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Número de pieza | AD565A | |
Descripción | High Speed 12-Bit Monolithic D/A Converters | |
Fabricantes | Analog Devices | |
Logotipo | ||
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High Speed 12-Bit
Monolithic D/A Converters
FEATURES
Single Chip Construction
Very High Speed Settling to 1/2 LSB
AD565A: 250 ns max
AD566A: 350 ns max
Full-Scale Switching Time: 30 ns
Guaranteed for Operation with ؎12 V (565A) Supplies,
with –12 V Supply (AD566A)
Linearity Guaranteed Overtemperature
1/2 LSB max (K, T Grades)
Monotonicity Guaranteed Overtemperature
Low Power: AD566A = 180 mW max;
AD565A = 225 mW max
Use with On-Board High Stability Reference (AD565A)
or with External Reference (AD566A)
Low Cost
MlL-STD-883-Compliant Versions Available
AD566A is obsolete
PRODUCT DESCRIPTION
The AD565A and AD566A are fast 12-bit digital-to-analog
converters that incorporate the latest advances in analog circuit
design to achieve high speeds at low cost.
The AD565A and AD566A use 12 precision, high speed bipolar
current-steering switches, a control amplifier, and a laser-trimmed
thin-film resistor network to produce a very fast, high accuracy
analog output current. The AD565A also includes a buried
Zener reference that features low noise, long-term stability, and
temperature drift characteristics comparable to the best discrete
reference diodes.
The combination of performance and flexibility in the AD565A and
AD566A has resulted from major innovations in circuit design,
an important new high speed bipolar process, and continuing
advances in laser-wafer-trimming techniques (LWT). The
AD565A and AD566A have a 10%–90% full-scale transition
time less than 35 ns and settle to within ±1/2 LSB in 250 ns max
(350 ns for AD566A). Both are laser-trimmed at the wafer level
to ± 1/8 LSB typical linearity and are specified to ± 1/4 LSB max
error (K and T grades) at +25°C. High speed and accuracy make
the AD565A and AD566A the ideal choice for high speed display
drivers as well as for fast analog-to-digital converters.
The laser trimming process that provides the excellent linearity
is also used to trim both the absolute value and the temperature
coefficient of the reference of the AD565A, resulting in a typical
full-scale gain TC of 10 ppm/°C. When tighter TC performance
is required or when a system reference is available, the AD566A
may be used with an external reference.
TheAD566Aisnolongeravailable.
REV. F
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
AD565A
FUNCTIONAL BLOCK DIAGRAMS
REF OUT
VCC
BIPOLAR OFF
REF
IN
REF
GND
10V
19.95k⍀
20k⍀
AD565A
0.5mA
9.95k⍀
IREF
DAC
IOUT =
4 ؋ IREF ؋ CODE
5k⍀
5k⍀
IO 8k⍀
20V SPAN
10V SPAN
DAC OUT
CODE INPUT
–VEE
REF
IN
19.95k⍀
REF
GND
20k⍀
POWER MSB
GND
LSB
BIPOLAR OFF
AD566A
0.5mA
9.95k⍀
IREF
DAC
IOUT =
4 ؋ IREF ؋ CODE
5k⍀
5k⍀
IO 8k⍀
20V SPAN
10V SPAN
DAC OUT
CODE INPUT
–VEE
POWER MSB
GND
LSB
AD565A and AD566A are available in four performance
grades. The J and K grades are specified for use over the 0°C to
+70°C temperature range while the S and T grades are speci-
fied for the –55°C to +125°C range. The D grades are all pack-
aged in a 24-lead, hermetically sealed, ceramic, dual-in-line
package. The JR grade is packaged in a 28-lead plastic SOIC.
PRODUCT HIGHLIGHTS
1. The wide output compliance range of the AD565A and
AD566A are ideally suited for fast, low noise, accurate voltage
output configurations without an output amplifier.
2. The devices incorporate a newly developed, fully differential,
nonsaturating precision current switching cell structure that
combines the dc accuracy and stability first developed in the
AD562/AD563 with very fast switching times and an optimally
damped settling characteristic.
