NTE2050 Datasheet, PDF (3/4 Pages) NTE Electronics – Integrated Circuit 31/2-Digit Single Chip A/D Converter

Electrical Characteristics (Cont’d): (T_A = +25°C, f_clock = 48kHz unless otherwise specified)
Parameter
Test Conditions
Min
Typ
Max
Unit
Analog Common Voltage Common 25kΩ Between Common 2.4
2.8
3.2
V
(With Respect to Positive Supply) & Positive Supply
Temperature Coefficient of Analog 25kΩ Between Common –
80
–
ppm/°C
Common (With Respect to
& Positive Supply
Positive Supply)
Peak–Peak Segment Drive Voltage, V+ to V– = 9V, Note 4
4
5
6
V
Peak–Peak Backplane Drive
Voltage (NTE2051 Only)
Segment Sinking Current
mA
(NTE2050 Only)
V+ = 5V
(Except Pin19)
Segment Voltage = 3V
5
8
–
(Pin19 Only)
10
16
–
Note 4. Back plane drive is in phase with segment drive for “off” segment, 180° outp of phase for “on”
segment. Frequency is 20 times conversion rate. Average DC component is less than
50mV.
Pin Connection Diagram
Units V(+) 1
Units D1 2
Units C1 3
Units B1 4
Units A1 5
Units F1 6
Units G1 7
Units E1 8
Tens D2 9
Tens C2 10
Tens B2 11
Tens A2 12
Tens F2 13
Tens E2 14
100’s D3 15
100’s B3 16
100’s F3 17
100’s E3 18
AB4 19
Polarity (–) 20
40 OSC 1
39 OSC 2
38 OSC 3
37 Test
36 Ref High
35 Ref Low
34 C (+) Ref
33 C (–)
32 Common
31 In High
30 In Low
29 A/Z
28 Buff
27 Int
26 V (–)
25 G2 Tens
24 C3 100’s
23 A3 100’s
22 G3 100’s
21 BP/GND*
Note: Pin21 is GND on the NTE2050