AD9762ARURL

AD9762ARURL Datasheet

AD9762

Part	Datasheet
AD9762ARURL	AD9762ARURL (pdf)

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12-Bit, 125 MSPS D/A Converter AD9762 FEATURES Member of Pin-Compatible TxDAC Product Family 125 MSPS Update Rate 12-Bit Resolution Excellent Spurious Free Dynamic Range Performance SFDR to Nyquist 5 MHz Output 70 dBc Differential Current Outputs 2 mA to 20 mA Power Dissipation 175 mW 5 V to 45 mW 3 V Power-Down Mode 25 mW 5 V On-Chip V Reference Single +5 V or +3 V Supply Operation Package 28-Lead SOIC and TSSOP Edge-Triggered Latches APPLICATIONS Communication Transmit Channel: Basestations Single/Multichannel Applications ADSL/HFC Modems Direct Digital Synthesis DDS Instrumentation PRODUCT DESCRIPTION The AD9762 is the 12-bit resolution member of the TxDAC series of high performance, low power CMOS digital-to-analog converters DACs . The TxDAC family which consists of pin compatible 8-, 10-, 12-, and 14-bit DACs is specifically optimized for the transmit signal path of communication systems. All of the devices share the same interface options, small outline package and pinout, thus providing an upward or downward component selection path based on performance, resolution and cost. The AD9762 offers exceptional ac and dc performance while supporting update rates up to 125 MSPS. The AD9762’s flexible single-supply operating range of V to V and low power dissipation are well suited for portable and low power applications. Its power dissipation can be further reduced to a mere 45 mW without a significant degradation in performance by lowering the full-scale current output. Also, a power-down mode reduces the standby power dissipation to approximately 25 mW. The AD9762 is manufactured on an advanced CMOS process. A segmented current source architecture is combined with a proprietary switching technique to reduce spurious components and enhance dynamic performance. Edge-triggered input latches and a V temperature compensated bandgap reference have been integrated to provide a complete monolithic DAC solution. Flexible supply options support +3 V and +5 V CMOS logic families. The AD9762 is a current-output DAC with a nominal full-scale output current of 20 mA and > 100 output impedance. TxDAC is a registered trademark of Analog Devices, Inc. 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. FUNCTIONAL BLOCK DIAGRAM RSET CLOCK REFLO +1.20V REF REFIO FS ADJ COMP1 AVDD ACOM 50pF AD9762 CURRENT SOURCE ARRAY COMP2 DVDD DCOM SEGMENTED SWITCHES LSB SWITCHES IOUTA IOUTB CLOCK SLEEP LATCHES DIGITAL DATA INPUTS Differential current outputs are provided to support singleended or differential applications. Matching between the two current outputs ensures enhanced dynamic performance in a differential output configuration. The current outputs may be tied directly to an output resistor to provide two complementary, single-ended voltage outputs or fed directly into a transformer. The output voltage compliance range is V. The on-chip reference and control amplifier are configured for maximum accuracy and flexibility. The AD9762 can be driven by the on-chip reference or by a variety of external reference voltages. The internal control amplifier which provides a wide >10:1 adjustment span allows the AD9762 full-scale current to be adjusted over a 2 mA to 20 mA range while maintaining excellent dynamic performance. Thus, the AD9762 may operate at reduced power levels or be adjusted over a 20 dB range to provide additional gain ranging capabilities. The AD9762 is available in 28-lead SOIC and TSSOP packages. It is specified for operation over the industrial temperature range. PRODUCT HIGHLIGHTS The AD9762 is a member of the TxDAC product family which provides an upward or downward component selection path based on resolution 8 to 14 bits , performance and cost. Manufactured on a CMOS process, the AD9762 uses a proprietary switching technique that enhances dynamic performance beyond what was previously attainable by higher power/cost bipolar or BiCMOS devices. On-chip, edge-triggered input CMOS latches interface readily to +3 V and +5 V CMOS logic families. The AD9762 can support update rates up to 125 MSPS. A flexible single-supply operating range of V to V and a wide full-scale current adjustment span of 2 mA to 20 mA allow the AD9762 to operate at reduced power levels. The current output s of the AD9762 can be easily configured for various single-ended or differential circuit topologies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel 781/329-4700 World Wide Web Site: Fax 781/326-8703 Analog Devices, Inc., 2000 ORDERING GUIDE Model Temperature Package Range Package Option* AD9762AR to +85°C 28-Lead 300 mil SOIC R-28 AD9762ARU to +85°C 28-Lead TSSOP RU-28 AD9762-EB Evaluation Board *R = SOIC, RU = TSSOP. THERMAL CHARACTERISTICS Thermal Resistance 28-Lead 300 mil SOIC = 71.4°C/W = 23°C/W 28-Lead TSSOP = 97.9°C/W = 14.0°C/W 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 AD9762 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 PIN CONFIGURATION MSB DB11 1 28 CLOCK DB10 2 27 DVDD DB9 3 26 DCOM DB8 4 25 NC DB7 5 AD9762 24 AVDD DB6 6 TOP VIEW 23 COMP2 DB5 7 Not to Scale 22 IOUTA DB4 8 21 IOUTB DB3 9 20 ACOM DB2 10 19 COMP1 DB1 11 18 FS ADJ DB0 12 17 REFIO NC 13 16 REFLO NC 14

