AD7840KP-REEL

AD7840KP-REEL Datasheet

AD7840

Part	Datasheet
AD7840KP-REEL	AD7840KP-REEL (pdf)

PDF Datasheet Preview
FEATURES Complete 14-Bit Voltage Output DAC Parallel and Serial Interface Capability 80 dB Signal-to-Noise Ratio Interfaces to High Speed DSP Processors e.g., ADSP-2100, TMS32010, TMS32020 45 ns min WR Pulse Width Low Power 70 mW typ. Operates from V Supplies LC2MOS Complete 14-Bit DAC AD7840 FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION The AD7840 is a fast, complete 14-bit voltage output D/A converter. It consists of a 14-bit DAC, 3 V buried Zener reference, DAC output amplifier and high speed control logic. The part features double-buffered interface logic with a 14-bit input latch and 14-bit DAC latch. Data is loaded to the input latch in either of two modes, parallel or serial. This data is then transferred to the DAC latch under control of an asynchronous LDAC signal. A fast data setup time of 21 ns allows direct parallel interfacing to digital signal processors and high speed 16-bit microprocessors. In the serial mode, the maximum serial data clock rate can be as high as 6 MHz. The analog output from the AD7840 provides a bipolar output range of ± 3 V. The AD7840 is fully specified for dynamic performance parameters such as signal-to-noise ratio and harmonic distortion as well as for traditional dc specifications. Full power output signals up to 20 kHz can be created. The AD7840 is fabricated in linear compatible CMOS LC2MOS , an advanced, mixed technology process that combines precision bipolar circuits with low power CMOS logic. The part is available in a 24-pin plastic and hermetic dual-in-line package DIP and is also packaged in a 28-terminal plastic leaded chip carrier PLCC . PRODUCT HIGHLIGHTS Complete 14-Bit D/A Function The AD7840 provides the complete function for creating ac signals and dc voltages to 14-bit accuracy. The part features an on-chip reference, an output buffer amplifier and 14-bit D/A converter. Dynamic Specifications for DSP Users In addition to traditional dc specifications, the AD7840 is specified for ac parameters including signal-to-noise ratio and harmonic distortion. These parameters along with important timing parameters are tested on every device. Fast, Versatile Microprocessor Interface The AD7840 is capable of 14-bit parallel and serial interfacing. In the parallel mode, data setup times of 21 ns and write pulse widths of 45 ns make the AD7840 compatible with modern 16-bit microprocessors and digital signal processors. In the serial mode, the part features a high data transfer rate of 6 MHz. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel 617/329-4700 Fax 617/326-8703 AD7840* Product Page Quick Links Last Content Update 08/30/2016 Comparable Parts View a parametric search of comparable parts Documentation Data Sheet • AD7840 Complete 14-Bit CMOS DAC Data Sheet Reference Materials Solutions Bulletins & Brochures • Digital to Analog Converters ICs Solutions Bulletin Design Resources • AD7840 Material Declaration • PCN-PDN Information • Quality And Reliability • Symbols and Footprints Discussions View all AD7840 EngineerZone Discussions Sample and Buy Visit the product page to see pricing options Technical Support Submit a technical question or find your regional support number VDD = +5 V 5%, VSS = V 5%, AGND = DGND = O V, REF IN = +3 V, RL = 2 CL = 100 pF. All specifications TMIN to TMAX unless othewise noted. Parameter J, A1 K, B1 S1 Units Test Conditions/Comments DYNAMIC PERFORMANCE2 Signal to Noise Ratio3 SNR Total Harmonic Distortion THD ORDERING GUIDE Model1 Temperature Range SNR dB Integral Nonlinearity Package Option2 AD7840JN AD7840KN AD7840JP AD7840KP AD7840AQ AD7840ARS AD7840BQ AD7840SQ3 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C to +85°C to +85°C to +85°C to +125°C 78 min 80 min 78 min 80 min 78 min 78 min 80 min 78 min ± 2 max ± 1 max ± 2 max ± 1 max ± 2 max ± 2 max ± 1 max ± 2 max N-24 N-24 P-28A P-28A Q-24 RS-24 Q-24 Q-24 NOTES 1To order MIL-STD-883, Class B processed parts, add /883B to part number. Contact your local sales office for military data sheet and availability. 2N = Plastic DIP P = Plastic Leaded Chip Carrier Q = Cerdip. 3This grade will be available to /883B processing only. CAUTION ESD electrostatic discharge sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD7840 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. WARNING! ESD SENSITIVE DEVICE AD7840 PIN FUNCTION DESCRIPTION DIP Pin No. Mnemonic Function 6 12 17 18 19 20 21 22 CS/SERIAL WR/SYNC D13/SDATA D12/SCLK D11/FORMAT D10/JUSTIFY DGND D0 VDD AGND VOUT VSS REF OUT REF IN LDAC Chip Select/Serial Input. When driven with normal logic levels, it is an active low logic input which is used in conjunction with WR to load parallel data to the input latch. For applications where CS is permanently low, an R, C is required for correct power-up see LDAC input . If this input is tied to VSS, it defines the AD7840 for serial mode operation. Write/Frame Synchronization Input. In the parallel data mode, it is used in conjunction with CS to load parallel data. In the serial mode of operation, this pin functions as a Frame Synchronization pulse with serial data expected after the falling edge of this signal. Data Bit 13 MSB /Serial Data. When parallel data is selected, this pin is the D13 input. In serial mode, SDATA is the serial data input which is used in conjunction with SYNC and SCLK to transfer serial data to the AD7840 input latch. Data Bit 12/Serial Clock. When parallel data is selected, this pin is the D12 input. In the serial mode, it is the serial clock input. Serial data bits are latched on the falling edge of SCLK when SYNC is low. Data Bit 11/Data Format. When parallel data is selected, this pin is the D11 input. In serial mode, a Logic 1 on this input indicates that the MSB is the first valid bit in the serial data stream. A Logic 0 indicates that the LSB is the first valid bit see Table I . Data Bit 10/Data Justification. When parallel data is selected, this pin is the D10 input. In serial mode, this input controls the serial data justification see Table I . Data Bit 9 to Data Bit Parallel data inputs. Digital Ground. Ground reference for digital circuitry. Data Bit 4 to Data Bit Parallel data inputs. Data Bit 0 LSB . Parallel data input. Positive Supply, +5 V ± Analog Ground. Ground reference for DAC, reference and output buffer amplifier. Analog Output Voltage. This is the buffer amplifier output voltage. Bipolar output range ± 3 V with REF IN = +3 V .

