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AD644 Datasheet(PDF) 6 Page - Analog Devices

Part # AD644
Description  Dual High Speed, Implanted BiFET Op Amp
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD644 Datasheet(HTML) 6 Page - Analog Devices

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AD644
REV. A
–6–
Figure 27a illustrates the 10-bit digital-to-analog converter,
AD7533, connected for bipolar operation. Since the digital in-
put can accept bipolar numbers and VREF can accept a bipolar
analog input, the circuit can perform a 4-quadrant multiplying
function. The photos exhibit the response to a step input at
VREF. Figure 27b is the large signal response and Figure 27c is
the small signal response.
The output impedance of a CMOS DAC varies with the digital
word thus changing the noise gain of the amplifier circuit. The
effect will cause a nonlinearity the magnitude of which is depen-
dent on the offset voltage of the amplifier. The AD644K with
trimmed offset will minimize the effect. The Schottky protection
diodes recommended for use with many older CMOS DACs are
not required when using the AD644.
ACTIVE FILTERS
Literature on active filter techniques and characteristics based
on operational amplifiers is readily available. The successful ap-
plication of an active filter however, depends on the component
selection to achieve the desired performance. The AD644 is rec-
ommended for filters in medical, instrumentation, data acquisi-
tion and audio applications, because of its high gain bandwidth
figure, symmetrical slewing, low noise, and low 1 offset voltage.
The state variable filter (Figure 28) is stable, easily tuned and is
independent of circuit Q and gain. The use of the AD644 with
its low input bias current simplifies the resistor (R3, R4) selec-
tion for the passband center frequency, circuit Q and voltage
gain.
Figure 28. Band Pass State Variable Filter
The sample and hold circuit, shown in Figure 29 is suitable for
use with 8-bit A/D converters. The acquisition time using a
3900 pF capacitor and fast CMOS SPST (ADG200) switch is
15
µs.
The droop rate is very low 25
× 10–9 V/µs due to the low input
bias currents of the AD644. Care should be taken to minimize
leakage paths. Leakages around the hold capacitor will increase
the droop rate and degrade performance.
Figure 29. Sample and Hold Circuit
The AD644 in the circuit of Figure 30 provides highly accurate
signal conditioning with high frequency input signals. It pro-
vides an offset voltage drift of 10
µV/°C, CMRR of 80 dB over
the range of dc to 10 kHz and a bandwidth of 200 kHz (–3 dB)
at 1 V p-p output. The circuit of Figure 30 can be configured
for a gain range of 2 to 1000 with a typical nonlinearity of
0.01% at a gain of 10.
Figure 30. Wide Bandwidth Instrumentation Amplifier
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).


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