3. The devices also contain SiCr thin-film application resistors
that can be used with an external op amp to provide a preci-
sion voltage output or as input resistors for a successive-
approximation A/D converter. The resistors are matched to
the internal ladder network to guarantee a low gain temperature
coefficient and are laser-trimmed for minimum full-scale and
bipolar offset errors.
4. The AD565A and AD566A are available in versions compliant
with MIL-STD-883. Refer to the Analog Devices Military
Products Databook or current /883B data sheet for detailed
specifications.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/461-3113
© Analog Devices, Inc., 2015
1 page AD566A–SPECIFICATIONS(TA = 25؇C, VEE = –15 V, unless otherwise noted)
Parameter
AD566AJ
Min Typ
Max
AD566AK
Min Typ Max
DATA INPUTS1 (Pins 13 to 24)
TTL or 5 V CMOS
Input Voltage
Bit ON Logic “1”
Bit OFF Logic “0”
Logic Current (Each Bit)
Bit ON Logic “1”
Bit OFF Logic “0”
2.0 5.5
0 0.8
120 300
35 100
2.0
0
5.5
0.8
120 300
35 100
RESOLUTION
12 12
OUTPUT
Current
Unipolar (All Bits On)
Bipolar (All Bits On or Off)
Resistance (Exclusive of Span Resistors)
Offset
Unipolar (Adjustable to Zero per Figure 3)
Bipolar (Figure 4, R1 and R2 = 50 Ω Fixed)
Capacitance
Compliance Voltage
TMIN to TMAX
ACCURACY (Error Relative to
Full Scale) 25°C
TMIN to TMAX
–1.6
؎0.8
6
–1.5
–2.0
± 1.0
8
0.01
0.05
25
± 1/4
(0.006)
± 1/2
(0.012)
–2.4
؎1.2
10
0.05
0.15
+10
؎1/2
(0.012)
؎3/4
(0.018)
–1.6
؎0.8
6
–1.5
–2.0
± 1.0
8
0.01
0.05
25
± 1/8
(0.003)
± 1/4
(0.006)
–2.4
؎1.2
10
0.05
0.1
+10
؎0.35
(0.0084)
؎1/2
(0.012)
DIFFERENTIAL NONLINEARITY
25°C
TMIN to TMAX
TEMPERATURE COEFFICIENTS
Unipolar Zero
Bipolar Zero
Gain (Full Scale)
Differential Nonlinearity
± 1/2 ؎3/4
± 1/4 ؎1/2
MONOTONICITY GUARANTEED MONOTONICITY GUARANTEED
12
5 10
7 10
2
12
5 10
35
2
SETTLING TIME TO 1/2 LSB
All Bits ON-to-OFF or OFF-to-ON
250 350
250 350
FULL-SCALE TRANSITION
10% to 90% Delay plus Rise Time
90% to 10% Delay plus Fall Time
15 30
30 50
15 30
30 50
POWER REQUIREMENTS
VEE, –11.4 to –16.5 V dc
POWER SUPPLY GAIN SENSITIVITY2
VEE = –11.4 to –16.5 V dc
PROGRAMMABLE OUTPUT RANGES
(see Figures 3, 4, 5)
–12 –18
15 25
0 to +5
–2.5 to +2.5
0 to +10
–5 to +5
–10 to +10
–12 –18
15 25
0 to +5
–2.5 to +2.5
0 to +10
–5 to +5
–10 to +10
EXTERNAL ADJUSTMENTS
Gain Error with Fixed 50 Ω
Resistor for R2 (Figure 3)
Bipolar Zero Error with Fixed
50 Ω Resistor for R1 (Figure 4)
Gain Adjustment Range (Figure 3)
Bipolar Zero Adjustment Range
± 0.25
± 0.15
± 0.1
± 0.05
؎0.25
؎0.15
± 0.25
± 0.15
± 0.1
± 0.05
؎0.25
؎0.1
REFERENCE INPUT
Input Impedance
15 20 25
15
20 25
POWER DISSIPATION
180 300
180 300
MULTIPLYING MODE PERFORMANCE (All Models)
Quadrants
Reference Voltage
Accuracy
Reference Feedthrough (Unipolar Mode,
All Bits OFF, and 1 V to 10 V [p-p], Sine Wave
Frequency for 1/2 LSB [p-p] Feedthrough)
Output Slew Rate 10%–90%
90%–10%
Output Settling Time (All Bits ON and a 0 V–10 V
Step Change in Reference Voltage)
Two (2): Bipolar Operation at Digital Input Only
1 V to 10 V, Unipolar
10 Bits (± 0.05% of Reduced F.S.) for 1 V dc Reference Voltage
40
5
1
1.5 μs to 0.01% F.S.
