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PDF AD5781 Data sheet ( Hoja de datos )

Número de pieza AD5781
Descripción Voltage Output DAC
Fabricantes Analog Devices 
Logotipo Analog Devices Logotipo



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Data Sheet
True 18-Bit, Voltage Output DAC
±0.5 LSB INL, ±0.5 LSB DNL
AD5781
FEATURES
Single 18-bit DAC, ±0.5 LSB INL
7.5 nV/√Hz noise spectral density
0.05 LSB long-term linearity stability
<0.05 ppm/°C temperature drift
1 µs settling time
1.4 nV-sec glitch impulse
Operating temperature range: −40°C to +125°C
20-lead TSSOP package
Wide power supply range of up to ±16.5 V
35 MHz Schmitt triggered digital interface
1.8 V compatible digital interface
APPLICATIONS
Medical instrumentation
Test and measurement
Industrial control
Scientific and aerospace instrumentation
Data acquisition systems
Digital gain and offset adjustment
Power supply control
GENERAL DESCRIPTION
The AD57811 is a single 18-bit, unbuffered voltage output DAC
that operates from a bipolar supply of up to 33 V. The AD5781
accepts a positive reference input range of 5 V to VDD − 2.5 V and
a negative reference input range of VSS + 2.5 V to 0 V. The
AD5781 offers a relative accuracy specification of ±0.5 LSB
maximum, and operation is guaranteed monotonic with a ±0.5
LSB DNL maximum specification.
The part uses a versatile 3-wire serial interface that operates at
clock rates of up to 35 MHz and is compatible with standard
SPI, QSPI™, MICROWIRE™, and DSP interface standards. The
part incorporates a power-on reset circuit that ensures that the
DAC output powers up to 0 V and in a known output impedance
state and remains in this state until a valid write to the device
takes place. The part provides an output clamp feature that
places the output in a defined load state.
FUNCTIONAL BLOCK DIAGRAM
VCC
VDD
VREFPF VREFPS
IOVCC
SDIN
SCLK
SYNC
SDO
LDAC
CLR
RESET
AD5781
INPUT
SHIFT
REGISTER
AND
CONTROL
LOGIC
18
DAC 18
REG
18-BIT
DAC
6.8kΩ 6.8kΩ
A1 R1 RFB RFB
INV
VOUT
6kΩ
POWER-ON-RESET
AND CLEAR LOGIC
DGND VSS AGND VREFNF VREFNS
Figure 1.
Table 1. Complementary Devices
Part No.
Description
AD8675
Ultraprecision, 36 V, 2.8 nV/√Hz rail-to-rail
output op amp
AD8676
Ultraprecision, 36 V, 2.8 nV/√Hz dual rail-to-
rail output op amp
ADA4898-1
High voltage, low noise, low distortion, unity
gain stable, high speed op amp
Table 2. Related Devices
Part No.
Description
AD5791
20-bit, 1 ppm accurate DAC
AD5541A/AD5542A 16-bit, 1 LSB accurate 5 V DAC
PRODUCT HIGHLIGHTS
1. True 18-Bit Accuracy.
2. Wide Power Supply Range of Up to ±16.5 V.
3. −40°C to +125°C Operating Temperature Range.
4. Low 7.5 nV/√Hz Noise.
5. Low 0.05 ppm/°C Temperature Drift.
1 Protected by U.S. Patent No 7884747, and other patents are pending.
Rev. D
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2010–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com

