AD7836 Analog Devices, AD7836 Datasheet

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AD7836

Manufacturer Part Number
AD7836
Description
Quad 14-Bit CMOS DAC on One Monolithic Chip
Manufacturer
Analog Devices
Datasheet

Specifications of AD7836

Resolution (bits)
14bit
Dac Update Rate
62.5kSPS
Dac Settling Time
16µs
Max Pos Supply (v)
+15.75V
Single-supply
No
Dac Type
Voltage Out
Dac Input Format
Par

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a
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
Four 14-Bit DACs in One Package
Voltage Outputs
Separate Offset Adjust for Each Output
Reference Range of
Maximum Output Voltage Range of
Clear Function to User-Defined Code
44-Pin MQFP Package
APPLICATIONS
Process Control
Automatic Test Equipment
General Purpose Instrumentation
DB13
DB0
WR
CS
A0
A1
A2
14
DGND
AD7836
ADDRESS
BUFFER
DECODE
INPUT
V
5 V
CC
AGND
V
SS
14
14
V
DD
DATA
DATA
DATA
DATA
DATA
REG
REG
REG
REG
REG
A
B
C
D
E
10 V
14
14
FUNCTIONAL BLOCK DIAGRAM
MUX
MUX
MUX
MUX
SEL
V
V
REF
REF
X1
X1
(+)A
(+)D V
DAC A
DAC D
V
REF
REF
X1
X1
GENERAL DESCRIPTION
The AD7836 contains four 14-bit DACs on one monolithic
chip. It has output voltages with a full-scale range of ± 10 V
from reference voltages of ± 5 V.
The AD7836 accepts 14-bit parallel loaded data from the exter-
nal bus into one of the input latches under the control of the
WR, CS and DAC channel address pins, A0–A2.
The DAC outputs are updated individually, on reception of new
data. In addition, the SEL input can be used to apply the user
programmed value in DAC Register E to all DACs, thus setting
all DAC output voltages to the same level. The contents of the
DAC data registers are not affected by the SEL input.
Each DAC output is buffered with a gain of two amplifier into
which an external DAC offset voltage can be inserted via the
DUTGNDx pins.
The AD7836 is available in a 44-lead MQFP package.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
(–)A V
(–)D V
REF
REF
X1
X1
(+)B V
(+)C V
DAC B
DAC B
REF
REF
X1
X1
(–)B
(–)C
World Wide Web Site: http://www.analog.com
CLR
Quad 14-Bit DAC
R
R
R
R
R
R
R
R
© Analog Devices, Inc., 1999
DUTGND A
DUTGND B
DUTGND C
DUTGND D
V
V
V
V
OUT
OUT
OUT
OUT
AD7836
A
B
C
D
LC
2
MOS

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AD7836 Summary of contents

Page 1

... The AD7836 contains four 14-bit DACs on one monolithic chip. It has output voltages with a full-scale range of ± from reference voltages of ± The AD7836 accepts 14-bit parallel loaded data from the exter nal bus into one of the input latches under the control of the WR, CS and DAC channel address pins, A0– ...

Page 2

... AD7836–SPECIFICATIONS Parameter A ACCURACY Resolution 14 ± 2 Relative Accuracy ± 0.9 Differential Nonlinearity ± 8 Full-Scale Error ± 8 Zero-Scale Error ± 2 Gain Error 2 Gain Temperature Coefficient Crosstalk 50 REFERENCE INPUTS DC Input Resistance 100 ± 1 Input Current V (+) Range 0/+5 REF V (–) Range –5/0 REF [V (+) – V (– ...

Page 3

... Figure 1. Timing Diagram –3– AD7836 = –15 V 5%; AGND = DGND = 0 V) Description A0, A1 Setup Time A0, A1 Hold Time Setup Time Hold Time WR Pulsewidth Data Setup Time Data Hold Time WR Pulse Interval Settling Time ...

Page 4

... 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 AD7836 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 5

... WR Level-Triggered Write Input (active low), when active and used in conjunction with CS to write data to the AD7836 input buffer. Data is latched into the selected data register on the rising edge of WR. DUTGND A Device Sense Ground for DAC A. Vout A is referenced to the voltage applied to this pin. ...

Page 6

... When CLR signal is brought back high the output voltages from the DACs will reflect the data stored in the relevant DAC registers. Data Loading to the AD7836 (–) = –5 V Data is loaded into the AD7836 in straight parallel 14-bit wide REF words. The DAC output voltages, V reflect new data in the DAC input registers. ...

Page 7

... TEMPERATURE – °C Figure 5. Typical DNL Error vs. Temperature 0.7 VERT = 100mV/DIV 0.6 HORIZ = 1 s/DIV 0.5 0.4 0.3 0.2 0.1 0 –0.1 –0.2 Figure 8. Typical Digital/Analog Glitch Impulse REV. A Typical Performance Characteristics–AD7836 0.9 0.6 0.4 0.2 0.0 –0.2 –0.4 –0.6 –0 INPUT CODE/1000 Figure 3. Typical DNL Plot 15V ...

Page 8

... V REF REF For V (+) = +5 V, and V REF = 20 V/16384 = 1220 µV. ) CONTROLLED POWER-ON OF THE OUTPUT STAGE OUT A block diagram of the output stage of the AD7836 is shown (16383/16384) V REF Figure 13 capable of driving a load of 5 kΩ in parallel 2 V (8192/16384) V REF with 50 pF ...

Page 9

... V OUT Figure 16. Output Stage After CLR Is Taken High Power-On with CLR High If CLR is high on the application of power to the device, the output stages of the AD7836 are configured as in Figure 17 while thereby connecting the output of the DAC to the input of its output amplifier. G < ...

Page 10

... Digital and analog ground planes should only be joined at one place. If the AD7836 is the only device requiring an AGND to DGND connection, then the ground planes should be connected at the AGND and DGND pins of the AD7836 ...

Page 11

... V The AD7836 uses nominal reference values of ± achieve DEVICE OUT GND an output span of ± Since the AD7836 has a gain of two C OUT from the reference inputs to the DAC output, adjusting the ref- DEVICE erence voltages by ± 150 mV will adjust the DAC offset and ...

Page 12

... SCLK LOGIC LEVEL CONTROLLER DATA BUS Figure 22. Programmable Reference Generation for the AD7836 the digital signals driving the DACs need to be level shifted from the range to the – range. Figure 22 shows a typical application circuit to provide programmable ref- erence capabilities for the AD7836 ...

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