MAX5439 [MAXIM]
±.15V.128-Tap.Low-Drift Digital Potentiometers ; ＆＃ 177.15V.128 - Tap.Low漂移数字电位器\n
| 型号： | MAX5439 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | ±.15V.128-Tap.Low-Drift Digital Potentiometers
|
| 文件： | 总11页 (文件大小：356K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2657; Rev 0; 10/02
±±5ꢀ, ±28-Tap, Low-Drift Digital Potentiometers
General Description
Features
The MAX5436–MAX5439 are 128-tap high-voltage ( 5ꢀ
to 15ꢀV ꢁigital poteꢂtioꢃeterꢄ iꢂ paꢅcageꢄ that are halꢆ
the ꢄize oꢆ ꢅoꢃparable ꢁeviꢅeꢄ iꢂ 8-piꢂ SO. They perꢆorꢃ
the ꢄaꢃe ꢆuꢂꢅtioꢂ aꢄ ꢃeꢅhaꢂiꢅal poteꢂtioꢃeterꢄ, but
replaꢅe the ꢃeꢅhaꢂiꢅꢄ with a ꢄiꢃple ꢁigital iꢂterꢆaꢅe. The
ꢁigital logiꢅ iꢄ powereꢁ by a ꢄeparate ꢄiꢂgle +2.7ꢀ to
ꢀ +10V to +30V Single-Supply Operation
ꢀ -28V to -10V Single Negative Supply Operation
ꢀ ±±V to ±1±V ꢀual-Supply Operation
ꢀ 128 Tap Positions
+5.25ꢀ ꢄupply voltage (ꢀ V. The reꢄiꢄtor ꢄtriꢂg uꢄeꢄ itꢄ
CC
ꢀ Uncommitted High-Voltage Amplifier
owꢂ aꢂalog ꢄupplieꢄ (ꢀ
aꢂꢁ ꢀ V that require
SS
DD
(MAX±437/MAX±439)
ꢀ
DD
- ꢀ to be greater thaꢂ 9ꢀ aꢂꢁ leꢄꢄ thaꢂ 31.5ꢀ. Thiꢄ
SS
ꢀ Low Temperature Coefficient
3±ppm/°C (End-to-End)
allowꢄ ꢆor greater ꢆlexibility iꢂ voltage raꢂgeꢄ that ꢅaꢂ be
uꢄeꢁ with theꢄe ꢁeviꢅeꢄ. Exaꢃpleꢄ oꢆ aꢂalog ꢄupply
raꢂgeꢄ iꢂꢅluꢁe ꢂot oꢂly ꢁual voltageꢄ oꢆ 5ꢀ to 15ꢀ, but
ꢄiꢂgle-ꢄupply voltageꢄ, ꢄuꢅh aꢄ +10ꢀ, +15ꢀ, +30ꢀ, -30ꢀ,
±ppm/°C (Ratiometric)
ꢀ Small-Footprint Packages
aꢂꢁ ꢃore, aꢄ loꢂg aꢄ the raꢂgeꢄ oꢆ ꢀ
SS
- ꢀ aꢂꢁ ꢀ
-
DD
SS
CC
10-Pin µMAX (MAX±436/MAX±438)
14-Pin TSSOP (MAX±437/MAX±439)
ꢀ
are ꢃet.
The MAX5437/MAX5439 iꢂꢅluꢁe aꢂ oꢂ-ꢅhip, high-
voltage, uꢂꢅoꢃꢃitteꢁ aꢃpliꢆier, proviꢁiꢂg aꢁꢁitioꢂal
reꢁuꢅtioꢂꢄ iꢂ boarꢁ ꢄpaꢅe aꢂꢁ ꢅoꢄt. Other ꢆeatureꢄ
iꢂꢅluꢁe low 35ppꢃ/°C eꢂꢁ-to-eꢂꢁ aꢂꢁ 5ppꢃ/°C ratio-
ꢃetriꢅ reꢄiꢄtor teꢃperature ꢅoeꢆꢆiꢅieꢂtꢄ, a 3-wire SPI™/
QSPI™/MICROWIRE™-ꢅoꢃpatible ꢄerial iꢂterꢆaꢅe, aꢂꢁ
a power-oꢂ reꢄet to ꢃiꢁꢄꢅale.
ꢀ Glitchless Switching Between the Resistor Taps
ꢀ 3-Wire SPI/QSPI/MICROWIRE-Compatible Serial
Interface
ꢀ ±0kΩ/100kΩ End-to-End Resistances
ꢀ Power-On Reset: Wiper Goes to Midscale
The MAX5436/MAX5438 are available iꢂ 10-piꢂ µMAX
paꢅcageꢄ. The MAX5437/MAX5439 are available iꢂ 14-
piꢂ TSSOP paꢅcage. Eaꢅh ꢁeviꢅe iꢄ guaraꢂteeꢁ over
the exteꢂꢁeꢁ teꢃperature raꢂge oꢆ -40°C to +85°C.
