EL5225 [INTERSIL]

10-Channel TFT-LCD Reference Voltage Generator; 10通道TFT -LCD参考电压发生器
EL5225
型号: EL5225
厂家: Intersil    Intersil
描述:

10-Channel TFT-LCD Reference Voltage Generator
10通道TFT -LCD参考电压发生器

电压发生器 CD
文件: 总12页 (文件大小:859K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
EL5225  
®
Data Sheet  
March 11, 2004  
FN7356.0  
10-Channel TFT-LCD Reference Voltage  
Generator  
Features  
• 10-channel reference outputs  
• Accuracy of ±1%  
The EL5225 is designed to produce the reference voltages  
required in TFT-LCD applications. Each output is  
programmed to the required voltage with 10 bits of  
resolution. Reference pins determine the high and low  
voltages of the output range, which are capable of swinging  
to either supply rail. Programming of each output is  
performed using the 3-wire, SPI compatible interface.  
• Supply voltage of 5V to 16.5V  
• Digital supply 3.3V to 5V  
• Low supply current of 9mA  
• Rail-to-rail capability  
A number of the EL5225 can be stacked for applications  
requiring more than 10 outputs. The reference inputs can be  
tied to the rails, enabling each part to output the full voltage  
range, or alternatively, they can be connected to external  
resistors to split the output range and enable finer  
resolutions of the outputs.  
• Pb-free available (RoHS compliant)  
Applications  
• TFT-LCD drive circuits  
• Reference voltage generators  
The EL5225 has 10 outputs, and is available in the 24-pin  
TSSOP package. They are specified for operation over the  
full -40°C to +85°C temperature range.  
Pinout  
EL5225  
(24-PIN TSSOP)  
TOP VIEW  
Ordering Information  
1
2
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
ENA  
SDI  
OUTA  
PART  
NUMBER  
(See Note)  
PACKAGE  
(Pb-Free)  
TAPE &  
REEL  
OUTB  
OUTC  
GND  
PKG. DWG. #  
MDP0044  
MDP0044  
MDP0044  
3
SCLK  
SDO  
EL5225IRZ  
24-Pin TSSOP  
24-Pin TSSOP  
-
EL5225IRZ-T7  
7”  
4
EL5225IRZ-T13 24-Pin TSSOP  
13”  
5
EXT_OSC  
VS+  
OUTD  
OUTE  
OUTF  
OUTG  
GND  
NOTE: Intersil Pb-free products employ special Pb-free material  
sets; molding compounds/die attach materials and 100% matte tin  
plate termination finish, which are RoHS compliant and compatible  
with both SnPb and Pb-free soldering operations. Intersil Pb-free  
products are MSL classified at Pb-free peak reflow temperatures that  
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020C.  
6
7
VSD  
8
REFH  
REFL  
VS+  
9
10  
OUTH  
OUTI  
GND 11  
CAP 12  
OUTJ  
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.  
1
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.  
Copyright © Intersil Americas Inc. 2002-2004. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.  
All other trademarks mentioned are the property of their respective owners.  
EL5225  
Absolute Maximum Ratings (T = 25°C)  
A
Supply Voltage between V & GND. . . . . . . . 4.5V (min) to 18V (max)  
Maximum Die Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . +125°C  
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C  
Ambient Operating Temperature . . . . . . . . . . . . . . . .-40°C to +85°C  
S
Supply Voltage between V & GND . . 3V (min) to V and 7V (max)  
SD  
S
Maximum Continuous Output Current . . . . . . . . . . . . . . . . . . . 30mA  
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves  
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the  
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.  
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are  
at the specified temperature and are pulsed tests, therefore: T = T = T  
J
C
A
Electrical Specifications  
V
= 15V, V = 5V, V  
SD  
= 13V, V  
= 2V, R = 1.5kand C = 200pF to 0V, T = 25°C, unless  
S
REFH  
REFL  
L
L
A
otherwise specified.  
