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PDF DAC16GBC Data sheet ( Hoja de datos )

Número de pieza DAC16GBC
Descripción 16-Bit High Speed Current-Output DAC
Fabricantes Analog Devices 
Logotipo Analog Devices Logotipo



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a
FEATURES
؎1 LSB Differential Linearity (max)
Guaranteed Monotonic Over Temperature Range
؎2 LSB Integral Linearity (max)
500 ns Settling Time
5 mA Full-Scale Output
TTL/CMOS Compatible
Low Power: 190 mW (typ)
Available in Die Form
APPLICATIONS
Communications
ATE
Data Acquisition Systems
High Resolution Displays
16-Bit High Speed
Current-Output DAC
DAC16
FUNCTIONAL BLOCK DIAGRAM
IREF
REF GND
VCC
AGND
VEE
DGND
BUFFER
DAC16
CCOMP
DAC
IOUT
DB0 (LSB)
DB15 (MSB)
GENERAL DESCRIPTION
The DAC16 is a 16-bit high speed current-output digital-to-
analog converter with a settling time of 500 ns. A unique com-
bination of low distortion, high signal-to-noise ratio, and high
speed make the DAC16 ideally suited to performing waveform
synthesis and modulation in communications, instrumentation,
and ATE systems. Input reference current is buffered, with full-
scale output current of 5 mA. The 16-bit parallel digital input
bus is TTL/CMOS compatible. Operating from +5 V and
–15 V supplies, the DAC16 consumes 190 mW (typ) and is
available in a 24-lead epoxy DIP, epoxy surface-mount small
outline (SOL), and in die form.
0.1
0.01
VLOGIC = +5V
TURNING OFF
VLOGIC = 0V
TURNING ON
IFS = 4mA
TA = 25؇C
0.001
0
100 200 300 400 500 600 700 800
SETTLING TIME – ns
Figure 1. DAC16 Settling Time Accuracy vs. Percent of
Full Scale
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999

1 page




DAC16GBC pdf
Typical Performance Characteristics–DAC16
Digital Input Considerations
The threshold of the DAC16’s digital input circuitry is set at
1.4 V, independent of supply voltage. Hence, the digital inputs
can interface with any type of 5 V logic. Illustrated in Figure 5 is
the equivalent circuit of the digital inputs. Note that the indi-
vidual input capacitance is approximately 7 pF.
+5V +0.7V
DBX
Q1
R2
75k
R1
20k
Q2
Q3
R3
28k
TO DAC
SWITCH
–15V
–0.7V
Figure 5. Equivalent Circuit of a DAC16 Digital Input
This input capacitance can be used in conjunction with an ex-
ternal R-C circuit for digital signal deskewing, if required. In
applications where some of the DAC16’s digital inputs are
not used, the recommended procedure to turn off one or more
inputs is to connect each input line to +5 V as shown in
Figure 6.
+5V
DAC16
DB0
DB1
Figure 6. Handling Unused DAC16 Digital Inputs
4
VCC = +5V
3 VEE = –15V
TA = +25؇C
2
1 +INL
0
–1
–INL
–2
–3
–4
0.2
0.3 0.4 0.5 0.6
REFERENCE CURRENT – mA
0.7
Figure 7. Integral Nonlinearity vs. IREF
2.0
VCC = +5V
1.5 VEE = –15V
TA = +25؇C
1.0
0.5
+DNL
0
–0.5
–DNL
–1.0
–1.5
–2.0
0.2
0.3 0.4 0.5 0.6
REFERENCE CURRENT – mA
0.7
Figure 8. Differential Nonlinearity
vs. IREF
1.0
VCC = +5V
0.8 VEE = –15V
IREF = 0.5mA
0.6
0.4
0.2
0
–40 –20 0 20 40 60 80
TEMPERATURE – ؇C
Figure 9. Zero Scale Output vs.
Temperature
15
VCC = +5V
10 VEE = –15V
IREF = 0.5mA
5
0
–5
–10
–15
–40 –20 0 20 40 60 80
TEMPERATURE – ؇C
Figure 10. Gain Error vs.
Temperature
4
+INL
2
–INL
0
–2
VCC = +5V
VEE = –15V
IREF = 0.5mA
–4
–40 –20 0 20 40 60 80
TEMPERATURE – ؇C
Figure 11. Integral Nonlinearity
vs. Temperature
1.5
VCC = +5V
1.0 VEE = –15V
IREF = 0.5mA
0.5
+DNL
0
–0.5
–DNL
–1.0
–1.5
–40 –20 0 20 40 60 80
TEMPERATURE – ؇C
Figure 12. Differential Nonlinearity
vs. Temperature
REV. B
–5–