PDF Datasheet Preview

FEATURES Complete 14-Bit Voltage Output DAC Parallel and Serial Interface Capability 80 dB Signal-to-Noise Ratio Interfaces to High Speed DSP Processors
e.g., ADSP-2100, TMS32010, TMS32020 45 ns min WR Pulse Width Low Power 70 mW typ. Operates from V Supplies

LC2MOS Complete 14-Bit DAC

AD7840

FUNCTIONAL BLOCK DIAGRAM

GENERAL DESCRIPTION The AD7840 is a fast, complete 14-bit voltage output D/A converter. It consists of a 14-bit DAC, 3 V buried Zener reference, DAC output amplifier and high speed control logic.

The part features double-buffered interface logic with a 14-bit input latch and 14-bit DAC latch. Data is loaded to the input latch in either of two modes, parallel or serial. This data is then transferred to the DAC latch under control of an asynchronous LDAC signal. A fast data setup time of 21 ns allows direct parallel interfacing to digital signal processors and high speed 16-bit microprocessors. In the serial mode, the maximum serial data clock rate can be as high as 6 MHz.

The analog output from the AD7840 provides a bipolar output range of ± 3 V. The AD7840 is fully specified for dynamic performance parameters such as signal-to-noise ratio and harmonic distortion as well as for traditional dc specifications. Full power output signals up to 20 kHz can be created.

The AD7840 is fabricated in linear compatible CMOS LC2MOS , an advanced, mixed technology process that combines precision bipolar circuits with low power CMOS logic. The part is available in a 24-pin plastic and hermetic dual-in-line package DIP and is also packaged in a 28-terminal plastic leaded chip carrier PLCC .

PRODUCT HIGHLIGHTS Complete 14-Bit D/A Function

The AD7840 provides the complete function for creating ac signals and dc voltages to 14-bit accuracy. The part features an on-chip reference, an output buffer amplifier and 14-bit D/A converter.

Dynamic Specifications for DSP Users In addition to traditional dc specifications, the AD7840 is specified for ac parameters including signal-to-noise ratio and harmonic distortion. These parameters along with important timing parameters are tested on every device.