1 page




AD5781 pdf
AD5781
Data Sheet
Parameter
Midscale Glitch Impulse
MSB Segment Glitch Impulse6
Output Enabled Glitch Impulse
Digital Feedthrough
DC Output Impedance (Normal Mode)
DC Output Impedance (Output
Clamped to Ground)
Spurious Free Dynamic Range
Total Harmonic Distortion
REFERENCE INPUTS3
VREFP Input Range
VREFN Input Range
DC Input Impedance
Input Capacitance
LOGIC INPUTS3
Input Current8
Input Low Voltage, VIL
Input High Voltage, VIH
Pin Capacitance
LOGIC OUTPUT (SDO)3
Output Low Voltage, VOL
Output High Voltage, VOH
High Impedance Leakage Current
High Impedance Output Capacitance
POWER REQUIREMENTS
VDD
VSS
VCC
IOVCC
IDD
ISS
ICC
IOICC
DC Power Supply Rejection Ratio3, 9
AC Power Supply Rejection Ratio3
A, B Version1
Min Typ Max
3.1
1.7
1.4
9.1
3.6
1.9
45
0.4
3.4
6
100
97
Unit
nV-sec
nV-sec
nV-sec
nV-sec
nV-sec
nV-sec
nV-sec
nV-sec
kΩ
kΩ
dB
dB
5
VSS + 2.5 V
5
6.6
15
VDD − 2.5 V
0
V
kΩ
pF
−1
0.7 × IOVCC
5
+1
0.3 × IOVCC
µA
V
V
pF
IOVCC − 0.5 V
3
0.4
±1
V
µA
pF
7.5
VDD − 33
2.7
1.71
VSS + 33
−2.5
5.5
5.5
4.2 5.2
4 4.9
600 900
52 140
±0.6
±0.6
95
95
V
V
V
V
mA
mA
µA
µA
µV/V
µV/V
dB
dB
Test Conditions/Comments
VREFP = +10 V, VREFN = −10 V
VREFP = +10 V, VREFN = 0 V
VREFP = +5 V, VREFN = 0 V
VREFP = +10 V, VREFN = −10 V, see Figure 42
VREFP = 10 V, VREFN = 0 V, see Figure 43
VREFP = 5 V, VREFN = 0 V, see Figure 44
On removal of output ground clamp
1 kHz tone, 10 kHz sample rate
1 kHz tone, 10 kHz sample rate
VREFP, VREFN, code dependent,
typical at midscale code
VREFP, VREFN
IOVCC = 1.71 V to 5.5 V
IOVCC = 1.71 V to 5.5 V
IOVCC = 1.71 V to 5.5 V, sinking 1 mA
IOVCC = 1.71 V to 5.5 V, sourcing 1 mA
All digital inputs at DGND or IOVCC
IOVCC ≤ VCC
SDO disabled
VDD ± 10%, VSS = 15 V
VSS ± 10%, VDD = 15 V
VDD ± 200 mV, 50 Hz/60 Hz, VSS = −15 V
VSS ± 200 mV, 50 Hz/60 Hz, VDD = 15 V
1 Temperature range: −40°C to +125°C, typical conditions: TA = 25°C, VDD = +15 V, VSS = −15 V, VREFP = +10 V, VREFN = −10 V.
2 Performance characterized with AD8676BRZ voltage reference buffers and AD8675ARZ output buffer.
3 Linearity error refers to both INL error and DNL error; either parameter can be expected to drift by the amount specified after the length of time specified.
4 Valid for all voltage reference spans.
5 Guaranteed by design and characterization, not production tested.
6 The AD5781 is configured in the bias compensation mode with a low-pass RC filter on the output. R = 300 Ω, C = 143 pF (total capacitance seen by the output buffer,
lead capacitance, and so forth).
7 Includes noise contribution from AD8676BRZ voltage reference buffers.
8 Current flowing in an individual logic pin.
9 Includes PSRR of AD8676BRZ voltage reference buffers.
Rev. D | Page 4 of 28

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AD5781 arduino
AD5781
0.5
AD8676 REFERENCE BUFFERS
0.4 AD8675 OUTPUT BUFFER
VREFP = +5V
0.3 VREFN = 0V
TA = +125°C
TA = +25°C
TA = –40°C
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4 VDD = +15V
VSS = –15V
–0.5
0 50000
100000 150000 200000 250000
DAC CODE
Figure 11. Differential Nonlinearity Error vs. DAC Code, +5 V Span
0.5
AD8676 REFERENCE BUFFERS
0.4 AD8675 OUTPUT BUFFER
VREFP = +10V
0.3 VREFN = 0V
VDD = +15V
0.2 VSS = –15V
0.1
TA = +25°C
TA = –40°C
TA = +125°C
0
–0.1
–0.2
–0.3
–0.4
–0.5
0
50000
100000 150000
DAC CODE
200000
250000
Figure 12. Differential Nonlinearity Error vs. DAC Code, ±10 V Span,
X2 Gain Mode
0.5
AD8676 REFERENCE BUFFERS
0.4 AD8675 OUTPUT BUFFER
VDD = +15V
0.3 VSS = –15V
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
–55
±10V SPAN MAX INL
+5V SPAN MAX INL
+10V SPAN MIN INL
+10V SPAN MAX INL
±10V SPAN MIN INL
+5V SPAN MIN INL
–35 –15
5 25 45 65
TEMPERATURE (°C)
85 105
125
Figure 13. Integral Nonlinearity Error vs. Temperature
Data Sheet
0.3
AD8676 REFERENCE BUFFERS
0.2 AD8675 OUTPUT BUFFER
VDD = +15V
VSS = –15V
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
–55
±10V SPAN MAX DNL
+5V SPAN MAX DNL
+10V SPAN MIN DNL
–35 –15 5 25
+10V SPAN MAX DNL
±10V SPAN MIN DNL
+5V SPAN MIN DNL
45 65 85 105
125
TEMPERATURE (°C)
Figure 14. Differential Nonlinearity Error vs. Temperature
0.14
0.12
0.10 INL MAX
0.08
0.06
0.04
TA = 25°C
VREFP = +10V
VREFN = –10V
AD8676 REFERENCE BUFFERS
0.02 AD8675 OUTPUT BUFFER
0
–0.02
INL MIN
–0.04
–0.06
12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5
VDD/|VSS| (V)
Figure 15. Integral Nonlinearity Error vs. Supply Voltage, ±10 V Span
0.4
0.3
INL MAX
0.2
TA = 25°C
0.1 VREFP = +5V
VREFN = 0V
AD8676 REFERENCE BUFFERS
0 AD8675 OUTPUT BUFFER
–0.1
–0.2
INL MIN
–0.3
7.5 8.5 9.5 10.5 11.5 12.5 13.5 14.5 15.5 16.5
VDD (V)
–2.5 –3.9 –5.3 –6.7 –9.1 –10.5 –12.9 –14.2 –15.5 –16.5
VSS (V)
Figure 16. Integral Nonlinearity Error vs. Supply Voltage, +5 V Span
Rev. D | Page 10 of 28

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