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AD8500 Datasheet(PDF) 18 Page - Analog Devices

Part # AD8500
Description  22 關A, RRIO, CMOS, 18 V
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8500 Datasheet(HTML) 18 Page - Analog Devices

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AD8546/AD8548
Data Sheet
Rev. B | Page 18 of 24
OUTPUT STAGE
The AD8546/AD8548 feature a complementary output stage
consisting of the M16 and M17 transistors (see Figure 61). These
transistors are configured in a Class AB topology and are biased
by the voltage source, VB2. This topology allows the output voltage
to go within millivolts of the supply rails, achieving a rail-to-rail
output swing. The output voltage is limited by the output imped-
ance of the transistors, which are low RON MOS devices. The output
voltage swing is a function of the load current and can be estimated
using the output voltage to supply rail vs. load current graphs (see
Figure 15, Figure 16, Figure 18, and Figure 19).
RAIL-TO-RAIL INPUT AND OUTPUT
The AD8546/AD8548 feature rail-to-rail input and output with a
supply voltage from 2.7 V to 18 V. Figure 62 shows the input and
output waveforms of the AD8546/AD8548 configured as a unity-
gain buffer with a supply voltage of ±9 V and a resistive load of
1 MΩ. With an input voltage of ±9 V, the AD8546/AD8548 allow
the output to swing very close to both rails. Additionally, the
AD8546/AD8548 do not exhibit phase reversal.
TIME (200µs/DIV)
VSY = ±9V
RL = 1MΩ
INPUT
OUTPUT
Figure 62. Rail-to-Rail Input and Output
RESISTIVE LOAD
The feedback resistor alters the load resistance that an amplifier
sees. Therefore, it is important to carefully select the value of the
feedback resistors used with the AD8546/AD8548. The amplifiers
are capable of driving resistive loads down to 100 kΩ. The Inverting
Op Amp Configuration section and the Noninverting Op Amp
Configuration section show how the feedback resistor changes
the actual load resistance seen at the output of the amplifier.
Inverting Op Amp Configuration
Figure 63 shows the AD8546/AD8548 in an inverting config-
uration with a resistive load, RL, at the output. The actual load
seen by the amplifier is the parallel combination of the feedback
resistor, R2, and the load, RL. For example, the combination of
a feedback resistor of 1 kΩ and a load of 1 MΩ results in an
equivalent load resistance of 999 Ω at the output. Because the
AD8546/AD8548 are incapable of driving such a heavy load,
performance degrades greatly.
To avoid loading the output, use a larger feedback resistor, but
consider the effect of resistor thermal noise on the overall circuit.
AD8546/
AD8548
R1
R2
RL
–VSY
RL, EFF = RL || R2
+VSY
VIN
VOUT
Figure 63. Inverting Op Amp Configuration
Noninverting Op Amp Configuration
Figure 64 shows the AD8546/AD8548 in a noninverting config-
uration with a resistive load, RL, at the output. The actual load seen
by the amplifier is the parallel combination of R1 + R2 and RL.
R1
R2
RL
–VSY
RL, EFF = RL || (R1 + R2)
+VSY
VIN
VOUT
AD8546/
AD8548
Figure 64. Noninverting Op Amp Configuration


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