PARAMETER  
SUPPLY  
DESCRIPTION  
CONDITIONS  
MIN  
TYP  
MAX  
UNIT  
I
I
Supply Current  
No load  
9
11.5  
0.35  
mA  
mA  
S
Digital Supply Current  
0.17  
SD  
ANALOG  
V
V
Output Swing Low  
Sinking 5mA (V  
= 15V, V  
= 0)  
50  
14.95  
140  
65  
150  
mV  
V
OL  
REFH  
REFL  
= 15V, V = 0)  
REFL  
Output Swing High  
Sourcing 5mA (V  
14.85  
100  
45  
OH  
REFH  
I
Short Circuit Current  
R
= 10Ω  
L
mA  
SC  
PSRR  
Power Supply Rejection Ratio  
Program to Out Delay  
Accuracy referred to the ideal value  
Channel to Channel Mismatch  
Droop Voltage  
V + is moved from 14V to 16V  
S
dB  
t
4
ms  
D
V
Code = 512  
Code = 512  
20  
mV  
AC  
V  
2
mV  
MIS  
V
1
2
mV/ms  
kΩ  
DROOP  
R
Input Resistance @ V  
Load Regulation  
Band Gap  
, V  
REFH REFL  
32  
INH  
REG  
I
= 5mA step  
0.5  
1.3  
1.5  
1.6  
mV/mA  
V
OUT  
CAP  
Bypass with 0.1µF  
1
DIGITAL  
V
Logic 1 Input Voltage  
V
V
= 5V  
4
2
V
V
IH  
SD  
= 3.3V  
SD  
F
Clock Frequency  
Logic 0 Input Voltage  
Setup Time  
5
1
MHz  
V
CLK  
V
V
= 3.3V/5V  
IL  
SD  
t
t
t
t
t
20  
20  
20  
20  
10  
1
ns  
ns  
ns  
ns  
ns  
GΩ  
µs  
S
Hold Time  
H
Load to Clock Time  
Clock to Load Line  
LC  
CE  
DCO  
Clock to Out Delay Time  
S Input Resistance  
DIN  
Negative edge of SCLK  
R
SDIN  
T
Minimum Pulse Width for EXT_OSC  
Signal  
5
PULSE  
Duty Cycle  
INL  
Duty Cycle for EXT_OSC Signal  
Integral Nonlinearity Error  
50  
1.3  
0.5  
21  
%
LSB  
LSB  
kHz  
DNL  
Differential Nonlinearity Error  
Internal Refresh Oscillator Frequency  
F_OSC  
OSC_Select = 0  
FN7356.0  
March 11, 2004  
2
EL5225  
Pin Descriptions  
PIN NUMBER  
PIN NAME  
PIN TYPE  
Logic Input  
PIN FUNCTION  
1
ENA  
SDI  
Chip select, low enables data input to logic  
Serial data input  
2
3
Logic Input  
SCLK  
SDO  
Logic Input  
Serial data clock  
4
Logic Output  
Logic Input/Output  
Analog Power  
Serial data output  
5
EXT_OSC  
VS+  
External oscillator input or internal oscillator output  
Positive supply voltage for analog circuits  
Not connected  
6, 10  
NC  
7
VSD  
Digital Power  
Analog Reference Input  
Analog Reference Input  
Ground  
Positive power supply for digital circuits (3.3V - 5V)  
High reference voltage  
8
REFH  
REFL  
GND  
9
Low reference voltage  
11  
12  
13  
14  
15  
17  
18  
19  
20  
22  
23  
24  
Ground  
CAP  
Analog Bypass Pin  
Analog Output  
Analog Output  
Analog Output  
Analog Output  
Analog Output  
Analog Output  
Analog Output  
Analog Output  
Analog Output  
Analog Output  
Analog Output  
Analog Output  
Power  
Decoupling capacitor for internal reference generator, 0.1µF  
Channel J programmable output voltage  
Channel I programmable output voltage  
