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AD7541 Datasheet(PDF) 7 Page - Intersil Corporation

No. de pieza AD7541
Descripción Electrónicos  12-Bit, Multiplying D/A Converter
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Fabricante Electrónico  INTERSIL [Intersil Corporation]
Página de inicio  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

AD7541 Datasheet(HTML) 7 Page - Intersil Corporation

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7
Dynamic Performance
The dynamic performance of the DAC, also depends on the
output amplifier selection. For low speed or static
applications, AC specifications of the amplifier are not very
critical. For high-speed applications slew-rate, settling-time,
openloop gain and gain/phase-margin specifications of the
amplifier should be selected for the desired performance.
The output impedance of the AD7541 looking into IOUT1
varies between 10k
Ω (R
FEEDBACK alone) and 5kΩ
(RFEEDBACK in parallel with the ladder resistance).
Similarly the output capacitance varies between the
minimum and the maximum values depending on the input
code. These variations necessitate the use of compensation
capacitors, when high speed amplifiers are used.
A capacitor in parallel with the feedback resistor (as shown
in Figure 10) provides the necessary phase compensation to
critically damp the output.
A small capacitor connected to the compensation pin of the
amplifier may be required for unstable situations causing
oscillations. Careful PC board layout, minimizing parasitic
capacitances, is also vital.
FIGURE 7. OUTPUT CAPACITANCE TEST CIRCUIT
FIGURE 8. FEEDTHROUGH ERROR TEST CIRCUIT
FIGURE 9. OUTPUT CURRENT SETTLING TIME TEST CIRCUIT
Test Circuits (Continued)
SCOPE
AD7541
17
16
18
1
2
3
17
5
4
BIT 1 (MSB)
BIT 12 (LSB)
+15V
NC
+15V
NC
1K
100mVP-P
1MHz
HA2600
AD7541
17
16
18
1
2
3
15
5
4
+15V
VOUT
IOUT1
IOUT2
3
2
6
GND
VREF = 20VP-P 10kHz SINE WAVE
BIT 1 (MSB)
BIT 12 (LSB)
VREF
+15V
+10V
BIT 1 (MSB)
BIT 12 (LSB)
AD7541
EXTRAPOLATE
+100mV
100
IOUT2
GND
+5V
0V
DIGITAL INPUT
17
16
1
2
3
15
5
4
OSCILLOSCOPE
3t: 5% SETTLING
9t: 0.01% SETTLING
VREF
+15V
+10V
BIT 1 (MSB)
BIT 12 (LSB)
AD7541
RFEEDBACK
IOUT2
GND
17
16
1
2
3
15
5
4
BIT 2
18
IOUT1
A
-
+
VOUT
CC
FIGURE 10. GENERAL DAC CIRCUIT WITH COMPENSATION CAPACITOR, CC
AD7541


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