AD9708-EB Analog Devices Inc, AD9708-EB Datasheet

AD9708-EB

Manufacturer Part Number

AD9708-EB

Description

BOARD EVAL FOR AD9708

Manufacturer

Analog Devices Inc

Series

TxDAC®r

Datasheets

1.AD9708ARZ.pdf (16 pages)

2.AD9708-EB.pdf (4 pages)

Specifications of AD9708-EB

Rohs Status

RoHS non-compliant

Number Of Dac's

Number Of Bits

Outputs And Type

1, Differential

Sampling Rate (per Second)

125M

Data Interface

Parallel

Settling Time

35ns

Dac Type

Current

Voltage Supply Source

Analog and Digital

Operating Temperature

-40°C ~ 85°C

Utilized Ic / Part

AD9708

Lead Free Status / Rohs Status

Not Compliant

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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 opti-

mized 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 +2.7 V

to +5.5 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 addi-

tion, a power-down mode reduces the standby power dissipa-

tion 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 inte-

grated 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 k output impedance.

TxDAC is a registered trademark of Analog Devices, Inc.

*Patent pending.

REV. B

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.

FEATURES

Member of Pin-Compatible TxDAC Product Family

125 MSPS Update Rate

8-Bit Resolution

Linearity: 1/4 LSB DNL

Linearity:

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 1.20 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 0.1%

APPLICATIONS

Communications

Signal Reconstruction

Instrumentation

1/4 LSB INL

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

Tel: 781/329-4700

Fax: 781/326-8703

Differential current outputs are provided to support single-

ended or differential applications. The current outputs may be

directly tied to an output resistor to provide two complemen-

tary, single-ended voltage outputs. The output voltage compliance

range is 1.25 V.

The AD9708 contains a 1.2 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 tem-

perature range.

PRODUCT HIGHLIGHTS

1. The AD9708 is a member of the TxDAC product family, which

2. Manufactured on a CMOS process, the AD9708 uses a pro-

3. On-chip, edge-triggered input CMOS latches readily interface

4. A flexible single-supply operating range of +2.7 V to +5.5 V

5. A temperature compensated, 1.20 V bandgap reference is

6. The current output(s) of the AD9708 can easily be config-

provides an upward or downward component selection path

based on resolution (8 to 14 bits), performance and cost.

prietary switching technique that enhances dynamic perfor-

mance well beyond 8- and 10-bit video DACs.

to +3 V and +5 V CMOS logic families. The AD9708 can

support update rates up to 125 MSPS.

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.

included on-chip providing a complete DAC solution. An

external reference may be used.

ured for various single-ended or differential applications.

CLOCK

SET

+5V

0.1 F

FUNCTIONAL BLOCK DIAGRAM

REF IO

FS ADJ

CLOCK

DVDD

DCOM

+1.20V REF

TxDAC

SLEEP

REFLO

World Wide Web Site: http://www.analog.com

COMP1

DIGITAL DATA INPUTS (DB7–DB0)

8-Bit, 100 MSPS+

50pF

0.1 F

D/A Converter

CURRENT

SEGMENTED

SOURCE

SWITCHES

ARRAY

LATCHES

+5V

AVDD

AD9708*

AD9708

ACOM

COMP2

IOUTA

IOUTB

0.1 F

Related parts for AD9708-EB

AD9708-EB Summary of contents

Page 1

... The AD9708 contains a 1.2 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 range without any degradation in dynamic performance ...

Page 2

... AD9708–SPECIFICATIONS DC SPECIFICATIONS ( MIN Parameter RESOLUTION MONOTONICITY 1 DC ACCURACY Integral Linearity Error (INL) Differential Nonlinearity (DNL) ANALOG OUTPUT Offset Error Gain Error (Without Internal Reference) Gain Error (With Internal Reference) 2 Full-Scale Output Current Output Compliance Range Output Resistance Output Capacitance REFERENCE OUTPUT ...

Page 3

... Single-Ended Output, IOUTA, 50 OUTFS Typ Max 125 2.5 2 –67 –67 –62 –59 –64 – unless otherwise noted) OUTFS Typ Max 1.3 0 0.9 +10 +10 5 0.1% AD9708 Doubly Units MSPS pA dBc dBc dBc dBc dBc dBc dBc dBc dBc dBc Units ...

Page 4

... ACOM COMP1 FS ADJ Model REFIO REFLO AD9708AR SLEEP AD9708ARU – +85 C 28-Lead TSSOP AD9708- Small Outline IC Thin Small Outline IC. –4– PIN FUNCTION DESCRIPTIONS Description DB7 Most Significant Data Bit (MSB). DB6–DB1 Data Bits 1–6. DB0 Least Significant Data Bit (LSB). ...

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