AD9708ARURL

AD9708ARURL Datasheet

AD9708

Part	Datasheet
AD9708ARURL	AD9708ARURL (pdf)

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8-Bit, 100 MSPS+ D/A Converter AD9708 FEATURES Member of Pin-Compatible TxDAC Product Family 125 MSPS Update Rate 8-Bit Resolution Linearity 1/4 LSB DNL Linearity 1/4 LSB INL Differential Current Outputs SINAD 5 MHz Output 50 dB Power Dissipation 175 mW 5 V to 45 mW 3 V Power-Down Mode 20 mW 5 V On-Chip V Reference Single +5 V or +3 V Supply Operation Packages 28-Lead SOIC and 28-Lead TSSOP Edge-Triggered Latches Fast Settling 35 ns Full-Scale Settling to APPLICATIONS Communications Signal Reconstruction Instrumentation PRODUCT DESCRIPTION The AD9708 is the 8-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, was 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 AD9708 offers exceptional ac and dc performance while supporting update rates up to 125 MSPS. The AD9708’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 45 mW, without a significant degradation in performance, by lowering the full-scale current output. In addition, a power-down mode reduces the standby power dissipation to approximately 20 mW. The AD9708 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 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 AD9708 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 REFLO +1.20V REF IO COMP1 50pF RSET +5V CLOCK FS ADJ DVDD DCOM CLOCK SLEEP AVDD ACOM AD9708 CURRENT SOURCE ARRAY COMP2 SEGMENTED SWITCHES LATCHES IOUTA IOUTB DIGITAL DATA INPUTS Differential current outputs are provided to support singleended or differential applications. The current outputs may be directly tied to an output resistor to provide two complementary, single-ended voltage outputs. The output voltage compliance range is V. The AD9708 contains a V on-chip reference and reference control amplifier, which allows the full-scale output current to be simply set by a single resistor. The AD9708 can be driven by a variety of external reference voltages. The AD9708’s full-scale current can be adjusted over a 2 mA to 20 mA range without any degradation in dynamic performance. Thus, the AD9708 may operate at reduced power levels or be adjusted over a 20 dB range to provide additional gain ranging capabilities. The AD9708 is available in 28-lead SOIC and 28-lead TSSOP packages. It is specified for operation over the industrial temperature range. PRODUCT HIGHLIGHTS The AD9708 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 AD9708 uses a proprietary switching technique that enhances dynamic performance well beyond 8- and 10-bit video DACs. On-chip, edge-triggered input CMOS latches readily interface to +3 V and +5 V CMOS logic families. The AD9708 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 allows the AD9708 to operate at reduced power levels i.e., 45 mW without any degradation in dynamic performance. A temperature compensated, V bandgap reference is included on-chip providing a complete DAC solution. An external reference may be used. The current output s of the AD9708 can easily be configured for various single-ended or differential applications. 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., 1999 AD9708* PRODUCT PAGE QUICK LINKS ORDERING GUIDE Model Temperature Package Range Descriptions Package Options* AD9708AR to +85°C 28-Lead 300 Mil SOIC R-28 AD9708ARU to +85°C 28-Lead TSSOP RU-28 AD9708-EB Evaluation Board R = Small Outline IC RU = Thin Small Outline IC. 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 AD9708 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 AD9708 DEFINITIONS OF SPECIFICATIONS Linearity Error Also Called Integral Nonlinearity or INL Linearity error is defined as the maximum deviation of the actual analog output from the ideal output, determined by a straight line drawn from zero to full scale. Differential Nonlinearity or DNL is the measure of the variation in analog value, normalized to full scale, associated with a 1 LSB change in digital input code. Monotonicity A D/A converter is monotonic if the output either increases or remains constant as the digital input increases. Offset Error The deviation of the output current from the ideal of zero is called offset error. For IOUTA, 0 mA output is expected when the inputs are all 0s. For IOUTB, 0 mA output is expected when all inputs are set to 1s. Gain Error The difference between the actual and ideal output span. The actual span is determined by the output when all inputs are set to 1s minus the output when all inputs are set to 0s. Output Compliance Range The range of allowable voltage at the output of a current-output DAC. Operation beyond the maximum compliance limits may cause either output stage saturation or breakdown resulting in nonlinear performance. Temperature Drift Temperature drift is specified as the maximum change from the ambient +25°C value to the value at either TMIN or TMAX. For offset and gain drift, the drift is reported in ppm of full-scale range FSR per degree C. For reference drift, the drift is reported in ppm per degree C. Power Supply Rejection The maximum change in the full-scale output as the supplies are varied from nominal to minimum and maximum specified voltages. Settling Time The time required for the output to reach and remain within a specified error band about its final value, measured from the start of the output transition. Glitch Impulse Asymmetrical switching times in a DAC give rise to undesired output transients that are quantified by a glitch impulse. It is specified as the net area of the glitch in pV-s. Spurious-Free Dynamic Range The difference, in dB, between the rms amplitude of the output signal and the peak spurious signal over the specified bandwidth. Signal-to-Noise and Distortion S/N+D, SINAD Ratio S/N+D is the ratio of the rms value of the measured output signal to the rms sum of all other spectral components below the Nyquist frequency, including harmonics but excluding dc. The value for S/N+D is expressed in decibels. Total Harmonic Distortion THD is the ratio of the rms sum of the first six harmonic components to the rms value of the measured output signal. It is expressed as a percentage or in decibels dB . DVDD DCOM REFLO +1.20V REF REF IO RSET FS ADJ DVDD DCOM CLOCK RETIMED CLOCK OUTPUT LECROY 9210 PULSE GENERATOR SLEEP CLOCK OUTPUT