PDF Datasheet Preview

12-Bit, 125 MSPS D/A Converter

AD9762

FEATURES Member of Pin-Compatible TxDAC Product Family 125 MSPS Update Rate 12-Bit Resolution Excellent Spurious Free Dynamic Range Performance SFDR to Nyquist 5 MHz Output 70 dBc Differential Current Outputs 2 mA to 20 mA Power Dissipation 175 mW 5 V to 45 mW 3 V Power-Down Mode 25 mW 5 V On-Chip V Reference Single +5 V or +3 V Supply Operation Package 28-Lead SOIC and TSSOP Edge-Triggered Latches

APPLICATIONS Communication Transmit Channel:

Basestations Single/Multichannel Applications ADSL/HFC Modems Direct Digital Synthesis DDS Instrumentation

PRODUCT DESCRIPTION The AD9762 is the 12-bit resolution member of the TxDAC series of high performance, low power CMOS digital-to-analog converters DACs . The TxDAC family which consists of pin compatible 8-, 10-, 12-, and 14-bit DACs is specifically optimized for the transmit signal path of communication systems. All of the devices share the same interface options, small outline package and pinout, thus providing an upward or downward component selection path based on performance, resolution and cost. The AD9762 offers exceptional ac and dc performance while supporting update rates up to 125 MSPS.

The AD9762’s flexible single-supply operating range of V to V and low power dissipation are well suited for portable and low power applications. Its power dissipation can be further reduced to a mere 45 mW without a significant degradation in performance by lowering the full-scale current output. Also, a power-down mode reduces the standby power dissipation to approximately 25 mW.

The AD9762 is manufactured on an advanced CMOS process. A segmented current source architecture is combined with a proprietary switching technique to reduce spurious components and enhance dynamic performance. Edge-triggered input latches and a V temperature compensated bandgap reference have been integrated to provide a complete monolithic DAC solution. Flexible supply options support +3 V and +5 V CMOS logic families.

The AD9762 is a current-output DAC with a nominal full-scale output current of 20 mA and > 100 output impedance.

TxDAC is a registered trademark of Analog Devices, Inc.

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.

FUNCTIONAL BLOCK DIAGRAM

RSET

CLOCK

REFLO +1.20V REF

REFIO FS ADJ

COMP1 AVDD ACOM
50pF

AD9762

CURRENT SOURCE ARRAY

COMP2

DVDD DCOM

SEGMENTED SWITCHES

LSB SWITCHES

IOUTA IOUTB

CLOCK SLEEP

LATCHES

DIGITAL DATA INPUTS

Differential current outputs are provided to support singleended or differential applications. Matching between the two current outputs ensures enhanced dynamic performance in a differential output configuration. The current outputs may be tied directly to an output resistor to provide two complementary, single-ended voltage outputs or fed directly into a transformer. The output voltage compliance range is V.

The on-chip reference and control amplifier are configured for maximum accuracy and flexibility. The AD9762 can be driven by the on-chip reference or by a variety of external reference voltages. The internal control amplifier which provides a wide >10:1 adjustment span allows the AD9762 full-scale current to be adjusted over a 2 mA to 20 mA range while maintaining excellent dynamic performance. Thus, the AD9762 may operate at reduced power levels or be adjusted over a 20 dB range to provide additional gain ranging capabilities.

The AD9762 is available in 28-lead SOIC and TSSOP packages. It is specified for operation over the industrial temperature range.

PRODUCT HIGHLIGHTS The AD9762 is a member of the TxDAC product family which
provides an upward or downward component selection path based on resolution 8 to 14 bits , performance and cost.

Manufactured on a CMOS process, the AD9762 uses a proprietary switching technique that enhances dynamic performance beyond what was previously attainable by higher power/cost bipolar or BiCMOS devices.

On-chip, edge-triggered input CMOS latches interface readily to +3 V and +5 V CMOS logic families. The AD9762 can support update rates up to 125 MSPS.

A flexible single-supply operating range of V to V and a wide full-scale current adjustment span of 2 mA to 20 mA allow the AD9762 to operate at reduced power levels.

The current output s of the AD9762 can be easily configured for various single-ended or differential circuit topologies.

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

Tel 781/329-4700 World Wide Web Site:

Fax 781/326-8703

Analog Devices, Inc., 2000
ORDERING GUIDE

Model

Temperature Package

Range

Package Option*

AD9762AR to +85°C 28-Lead 300 mil SOIC R-28

AD9762ARU to +85°C 28-Lead TSSOP

RU-28

AD9762-EB Evaluation Board
*R = SOIC, RU = TSSOP.

THERMAL CHARACTERISTICS

Thermal Resistance
28-Lead 300 mil SOIC = 71.4°C/W = 23°C/W
28-Lead TSSOP = 97.9°C/W = 14.0°C/W

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 AD9762 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

PIN CONFIGURATION

MSB DB11 1
28 CLOCK

DB10 2
27 DVDD

DB9 3
26 DCOM

DB8 4
25 NC

DB7 5 AD9762 24 AVDD

DB6 6 TOP VIEW 23 COMP2 DB5 7 Not to Scale 22 IOUTA

DB4 8
21 IOUTB

DB3 9
20 ACOM

DB2 10
19 COMP1

DB1 11
18 FS ADJ

DB0 12
17 REFIO

NC 13
16 REFLO

NC 14

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Datasheet ID: AD9762ARURL 517788