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SP9841 датащи(PDF) 25 Page - Sipex Corporation

номер детали SP9841
подробное описание детали  8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC
PDF  32 Pages
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производитель  SIPEX [Sipex Corporation]
домашняя страница  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP9841 датащи(HTML) 25 Page - Sipex Corporation

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291
rail–to–rail output swing. In order to obtain this
performance, V
REFL must be externally driven to
V
DD/2, perhaps by use of the circuit of Figure 11.
At V
REFL near 2.5V and VDD = 4.75V, the typical
positive output headroom at the DAC is limited
to 1.15V above 2.5V, so that this circuit is useful
for rail–to–rail outputs for gains higher than
4.35 (i.e. 1.15V
PP maximum input). Note that
while an AC–coupled input is shown, this cir-
cuit is just as useful for DC–coupled inputs
which are generated with respect to the V
REFL
pseudoground voltage. R
IBIAS is used for the
AC–coupled circuit for opamp bias current re-
turn when the DAC is programmed to code 0, as
no current flows into V
IN(X) at code 0.
Figure 11 shows a minimal parts count method
Figure 11. Programmable, Bootstrapped, 1.4V to 2.2V V
REFL Drive.
The usable range for the bootstrapped V
REFL circuit is 1.4 to 2.4VOUT at VDD = 5V, RISRC = 2kOhms.
To increase the upper usable limit, decrease value of R
ISRC.
+
–
V
OUTA
1/8 of SP9841
3
ICL8069
At PRESET, V
OUT = 1.3V
(not well–regulated)
RISRC
2kOhm
Load code
45µF*
301Ohm
1.22V
+
–
V
REFL
V
INA
+
–
1/8 of SP9841
3
V
INB
*(Optional Noise Reduction)
+5V
112 for 1.4V
OUT = VREFL
96 for 1.6V
OUT = VREFL
70 for 2.2V
OUT = VREFL
V
OUTB
+
–
1/8 of SP9841
3
V
INH
V
OUTH



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