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ICL7107CM44T Datasheet(PDF) 8 Page - Intersil Corporation |
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ICL7107CM44T Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 16 page 8 FN3082.8 Digital Section Figures 7 and 8 show the digital section for the ICL7106 and ICL7107, respectively. In the ICL7106, an internal digital ground is generated from a 6V Zener diode and a large P-Channel source follower. This supply is made stiff to absorb the relative large capacitive currents when the back plane (BP) voltage is switched. The BP frequency is the clock frequency divided by 800. For three readings/sec., this is a 60Hz square wave with a nominal amplitude of 5V. The segments are driven at the same frequency and amplitude and are in phase with BP when OFF, but out of phase when ON. In all cases negligible DC voltage exists across the segments. Figure 8 is the Digital Section of the ICL7107. It is identical to the ICL7106 except that the regulated supply and back plane drive have been eliminated and the segment drive has been increased from 2mA to 8mA, typical for instrument size common anode LED displays. Since the 1000 output (pin 19) must sink current from two LED segments, it has twice the drive capability or 16mA. In both devices, the polarity indication is “on” for negative analog inputs. If IN LO and IN HI are reversed, this indication can be reversed also, if desired. ICL7106 V+ BP TEST DECIMAL POINT SELECT CD4030 GND V+ TO LCD DECIMAL POINTS FIGURE 6. EXCLUSIVE ‘OR’ GATE FOR DECIMAL POINT DRIVE 7 SEGMENT DECODE SEGMENT OUTPUT 0.5mA 2mA INTERNAL DIGITAL GROUND TYPICAL SEGMENT OUTPUT V+ LCD PHASE DRIVER LATCH 7 SEGMENT DECODE ÷200 LOGIC CONTROL INTERNAL VTH = 1V 7 SEGMENT DECODE 1000’s 100’s 10’s 1’s TO SWITCH DRIVERS FROM COMPARATOR OUTPUT DIGITAL GROUND ÷4 CLOCK 40 39 38 OSC 1 OSC 2 OSC 3 BACKPLANE 21 V+ TEST V- 500 Ω 37 26 6.2V COUNTER COUNTER COUNTER COUNTER 1 c a b c d f g e a b a b c d f g e a b c d f g e † † THREE INVERTERS ONE INVERTER SHOWN FOR CLARITY FIGURE 7. ICL7106 DIGITAL SECTION ICL7106, ICL7107, ICL7107S |
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