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PDF ZN425J Data sheet ( Hoja de datos )
| Número de pieza | ZN425J | |
| Descripción | 8-Bit D to A/A to D Converter | |
| Fabricantes | FERRANTI | |
| Logotipo |  |
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D.A/A-D CONVERTER
zN425E
2il425J
FEATURES
O Type
: Monolithic, containr D-A
with counter and reference
O Accuracy
: O.2YoFSR at 25'C (+* tSB
linearity)
o Operating Ranges
: O'C to 70'C (ZN425E)
-55'C to +125'C (ZN425J)
O Gompatibility
: TTL and CMOS
O Powor Supply
O Settling Time (D-A)
: Single *5V
: 1 pstyp.
O ConversionTime(A-D) : l mstyp., uring ramp ond
comparo
O Extra Gomponentr Required
D-A
: Reference capacitor (dircct
voltago output through
1Oko typ.)
A-D
: Comparator, gate, clock
rnd reference capacitor
16 LeadD.l.L.
DESCRIPTION
The ZN425E (or ZN425J) is a monolithic S.l.G. 8-bit digital to analogue convortor
containing an R-2Rladder network of diffused resistors with precision bipolar rwltchos,
and in addition a countor and a 2.5V precision voltag€ roference. The counter ir I
powerful addition which allows a precision staircase to be generated y6ry rimply
merely by clocking tho count€r.
vnEr
Output
cv
8itI
B i t7
8 i r6
B i r5
5elect
( H ' g hl o . C o u ^ l e r )
Clock
or I BrtBinarycounter or
F i g .1 - B l o c k D i a g r a m
1 page  
zN425ElZN425J
APPLICATIONS
l. g-bit D to A Convertel
The ZN425Egivesan analoguevoltageoutputdirectlyfrom pin 14 thereforethe usualcurrentto
voltage convertingamplifieris not required.The output voltage drift, due to the temperature
c o e f f i c i e n t ot hf e A n a l o g u e O u t p u t R e s i s t a n c e R "b, we liel ls s t h a n O ' 0 O 4 % p e r ' C ( o r 1 L . S . B . /
100'C) if Rs is chosenio be >650 kO.
In orderto removethe offsetvoltageand to calibratothe convertera bulfer amplifieris necessary.
Fig.4showsa typicalschemeusingthe internarleferencveoltageT. o minimisetemperaturderiftin
this and similarapplicationsthe sourceresistanceto the invertinginput of the operationaal mplifier
should be approximately6 ko. The calibrationprocedureis as follows:
(f
i. Setall bitsto OFF (low) and adjustR2 untilVout: 0'000V.
,i. Setall bitsto ON (high) and adjustR1 untilVou.: Nominalfull scalereading- 1 L.s.B,
rll. Repeati. and ii.
e.g.Set F.S.Rt.o + 3 .840 volts- 1 L.S.B.
: 3 .825 volts
i
(1L'S'8.: #:15'0
millivolts.)
B i rr
Bir2
Bit3
Bil4
( I 5 tJ,^ä"
lShrL
-5V
r 4 tc
Fig.4 - 8-bit oigital to AnalogueConvertel
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ZN425J.PDF ] | |
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