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Analog Devices Semiconductor Electronic Components Datasheet



AD660

Monolithic 16-Bit Serial/Byte DACPORT



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AD660 pdf
a
Monolithic 16-Bit
Serial/Byte DACPORT
AD660
FEATURES
Complete 16-Bit D/A Function
On-Chip Output Amplifier
On-Chip Buried Zener Voltage Reference
؎1 LSB Integral Linearity
15-Bit Monotonic over Temperature
Microprocessor Compatible
Serial or Byte Input
Double Buffered Latches
Fast (40 ns) Write Pulse
Asynchronous Clear (to 0 V) Function
Serial Output Pin Facilitates Daisy Chaining
Unipolar or Bipolar Output
Low Glitch: 15 nV-s
Low THD+N: 0.009%
FUNCTIONAL BLOCK DIAGRAM
UNI/BIP CLR/
LBE CS
15 14
SIN/ MSB/LSB/
DB0 DB1 DB7
12 11
5
HBE 16
SER 17
CLR 18
CONTROL
LOGIC
16-BIT LATCH
16-BIT LATCH
LDAC 19
REF IN 23
10k
16-BIT DAC
+10V REF
24 1 2
REF OUT –VEE +VCC
AD660
10k
10.05k
13 SOUT
22 SPAN/
BIP
OFFSET
21 VOUT
34
+VLL DGND
20 AGND
PRODUCT DESCRIPTION
The AD660 DACPORT® is a complete 16-bit monolithic D/A
converter with an on-board voltage reference, double buffered
latches and output amplifier. It is manufactured on Analog De-
vices’ BiMOS II process. This process allows the fabrication of
low power CMOS logic functions on the same chip as high pre-
cision bipolar linear circuitry.
The AD660’s architecture ensures 15-bit monotonicity over
time and temperature. Integral and differential nonlinearity is
maintained at ± 0.003% max. The on-chip output amplifier pro-
vides a voltage output settling time of 10 µs to within 1/2 LSB
for a full-scale step.
The AD660 has an extremely flexible digital interface. Data can
be loaded into the AD660 in serial mode or as two 8-bit bytes.
This is made possible by two digital input pins which have dual
functions. The serial mode input format is pin selectable to be
MSB or LSB first. The serial output pin allows the user to daisy
chain several AD660s by shifting the data through the input
latch into the next DAC thus minimizing the number of control
lines required to SIN, CS and LDAC. The byte mode input for-
mat is also flexible in that the high byte or low byte data can be
loaded first. The double buffered latch structure eliminates data
skew errors and provides for simultaneous updating of DACs in
a multi-DAC system.
The AD660 is available in five grades. AN and BN versions are
specified from –40°C to +85°C and are packaged in a 24-pin
300 mil plastic DIP. AR and BR versions are also specified from
–40°C to +85°C and are packaged in a 24-pin SOIC. The SQ
version is packaged in a 24-pin 300 mil cerdip package and is
also available compliant to MIL-STD-883. Refer to the AD660/
883B data sheet for specifications and test conditions.
PRODUCT HIGHLIGHTS
1. The AD660 is a complete 16-bit DAC, with a voltage refer-
ence, double buffered latches and output amplifier on a sin-
gle chip.
2. The internal buried Zener reference is laser trimmed to
10.000 volts with a ± 0.1% maximum error and a tempera-
ture drift performance of ± 15 ppm/°C. The reference is
available for external applications.
3. The output range of the AD660 is pin programmable and can
be set to provide a unipolar output range of 0 V to +10 V or
a bipolar output range of –10 V to +10 V. No external com-
ponents are required.
4. The AD660 is both dc and ac specified. DC specifications
include ± 1 LSB INL and ± 1 LSB DNL errors. AC specifi-
cations include 0.009% THD+N and 83 dB SNR.
5. The double buffered latches on the AD660 eliminate data
skew errors and allow simultaneous updating of DACs in
multi-DAC applications.
6. The CLEAR function can asynchronously set the output to
0 V regardless of whether the DAC is in unipolar or bipolar
mode.
7. The output amplifier settles within 10 µs to ± 1/2 LSB for a
full-scale step and within 2.5 µs for a 1 LSB step over tem-
perature. The output glitch is typically 15 nV-s when a full-
scale step is loaded.
DACPORT is a registered trademark of Analog Devices, Inc.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703