(Position 64)
Ordering Information
PIN-
PACKAGE
RESISTANCE
PART
TEMP RANGE
(kΩ)
MAX5436EUB -40°C to +85°C 10 µMAX
MAX5437EUD -40°C to +85°C 14 TSSOP
MAX5438EUB -40°C to +85°C 10 µMAX
MAX5439EUD -40°C to +85°C 14 TSSOP
50
50
Applications
LCD Sꢅreeꢂ Coꢂtraꢄt Aꢁjuꢄtꢃeꢂt
100
100
Data-Aꢅquiꢄitioꢂ Syꢄteꢃꢄ
Meꢅhaꢂiꢅal Poteꢂtioꢃeter Replaꢅeꢃeꢂt
Low-Driꢆt Prograꢃꢃable Gaiꢂ Aꢃpliꢆier
Auꢁio ꢀoluꢃe Coꢂtrol
Pin Configurations
TOP VIEW
1
2
3
4
5
6
7
14 V
CC
SCLK
DIN
SCLK
DIN
1
2
3
4
5
10 V
CC
13
12
L
9
8
7
6
L
MAX5436/
MAX5438
CS
W
CS
W
H
11 H
SHDN
GND
MAX5437/
MAX5439
GND
10
9
V
V
V
DD
SS
DD
IN+
IN-
V
SS
µMAX
OUT
8
SPI/QSPI are trademarks of Motorola, Inc.
TSSOP
MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
±±5ꢀ, ±28-Tap, Low-Drift Digital Potentiometers
ABSOLUTE MAXIMUM RATINGS
V
V
V
V
V
V
to GND, V = GND........................................-0.3V to +34V
Continuous Power Dissipation (T = +70°C)
DD
SS
DD
DD
CC
CC
SS
DD
A
to GND, V
= GND........................................-34V to +0.3V
10-Pin µMAX (derate 6.94mW/°C above +70°C).........556mW
14-Pin TSSOP (derate 9.1mW/°C above +70°C) .........727mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
to V ..............................................................-0.3V to +34V
to V ........................................................-6.3V to +28.75V
to V ..............................................................-0.3V to +34V
to GND..............................................................-0.3V to +6V
SS
CC
SS
DIN, SCLK, CS, SHDN ...............................-0.3V to (V
+ 0.3V)
+ 0.3V)
CC
DD
H, L, W, IN+, IN-, OUT .....................(V - 0.3V) to (V
SS
Maximum Continuous Current into H, L, and W
MAX5436–MAX5439....................................................... 1mA
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
= +15V, V = -15V, V
= +25°C, unless otherwise noted.)
= +5V, V = V , V = V , T = -40°C to +85°C, unless otherwise noted. Typical values are at
DD
SS
CC
H
DD
L
SS
A
T
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC PERFORMANCE (Voltage-Divider Mode)
Resolution
2N
128
Taps
LSB
Integral Nonlinearity
Differential Nonlinearity
End-to-End Resistor Tempco
Ratiometric Resistor Tempco
Full-Scale Error
INL
DNL
(Note 1)
(Note 1)
1
1
LSB
TC
35
5
ppm/°C
ppm/°C
LSB
R
R
R
R
R
= 50kΩ (MAX5436/MAX5438)
= 50kΩ (MAX5436/MAX5438)
= 100kΩ (MAX5437/MAX5439)
= 100kΩ (MAX5437/MAX5439)
-0.3
+0.3
-0.15
+0.15
HL
HL
HL
HL
Zero-Scale Error
LSB
Full-Scale Error
LSB
Zero-Scale Error
LSB
DC PERFORMANCE (Variable-Resistor Mode)
Resolution
2N
128
Taps
LSB
LSB
Integral Nonlinearity
Differential Nonlinearity
INL
DNL
(Note 2)
(Note 2)
1
1
DC PERFORMANCE (Resistor Characteristics)
Wiper Resistance
Wiper Capacitance
W
(Note 3)
0.9
6
2
kΩ
R
C
W
Midscale
pF
MAX5437/MAX5439
MAX5436/MAX5438
75
100
50
125
End-to-End Resistance
R
HL
kΩ
37.5
62.5
DIGITAL INPUTS
Input High Voltage
Input Low Voltage
V
V
= 4.75V to 5.25V (Note 4)
= 4.75V to 5.25V
2.4
V
V
CC
CC
0.8
2
_______________________________________________________________________________________
±±5ꢀ, ±28-Tap, Low-Drift Digital Potentiometers
ELECTRICAL CHARACTERISTICS (continued)
(V
= +15V, V = -15V, V
= +25°C, unless otherwise noted.)
