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MC1408-8 Scheda tecnica(PDF) 5 Page - ON Semiconductor

Il numero della parte MC1408-8
Spiegazioni elettronici  8?뭕it Multiplying D/A Converter
Download  9 Pages
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Produttore elettronici  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC1408-8 Scheda tecnica(HTML) 5 Page - ON Semiconductor

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MC1408−8
http://onsemi.com
5
Circuit Description
The MC1408−8 consists of a reference current amplifier,
an R−2R ladder, and 8 high−speed current switches. For
many applications, only a reference resistor and reference
voltage need be added.
The switches are non−inverting in operation; therefore, a
high state on the input turns on the specified output current
component.
The switch uses current steering for high speed, and a
termination amplifier consisting of an active load gain stage
with unity gain feedback. The termination amplifier holds
the parasitic capacitance of the ladder at a constant voltage
during
switching,
and
provides
a
low
impedance
termination of equal voltage for all legs of the ladder.
The R−2R ladder divides the reference amplifier current
into binary−related components, which are fed to the
remainder current which is equal to the least significant bit.
This current is shunted to ground, and the maximum output
current is 255/256 of the reference amplifier current, or
1.992 mA for a 2.0 mA reference amplifier current if the
NPN current source pair is perfectly matched.
Functional Description
Reference Amplifier Drive and Compensation
The reference amplifier input current must always flow
into Pin 14. regardless of the setup method or reference
supply voltage polarity.
Connections for a positive reference voltage are shown in
Figure 3. The reference voltage source supplies the full
reference current. For bipolar reference signals, as in the
multiplying mode, R15 can be tied to a negative voltage
corresponding to the minimum input level. R15 may be
eliminated and Pin 15 grounded, with only a small sacrifice
in accuracy and temperature drift.
The compensation capacitor value must be increased with
increasing values of R14 to maintain proper phase margin.
For R14 values of 1.0, 2.5, and 5.0 k
W, minimum capacitor
values are 15, 37, and 75 pF. The capacitor may be tied to
either VEE or ground, but using VEE increases negative
supply rejection. (Fluctuations in the negative supply have
more effect on accuracy than do any changes in the positive
supply.)
A negative reference voltage may be used if R14 is
grounded and the reference voltage is applied to R15, as
shown in Figure 4. A high input impedance is the main
advantage of this method. The negative reference voltage
must be at least 3.0 V above the VEE supply. Bipolar input
signals may be handled by connecting R14 to a positive
reference voltage equal to the peak positive input level at
Pin 15.
Capacitive bypass to ground is recommended when a DC
reference voltage is used. The 5.0 V logic supply is not
recommended as a reference voltage, but if a well regulated
5.0 V supply which drives logic is to be used as the
reference, R14 should be formed of two series resistors and
the junction of the two resistors bypassed with 0.1
mF to
ground. For reference voltages greater than 5.0 V, a clamp
diode is recommended between Pin 14 and ground.
If Pin 14 is driven by a high impedance such as a transistor
current source, none of the above compensation methods
apply and the amplifier must be heavily compensated,
decreasing the overall bandwidth.
A1
A2
A3
A4
A5
A6
A7
A8
5
6
7
8
9
10
11
12
3
MC1408
13
14
15
1
2
4
16
SEE TEXT FOR VALUES OF C.
C
R14 = R15
(+)VREF
R14
R15
RL
IO
VEE
VCC
Figure 3. Positive VREF
A1
A2
A3
A4
A5
A6
A7
A8
5
6
7
8
9
10
11
12
3
MC1408
13
14
15
1
2
4
16
SEE TEXT FOR VALUES OF C.
C
R14 = R15
(−)VREF
R14
R15
RL
IO
VEE
VCC
Figure 4. Negative VREF


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