Channel H programmable output voltage  
Channel G programmable output voltage  
Channel F programmable output voltage  
Channel E programmable output voltage  
Channel D programmable output voltage  
Channel C programmable output voltage  
Channel B programmable output voltage  
Channel A programmable output voltage  
Channel L programmable output voltage  
Channel K programmable output voltage  
Ground  
OUTJ  
OUTI  
OUTH  
OUTG  
OUTF  
OUTE  
OUTD  
OUTC  
OUTB  
OUTA  
OUTL  
OUTK  
GND  
16, 21  
FN7356.0  
March 11, 2004  
3
EL5225  
Typical Performance Curves  
0.3  
0.2  
0.1  
1.5  
1
REF =13V  
H
REF =2V  
L
0.5  
0
0
-0.1  
-0.2  
-0.3  
V =15V  
S
V
V
V
=5V  
-0.5  
-1  
SD  
=13V  
=2V  
REFH  
REFL  
10  
210  
410  
610  
810  
1010  
0
200  
400  
600  
800  
1000  
1200  
INPUT CODE  
CODE  
FIGURE 1. DIFFERENTIAL NONLINEARITY vs CODE  
FIGURE 2. INTEGRAL NONLINEARITY ERROR  
0mA  
5mA  
5mA/DIV  
5mA  
0mA  
C =1nF  
L
R =20  
S
C =4.7nF  
L
S
C =4.7nF  
L
R =20Ω  
R =20Ω  
S
5V  
200mV/DIV  
200mV/DIV  
C =1nF  
L
C =180pF  
L
R =20Ω  
S
C =180pF  
L
V =V  
=15V  
V =V =15V  
REFH  
S
REFH  
S
M=400ns/DIV  
M=400ns/DIV  
FIGURE 3. TRANSIENT LOAD REGULATION (SOURCING)  
FIGURE 4. TRANSIENT LOAD REGULATION (SINKING)  
SCLK  
SCLK  
5V  
5V  
0V  
0V  
SDA  
SDA  
5V  
5V  
0V  
10V  
5V  
0V  
OUTPUT  
10V  
5V  
OUTPUT  
0V  
0V  
M=400µs/DIV  
M=400µs/DIV  
FIGURE 5. LARGE SIGNAL RESPONSE (RISING FROM 0V  
TO 8V)  
FIGURE 6. LARGE SIGNAL RESPONSE (FALLING FROM 8V  
TO 0V)  
FN7356.0  
March 11, 2004  
4
EL5225  
Typical Performance Curves (Continued)  
SCLK  
SCLK  
SDA  
5V  
5V  
0V  
0V  
SDA  
5V  
0V  
5V  
0V  
200mV  
200mV  
OUTPUT  
OUTPUT  
0V  
0V  
M=400µs/DIV  
M=400µs/DIV  
FIGURE 7. SMALL SIGNAL RESPONSE (RISING FROM 0V  
TO 200mV)  
FIGURE 8. SMALL SIGNAL RESPONSE (FALLING FROM  
200mV TO 0V)  
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL  
JEDEC JESD51-3 LOW EFFECTIVE THERMAL  
CONDUCTIVITY TEST BOARD  
CONDUCTIVITY TEST BOARD  
1.4  
0.9  
781mW  
0.8  
1.176W  
1.2  
0.7  
0.6  
0.5  
0.4  
0.3  
0.2  
0.1  
0
1
0.8  
0.6  
0.4  
0.2  
0
0
25  
50  
75 85 100  
125  
0
25  
50  
75 85 100  
125  
AMBIENT TEMPERATURE (°C)  
AMBIENT TEMPERATURE (°C)  
FIGURE 9. POWER DISSIPATION vs AMBIENT  
TEMPERATURE  
FIGURE 10. POWER DISSIPATION vs AMBIENT  
TEMPERATURE  
General Description  
The EL5225 provides a versatile method of providing the  
reference voltages that are used in setting the transfer  
characteristics of LCD display panels. The V/T  
Digital Interface  
The EL5225 uses a simple 3-wire SPI compliant digital  
interface to program the outputs. The EL5225 can support  
the clock rate up to 5MHz.  
