AD760 Analog Devices, AD760 Datasheet

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AD760

Manufacturer Part Number
AD760
Description
16/18-Bit Self-Calibrating Serial/Byte DACPORT
Manufacturer
Analog Devices
Datasheet

Specifications of AD760

Resolution (bits)
18bit
Dac Update Rate
167kSPS
Dac Settling Time
6µs
Max Pos Supply (v)
+15.75V
Single-supply
No
Dac Type
Voltage Out
Dac Input Format
Byte,Ser

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a
PRODUCT DESCRIPTION
The AD760 is a complete 16/18-bit self-calibrating monolithic
DAC (DACPORT®) with onboard voltage reference, double
buffered latches and output amplifier. It is manufactured on
Analog Devices’ BiMOS II process. This process allows the fab-
rication of low power CMOS logic functions on the same chip
as high precision bipolar linear circuitry.
Self-calibration is initiated by simply pulsing the CAL pin low.
The CALOK pin indicates when calibration has been success-
fully completed. The output multiplexer (MUX
to send the output to the bottom of the output range during
calibration.
Data can be loaded into the AD760 as straight binary, serial
data or as two 8-bit bytes. In serial mode, 16-bit or 18-bit data
can be used and the serial mode input format is pin selectable,
to be MSB or LSB first. This is made possible by three digital
input pins which have dual functions (Pins 12, 13, and 14). In
byte mode the user can similarly define whether the high byte or
low byte is loaded first. The serial output (S
user to daisy chain several AD760s by shifting the data through
the input latch into the next DAC thus minimizing the number
of control lines required in a multiple DAC application. The
double buffered latch structure eliminates data skew errors and
provides for simultaneous updating of DACs in a multi-DAC
system.
The asynchronous CLR function can be configured to clear the
output to minus full-scale or midscale depending on the state of
Pin 17 when CLR is strobed. The AD760 also powers up with the
REV. A
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
±0.2 LSB (±0.00031%) Typ Peak DNL and INL
±0.5 LSB (±0.00076%) Typ Unipolar Offset, Bipolar Zero
17-Bit Monotonicity Guaranteed
18-Bit Resolution (in Serial Mode)
Complete 16/18-Bit D/A Function
Microprocessor Compatible
Asynchronous Clear Function
Serial Output Pin Facilitates Daisy Chaining
Pin Strappable Unipolar or Bipolar Output
Low THD+N: 0.005%
MUX Output Control on Power-Up and Supply Glitches
On-Chip Output Amplifier
On-Chip Buried Zener Voltage Reference
Serial or Byte Input
Double Buffered Latches
OUT
OUT
) pin allows the
) can be used
MUX output in a predetermined state by means of a digital and
analog power supply detection circuit. This is particularly use-
ful for robotic and industrial control applications.
The AD760 is available in a 28-pin, 600 mil cerdip package.
The AQ version is specified from –40°C to +85°C.
DACPORT is a registered trademark of Analog Devices, Inc.
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
REF OUT
BIP CLR
OR LBE
REF IN
LDAC
HBE
SER
CLR
UNI/
–0.25
–0.75
0.75
0.25
17
18
19
20
21
25
26
0
0
16/18-Bit Self-Calibrating
FUNCTIONAL BLOCK DIAGRAM
+10V
V
R
C
REF
Typical Integral Nonlinearity
CALOK
OUT
L
L
CS
16
= 2k
= 1000pF
1
9.95k
= –10V TO +10V
S
OR
DB0
16384
14
IN
Serial/Byte DACPORT
CAL
16/18-BIT DAC LATCH
CALIBRATION SEQUENCER
2
CALIBRATION DAC
INPUT REGISTER
MSB/
LSB
OR
DB1
INPUT CODE – Decimal
13
16/18-BIT
MAIN DAC
–V
RAM
DB2
18/16
SERIAL
OR
12
3
EE
32768
+V
4
CC
DB7
© Analog Devices, Inc., 1995
7
+V
49152
5
LL
AD760
AD760
10k
10k
DGND
Fax: 617/326-8703
6
65535
15
24
23
27
28
22
S
SPAN/
BIP
OFF
V
MUX
MUX
AGND
OUT
OUT
OUT
I N

Related parts for AD760

AD760 Summary of contents

Page 1

... The asynchronous CLR function can be configured to clear the output to minus full-scale or midscale depending on the state of Pin 17 when CLR is strobed. The AD760 also powers up with the REV. A 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 ...

Page 2

... 5 2 Power Supply Sensitivity with OUT Power Dissipation (Static, No Load) TEMPERATURE RANGE Specified Performance ( +25° + AD760AQ Min 16/18 2 +85° 9. –10 5 0.9 2.0 0 2.4 +14.25 –15.75 +4.75 –21 –40 –2– = – ...

Page 3

... DAC Gain Error is measured without the on-chip voltage reference. It represents the performance that can be obtained with an external precision reference. 7 External current is defined as the current available in addition to that supplied to REF IN and SPAN/BIPOLAR OFFSET on the AD760. 8 Operation on ±12 V supplies is possible using an external reference such as the AD586 and reducing the output range. Refer to the Internal/External Reference section ...

Page 4

... BES BEH Figure 1a. AD760 Byte Load Timing VALID 16/ CLK Figure 1b. AD760 Serial Load Timing –4– Limit +25° MIN MAX 100 120 100 120 200 200 170 ...

Page 5

... 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 AD760 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 ...

Page 6

... DAC and the output amplifier and is measured with all 0s loaded in the DAC. BIPOLAR ZERO ERROR: When the AD760 is connected for bipolar output and 000 is loaded in the DAC, the devia- tion of the analog output from the ideal midscale value called the bipolar zero error ...

Page 7

... Internal scaling resistors provided in the AD760 may be con- nected to produce a unipolar output range + bipolar output range of – +10 V. Gain and offset drift are minimized in the AD760 because of the thermal tracking of the scaling resistors with other device components. REV. A ...

Page 8

... V to +10.24 V. For example, by using the AD586 5 V reference, outputs ±5 V can be realized. Using the AD586 voltage refer- ence makes it possible to operate the AD760 with ±12 V sup- plies with 10% tolerances. Figure 7 shows the AD760 using the AD586 precision 5 V refer- ence in the bipolar configuration. The highest grade AD586MN is specified with a drift of 2 ppm/° ...

Page 9

... D-to-A Glitch Impulse Figure 8. Output Characteristics DIGITAL CIRCUIT DETAILS The AD760 has several “dual-use” pins that allow flexible op- eration while maintaining the lowest possible pin count and con- sequently the smallest package size. The following information is useful when applying the AD760. ...

Page 10

... Figure 11. The MOSI, SCK, and SS pins of the HC11 are respectively connected to the S pins of the AD760. The majority of the interfacing issues are taken care of in the software initialization. A typical routine such as the one shown below begins by initializing the state of the various SPI data and control registers ...

Page 11

... SS SER Figure 11. AD760 to 68HC11 (SPI) Interface AD760 TO MICROWIRE INTERFACE The flexible serial interface of the AD760 is also compatible with the National Semiconductor MICROWIRE* interface. The MICROWIRE* interface is used on microcontrollers such as the COP400 and COP800 series of processors. A generic in- terface to the MICROWIRE interface is shown in Figure 12. ...

Page 12

... The analog ground pin is the “high quality” ground reference point for the device. Any exter- nal loads on the output of the AD760 should be returned to analog ground external reference is used, this should also be returned to the analog ground. ...

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