19-4564; Rev 0; 4/09
IT
TION K
VALUA
E
BLE
AVAILA
7-Bit, Programmable VCOM Reference
with 30x MOTP Memory
General Description
The MAX9660 provides a programmable reference volt-
age for VCOM adjustment in TFT-LCD panels. A 7-bit,
current digital-to-analog converter (DAC) sinks current
from an external resistor-divider string to create the
VCOM reference voltage, which then serves as the input
to a voltage buffer capable of driving out high current.
The MAX9660 includes multiple one-time programma-
ble (MOTP) memory to store the DAC code on the chip,
eliminating the need for external EEPROM. The chip
supports up to 30 write operations to MOTP memory.
The MAX9660 has an I
2
C interface to set the VCOM ref-
erence voltage and write into MOTP memory.
Features
o
VCOM Amplifier with 900mA Peak Output Current
o
Integrated Nonvolatile Memory to Store VCOM
Setting
o
7-Bit, Adjustable Sink-Current Device
o
Resistor-Adjustable, Full-Scale Range
o
2.5V to 3.6V Logic Supply Range
o
8V to 20V Analog Supply Range
MAX9660
Pin Configuration
SDA
6
3
VCOM
SET
DVDD
5
4
GND
AVDD
R
1
R
2
VCOM
Applications
TFT-LCD Panels
Instrumental Control Voltage Source
8
MAX9660
+
Ordering Information
PART
MAX9660ATA+
TEMP RANGE
-40°C to +125°C
PIN-PACKAGE
8 TDFN-EP*
1
OUT
OUT
SET
R
SET
TDFN
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
Functional Diagram
DVDD
AVDD
19R
MAX9660
SDA
SCL
I
2
C AND MOTP
CONTROLLER
7
7
R
MOTP MEMORY
GND
________________________________________________________________
Maxim Integrated Products
AVDD
SCL
7
2
TOP VIEW
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
7-Bit, Programmable VCOM Reference
with 30x MOTP Memory
MAX9660
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
DVDD, SET, SCL, and SDA to GND .....................-0.3V to +4V
AVDD to GND.....................................................-0.3V to +22V
OUT to GND .......................................................-0.3V to +22V
VCOM to GND .......................................-0.3V to AVDD + 0.3V
Continuous Current
SDA .................................................................................10mA
VCOM .........................................................................±100mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin TDFN-EP (derate 18.5mW/°C above +70°C)
Single-Layer Board ..................................................1481mW
8-Pin TDFN-EP (derate 24.4mW/°C above +70°C)
Multilayer Board .......................................................1951mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
DVDD
= 3.3V, V
AVDD
= 16V, V
GND
= 0, R
SET
= 6.8kΩ, no load, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
PARAMETER
SUPPLIES
Digital Supply Voltage Range
Analog Supply Voltage Range
Analog Quiescent Current
Analog Supply Current Range for
Programming MOTP
Digital Quiescent Current
MOTP Programming Times
VCOM OUTPUT (VCOM)
Common-Mode Range
Total Output Error
Output Voltage Swing Low
Output Voltage Swing High
Output Load Regulation
Short-Circuit Current (Note 2)
Power-Supply Rejection Ratio
Slew Rate
Bandwidth
V
ERR
V
OL
V
OH
LR
I
SC
PSRR
SR
dB
T
A
= +25°C,
V
VCOM
from 2V to V
AVDD
- 2V
I
L
= -5mA, V
OUT
= 0
I
L
= +5mA, V
OUT
= V
AVDD
I
L
= -80mA to +80mA
VCOM = AVDD
VCOM = GND
8V
≤
V
AVDD
≤
20V, V
OUT
= 5V
4V
P-P
at VCOM, 10% to 90%,
R
L
= 10kΩ, C
L
= 20pF
R
L
= 10kΩ, C
L
= 20pF,
V
VCOM
= 100mV
P-P
70
45
20
V
AVDD
- 150
±0.2
-900
+900
0.2
-22
V
AVDD
- 0.2
+22
150
V
mV
mV
mV
mV/mA
mA
dB
V/µs
MHz
V
DVDD
V
AVDD
I
AVDD
I
AVDD
I
DVDD
MOTP
SET
30
T
A
= +25°C
T
A
= +85°C
200
2.5
8
4.5
15
3.3
3.6
20
10
20
45
500
V
V
mA
mA
µA
Times
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
7-Bit, Programmable VCOM Reference
with 30x MOTP Memory