(Voltage/Transmission) curve of the LCD panel requires that  
a correction is applied to make it linear; however, if the panel  
is to be used in more than one application, the final curve  
may differ for different applications. By using the EL5225,  
the V/T curve can be changed to optimize its characteristics  
according to the required application of the display product.  
Each of the eight reference voltage outputs can be set with a  
10-bit resolution. These outputs can be driven to within  
50mV of the power rails of the EL5225. As all of the output  
buffers are identical, it is also possible to use the EL5225 for  
applications other than LCDs where multiple voltage  
references are required that can be set to 10 bit accuracy.  
Serial Interface  
The EL5225 is programmed through a three-wire serial  
interface. The start and stop conditions are defined by the  
ENA signal. While the ENA is low, the data on the SDI (serial  
data input) pin is shifted into the 16-bit shift register on the  
positive edge of the SCLK (serial clock) signal. The MSB (bit  
15) is loaded first and the LSB (bit 0) is loaded last (see  
Table 1). After the full 16-bit data has been loaded, the ENA  
is pulled high and the addressed output channel is updated.  
The SCLK is disabled internally when the ENA is high. The  
SCLK must be low before the ENA is pulled low.  
FN7356.0  
March 11, 2004  
5
EL5225  
To facilitate the system designs that use multiple EL5225  
chips, a buffered serial output of the shift register (SDO pin)  
is available. Data appears on the SDO pin at the 16th falling  
SCLK edge after being applied to the SDI pin.  
TABLE 1. CONTROL BITS LOGIC TABLE  
BIT  
B15  
B14  
B13  
B12  
B11  
B10  
B9  
NAME  
Test  
Oscillator  
A3  
DESCRIPTION  
Always 0  
To control the multiple EL5225 chips from a single three-wire  
serial port, just connect the ENA pins and the SCLK pins  
together, connect the SDO pin to the SDI pin on the next  
chip. While the ENA is held low, the 16m-bit data is loaded to  
the SDI input of the first chip. The first 16-bit data will go to  
the last chip and the last 16-bit data will go to the first chip.  
While the ENA is held high, all addressed outputs will be  
updated simultaneously.  
0 = Internal, 1 = External  
Channel Address  
A2  
Channel Address  
A1  
Channel Address  
A0  
Channel Address  
Data  
D9  
The Serial Timing Diagram and parameters table show the  
timing requirements for three-wire signals.  
B8  
D8  
Data  
B7  
D7  
Data  
The serial data has a minimum length of 16 bits, the MSB  
(most significant bit) is the first bit in the signal. The bits are  
allocated to the following functions (also refer to the Control  
Bits Logic Table)  
B6  
D6  
Data  
B5  
D5  
Data  
B4  
D4  
Data  
• Bit 15 is always set to a zero  
B3  
D3  
Data  
• Bit 14 controls the source of the clock, see the next  
section for details  
B2  
D2  
Data  
• Bits 13 through 10 select the channel to be written to,  
these are binary coded with channel A = 0, and channel  
H = 7  
B1  
D1  
Data  
B0  
D0  
Data  
• The 10-bit data is on bits 9 through 0. Some examples of  
data words are shown in the table of Serial Programming  
Examples  
Serial Timing Diagram  
ENA  
t
t
T
t
t
t
t
SE  
HE  
SE  
r
f
HE  
SCLK  
t
t
HD  
t
SD  
w
SDI  
B15  
B14  
B13  
B12-B2  
B1  
B0  
t
MSB  
Load MSB first, LSB last  
LSB  
FN7356.0  
March 11, 2004  
6
EL5225  
TABLE 2. SERIAL TIMING PARAMETERS  
PARAMETER  
RECOMMENDED OPERATING RANGE  
DESCRIPTION  
T
200ns  
0.05 * T  
10ns  
Clock Period  
t /t  
r f  
Clock Rise/Fall Time  
