EL5126 INTERSIL [Intersil Corporation], EL5126 Datasheet

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EL5126

Manufacturer Part Number
EL5126
Description
8-Channel TFT-LCD Reference Voltage Generator
Manufacturer
INTERSIL [Intersil Corporation]
Datasheet
8-Channel TFT-LCD Reference Voltage
Generator
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 serial interface.
A number of the EL5126 can be stacked for applications
requiring more than 8 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.
The EL5126 has 8 outputs and is available in a 32-pin LPP
package. It is specified for operation over the full -40°C to
+85°C temperature range.
Ordering Information
EL5126CL
EL5126CL-T7
EL5126CL-T13
PART NUMBER
32-Pin LPP
32-Pin LPP
32-Pin LPP
PACKAGE
The EL5126 is designed to produce
the reference voltages required in
TFT-LCD applications. Each output is
®
1
TAPE & REEL
Data Sheet
13”
7”
-
Copyright © Intersil Americas Inc. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
PKG. NO.
MDP0046
MDP0046
MDP0046
1-888-INTERSIL or 321-724-7143
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Features
• 8-channel reference outputs
• Accuracy of ±0.1%
• Supply voltage of 4.5V to 16.5V
• Digital supply 3.3V to 5V
• Low supply current of 10mA
• Rail-to-rail capability
• I
Applications
• TFT-LCD drive circuits
• Reference voltage generators
Pinout
2
C control interface
AGND
REFH
REFL
VSD
CAP
All other trademarks mentioned are the property of their respective owners.
NC
VS
VS
VS
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
1
2
3
4
5
6
7
8
9
April 2003
(32-PIN LPP)
TOP VIEW
THERMAL
THERMAL
EL5126
PAD
PAD
EL5126
25
24
23
22
21
20
19
18
17
FN7337.1
OUTA
OUTB
OUTC
OUTD
DGND
OUTE
OUTF
OUTG
OUTH

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EL5126 Summary of contents

Page 1

... The EL5126 has 8 outputs and is available in a 32-pin LPP package specified for operation over the full -40°C to +85°C temperature range. Ordering Information ...

Page 2

... Input Resistance SDIN DIN t Setup Time S t Hold Time H t Rise Time R t Fall Time F 2 EL5126 = 25°C) Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C Operating Temperature . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves = 5V 13V 2V REFH REFL CONDITION ...

Page 3

... INPUT CODE FIGURE 1. DIFFERENTIAL NONLINEARITY vs CODE 3 EL5126 PIN TYPE Power Positive power supply for analog circuits Power Positive power supply for digital circuits Analog Input High reference voltage Analog Input Low reference voltage Power Ground Analog Decoupling capacitor for internal reference generator ...

Page 4

... C =4.7nF L R =20Ω =180pF L FIGURE 5. TRANSIENT LOAD REGULATION (SINKING) M=400µs/DIV FIGURE 7. LARGE SIGNAL RESPONSE (FALLING FROM 8V TO 0V) 4 EL5126 (Continued) 0mA 5mA 5V 4.4 4.5 4.8 5 FIGURE 4. TRANSIENT LOAD REGULATION (SOURCING) FIGURE 6. LARGE SIGNAL RESPONSE (RISING FROM 0V SCLK SDA OUTPUT FIGURE 8. SMALL SIGNAL RESPONSE (RISING FROM 0V ...

Page 5

... 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 EL5126. As all of the output buffers are identical also possible to use the EL5126 for applications other than LCDs where multiple voltage references are required that can be set to 10 bit accuracy ...

Page 6

... Device Address and write/read bit. This address bit long device address and only two device addresses (74H and 75H) are allowed for the EL5126. The first 6 bits (A6 to A1, MSBs) of the device address have been factory programmed and are always 111010. Only the least significant bit A0 is allowed to change the logic state, which can be tied to VSD or DGND ...

Page 7

I C Timing Diagram 1 STANDARD MODE (STD/REG = HIGH) WRITE MODE Start Device Address W A Data Data CLK In 1 ...

Page 8

... STOP CONDITION CLOCK OSCILLATOR The EL5126 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 ...

Page 9

... This means that a large change of 16V can take between 3ms and 3.4ms depending on the absolute timing relative to the update cycle. 9 EL5126 EIGHT VOLTAGE CHANNEL SOURCES MEMORY ...

Page 10

... A low impedance and clean analog ground i plane should be used for the EL5126. The traces from the two ground pins to the ground plane must be very short. The thermal pad of the EL5126 should be connected to the analog ground plane. Lead length should be as short as possible and all power supply pins must be well bypassed. A 0.1µ ...

Page 11

... OUTA OSC +5V OSC_SEL +12V VS OUTB 0.1µF OUTC +5V VSD 0.1µF FILTER OUTD DATA IN SDA CLOCK SCL OUTE CAP 0.1µF OUTF LOW REFERENCE VOLTAGE REFL 0.1µF OUT STD GND OUTH EL5126 COLUMN (SOURCE) DRIVER LCD PANEL ADDRESS = H74 ADDRESS = H75 ...

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