ELECTRICAL CHARACTERISTICS (continued)
(V
DVDD
= 3.3V, V
AVDD
= 16V, V
GND
= 0, R
SET
= 6.8kΩ, no load, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
PARAMETER
DVR
OUT Voltage Range
Resolution
Integral Nonlinearity Error
Differential Nonlinearity Error
AVDD to V
SET
Ratio
Set External Resistance
Set Current
Set Zero-Scale Error
Set Full-Scale Error
LOGIC INPUTS (SDA, SCL)
Input High Voltage
Input Low Voltage
SDA Output Low Voltage
Input Leakage Current
Input Capacitance
I
2
C TIMING CHARCTERISTICS
Serial-Clock Frequency
Bus Free Time Between STOP
and START Conditions
Hold Time START Condition
SCL Pulse-Width Low
SCL Pulse-Width High
Setup Time for a START
Condition
Data Hold Time
Data Setup Time
SDA and SCL Receiving Rise
Time
SDA and SCL Receiving Fall
Time
SDA Transmitting Fall Time
f
SCL
t
BUF
t
HD, STA
t
LOW
t
HIGH
t
SU, STA
t
HD, DAT
t
SU, DAT
t
R
t
F
t
F
(Note 3)
(Note 4)
(Note 4)
(Note 4)
0
1.3
0.6
1.3
0.6
0.6
0
100
20 +
0.1C
B
20 +
0.1C
B
20 +
0.1C
B
300
300
250
900
400
kHz
µs
µs
µs
µs
µs
ns
ns
ns
ns
ns
V
IH
V
IL
V
OL
I
IH
, I
IL
I
SINK
= 6mA
0V or V
DVDD
-3
0.01
5
0.7 x
V
DVDD
0.3 x
V
DVDD
0.4
+3
V
V
V
µA
pF
V
OUT
RES
INL
DNL
AVDD/V
SET
R
SET
I
SET
SET
ZSE
SET
FSE
V
AVDD
= 8V
V
AVDD
= 18V
Through R
SET
3.35
6.75
V
SET
+
0.5V
7
0.125
0.125
20:1
67
135
134
±2
±4
20
V
Bits
LSB
LSB
V/V
kΩ
µA
LSB
LSB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX9660
_______________________________________________________________________________________
3
7-Bit, Programmable VCOM Reference
with 30x MOTP Memory
MAX9660
ELECTRICAL CHARACTERISTICS (continued)
(V
DVDD
= 3.3V, V
AVDD
= 16V, V
GND
= 0, R
SET
= 6.8kΩ, no load, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
PARAMETER
Bus Capacitance
Pulse Width of Suppressed Spike
SYMBOL
C
B
t
SP
0
CONDITIONS
MIN
TYP
MAX
400
50
UNITS
pF
ns
Note 1:
Note 2:
Note 3:
Note 4:
All devices are 100% production tested at T
A
= +25°C. Specifications over temperature limits are guaranteed by design.
Short-circuit current is for a 1µs pulsed current only, not to exceed thermal characteristics of package.
Data hold time is tested in receive mode only.
C
B
is in pF.
4
_______________________________________________________________________________________
7-Bit, Programmable VCOM Reference
with 30x MOTP Memory
Typical Operating Characteristics
(Typical
Application Circuit,
V
DVDD
= 3.3V, V
AVDD
= 16V, R
SET
= 7kΩ, R
1
= R
2
= 35kΩ, T
A
= +25°C, unless otherwise noted.)
INL vs. CODE
MAX9660 toc01
MAX9660
DNL vs. CODE
MAX9660 toc02
DAC PSRR vs. FREQUENCY
-10
-20
-30
PSRR (dB)
-40
-50
-60
-70
-80
-90
-100
MAX9660 toc03
0.20
0.15
0.10
0.20
0.15
0.10
DNL (LSB)
0.05
0
-0.05
-0.10
-0.15
-0.20
0
INL (LSB)
0.05
0
-0.05
-0.10
-0.15
-0.20
0
32
64
CODE (NUMERIC)
96
128
0
32
64
CODE (NUMERIC)
96
128
10
100
1000
10,000
FREQUENCY (kHz)
OUTPUT OFFSET
VOLTAGE DISTRIBUTION
MAX9660 toc04
VCOM LOAD REGULATION
8
6
LOAD VOLTAGE (mV)
4
V
VCOM
(V)
2
0
-2
-4
-6
-8
15.8
MAX9660 toc05
V
VCOM
vs. I
SOURCE
MAX9660 toc06
0.25
10
16.1
0.20
16.0
N (%)
0.15
15.9
0.10
0.05
0
BELOW 0.65 2.41 4.17 5.93 7.69 ABOVE
-0.23 1.53 3.29 5.05 6.81 8.57
OUTPUT OFFSET (mV)
-10
-80
-60
-40
-20
0
20
40
60
80
LOAD CURRENT (mA)
15.7
0
5
10 15 20 25 30 35 40 45 50
I
SOURCE
(mA)
V
VCOM
vs. I
SINK
MAX9660 toc07
VCOM PSRR vs. FREQUENCY
-10
-20
-30
MAX9660 toc08
VCOM BUFFER PULSE LOAD TRANSIENT
MAX9660 toc09
0.15
0
0.12
V
VCOMOUT
200mV/div
V
VCOM
(V)
PSRR (dB)
0.09
-40
-50
-60
-70
I
VCOMOUT
500mA/div
0.06
0.03
-80
-90
0
-50 -45 -40 -35 -30 -25 -20 -15 -10 -5
I
SINK
(mA)
0
-100
10
100
1000
10,000
2μs/div
FREQUENCY (kHz)
_______________________________________________________________________________________
5
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