ENA Hold Time  
t
HE  
t
10ns  
ENA Setup Time  
Data Hold Time  
SE  
t
10ns  
HD  
t
10ns  
Data Setup Time  
Clock Pulse Width  
SD  
t
0.50 * T  
W
TABLE 3. SERIAL PROGRAMMING EXAMPLES  
DATA  
CONTROL CHANNEL ADDRESS  
C1  
0
C0  
0
A3 A2 A1  
A0 D9 D8 D7 D6 D5 D4 D3 D2 D1  
D0  
CONDITION  
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
1
1
1
0
0
0
1
1
1
0
1
1
1
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
1
0
0
1
1
0
1
0
0
1
1
0
1
0
0
1
1
0
1
0
0
1
1
0
1
0
Internal Oscillator, Channel A, Value = 0  
Internal Oscillator, Channel A, Value = 1023  
Internal Oscillator, Channel A, Value = 512  
0
0
0
0
0
0
1‘t Internal Oscillator, Channel C, Value = 513  
0
0
1
1
Internal Oscillator, Channel H, Value = 31  
External Oscillator, Channel H, Value = 31  
0
1
CLOCK OSCILLATOR  
Analog Section  
The EL5225 requires an internal clock or external clock to  
refresh its outputs. The outputs are refreshed at the falling OSC  
clock edges. The output refreshed switches open at the rising  
edges of the OSC clock. The driving load shouldn’t be changed  
at the rising edges of the OSC clock. Otherwise, it will generate  
a voltage error at the outputs. This clock may be input or output  
via the clock pin labeled OSC. The internal clock is provided by  
an internal oscillator running at approximately 21kHz and can  
be output to the OSC pin. In a 2 chip system, if the driving loads  
are stable, one chip may be programmed to use the internal  
oscillator; then the OSC pin will output the clock from the  
internal oscillator. The second chip may have the OSC pin  
connected to this clock source.  
TRANSFER FUNCTION  
The transfer function is:  
data  
1024  
------------  
V
= V  
+
× (V  
- V  
)
REFL  
OUT(IDEAL)  
REFL  
REFH  
where data is the decimal value of the 10-bit data binary  
input code.  
The output voltages from the EL5225 will be derived from  
the reference voltages present at the V  
pins. The impedance between those two pins is about 32k.  
and V  
REFL  
REFH  
Care should be taken that the system design holds these two  
reference voltages within the limits of the power rails of the  
For transient load application, the external clock Mode  
should be used to ensure all functions are synchronized  
together. The positive edge of the external clock to the OSC  
pin should be timed to avoid the transient load effect. The  
Application Drawing shows the LCD H rate signal used, here  
the positive clock edge is timed to avoid the transient load of  
the column driver circuits.  
EL5225. GND < V  
REFH  
V and GND V  
REFL  
V .  
REFH  
S
In some LCD applications that require more than 10  
channels, the system can be designed such that one  
EL5225 will provide the Gamma correction voltages that are  
more positive than the V potential. The second EL5225  
COM  
can provide the Gamma correction voltage more negative  
than the V potential. The Application Drawing shows a  
COM  
system connected in this way.  
After power on, the chip will start with the internal oscillator  
mode. At this time, the OSC pin will be in a high impedance  
condition to prevent contention. By setting B14 to high, the  
chip is on external clock mode. Setting B14 to low, the chip is  
on internal clock mode.  
FN7356.0  
March 11, 2004  
7
EL5225  
Block Diagram  
REFERENCE HIGH  
OUTA  
OUTB  
OUTH  
OUTI  
EIGHT  
CHANNEL  
MEMORY  
VOLTAGE  
SOURCES  
OUTJ  
REFERENCE LOW  
REFERENCE DECOUPLE  
CLK  
SDI  
SDO  
CONTROL IF  
LOAD  
FILTER  
EXT_OSC  
CHANNEL OUTPUTS  
and 4.2ms depending on the absolute timing relative to the  
update cycle.  
