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AD694BR Datenblatt(PDF) 4 Page - Analog Devices

Teilenummer AD694BR
Bauteilbeschribung  4??0 mA Transmitter
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AD694
–4–
REV. B
Typical Minimum Supply Voltage vs. Temperature for 2 V
and 10 V Full Scale
Maximum RL vs. Supply Voltage
Voltage Reference Power Supply Rejection
IOUT: Voltage Compliance vs. Temperature
FUNCTIONAL DESCRIPTION
The operation of the AD694 can best be understood by dividing
the circuit into three functional parts (see Figure 1). First, a
single supply input amplifier buffers the high level, single-ended
input signal. The buffer amplifier drives the second section, a
voltage to current (V/I) converter, that makes a 0 to 16 mA sig-
nal dependent current.
Figure 1. Functional Block Diagram
The third section, a voltage reference and offset generator, is re-
sponsible for providing the 4 mA offset current signal.
BUFFER AMPLIFIER
The buffer amplifier is a single supply amplifier that may be
used as a unity gain buffer, an output amplifier for a current
output DAC, or as a gain block to amplify low level signals. The
amplifier’s PNP input stage has a common-mode range that ex-
tends from a few hundred mV below ground to within 2.5 V of
VS. The Class A output of the amplifier appears at Pin 1 (FB).
The output range extends from about 1 mV above common to
within 2.5 V of VS when the amplifier is operated as a follower.
The amplifier can source a maximum load of 5 k
Ω, but can sink
only as much as its internal 10 k
Ω pulldown resistor allows.
V/I CONVERTER
The ground referenced, input signal from the buffer amplifier is
converted to a 0 to 0.8 mA current by A2 and level shifted to
the positive supply. A current mirror then multiplies this signal
by a factor of 20 to make the signal current of 0 to 16 mA. This
technique allows the output stage to drive a load to within 2 V
of the positive supply (VS). Amplifier A2 forces the voltage at
Pin 1 across resistors R1 and R2 by driving the Darlington tran-
sistor, Q2. The high gain Darlington transmits the resistor cur-
rent to its collector and to R3 (900
Ω). A3 forces the level
shifted signal across the 45
Ω resistor to get a current gain of 20.
The transfer function of the V/I stage is therefore:
IV
R1
R2
OUT
PIN1
+
()
20
/
resulting in a 0-16 mA output swing for a 0–10 V input. Tying
Pin 4 (2 V FS) to ground shorts out R2 and results in a 2 V
full-scale input for a 16 mA output span.
The output stage of the V/I converter is of a unique design that
allows the IOUT pin to drive a load below the common (sub-
strate) potential of the device. The output transistor can always
drive a load to a point 36 V below the positive supply (VS). An


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