Reference Voltage and Driver IC for LCD
Description
The CXD2475TQ is suitable IC for applying reference
voltage for gamma correction which is necessary for
TFT liquid crystal display. This IC has a built-in 9
channels of rail-to-rail buffer circuit which enables 2-
input switch and a common driver circuit.
Features
•Built-in 9 channels of rail-to-rail buffer circuit
•Built-in common driver circuit
•Current consumption: 3.6mA (typ.)
•Package: 48pin TQFP
Structure
Bi-CMOS IC
Applications
Small liquid crystal monitor
Absolute Maximum Ratings (Ta = 25°C)
•Supply voltage VCC∗17.0 V
VVG∗27.0 V
VVC∗3≤VCC + 0.2 V
VVG∗4≥GND – 0.2 V
•Operating temperature
Topr –25 to +85 °C
•Storage temperature
Tstg –55 to +150 °C
•Allowable power dissipation (Ta ≤25°C)
Pd 1.72 W
•Reduced ratio (Ta < 25°C) 13.8 mW/°C
Operating Conditions
•Supply voltage VCC∗14.5 to 5.0 to 5.5 V
VVG∗24.0 to VCC V
VVC∗34.0 to VCC V
VVG∗40 to 1.0 V
∗1Applied to Vcc – GND.
∗2Applied to COMVcc – COMGND
∗3Applied to COMVcc – GND
∗4Applied to COMGND – GND
– 1 – E99617-PS
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
CXD2475TQ
48 pin TQFP (Plastic)
– 2 –
CXD2475TQ
Block Diagram
1 2 3 4 5 6 7 8 9 10 11 12
13
14
15
16
17
18
19
20
21
22
23
24
252627282930313233343536
37
38
39
40
41
42
43
44
45
46
47
48
NC
GND
V7
V8
NC
Vcc
V2
V3
GND
COMVcc
COMOUT
NC
buff
NC
GND
V6
V5
V4
NC
Vcc
V1
V0
GND
NC
NC
VH3
VL3
VH2
VL2
VH1
VL1
VH0
VL0
SW
COMSW
COMGND
NC
NC
VL4
VH4
VL5
VH5
VL6
VH6
VL7
VH7
VL8
VH8
NC
– 3 –
CXD2475TQ
Pin Description
Pin
No. Symbol Pin voltage Equivalent circuit Description
1 VH3
0.2 to 4.8V
DC input when SW is high.
2VL3 DC input when SW is low.
3 VH2 DC input when SW is high.
4 VL2 DC input when SW is low.
5 VH1 DC input when SW is high.
6 VL1 DC input when SW is low.
7 VH0 DC input when SW is high.
8 VL0 DC input when SW is low.
26 VH8 DC input when SW is high.
27 VL8 DC input when SW is low.
28 VH7 DC input when SW is high.
29 VL7 DC input when SW is low.
30 VH6 DC input when SW is high.
31 VL6 DC input when SW is low.
32 VH5 DC input when SW is high.
33 VL5 DC input when SW is low.
34 VH4 DC input when SW is high.
35 VL4 DC input when SW is low.
0.2 to 4.8V
17 V3 V3 output.
18 V2 V2 output.
21 V8 V8 output.
22 V7 V7 output.
39 V6 V6 output.
40 V5 V5 output.
41 V4 V4 output.
44 V1 V1 output.
45 V0 V0 output.
9 SW Input switch.
VL is output for low; VH for high.
10 COMSW COM output switch.
COMVcc level is output for low;
COMGND level for high.
2
4
6
29
31
33
35
Vcc
GND
VH
VL
8
27
1
3
5
7
26
28
30
32
34
Vcc
GND
39
22
40
18
17
21
44
41
45
Vcc
GND
9
10
– 4 –
CXD2475TQ
19 Vcc 5.0V 5V power supply.
11 COMGND 0 to 1.0V COM output ground.
14 COMOUT COM output.
15 COMVcc 4.0 to Vcc COM power supply.
43 Vcc 5.0V 5V power supply.
16 GND GND.
23 GND GND.
38 GND GND.
46 GND GND.
12 NC No connected.
13 NC No connected.
20 NC No connected.
24 NC No connected.
25 NC No connected.
36 NC No connected.
37 NC No connected.
42 NC No connected.
47 NC No connected.
48 NC No connected.
Note)
•GND
Make sure that Pins 16, 23, 38 and 46 are connected to GND potential, and do not release them.
•Decoupling capacitor
Locate decoupling capacitor connected between power supply and GND as near IC pin as possible.
•Design VH and VL input pins not to have capacity.