Each of the channel outputs has a rail-to-rail buffer. This  
enables all channels to have the capability to drive to within  
50mV of the power rails, (see Electrical Characteristics for  
details).  
Output Stage and the Use of External Oscillator  
Simplified output sample and hold amp stage for one  
channel.  
When driving large capacitive loads, a series resistor should  
be placed in series with the output. (Usually between 5and  
50).  
CH  
S
1
1.3V  
+
-
+
-
V
OUT  
1.3V  
Each of the channels is updated on a continuous cycle, the  
time for the new data to appear at a specific output will  
depend on the exact timing relationship of the incoming data  
to this cycle.  
S
2
V
+
-
IN  
OSC  
The best-case scenario is when the data has just been  
captured and then passed on to the output stage  
immediately; this can be as short as 48µs. In the worst-case  
scenario, this will be 480µs when the data has just missed  
the cycle.  
FIGURE 11.  
The output voltage is generated from the DAC, which is V  
at the above circuit. The refreshed switches are controlled  
IN  
by the internal or external oscillator signal. When the OSC  
When a large change in output voltage is required, the  
change will occur in 2V steps, thus the requisite number of  
timing cycles will be added to the overall update time. This  
means that a large change of 16V can take between 3.8ms  
clock signal is low, the switch S and S are closed. The  
1
2
output V  
= V and at the same time the sample and  
OUT  
IN  
hold cap CH is being charged. When the OSC clock signal is  
high, the refreshed switch S and S are opened and the  
1
2
output voltage is maintained by CH. This refreshed process  
FN7356.0  
March 11, 2004  
8
EL5225  
will repeat every 10-clock cycles for each channel. The time  
takes to update the output depends on the timing at the V  
IN  
and the state of the switches. It can take 1 to 10 clock cycles  
to update each output.  
V
OUT1  
For the sample and hold capacitor CH to maintain the  
correct output voltage, the driving load shouldn’t be changed  
at the rising edge of the OSC signal. Since at the rising edge  
of the OSC clock, the refreshed switches are being opened,  
if the load changes at that time, it will generate an error  
output voltage. For a fixed load condition, the internal  
oscillator can be used.  
OSC  
V
OUT2  
M=400µs/DIV  
For the transient load condition, the external OSC mode  
should be used to avoid the conflict between the rising edge  
of the OSC signal and the changing load. So a timing delay  
circuit will be needed to delay the OSC signal and avoid the  
rising edge of the OSC signal and changing the load at the  
same time.  
FIGURE 13. CHANNEL-TO-CHANNEL REFRESH  
Ch1 - Output1  
Ch3 - Output2  
Ch2 - EXT_OSC  
At the falling edge of the OSC, output 1 is refreshing and one  
clock cycle later, output2 is being refreshed. The spike you  
see here is the response of the output amplifier when the  
refreshed switches are closed. When driving a big capacitor  
load, there will be ringing at the spikes because the phase  
margin of the amplifier is decreased.  
I
OUT  
V
OUT  
The speed of the external OSC signal shouldn’t be greater  
than 70kHz because for the worst condition, it will take at  
least 4µs to charge the sample and hold Capacitor CH. The  
pulse width has to be at least 4µs long. From our lab test, the  
duty cycle of the OSC signal must be greater than 30%.  
OSC  
M=400µs/DIV  
POWER DISSIPATION  
FIGURE 12. TRANSIENT LOAD RESPONSE  
With the 30mA maximum continues output drive capability  
for each channel, it is possible to exceed the 125°C absolute  
maximum junction temperature. Therefore, it is important to  
calculate the maximum junction temperature for the  
application to determine if load conditions need to be  
modified for the part to remain in the safe operation.  
Channel 3 - sinking and sourcing 5mA current  
Channel 2 - EXT_OSC signal  
Channel 1 - V  
OUT  
Here, the OSC signal is synchronized to the load signal. The  
rising edge of the OSC signal is then delayed by some  
amount of time and gives enough time for CH to be charged  
to a new voltage before the switches are opened.  