CONTROL AMPLIFIER
Full Power Bandwidth
Small-Signal Closed-Loop Bandwidth
300
1.8
NOTES
1The digital input levels are guaranteed but not tested over the temperature range.
2The power supply gain sensitivity is tested in reference to a VEE of –1.5 V dc.
Specifications subject to change without notice.
Unit
V
V
μA
μA
Bits
mA
mA
kΩ
% of F.S. Range
% of F.S. Range
pF
V
LSB
% of F.S. Range
LSB
% of F.S. Range
LSB
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ns
ns
ns
mA
ppm of F.S./%
V
V
V
V
V
% of F.S. Range
% of F.S. Range
% of F.S. Range
% of F.S. Range
kΩ
mW
kHz typ
mA/μs
mA/μs
kHz
MHz
–4– REV. F
5 Page AD565A
FIGURE 6. OTHER VOLTAGE RANGES
The AD566A can also be easily configured for a unipolar 0 V to
+5 V range or ± 2.5 V and ± 10 V bipolar ranges by using the
additional 5 kΩ application resistor provided at the 20 V span R
terminal, Pin 11. For a 5 V span (0 V to +5 V or ± 2.5 V), the two
5 kΩ resistors are used in parallel by shorting Pin 11 to Pin 9 and
connecting Pin 10 to the op amp output and the bipolar offset
resistor either to ground for unipolar or to VREF for the bipolar
range. For the ±10 V range (20 V span), use the 5 kΩ resistors in
series by connecting only Pin 11 to the op amp output and the
bipolar offset connected as shown. The ± 10 V option is shown
in Figure 6.
R1
5k⍀
BIPOLAR OFF
14k⍀
AD566A
9.95k⍀ 5k⍀
R2
5k⍀
REF
IN 19.95k⍀
0.5mA
–V 7.5V EREF
AD561
20k⍀
IREF
REF
GND
POWER
GND
5k⍀
IO 8k⍀
DAC
IOUT =
4 ؋ IREF
؋ CODE
CODE
INPUT
20V SPAN
10V SPAN
10pF
DAC
OUT
AD509
2.4k⍀
R3
26k⍀*
–VEE
MSB
LSB
* THE PARALLEL COMBINATION OF THE BIPOLAR OFFSET RESISTOR
AND R3 ESTABLISHES A CURRENT TO BALANCE THE MSB CURRENT.
THE EFFECT OF TEMPERATURE COEFFICIENT MISMATCH BETWEEN
THE BIPOLAR RESISTOR COMBINATION AND DAC RESISTORS IS
EXPANDED ON PREVIOUS PAGE.
Figure 6. ±10 V Voltage Output
Table I. Digital Input Codes
DIGITAL INPUT
MSB
LSB
Straight Binary
ANALOG OUTPUT
Offset Binary
000000000000
011111111111
100000000000
111111111111
Zero
Mid Scale – 1 LSB
+1/2 FS
+FS – l LSB
–FS
Zero – 1 LSB
Zero
+FS – 1 LSB
*Inverts the MSB of the offset binary code with an external inverter to obtain twos complement.
Twos Complement*
Zero
+FS – 1 LSB
–FS
Zero – 1 LSB
–10–
REV.F
11 Page |
Páginas | Total 13 Páginas | |
PDF Descargar | [ Datasheet AD565A.PDF ] |
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