AD760 Datasheet, PDF (1/12 Pages) Analog Devices – 16/18-Bit Self-Calibrating Serial/Byte DACPORT

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16/18-Bit Self-Calibrating
Serial/Byte DACPORT
AD760
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
On-Chip Output Amplifier
On-Chip Buried Zener Voltage Reference
Microprocessor Compatible
Serial or Byte Input
Double Buffered Latches
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
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_OUT) can be used
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_OUT) pin allows the
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
FUNCTIONAL BLOCK DIAGRAM
UNI/
BIP CLR ₁₇
OR LBE
HBE ¹⁸
SER ¹⁹
CLR ²⁰
LDAC ²¹
REF IN 25
MSB/ _18/16
S_IN LSB SERIAL
OR OR OR
CS DB0 DB1 DB2
DB7
16
14 13 12
7
AD760
16/18-BIT
INPUT REGISTER
10k
16/18-BIT DAC LATCH
10k
9.95k
MAIN DAC
RAM
REF OUT 26 ^+10V
REF
CALIBRATION DAC
15 S_OUT
24 ^SPAN/
BIP
OFF
23 V_OUT
27 MUX_OUT
28 MUX_IN
22 AGND
CALIBRATION SEQUENCER
1
CALOK
2
CAL
3
–V_EE
4
+V_CC
5
+V_LL
6
DGND
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.
0.75
V_OUT = –10V TO +10V
R_L = 2kΩ
C_L = 1000pF
0.25
0
–0.25
–0.75
0
16384
32768
49152
INPUT CODE – Decimal
Typical Integral Nonlinearity
65535
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.
DACPORT is a registered trademark of Analog Devices, Inc.
© Analog Devices, Inc., 1995
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
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