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AD712BH bảng dữ liệu(PDF) 7 Page - Analog Devices

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Giải thích chi tiết về linh kiện  Dual Precision, Low Cost, High Speed, BiFET Op Amp
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AD712BH bảng dữ liệu(HTML) 7 Page - Analog Devices

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AD712
REV. B
–7–
OPTIMIZING SETTLING TIME
Most bipolar high-speed D/A converters have current outputs;
therefore, for most applications, an external op amp is required
for current-to-voltage conversion. The settling time of the con-
verter/op amp combination depends on the settling time of the
DAC and output amplifier. A good approximation is:
t
S Total =
(t
S DAC )
2
+ (t
S AMP )
2
The settling time of an op amp DAC buffer will vary with the
noise gain of the circuit, the DAC output capacitance, and with
the amount of external compensation capacitance across the
DAC output scaling resistor.
Settling time for a bipolar DAC is typically 100 ns to 500 ns.
Previously, conventional op amps have required much longer
settling times than have typical state-of-the-art DACs; therefore,
the amplifier settling time has been the major limitation to a
high-speed voltage-output D-to-A function. The introduction of
the AD711/AD712 family of op amps with their 1
µs (to ±0.01%
of final value) settling time now permits the full high-speed
capabilities of most modern DACs to be realized.
In addition to a significant improvement in settling time, the
low offset voltage, low offset voltage drift, and high open-loop
gain of the AD711/AD712 family assures 12-bit accuracy over
the full operating temperature range.
The excellent high-speed performance of the AD712 is shown in
the oscilloscope photos of Figure 25. Measurements were taken
using a low input capacitance amplifier connected directly to the
summing junction of the AD712 – both photos show the worst
case situation: a full-scale input transition. The DAC’s 4 k
[10 k
Ω||8 kΩ = 4.4 kΩ] output impedance together with a
10 k
Ω feedback resistor produce an op amp noise gain of 3.25.
The current output from the DAC produces a 10 V step at the
op amp output (0 to –10 V Figure 25a, –10 V to 0 V Figure
25b.)
Therefore, with an ideal op amp, settling to
±1/2 LSB (±0.01%)
requires that 375
µV or less appears at the summing junction.
This means that the error between the input and output (that
voltage which appears at the AD712 summing junction) must be
less than 375
µV. As shown in Figure 25, the total settling time
for the AD712/AD565 combination is 1.2 microseconds.
+15V
0.1 F
0.1 F
1/2
AD712
10pF
OUTPUT
–10V TO +10V
AD565A
DAC
–15V
IOUT = 4
IREF
CODE
IREF
BIPOLAR
OFFSET ADJUST
IO
0.1 F
R1
100
R2
100
GAIN
ADJUST
REF
IN
REF
GND
20k
–VEE
0.1 F
POWER
GND
MSB
LSB
8k
5k
5k
10V
19.95k
0.5mA
DAC
OUT
10V
SPAN
20V
SPAN
VCC
REF
OUT
BIPOLAR
OFF
9.95k
+
Figure 24.
±10 V Voltage Output Bipolar DAC
Figure 25. Settling Characteristics for AD712 with AD565A
100
10
0%
500ns
90
0V
–10V
OUTPUT
5V
1mV
SUMMING
JUNCTION
a. (Full-Scale Negative Transition)
100
10
0%
500ns
90
0V
–10V
SUMMING
JUNCTION
OUTPUT
5V
1mV
b. (Full-Scale Positive Transition)


Số phần tương tự - AD712BH

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Analog Devices
AD712 AD-AD712 Datasheet
522Kb / 20P
   Dual Precision, Low Cost, High Speed BiFET Op Amp
Rev. G
AD7124-4 AD-AD7124-4 Datasheet
1Mb / 90P
   4-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference
AD7124-4-EP AD-AD7124-4-EP Datasheet
272Kb / 17P
   4-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference
Rev. 0
AD7124-4BCPZ AD-AD7124-4BCPZ Datasheet
1Mb / 90P
   4-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference
AD7124-4BCPZ-RL AD-AD7124-4BCPZ-RL Datasheet
1Mb / 90P
   4-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference
More results

Mô tả tương tự - AD712BH

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Analog Devices
AD712 AD-AD712_06 Datasheet
522Kb / 20P
   Dual Precision, Low Cost, High Speed BiFET Op Amp
Rev. G
AD712 AD-AD712_15 Datasheet
387Kb / 20P
   Precision, Low Cost, High Speed BiFET Dual Op Amp
Rev. H
AD711JRZ AD-AD711JRZ Datasheet
543Kb / 16P
   Precision, Low Cost, High Speed, BiFET Op Amp
REV. E
AD711 AD-AD711_15 Datasheet
717Kb / 16P
   Precision, Low Cost, High Speed, BiFET Op Amp
REV. E
AD711 AD-AD711 Datasheet
523Kb / 12P
   Precision, Low Cost, High Speed, BiFET Op Amp
REV. A
AD711SH AD-AD711SH Datasheet
543Kb / 16P
   Precision, Low Cost, High Speed, BiFET Op Amp
REV. E
AD711 AD-AD711_02 Datasheet
592Kb / 16P
   Precision, Low Cost, High Speed, BiFET Op Amp
REV. E
AD711JNZ AD-AD711JNZ Datasheet
717Kb / 16P
   Precision, Low Cost, High Speed, BiFET Op Amp
REV. E
AD642 AD-AD642 Datasheet
395Kb / 6P
   Precision, Low Cost Dual BiFET Op Amp
REV. 0
AD642 AD-AD642_15 Datasheet
399Kb / 6P
   Precision, Low Cost Dual BiFET Op Amp
REV. 0
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