externally.
Contact factory industrial temperature range
BLOCK DIAGRAM
VREF+ VREF15 IOUT
IOUT
1998 Advanced Linear Devices, Inc. Tasman Drive, Sunnyvale, California 94089 -1706 Tel: (408) 747-1155 Fax: (408) 747-1286 http://www.aldinc.com
OPERATING ELECTRICAL CHARACTERISTICS ±2.5V +5.0V unless otherwise specifie
Parameter Supply Voltage Resolution Monotonicity Nonlinearity V+1.5 Symbol ±1.5 1801A ±6.0 ±1.5 1801B 1801 ±6.0 Unit Test Conditions Dual Supply Single Supply
±6.0 ±1.5
±0.1
±0.19
±0.39
Bits Bits
Full Scale
Settling Time
ppm/°C
with bits turned on/off Each Bits
Propagation Delay Full Scale Tempco Output Compliance Output Impedance Full Scale Current Range Full Scale Symmetry Zero Scale Current
+0.2 V+1.5
V+0.2 +1.5
+0.2
±2.5
Output Within Compliance limits ROUT VREF 2.5V; RREF =25K
IFSS
±2.5
±2.5
Logic Input Level Logic Logic Logic Swing Logic Threshold Range Reference Bias Current Power Supply Current Power Dissipation
-1.1
-1.1
-1.1
Supply ±2.5V
-2.8 -1.5
-2.8 -1.5
-2.8 -1.5
Supply ±2.5V Supply ±2.5V
1000
1000
1000
Full Scale Output 100µA Supply ±2.5V
Compensation
Required
Notes:
Contact ±1.0V/±1.25V operation Logic levels 0.4V 4.6V single supply applications.
ALD1801A/ALD1801B ALD1801
Advanced Linear Devices
OPERATING ELECTRICAL CHARACTERISTICS 25°C ±1.65V +3.3V unless otherwise specified
Parameter Resolution Monotonicity Nonlinearity Symbol ±0.1 1801A ±0.19 1801B 1801 ±0.39 Unit Bits Bits
Full Scale
Test Conditions
Settling Time
10.0
10.0
10.0
with bits turned on/off Each Bits Bits
Propagation Delay Full Scale Tempco Output Compliance Output Impedance Full Scale Current Range Full Scale Symmetry Zero Scale Current Reference Bias Current Power Supply Current Power Dissipation
ppm/°C
V+1.5
+0.2
V+1.5
V+0.2 +1.5
+0.2
Output Within Compliance limits ROUT ROUT 100K VREF 2.5V; RREF =50K
IFSS
±2.5
±2.5
±2.5
Full Scale Output 50µA
ALD1801A/ALD1801B ALD1801
Advanced Linear Devices
DUAL SUPPLY ±2.5V RATIOMETRIC VOLTAGE OUTPUT
+VREF
2.5V 1702
2.5V 2.5V
VOUT
VREF-
+VREF =2.5V
1801
Zero Scale Half Scale -LSB Half Scale Half Scale +LSB Full Scale
VOUT -2.500 -2.480 -0.019 0.000 0.019 2.480
SINGLE SUPPLY 3.3V RATIOMETRIC VOLTAGE OUTPUT
3.3V
VOUT ALD2701
ALD2701
0.1µF
+VREF
1801
Zero Scale Half Scale Full Scale
VOUT 0.000 1.650 3.287
ALD1801A/ALD1801B ALD1801
Advanced Linear Devices
APPLICATIONS NOTES: ALD1801 multiplying converter. been designed operate with standard single split power supplies ±5V. Functionality extends down ±1.5V power supply, making ideal lithium battery rechargeable battery operated systems where power efficiency performance important design parameters. ALD1801 features ultra quiescent bias current which depends operating current internal current steering circuit. high gain internal operational amplifier fully compensated stable operation without need external capacitor compensation. operational amplifier placed negative feedback loop generate reference current ratio matched transistors. trimmed provide nonlinearity specified. some applications this feature used along with multiplying nature ALD1801 obtain digital analog conversion with external switches. ALD1801 multiplying converter which output current that function digital input word multiplied reference current. reference current fixed reference current varying input current. fixed reference voltage varying impedance voltage output source used, fixed value resistor (referred RREF) used convert voltage into reference current most applications. precision fixed resistor without trimming. Trimming accomplished adjusting RREF through either connecting potentiometer series with fixed resistor substituting fixed resistor with multiturn potentiometer. recommended nominal value 25K. ALD1801 operate from single power supply dual supplies ±6.6V. Symmetrical supplies required case dual supply operation. However, REF- input voltage must higher above voltage. internal operational amplifier feedback, REF+ input terminal would same potential REF- input terminal, with input reference current determined Input reference current (VREF-) RREF ALD1801 fabricated CMOS technology provides direct logic interface CMOS logic families including logic levels CD4000 logic families operating logic voltage levels other than primarily designed operate power supply environment where interface takes place between digital logic circuitry analog circuitry. Both types circuitry operate with same power supplies. nonlinearity monotonicity ALD1801 applies over full rated operating temperature. device been developed with minimal temperature drift, typically ±10ppm/°C. single array matched tracked resistor networks nominal used resistors required converter. example, RREF connecting resistors parallel where output resistors 50K. very quiescent reference currents used, layout circuit board minimize parasitic capacitance important getting high frequency operation, settling time large part output currents charging discharging node capacitances output. internal bias current levels adaptive reference current, switching speed device depends reference current selected. Characterization settling time been performed full scale current 100µA device operation single supply. Faster operation obtained using short leads, minimizing output capacitance, load resistor values, adequate bypass capacitors placed board supply reference nodes. Both outputs used simultaneously. outputs used, then must connected ground potential where maintain constant value. internal leakage currents that vary with temperature, recommended that 50µA 100µA used that 1/2LSB current high level possible. temperature coefficient reference resistor RREF output resistors ROUT should match minimize temperature drift.
ALD1801A/ALD1801B ALD1801
Advanced Linear Devices
TYPICAL PERFORMANCE CHARACTERISTICS
PROPAGATION DELAY FUNCTION FULL SCALE OUTPUT CURRENT
PROPAGATION DELAY (µsec)
SUPPLY CURRENT FUNCTION TEMPERATURE
SUPPLY CURRENT (µA)
ISVS ±2.5V ±2.5V ±1.65V ±1.65V BITS "HIGH VREF RREF
ISIS+
OUTPUT CURRENT (µA)
TEMPERATURE (°C)
FULL SCALE OUTPUT CURRENT (µA)
SUPPLY CURRENT FUNCTION SUPPLY VOLTAGE
SUPPLY CURRENT (µA)
FULL SCALE 25°C IREF 100µA
FULL SCALE OUTPUT CURRENT FUNCTION SUPPLY VOLTAGE
IREF 100µA IREF 50µA
IREF
SUPPLY VOLTAGE
SUPPLY VOLTAGE
FULL SCALE OUTPUT CURRENT FUNCTION OUTPUT VOLTAGE (COMPLIANCE)
FULL SCALE OUTPUT CURRENT FUNCTION REFRENCE CURRENT
OUTPUT CURRENT (µA)
±1.65V ±2.5V
OUTPUT CURRENT (µA)
±2.5V ±1.65V
IREF 100µA
±2.5V
±1.65V
IREF 50µA
SUPPLY VOLTAGE
REFRENCE CURRENT (µA)
ALD1801A/ALD1801B ALD1801
Advanced Linear Devices

MICROPOWER MULTIPLYING CONVERTER GENERAL DESCRIPTION ALD1801 8-bi

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