PDF Datasheet Preview

8-Bit, 100 MSPS+ D/A Converter

AD9708

FEATURES Member of Pin-Compatible TxDAC Product Family 125 MSPS Update Rate 8-Bit Resolution Linearity 1/4 LSB DNL Linearity 1/4 LSB INL Differential Current Outputs SINAD 5 MHz Output 50 dB Power Dissipation 175 mW 5 V to 45 mW 3 V Power-Down Mode 20 mW 5 V On-Chip V Reference Single +5 V or +3 V Supply Operation Packages 28-Lead SOIC and 28-Lead TSSOP Edge-Triggered Latches Fast Settling 35 ns Full-Scale Settling to

APPLICATIONS Communications Signal Reconstruction Instrumentation

PRODUCT DESCRIPTION The AD9708 is the 8-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, was 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 AD9708 offers exceptional ac and dc performance while supporting update rates up to 125 MSPS.

The AD9708’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 45 mW, without a significant degradation in performance, by lowering the full-scale current output. In addition, a power-down mode reduces the standby power dissipation to approximately 20 mW.

The AD9708 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 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 AD9708 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

REFLO +1.20V REF IO

COMP1 50pF

RSET +5V

CLOCK

FS ADJ

DVDD DCOM CLOCK

SLEEP

AVDD ACOM

AD9708

CURRENT SOURCE ARRAY

COMP2

SEGMENTED SWITCHES

LATCHES

IOUTA IOUTB

DIGITAL DATA INPUTS

Differential current outputs are provided to support singleended or differential applications. The current outputs may be directly tied to an output resistor to provide two complementary, single-ended voltage outputs. The output voltage compliance range is V.

The AD9708 contains a V on-chip reference and reference control amplifier, which allows the full-scale output current to be simply set by a single resistor. The AD9708 can be driven by a variety of external reference voltages. The AD9708’s full-scale current can be adjusted over a 2 mA to 20 mA range without any degradation in dynamic performance. Thus, the AD9708 may operate at reduced power levels or be adjusted over a 20 dB range to provide additional gain ranging capabilities.

The AD9708 is available in 28-lead SOIC and 28-lead TSSOP packages. It is specified for operation over the industrial temperature range.

PRODUCT HIGHLIGHTS The AD9708 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 AD9708 uses a proprietary switching technique that enhances dynamic performance well beyond 8- and 10-bit video DACs.

On-chip, edge-triggered input CMOS latches readily interface to +3 V and +5 V CMOS logic families. The AD9708 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 allows the AD9708 to operate at reduced power levels i.e., 45 mW without any degradation in dynamic performance.

A temperature compensated, V bandgap reference is included on-chip providing a complete DAC solution. An external reference may be used.

The current output s of the AD9708 can easily be configured for various single-ended or differential applications.

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., 1999

AD9708* PRODUCT PAGE QUICK LINKS
ORDERING GUIDE

Model

Temperature Package

Range

Descriptions

Package Options*

AD9708AR to +85°C 28-Lead 300 Mil SOIC R-28

AD9708ARU to +85°C 28-Lead TSSOP

RU-28

AD9708-EB Evaluation Board
*R = Small Outline IC RU = Thin Small Outline IC.

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 AD9708 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

AD9708

DEFINITIONS OF SPECIFICATIONS Linearity Error Also Called Integral Nonlinearity or INL Linearity error is defined as the maximum deviation of the actual analog output from the ideal output, determined by a straight line drawn from zero to full scale.

Differential Nonlinearity or DNL is the measure of the variation in analog value, normalized to full scale, associated with a 1 LSB change in digital input code.

Monotonicity A D/A converter is monotonic if the output either increases or remains constant as the digital input increases.

Offset Error The deviation of the output current from the ideal of zero is called offset error. For IOUTA, 0 mA output is expected when the inputs are all 0s. For IOUTB, 0 mA output is expected when all inputs are set to 1s.

Gain Error The difference between the actual and ideal output span. The actual span is determined by the output when all inputs are set to 1s minus the output when all inputs are set to 0s.

Output Compliance Range The range of allowable voltage at the output of a current-output DAC. Operation beyond the maximum compliance limits may cause either output stage saturation or breakdown resulting in nonlinear performance.

Temperature Drift Temperature drift is specified as the maximum change from the ambient +25°C value to the value at either TMIN or TMAX. For
offset and gain drift, the drift is reported in ppm of full-scale range FSR per degree C. For reference drift, the drift is reported in ppm per degree C.

Power Supply Rejection The maximum change in the full-scale output as the supplies are varied from nominal to minimum and maximum specified voltages.

Settling Time The time required for the output to reach and remain within a specified error band about its final value, measured from the start of the output transition.

Glitch Impulse Asymmetrical switching times in a DAC give rise to undesired output transients that are quantified by a glitch impulse. It is specified as the net area of the glitch in pV-s.

Spurious-Free Dynamic Range The difference, in dB, between the rms amplitude of the output signal and the peak spurious signal over the specified bandwidth.

Signal-to-Noise and Distortion S/N+D, SINAD Ratio S/N+D is the ratio of the rms value of the measured output signal to the rms sum of all other spectral components below the Nyquist frequency, including harmonics but excluding dc. The value for S/N+D is expressed in decibels.

Total Harmonic Distortion THD is the ratio of the rms sum of the first six harmonic components to the rms value of the measured output signal. It is expressed as a percentage or in decibels dB .

DVDD DCOM

REFLO
+1.20V REF

REF IO

RSET

FS ADJ DVDD

DCOM CLOCK

RETIMED CLOCK

OUTPUT*

LECROY 9210 PULSE GENERATOR

SLEEP

CLOCK OUTPUT

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Datasheet ID: AD9708ARURL 517783