|
|
Discount Sale for DC160211A2
|
Only 16 left
Item Number: DC160211A2
|
Discounted Promotion Items.
( Limited Quantity)
|
The item in this category has the special price that discounts 20-50% from our standard price.
This discount deal is available for a limited quantity only. If you would like to use the item for future production/applications, please consult nearest Noritake Sales for pricing and availability. Ordered items are Non-Cancellable and Non-Returnable (NC/NR).
|
|
The DC160211A2 is a high brightness dot character vacuum fluorescent display (VFD) tube.
300fL (1028cd/m^2) along with an 11mm character height allow for great visibility of this displays output.
The inclusion of decimal and thousands indicators makes this display ideal for point of sale (POS) applications.
The operation temperature is specified from -40 to 85 degrees Celsius.
This VFD uses a Dual-In-Line Package (DIP) with 2.54mm (0.1") pitch.
Separate filament and grid/anode voltages are required as inputs to power and control the display output.
|
This item is Non-RoHS product.
| This product contains VFD Tube and its data sheet only. Please prepare the filament and grid/anode voltages as required inputs to power and control the display output.
|
Electrical Characteristics: ( Ta = 25 degree in Celsius )
Characteristics
|
Symbol
|
Conditions
|
Min.
|
Typ.
|
Max.
|
Unit
|
Filament Voltage
|
Ef
|
-
|
7.5
|
8.3
|
9.1
|
Vac *1
|
Grid Voltage
|
ec
|
-
|
-
|
35.0
|
43.0
|
Vp-p *2
|
Anode Voltage
|
eb
|
-
|
-
|
35.0
|
43.0
|
Vp-p *2
|
Filament current
|
If
|
Ef = 8.3 Vac
ec=eb= 0V
|
192.0
|
212.0
|
240.0
|
mAac
|
Grid current
|
ic
|
Ef= 8.3 Vac
ec= 35.0 Vp-p
eb= 35.0 Vp-p
Duty= 1/20
|
-
|
25.0
|
50.0
|
mAp-p
|
Anode current per Character
|
ib
|
-
|
30.0
|
60.0
|
mAp-p
|
Luminance
|
L
|
100
|
300
|
-
|
ft-L
|
Grid cut-off
Voltage *3
|
Ecco
|
Ef= 8.3 Vac
Eb= 35.0 Vdc
|
-10.0
|
-
|
-
|
Vdc
|
Anode cut-off
Voltage *3
|
Ebco
|
Ef= 8.3 Vac
ec= 35.0 Vp-p
|
-6.0
|
-
|
-
|
Vdc
|
Note:
Unless otherwise specified. the grid and anode current shall be per digit or character at all anodes lit up.
*1: Effective value (root-mean-square) at 60 Hz.
*2: Pulse conditions;
Duty cycle = 1/20
Pulse width = 100 µsec.
*3: With respect to the filament transformer Current-Tap (FCT) level.
What is VFD Operating Principles and Structure?
The VFD is a kind of triode vacuum tube with three electrodes which are:
- Cathode Filament(s)
- Control Grids
- Illumination Anodes
|
|
How it works?
The electrons emitted from the cathode filaments are controlled by the grids. When the grid is supplied with a positive voltage, it attracts the negative electrons, diffuses them and, due to their acceleration, many flow through the grid mesh towards the anode (opposite charges attract). However, when the grid is supplied with a negative voltage, it repels the negative electrons and prevents them from reaching the anode (similar charges repel).
The illuminating anodes are coated with phosphor which emits light when hit by the electrons. Each anode forms a segment or dot, which collectively form individual characters. When an anode is supplied with a positive voltage, it will attract the electrons which have been accelerated through the grid. The segment emits light when these electrons impact on the phosphor coating. Alternatively when anodes are supplied with a negative voltage, they will repel electrons from their phosphor coating and therefore remain un-illuminated.
By selecting combinations of illuminated segments, the desired digit or character can be formed.
VFD Multiplex Drive (Dynamic Drive)
| To minimize the number of pin connections and driver chips, the majority of VFD's use the multiplexing drive method. As shown in Fig.6, corresponding anode segments are connected in common under each separate grid, with each in turn being connected to a data line. Each character has its own separate grid which not only diffuses the electrons from the filaments, but also controls the selection of the character position in a "time share" multiplexing cycle. The duty cycle 'on time' of each character will determine the appropriate operating voltage required to provide sufficient luminance. Fig.7 shows the basic driving circuit.
|
Fig.6 Multiplex Drive VFD
Fig.7 Driving Circuit of Multiplex Drive VFD
|
|
|
The timing T1 in Fig.8 shows that when Grid 1 (G1) is ON and data lines Pb and Pc are ON under Grid 1, with all the other grids OFF, the numeric character '1' will be displayed. After the time period T1, Grid 1 is turned OFF and the voltages on the anode data lines are reconfigured to suit the requirements of Grid 2. Grid 2 is then turned ON. In the example, this will be the numeric character '2'. The scanning of Grid 1 to Grid n should be repeated at more than 100 times per second so that persistence of vision in the human eyes gives a stationary, solid display without any flicker. The number of grids and anodes is optimized to reduce the number of lead pins to a minimum. Other factors may be important so the multiplexing drive can be a duplex drive, where the display is separated under two grids, taking advantage of requiring fewer drive chips than static mode and a lower drive voltage than that required by an ordinary multiplexing mode.
|
Fig.8 Example Timing Chart of Multiplex Drive VFD
|
Please consult nearest Noritake sales office for further information, or visit our website Noritake VFD Technology Page.
|
Product Reviews
|
|
|