Electrical Specifications (Continued) (Note 1)
WS7106 / WS7107
PARAMETER
TEST CONDITIONS
MIN TYP MAX
UNIT
DISPLAY DRIVER WS7107 ONLY
Segment Sinking Current
(Except Pins 19 and 20)
V+ = 5V, Segment Voltage = 3V
5
8
-
mA
Pin 19 Only
10
16
-
mA
Pin 20 Only
4
7
-
mA
NOTES:
13. Dissipation rating assumes device is mounted with all leads soldered to printed circuit board.
2. Back plane drive is in phase with segment drive for 'off' segment, 180 degrees out of phase for 'on' segment. Frequency is 20
times conversion rate. Average DC component is less than 50mV
3. Not tested, Quaranteed by design.
Typical Applications and Test Circuits
+ - 9V
IN
R1
R5
R3
R4
C1
C4
C5 C2 R2
C3
DISPLAY
WS7106
DISPLAY
C1 = 0.1µF
C2 = 0.47µF
C3 = 0.22µF
C4 = 100pF
C5 = 0.02µF
R1 = 24kΩ
R2 = 47kΩ
R3 = 100kΩ
R4 = 1kΩ
R5 = 1MΩ
FIGURE 1. WS 7106 TEST CIRCUIT AND TYPICAL APPLICATION WITH LCD DISPLAY COMPONENTS SELECTED FOR 200mV
FULL SCALE
+5V
+-
-5V
IN
R1
R5
R3
R4
C1
C4
C5 C2 R2
C3
DISPLAY
WS7107
C1 = 0.1µF
C2 = 0.47µF
C3 = 0.22µF
C4 = 100pF
C5 = 0.02µF
R1 = 24kΩ
R2 = 47kΩ
R3 = 100kΩ
R4 = 1kΩ
R5 = 1MΩ
DISPLAY
FIGURE 2. WS 7107 TEST CIRCUIT AND TYPICAL APPLICATION WITH LED DISPLAY COMPONENTS SELECTED FOR 200mV
FULL SCALE
3