AD5557CRU-REEL7 Analog Devices Inc, AD5557CRU-REEL7 Datasheet - Page 18

• Manufacturer Part Number: AD5557CRU-REEL7
• Description: IC,D/A CONVERTER,DUAL,14-BIT,TSSOP,38PIN
• Manufacturer: Analog Devices Inc

Specifications of AD5557CRU-REEL7

• Design Resources: Precision, Unipolar, Inverting Conversion Using AD5547/57 DAC (CN0026) Precision, Unipolar, Noninverting Configuration for the AD5547/57 DAC (CN0027) Precision, Bipolar, Configuration for AD5547/AD5557 DAC (CN0028)
• Settling Time: 500ns
• Number Of Bits: 14
• Data Interface: Parallel
• Number Of Converters: 2
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 55µW
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 38-TSSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

AD5547/AD5557
REFERENCE SELECTION
When selecting a reference for use with the AD55xx series of
current output DACs, pay attention to the output voltage,
temperature coefficient specification of the reference. Choosing
a precision reference with a low output temperature coefficient
minimizes error sources. Table 10 lists some of the references
available from Analog Devices, Inc., that are suitable for use
with this range of current output DACs.
AMPLIFIER SELECTION
The primary requirement for the current-steering mode is an
amplifier with low input bias currents and low input offset voltage.
Because of the code-dependent output resistance of the DAC,
the input offset voltage of an op amp is multiplied by the variable
gain of the circuit. A change in this noise gain between two
adjacent digital fractions produces a step change in the output
voltage due to the amplifier’s input offset voltage. This output
voltage change is superimposed upon the desired change in output
between the two codes and gives rise to a differential linearity error,
which, if large enough, can cause the DAC to be nonmonotonic.
Table 10. Suitable Analog Devices Precision References
Part No.
ADR01
ADR01
ADR02
ADR02
ADR03
ADR03
ADR06
ADR06
ADR420
ADR421
ADR423
ADR425
ADR431
ADR435
ADR391
ADR395
Table 11. Suitable Analog Devices Precision Op Amps
Part No.
OP97
OP1177
AD8675
AD8671
ADA4004-1
AD8603
AD8607
AD8605
AD8615
AD8616
Output Voltage (V)
10
10
5.0
5.0
2.5
2.5
3.0
3.0
2.048
2.50
3.00
5.00
2.500
5.000
2.5
5.0
Supply Voltage (V)
±2 to ±20
±2.5 to ±15
±5 to ±18
±5 to ±15
±5 to ±15
1.8 to 5
1.8 to 5
2.7 to 5
2.7 to 5
2.7 to 5
Initial Tolerance (%)
0.05
0.05
0.06
0.06
0.1
0.1
0.1
0.1
0.05
0.04
0.04
0.04
0.04
0.04
0.16
0.10
V
(μV)
25
60
75
75
125
50
50
65
65
65
OS
Maximum
I
(nA)
0.1
2
2
12
90
0.001
0.001
0.001
0.001
0.001
B
Maximum
Maximum Temperature
Drift (ppm/°C)
3
9
3
9
3
9
3
9
3
3
3
3
3
3
9
9
Rev. B | Page 18 of 20
0.1 Hz to 10 Hz
Noise (μV p-p)
0.5
0.4
0.1
0.077
0.1
2.3
2.3
2.3
2.4
2.4
The input bias current of an op amp also generates an offset at
the voltage output because of the bias current flowing in the
feedback resistor, R
Common-mode rejection of the op amp is important in voltage-
switching circuits because it produces a code-dependent error
at the voltage output of the circuit.
Provided that the DAC switches are driven from true wideband
low impedance sources (V
Consequently, the slew rate and settling time of a voltage-switching
DAC circuit is determined largely by the output op amp. To obtain
minimum settling time in this configuration, minimize capacitance
at the V
the DAC. This is done by using low input capacitance buffer
amplifiers and careful board design.
Analog Devices offers a wide range of amplifiers for both precision
dc and ac applications, as listed in Table 11 and Table 12.
REF
node (the voltage output node in this application) of
I
1
1
1
1
1
1
1
1
0.5
0.5
0.5
0.5
0.8
0.8
0.12
0.12
SS
(mA)
Supply Current (μA)
40
40
2000
2000
600
500
2300
3000
2000
1000
FB
.
Output Noise (μV p-p)
20
20
10
10
6
6
10
10
1.75
1.75
2
3.4
3.5
8
5
8
IN
and AGND), they settle quickly.
TSOT-5
MSOP-8, SOIC-8
TSOT-5
MSOP-8, SOIC-8
Package(s)
SOIC-8 , PDIP-8
MSOP-8, SOIC-8
MSOP-8, SOIC-8
MSOP-8, SOIC-8
SOIC-8, SOT-23-5
WLCSP-5, SOT-23-5
Package(s)
SOIC-8
TSOT-5, SC70-5
SOIC-8
TSOT-5, SC70-5
SOIC-8
TSOT-5, SC70-5
SOIC-8
TSOT-5, SC70-5
SOIC-8, MSOP-8
SOIC-8, MSOP-8
SOIC-8, MSOP-8
SOIC-8, MSOP-8
SOIC-8, MSOP-8
SOIC-8, MSOP-8
TSOT-5
TSOT-5