The maximum power dissipation allowed in a package is  
determined according to:  
T
- T  
AMAX  
JMAX  
--------------------------------------------  
P
=
DMAX  
Θ
JA  
where:  
• T  
• T  
= Maximum junction temperature  
= Maximum ambient temperature  
JMAX  
AMAX  
θ = Thermal resistance of the package  
JA  
• P  
DMAX  
= Maximum power dissipation in the package  
FN7356.0  
March 11, 2004  
9
EL5225  
The maximum power dissipation actually produced by the IC  
is the total quiescent supply current times the total power  
supply voltage and plus the power in the IC due to the loads.  
POWER SUPPLY BYPASSING AND PRINTED CIRCUIT  
BOARD LAYOUT  
Good printed circuit board layout is necessary for optimum  
performance. A low impedance and clean analog ground  
plane should be used for the EL5225. The traces from the  
two ground pins to the ground plane must be very short.  
Lead length should be as short as possible and all power  
supply pins must be well bypassed. A 0.1µF ceramic  
P
= V × I + Σ[(V - V  
i) × I  
i]  
LOAD  
DMAX  
S
S
S
OUT  
when sourcing, and:  
P
= V × I + Σ(V  
i × I  
i)  
LOAD  
DMAX  
S
S
OUT  
capacitor must be place very close to the V , V  
,
S
REFH  
V
, and CAP pins. A 4.7µF local bypass tantalum  
when sinking.  
Where:  
REFL  
capacitor should be placed to the V , V  
pins.  
, and V  
REFL  
S
REFH  
• i = 1 to total 10  
APPLICATION USING THE EL5225  
• V = Supply voltage  
S
In the first application drawing, the schematic shows the  
interconnect of a pair of EL5225 chips connected to give  
• I = Quiescent current  
S
10 gamma corrected voltages above the V  
10 gamma corrected voltages below the V  
voltage, and  
voltage.  
COM  
COM  
• V  
i = Output voltage of the i channel  
OUT  
• I  
i = Load current of the i channel  
LOAD  
By setting the two P  
equations equal to each other, we  
DMAX  
s to avoid the device overheat. The  
can solve for the R  
LOAD  
package power dissipation curves provide a convenient way  
to see if the device will overheat.  
FN7356.0  
March 11, 2004  
10  
EL5225  
Application Drawing  
HIGH REFERENCE  
VOLTAGE  
COLUMN  
(SOURCE)  
DRIVER  
+10V  
REFH  
OUTA  
OUTB  
OUTC  
OUTD  
OUTE  
OUTF  
0.1µF  
+12V  
VS  
0.1µF  
LCD PANEL  
+5V  
0.1µF  
VSD  
MICROCONTROLLER  
SDI  
SCK  
ENA  
SDO  
HORIZONTAL  
RATE  
LCD  
TIMING  
OSC  
CONTROLLER  
CAP  
0.1µF  
OUTI  
REFL  
GND  
OUTJ  
EL5225  
MIDDLE REFERENCE VOLTAGE  
+5.5V  
REFH  
OSC  
OUTA  
OUTB  
OUTC  
OUTD  
OUTE  
OUTF  
+12V  
+5V  
VS  
0.1µF  
VSD  
0.1µF  
SDI  
SCK  
ENA  
CAP  
0.1µF  
LOW REFERENCE  
VOLTAGE  
+1V  
REFL  
0.1µF  
OUTI  
GND  
OUTJ  
EL5225  
FN7356.0  
March 11, 2004  
11  
EL5225  
TSSOP Package Outline Drawing  
NOTE: The package drawing shown here may not be the latest version. To check the latest revision, please refer to the Intersil  
website at <http://www.intersil.com/design/packages/index.asp>  
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.  
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality  
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without  
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and  
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result  
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.  
For information regarding Intersil Corporation and its products, see www.intersil.com  
FN7356.0  
March 11, 2004  
12  

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