NTE2054 データシートの表示（PDF） - NTE Electronics
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NTE2054 Datasheet PDF : 3 Pages
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Circuit Description (Cont’d):
The timing for the NTE2054 is supplied by a 786Hz ring oscillator, and the input at Pin6 determines
the sampling rate. A 5V input provides a high–speed sampling rate (96Hz), and grounding or floating
Pin6 provides a low–speed (4Hz) sampling rate. When Pin6 is fixed at +1.2V (by placing a 12k resistor
between Pin6 and the +5V supply) a “hold” feature is available. While the NTE2054 is in the hold
mode, sampling continues at 4Hz but the display data are latched to the last reading prior to the ap-
plication of the 1.2V. Removal of the 1.2V restores continuous display changes. Note, however, that
the sampling rate remains at 4Hz.
The “EEE” or “–––” displays indicate that the range of the system has been exceeded in the positive
or negative direction, respectively. Negative voltages to –99mV are displayed with the minus sign in
the MSD. The BCD code is 1010 for a negative overrange (–––) and 1011 for a positive overrange
(EEE).
Pin Connection Diagram
BCD Output 21 1
BCD Output 20 2
Digit Select Output NSD 3
Digit Select Output MSD 4
Digit Select Output LSD 5
Hold/Bypass 6
GND 7
Zero Adjust 8
16 BCD Output 23
15 BCD Output 22
14 V (+)
13 Gain Adjust
12 Integrating Cap
11 High Input
10 Low Input
9 Zero Adjust
16
9
1
8
.870 (22.0) Max
.200 (5.08)
Max
.260 (6.6)
Max
.100 (2.54)
.700 (17.78)
.099 (2.5) Min
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