Fast, Versatile Microprocessor Interface The AD7840 is capable of 14-bit parallel and serial interfacing. In the parallel mode, data setup times of 21 ns and write pulse widths of 45 ns make the AD7840 compatible with modern 16-bit microprocessors and digital signal processors. In the serial mode, the part features a high data transfer rate of 6 MHz.

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel 617/329-4700

Fax 617/326-8703

AD7840* Product Page Quick Links

Last Content Update 08/30/2016

Comparable Parts

View a parametric search of comparable parts

Documentation

Data Sheet
• AD7840 Complete 14-Bit CMOS DAC Data Sheet

Reference Materials

Solutions Bulletins & Brochures
• Digital to Analog Converters ICs Solutions Bulletin

Design Resources
• AD7840 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints

Discussions

View all AD7840 EngineerZone Discussions

Sample and Buy

Visit the product page to see pricing options

Technical Support

Submit a technical question or find your regional support number

VDD = +5 V 5%, VSS = V 5%, AGND = DGND = O V, REF IN = +3 V, RL = 2 CL = 100 pF. All specifications TMIN to TMAX unless othewise noted.

Parameter

J, A1 K, B1 S1

Units

Test Conditions/Comments

DYNAMIC PERFORMANCE2

Signal to Noise Ratio3 SNR

Total Harmonic Distortion THD
ORDERING GUIDE

Model1

Temperature Range

SNR dB

Integral

Nonlinearity Package

Option2

AD7840JN AD7840KN AD7840JP AD7840KP AD7840AQ AD7840ARS AD7840BQ AD7840SQ3
0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C to +85°C to +85°C to +85°C to +125°C
78 min 80 min 78 min 80 min 78 min 78 min 80 min 78 min
± 2 max ± 1 max ± 2 max ± 1 max ± 2 max ± 2 max ± 1 max ± 2 max

N-24 N-24 P-28A P-28A Q-24 RS-24 Q-24 Q-24

NOTES 1To order MIL-STD-883, Class B processed parts, add /883B to part number.

Contact your local sales office for military data sheet and availability. 2N = Plastic DIP P = Plastic Leaded Chip Carrier Q = Cerdip. 3This grade will be available to /883B processing only.

CAUTION ESD electrostatic discharge sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD7840 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

WARNING!

ESD SENSITIVE DEVICE

AD7840

PIN FUNCTION DESCRIPTION

DIP Pin No. Mnemonic

Function
6 12 17 18 19 20 21 22

CS/SERIAL

WR/SYNC

D13/SDATA

D12/SCLK D11/FORMAT

D10/JUSTIFY DGND D0 VDD AGND VOUT VSS REF OUT

REF IN

LDAC

Chip Select/Serial Input. When driven with normal logic levels, it is an active low logic input which is used in conjunction with WR to load parallel data to the input latch. For applications where CS is permanently low, an R, C is required for correct power-up see LDAC input . If this input is tied to VSS, it defines the AD7840 for serial mode operation.

Write/Frame Synchronization Input. In the parallel data mode, it is used in conjunction with CS to load parallel data. In the serial mode of operation, this pin functions as a Frame Synchronization pulse with serial data expected after the falling edge of this signal.

Data Bit 13 MSB /Serial Data. When parallel data is selected, this pin is the D13 input. In serial mode, SDATA is the serial data input which is used in conjunction with SYNC and SCLK to transfer serial data to the AD7840 input latch.

Data Bit 12/Serial Clock. When parallel data is selected, this pin is the D12 input. In the serial mode, it is the serial clock input. Serial data bits are latched on the falling edge of SCLK when SYNC is low.

Data Bit 11/Data Format. When parallel data is selected, this pin is the D11 input. In serial mode, a Logic 1 on this input indicates that the MSB is the first valid bit in the serial data stream. A Logic 0 indicates that the LSB is the first valid bit see Table I .

Data Bit 10/Data Justification. When parallel data is selected, this pin is the D10 input. In serial mode, this input controls the serial data justification see Table I .

Data Bit 9 to Data Bit Parallel data inputs.

Digital Ground. Ground reference for digital circuitry.

Data Bit 4 to Data Bit Parallel data inputs.

Data Bit 0 LSB . Parallel data input.

Positive Supply, +5 V ± Analog Ground. Ground reference for DAC, reference and output buffer amplifier.

Analog Output Voltage. This is the buffer amplifier output voltage. Bipolar output range ± 3 V with REF IN = +3 V .

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Datasheet ID: AD7840KP-REEL 517738