5 Page





DAC16GBC arduino
DAC16
–15V
20k
1.6k
INPUT
200
+15V
IN4735
14
13
M1
16
360
360
+5V
MC10124
T/ H
–5V
0.39F
TO PIN 2
SD5000
249169
–5V
Q1 Q2
169
510–5V
–15V
249
Q1, Q2 = MPS571
M1 – M4 = SD5000
200
11 12
M2
9
100pF
6
8
M3
5
34
M4
1
AD841
OUTPUT
500pF
75
Figure 27. A High Performance Deglitching Circuit
A discrete drive circuit is used to achieve the best performance
from the SD5000 quad DMOS switch. This switch-driving cell
is composed of MPS571 RF NPN transistors and an MC10124
TTL-to-ECL translator. Using this technique provides both
high speed and highly symmetrical drive signals for the SD5000
switches. The switches arc arranged in a single-pole, double-
throw (SPDT) configuration. The 500 pF “flyback” capacitor is
switched to the op amp summing junction during the hold mode
to keep switching transients from feeding to the output. This ca-
pacitor is grounded during sample mode to minimize its effect
on acquisition time.
Careful circuit layout of the high speed SHA section is almost as
important as the design itself. Double-sided printed circuit
board, a compact layout, and short critical signal paths all ensure
best performance.
Op Amp Selection
When selecting the amplifier to be used for the DAC16’s I–V
converter, there are two main application areas; those requiring
high accuracy, and those seeking high speed. In high accuracy
applications, three parameters are of prime importance: (1)
input offset voltage. VOS; (2) input bias current, –IB; and (3) off-
set voltage drift, TCVOS. In these applications where 16-bit
performance must be maintained with an external reference
at +5 V, an op amp’s input offset voltage must be less than 15 µV
(0.1 LSB) with a bias current less than 6 nA. The op amp
must also exhibit high open-loop gain to keep the offset voltage
below this limit over the specified full-scale output range. Thus,
for a maximum output of 5 V, the op amp’s open loop gain
must be greater than 1300 V/mV.
For low frequency, high accuracy applications, Table IV lists
selected compatible operational amplifiers available from Analog
Devices. These operational amplifiers satisfy all the above
requirements and in most all cases will not require offset voltage
nulling.
Table V. Precision Operational Amplifier the DAC16
Model
OP177
OP77
OP27
OP97
VOS
10 µV
25 µV
25 µV
25 µV
TCVOS
0.3 µV/°C
0.6 µV/°C
0.3 µV/°C
2 µV/°C
IB
2 nA
2.8 nA
80 nA
0.15 nA
AVOL
12000 V/mV
2000 V/mV
1500 V/mV
2000 V/mV
In high speed applications where resolution is more important
than absolute accuracy, operational amplifiers such as the
AD843 offer the requisite settling time. Although these amplifi-
ers are not specified for 16-bit performance, their settling times
are two to three times faster than the DAC16 and will introduce
negligible error to the overall circuit’s settling time. It is possible
to estimate the 16-bit settling time of an operational amplifier if
its 12-bit settling time is known. Assuming that the op amp can
be modeled by a single-pole response, then the ratio of the op
amp’s 16-bit settling time to its 12-bit settling can be expressed
as:
ts(16 bit ) = 1.33
ts(12 bit )
Since many operational amplifier data sheets provide charts
illustrating 0.01% settling time versus output voltage step size,
all that is required to estimate an op amp’s 16-bit settling time is
to multiply the 12-bit settling time for the required full-scale
voltage by 1.33. The circuit’s overall settling time can then be
approximated by the root-sum-square method:
tS = (tDAC )2 + (tOA )2
where
tDAC = DAC16’s specified full-scale settling time
tOA = Op amp full-scale settling time
As a design aid, Table VI illustrates a high speed operational
amplifier selector guide for devices compatible with the DAC16
for high speed applications. All these devices exhibit the requi-
site settling time, input offset voltage, and input bias current
consistent with maximum performance.
Table VI. High Speed Operational Amplifiers for the DAC16
Model tS to %
VOS
TCVOS IB
AVOL
OP467 200 ns –0.01 0.5 mV 3.5 µV/°C 0.5 µA 20 V/mV
AD817 70 ns –0.01 2 mV 10 µV/°C 6.6 µA 6 V/mV
AD829 90 ns –0.1 0.5 mV 0.3 µV/°C 7 µA 100 V/mV
AD841 110 ns –0.01 1 mV 35 µV/°C 5 µA 45 V/mV
AD843 135 ns –0.01 1 mV 12 µV/°C 0.001 µA 25 V/mV
AD845 350 ns –0.01 0.25 mV 5 µV/°C 0.001 µA 500 V/mV
AD847 120 ns –0.01 1 mV 15 µV/°C 5 µA 5.5 V/mV
REV. B
–11–

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