AD768AR Analog Devices Inc, AD768AR Datasheet

IC DAC 16BIT 30MSPS 28-SOIC

AD768AR

Manufacturer Part Number
AD768AR
Description
IC DAC 16BIT 30MSPS 28-SOIC
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD768AR

Settling Time
25ns
Rohs Status
RoHS non-compliant
Number Of Bits
16
Data Interface
Parallel
Number Of Converters
1
Voltage Supply Source
Dual ±
Power Dissipation (max)
600mW
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
28-SOIC (7.5mm Width)
Number Of Channels
1
Resolution
16b
Interface Type
Parallel
Single Supply Voltage (typ)
Not RequiredV
Dual Supply Voltage (typ)
±5V
Power Supply Requirement
Dual
Output Type
Current
Single Supply Voltage (min)
Not RequiredV
Single Supply Voltage (max)
Not RequiredV
Dual Supply Voltage (min)
±4.75V
Dual Supply Voltage (max)
±5.25V
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
28
Lead Free Status / RoHS Status
Not Compliant

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a
PRODUCT DESCRIPTION
The AD768 is a 16-bit, high speed digital-to-analog converter
(DAC) that offers exceptional ac and dc performance. The
AD768 is manufactured on ADI’s Advanced Bipolar CMOS
(ABCMOS) process, combining the speed of bipolar transistors,
the accuracy of laser-trimmable thin film resistors, and the effi-
ciency of CMOS logic. A segmented current source architecture
is combined with a proprietary switching technique to reduce
glitch energy and maximize dynamic accuracy. Edge triggered
input latches and a temperature compensated bandgap reference
have been integrated to provide a complete monolithic DAC
solution.
The AD768 is a current-output DAC with a nominal full-scale
output current of 20 mA and a 1 k output impedance. Differ-
ential current outputs are provided to support single-ended
or differential applications. The current outputs may be tied
directly to an output resistor to provide a voltage output, or fed
to the summing junction of a high speed amplifier to provide a
buffered voltage output. Also, the differential outputs may be
interfaced to a transformer or differential amplifier.
The on-chip reference and control amplifier are configured for
maximum accuracy and flexibility. The AD768 can be driven by
the on-chip reference or by a variety of external reference volt-
ages based on the selection of an external resistor. An external
capacitor allows the user to optimally trade off reference band-
width and noise performance.
The AD768 operates on 5 V supplies, typically consuming
465 mW of power. The AD768 is available in a 28-pin SOIC
package and is specified for operation over the industrial tem-
perature range.
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
30 MSPS Update Rate
16-Bit Resolution
Linearity: 1/2 LSB DNL @ 14 Bits
Fast Settling: 25 ns Full-Scale Settling to 0.025%
SFDR @ 1 MHz Output: 86 dBc
THD @ 1 MHz Output: 71 dBc
Low Glitch Impulse: 35 pV-s
Power Dissipation: 465 mW
On-Chip 2.5 V Reference
Edge-Triggered Latches
Multiplying Reference Capability
APPLICATIONS
Arbitrary Waveform Generation
Communications Waveform Reconstruction
Vector Stroke Display
1 LSB INL @ 14 Bits
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
PRODUCT HIGHLIGHTS
1. The low glitch and fast settling time provide outstanding
2. The excellent dc accuracy of the AD768 makes it suitable for
3. On-chip, edge-triggered input CMOS latches interface
4. A temperature compensated, 2.5 V bandgap reference is
5. The current output(s) of the AD768 may be used singly or
6. Proper selection of an external resistor and compensation
(MSB)
(LSB)
DB15
dynamic performance for waveform reconstruction or digital
synthesis requirements, including communications.
high speed A/D conversion applications.
readily to CMOS logic families. The AD768 can support up-
date rates up to 40 MSPS.
included on-chip allowing for generation of the reference
input current with the use of a single external resistor. An ex-
ternal reference may also be used.
differentially, either into a load resistor, external op amp
summing junction or transformer.
capacitor allow the performance-conscious user to optimize
the AD768 reference level and bandwidth for the target
application.
DB0
TRIGGERED
DECODER
LATCHES
FUNCTIONAL BLOCK DIAGRAM
CLOCK
EDGE-
MSB
AND
BIT
DCOM
NC
LSBs:
CURRENT SOURCES,
SWITCHES, AND
1k R-2R
LADDERS
MSBs: SEGMENTED
CURRENT SOURCES
AND SWITCHES
REFCOM REFOUT
REFERENCE
BANDGAP
2.5V
V
16-Bit, 30 MSPS
DD
D/A Converter
© Analog Devices, Inc., 1996
1k
AD768
IREFIN
CONTROL
AMP
1k
AD768
NR
Fax: 617/326-8703
IOUTA
IOUTB
LADCOM
V
EE

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AD768AR Summary of contents

Page 1

FEATURES 30 MSPS Update Rate 16-Bit Resolution Linearity: 1/2 LSB DNL @ 14 Bits 1 LSB INL @ 14 Bits Fast Settling Full-Scale Settling to 0.025% SFDR @ 1 MHz Output: 86 dBc THD @ 1 MHz ...