COMVcc
COMOUT
COMGND
14
11
15
Pin
No. Symbol Pin voltage Equivalent circuit Description
– 5 –
CXD2475TQ
Electrical Characteristics (Ta = 25°C, Vcc = COMVcc = 5V, COMGND = 0V)
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
Item
Current consumption
(Vcc + COMVcc)
VH, VL input current high
VH, VL input current low
SW, COMSW input current high
SW, COMSW input current low
VREF voltage gain
VREF output voltage high
VREF output voltage low
COMOUT output voltage high
COMOUT output voltage low
VREF offset voltage
VREF load regulation
SW, COMSW input voltage high
SW, COMSW input voltage low
VREF transient time (1)
VREF transient time (2)
VREF propagation delay time
(1)
VREF propagation delay time
(2)
VREF propagation delay time
difference (1)
VREF propagation delay time
difference (2)
COM transient time
COM propagation delay time
COM propagation delay time
difference
Symbol
ICC
IIH
IIL
IISH
IISL
AV
VOH
VOL
VCOH
VCOL
VOFF
∆VO
VIH
VIL
ttvLH1
ttvHL1
ttvLH2
ttvHL2
tpvLH1
tpvHL1
tpvLH2
tpvHL2
∆tpv1
∆tpv2
ttcLH
ttcHL
tpcLH
tpcHL
∆tpc
Condition
Input voltage = 2.5V
Input voltage = 4.8V
Input voltage = 0.2V
Input voltage = 5V
Input voltage = 0V
Input voltage = 0.2 to 4.8V
ISOURCE = 10mA
ISINK = 10mA
ISOURCE = 10mA
ISINK = 10mA
Input voltage = 0.2 to 4.8V
ISOURCE = 10mA
ISINK = 10mA
Measurement circuit 1
Measurement circuit 2
Measurement circuit 1
Measurement circuit 2
tpvLH1 – tpvHL1
tpvLH2 – tpvHL2
Measurement circuit 3
Measurement circuit 3
tpcLH – tpcHL
Min.
—
–0.1
–0.1
–0.1
–0.4
0.985
Vcc – 0.2
—
COMVcc
– 0.1
—
—
—
2
—
—
—
—
—
—
—
—
—
—
Typ.
3.6
—
—
—
—
—
—
—
—
—
—
±5
—
—
5
3.5
3.5
2.5
—
—
3
1.6
—
Max.
6.0
0.1
0.1
0.1
0.1
—
—
0.2
—
COMGND
+ 0.1
20
±10
—
0.8
8
6
6
5
±1.6
±0.8
5
3
±1
Unit
mA
µA
µA
µA
µA
V/V
V
V
V
V
mV
mV
V
V
µs
µs
µs
µs
µs
µs
µs
µs
µs
– 6 –
CXD2475TQ
Measurement Circuits
Measurement circuit 1
VH 22Ω
27nF
4.8V
0.2V
Measurement point
VL
V0
Measurement circuit 2
VH
4.8V
0.2V
Measurement point
VL
V0
Measurement circuit 3
COMVcc
22Ω
27nF
5.0V
0V
Measurement point
COMGND
COMOUT
50%
SW/COMSW
Output waveform 50% 50%
90%
tpLH tpHL
ttLH ttHL
10%
– 7 –
CXD2475TQ
Application Circuit
1 2 3 4 5 6 7 8 9 10 11 12
13
14
15
16
17
18
19
20
21
22
23
24
252627282930313233343536
37
38
39
40
41
42
43
44
45
46
47
48
buff
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
Vcc
To LCD
To LCD
To LCD
To LCD
To LCD To LCD
To LCD
To LCD
To LCD
4.5V
0.5V
47µ0.01µ
5V
47µ0.01µ
47µ0.01µ
Polarity inverted pulse
To LCD (VCOM)
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for
any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
– 8 –
CXD2475TQ
Package Outline Unit: mm
48PIN TQFP (PLASTIC)
SONY CODE
EIAJ CODE
JEDEC CODE
PACKAGE STRUCTURE
PACKAGE MATERIAL
LEAD TREATMENT
LEAD MATERIAL
PACKAGE WEIGHT
EPOXY RESIN
SOLDER PLATING
42 ALLOY
TQFP-48P-L111
P-TQFP48-7x7-0.5
b
1.1MAX
B
0° to 10°
0.5 ± 0.15 (8.0 ± 0.15)
0.1 ± 0.1
b=0.2 ± 0.08
0.15 ± 0.05
DETAIL B : SOLDER
DETAIL A
S
S
0.10
0.8 ± 0.3
(1.0)
A
MS
0.15
0.5
9.0 ± 0.3
7.0 ± 0.2
112
36 25
37
48
24
13
0.14g
