NE5037 Ver la hoja de datos (PDF) - Philips Electronics
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NE5037 Datasheet PDF : 8 Pages
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Philips Semiconductors Linear Products
6-Bit A/D converter (parallel outputs)
Product specification
NE5037
TRANSFER CHARACTERISTICS
The ideal transfer characteristic of the NE5037 is shown in Figure 2.
The NE5037 is designed to have a nominal LSB offset so that the
code transition points are located LSB on either side of the exact
analog inputs for a given code.
Thus the first transition (000000 to 000001) will occur at an input of
LSB (15.63mV with a VREF of 2.0V). Subsequent transitions will
occur at nominal increments of 1 LSB. The last transition (to
full-scale—111111) will occur at 62.5 LSB (1.953V at VREF of 2.0V).
LAYOUT PRECAUTIONS
Analog ground (Pin 4) and digital ground (Pin 5) are not connected
internally and should be connected together as close to the device
as possible for optimum performance. The circuit will operate with as
much as ±200mV between the two grounds but some degradation
will occur. The leads to the analog inputs should be kept as short as
possible to minimize noise pick-up. Input bypass capacitors from the
analog inputs to ground will eliminate noise pick-up. Power supplies
should be decoupled with at least 1µF located close to the device to
minimize the effects of noise spikes.
The reference input and the analog voltage input must both remain
stable during conversion to insure accuracy and proper operation.
This can be done by adequately bypassing these inputs and/or
keeping the impedance of these inputs at or below 2kΩ.
111111
111110
111101
111100
000011
000010
000001
000000
LSB
+
VREF
64
FOR 111111 OUTPUT
VIN = VREF — LSB — 1/2 LSB
BUILT–IN OFFSET
+ 62.5LSB
+
62.5
64
VREF
ANALOG INPUT
Figure 2. Ideal Transfer Characteristics
August 31, 1994
585
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