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AD660 pdf
AD660–SPECIFICATIONS (TA = +25؇C, VCC = +15 V, VEE = –15 V, VLL = +5 V unless otherwise noted)
Parameter
AD660AN/AR/SQ
Min Typ Max
AD660BN/BR
Min Typ Max
Units
RESOLUTION
16 16 Bits
DIGITAL INPUTS (TMIN to TMAX)
VIH (Logic “1”)
VIL (Logic “0”)
IIH (VIH = 5 5 V)
IIL (VIL = 0 V)
TRANSFER FUNCTION CHARACTERISTICS1
Integral Nonlinearity
TMIN to TMAX
Differential Nonlinearity
TMIN to TMAX
Monotonicity Over Temperature
Gain Error2, 3
Gain Drift (TMIN to TMAX)
DAC Gain Error4
DAC Gain Drift4
Unipolar Offset
Unipolar Offset Drift (TMIN to TMAX)
Bipolar Zero Error
Bipolar Zero Error Drift (TMIN to TMAX)
2.0
0
14
5.5
0.8
± 10
± 10
±2
±4
±2
±4
± 0.10
25
± 0.05
10
± 2.5
3
± 7.5
5
REFERENCE INPUT
Input Resistance
Bipolar Offset Input Resistance
7 10 13
7 10 13
**
**
*
*
±1
±2
±1
±2
15
*
15
*
*
*
*
*
*
* **
* **
Volts
Volts
µA
µA
LSB
LSB
LSB
LSB
Bits
% of FSR
ppm/°C
% of FSR
ppm/°C
mV
ppm/°C
mV
ppm/°C
k
k
REFERENCE OUTPUT
Voltage
Drift
External Current5
Capacitive Load
Short Circuit Current
9.99 10.00 10.01 * * *
Volts
25 15 ppm/°C
24
**
mA
1000
* pF
25 * mA
OUTPUT CHARACTERISTICS
Output Voltage Range
Unipolar Configuration
Bipolar Configuration
Output Current
Capacitive Load
Short Circuit Current
0 +10
–10 +10
5
1000
25
**
**
*
*
*
Volts
Volts
mA
pF
mA
POWER SUPPLIES
Voltage
VCC6
VEE6
VLL
Current (No Load)
ICC
IEE
ILL
@ VIH, VIL = 5, 0 V
@ VIH, VIL = 2.4, 0.4 V
Power Supply Sensitivity
Power Dissipation (Static, No Load)
+13.5
–13.5
+4.5
+16.5
–16.5
+5.5
*
*
*
*
*
*
+12 +18
–12 –18
**
**
0.3 2
3 7.5
12
365 625
**
**
**
**
Volts
Volts
Volts
mA
mA
mA
mA
ppm/%
mW
TEMPERATURE RANGE
Specified Performance (A, B)
Specified Performance (S)
–40 +85 * * °C
–55 +125
°C
NOTES
1For 16-bit resolution, 1 LSB = 0.0015% of FSR. For 15-bit resolution, 1 LSB = 0.003% of FSR. For 14-bit resolution, 1 LSB = 0.006% of FSR. FSR stands for
Full-Scale Range and is 10 V in a Unipolar Mode and 20 V in Bipolar Mode.
2Gain error and gain drift are measured using the internal reference. The internal reference is the main contributor to gain drift. If lower gain drift is required, the
AD660 can be used with a precision external reference such as the AD587, AD586 or AD688.
3Gain Error is measured with fixed 50 resistors as shown in the Application section. Eliminating these resistors increases the gain error by 0.25% of FSR (Unipolar
mode) or 0.50% of FSR (Bipolar mode).
4DAC Gain Error and Drift are measured with an external voltage reference. They represent the error contributed by the DAC alone, for use with an external reference.
5External current is defined as the current available in addition to that supplied to REF IN and SPAN/BIPOLAR OFFSET on the AD660.
6Operation 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.
*Indicates that the specification is the same as AD660AN/AR/SQ.
Specifications subject to change without notice.
–2– REV. A



Part Number AD660
Description Monolithic 16-Bit Serial/Byte DACPORT
Maker Analog Devices - Analog Devices
Total Page 12 Pages
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