Page 2

AD768–SPECIFICATIONS Parameter RESOLUTION 1 DC ACCURACY Linearity Error MIN MAX Differential Nonlinearity MIN MAX Monotonicity (13-Bit) ANALOG OUTPUT Offset Error Gain Error 2 Full-Scale ...

Page 3

... Exposure to absolute maximum rating for extended periods may affect device reliability. ORDERING GUIDE Model Package Description AD768AR 28-Pin 300 mil SOIC AD768ACHIPS Die AD768-EB AD768 Evaluation Board CAUTION ESD (electrostatic discharge) sensitive device ...

Page 4

AD768 1 WAFER TEST LIMITS ( Parameter 2 Integral Nonlinearity 2 Differential Nonlinearity Offset Error Gain Error Reference Voltage Positive Supply Current Negative Supply Current Power Dissipation NOTES 1 Electrical test are performed at wafer ...

Page 5

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

Page 6

AD768 DAC TRANSFER FUNCTION The AD768 may be used in either current-output mode with the output connected to a virtual ground, or voltage-output mode with the output connected to a resistive load. In current output mode (DAC CODE/65536) ...

Page 7

REFERENCE OUTPUT The internal 2.5 V bandgap reference is provided for generation of the I current, and must be compensated externally with REFIN a capacitor of 0 greater from REFOUT to REFCOM external reference is used, ...

Page 8

AD768 –2 –4 –6 – DIGITAL INPUT CODE – k Figure 9. Typical DNL Performance The outputs have a compliance range of –1 +5.0 ...

Page 9

0.80 –0.9424 –1V OUT –0.9433 0.70 –0.9443 0.60 –0.9453 0.50 0.40 –0.9462 0.30 –0.9472 0.20 –0.9481 –0.9498 0.10 0.05 0.025 –0.9500 ...

Page 10

AD768 APPLYING THE AD768 OUTPUT CONFIGURATIONS The following sections illustrate some typical output configura- tions for the AD768. While most figures take the output at IOUTA, IOUTB can be interchanged in all cases. Unless other- wise noted assumed ...

Page 11

For the values given in Figure 24, I equals 4 mA, which results nominal unipolar output swing Note, since A1 has an inverting gain of approximately –4 and a noise gain ...

Page 12

AD768 Figure 28. Printed Circuit Board Ground Plane Layout Figure 29. Printed Circuit Board Power Plane Layout –12– REV. B ...

Page 13

If properly implemented, ground planes can perform a host of functions on high speed circuit boards: bypassing, shielding, current transport, etc. In mixed signal design, the analog and digital portions of the board should be distinct from each other, with ...

Page 14

AD768 AD768 IN MULTITONE TRANSMITTERS (FOR ADSL) Communications applications frequently require aspects of component performance that differ significantly from the simple, single tone signals used in typical SNR and THD tests. This is particularly true for spread-spectrum and frequency divi- ...

Page 15

AD768 EVALUATION BOARD GENERAL DESCRIPTION The AD768- evaluation board for the AD768 16-bit 30 Msps D/A converter. Careful attention to layout and circuit design combined with analog and digital prototyping areas al- lows the user to easily and ...

Page 16

AD768 Clock Input An external sample clock must be provided to either the BNC connector labeled “CLOCK” Pin 33 of the IDC connec- tor. This clock must comply with the logic levels outlined in the AD768 data sheet. ...

Page 17

R12 10k 1µF R1 SW2 499 2 TP1 R13 R14 R15 R16 R17 R18 0 J1 ...

Page 18

AD768 Figure 36. Silkscreen Layer (Not to Scale) –18– REV. B ...

Page 19

Figure 37. Component Side PCB Layout (Not to Scale) Figure 38. Solder Side PCB Layout (Not to Scale) REV. B –19– AD768 ...

Page 20

AD768 0.0118 (0.30) 0.0040 (0.10) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). R-28 300 Mil 28-Pin SOIC 0.7125 (18.10) 0.6969 (17.70 0.2992 (7.60) 0.2914 (7.40) 0.4193 (10.65) 0.3937 (10.00 PIN 1 0.1043 (2.65) 0.0926 (2.35) ...

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