= +5V, V = V , V = V , T = -40°C to +85°C, unless otherwise noted. Typical values are at
DD
SS
CC
H
DD
L
SS
A
T
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input High Voltage
Input Low Voltage
Input Leakage Current
Input Capacitance
V
V
= 2.7V to 3.6V
= 2.7V to 3.6V
2.0
V
V
CC
CC
0.6
1.0
µA
pF
5.0
DYNAMIC CHARACTERISTICS (Analog)
R
C
= 50kΩ, midscale, V = 1.5V
,
HL
H
P-P
400
200
5
= 20pF, voltage-divider mode
WIPER
Wiper -3dB Bandwidth
Wiper Settling Time
BW
kHz
µs
W
R
C
= 100kΩ, midscale, V = 1.5V
,
HL
H
P-P
= 20pF, voltage-divider mode
WIPER
C
= 20pF, code 1 to code 127, settle
WIPER
t
IL
to 0.5LSB
AMPLIFIER CHARACTERISTICS (Analog)
Input Bias Current
Input Offset Voltage
Offset-Voltage Temperature Drift
Input Offset Current
Unity-Gain Bandwidth
Slew Rate
I
15
6
nA
mV
B
V
OS
V
10
µV/°C
nA
OSD
I
2
OS
UBW
SR
C
= 250pF
100
0.25
100
110
kHz
V/µs
V/mV
nV/√Hz
V
A
LOAD
Large-Signal Voltage Gain
Input Noise
A
R
= 100kΩ, V
= 14V
VO
LOAD
OUT
V
f = 1kHz
N
Input Compliance
Output Compliance
DC CMRR
CMR
V
V
+ 1
V
- 2
I
SS
SS
DD
DD
CMR
I
=
LOAD
5mA
+ 1
V
- 1
V
O
CMRR
PSRR
68
70
dB
DC PSRR
dB
TIMING CHARACTERISTICS (Digital) (Note 5, Figure 3)
SCLK Clock Frequency
SCLK Clock Period
f
0
10
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
CLK
t
100
40
40
40
10
40
0
CP
SCLK Pulse Width High
SCLK Pulse Width Low
CS Fall to SCLK Rise Setup Time
SCLK Rise to CS Rise Hold Time
DIN Setup Time
t
CH
t
CL
t
CSS
CSH
t
t
DS
DIN Hold Time
t
DH
SCLK Rise to CS Fall Delay
CS Rise to SCLK Rise Hold
CS Pulse Width High
t
10
40
100
CSO
t
CS1
t
CSW
POWER SUPPLIES
Positive Analog Supply Voltage
Negative Analog Supply Voltage
V
0
31.5
0
V
V
DD
V
-28.8
SS
_______________________________________________________________________________________
3
±±5ꢀ, ±28-Tap, Low-Drift Digital Potentiometers
ELECTRICAL CHARACTERISTICS (continued)
(V
= +15V, V = -15V, V
= +25°C, unless otherwise noted.)
= +5V, V = V , V = V , T = -40°C to +85°C, unless otherwise noted. Typical values are at
DD
SS
CC
H
DD
L
SS
A
T
A
PARAMETER
SYMBOL
CONDITIONS
MIN
9.0
TYP
MAX
31.5
5.25
UNITS
Analog Supply Separation
Digital Supply Voltage
V
V
V
- V
- V
V
V
DS
CC
DD
CC
SS
V
2.70
Digital Supply to Negative Analog
Supply Separation
V
2.7
31.5
V
CS
SS
Power-On Reset Threshold
Digital Supply Current
POR
1.6
30
V
I
(Note 4)
50
60
µA
CC
MAX5436/MAX5438
SHDN = GND for MAX5437/MAX5439
30
105
55
Positive Analog Supply Current
Negative Analog Supply Current
I
µA
µA
DD
SHDN = V
215
110
250
CC
MAX5436/MAX5438
SHDN = GND for MAX5437/MAX5439
I
SS
SHDN = V
130
CC
Note 1: The DNL and INL are measured with the potentiometer configured as a voltage-divider with H = V
and L = V . The
SS
DD
wiper terminal is unloaded.
Note 2: The DNL and INL are measured with the potentiometer configured as a variable resistor. H is unconnected and L = V
.
SS
The wiper terminal is driven with a source current of 80µA for the 50kΩ configuration and 40µA for the 100kΩ configuration.
Note 3: The wiper resistance is measured assuming the source currents given in Note 2.
Note 4: Device draws current in excess of the specified supply current when a digital input is driven with a voltage of V < V
-
IN
CC
0.6V or V > 0.5V. This is due to the CMOS input stage crowbar current. At V = 2.4V with V
= 5.25V, this supply current
IN
IN
CC
can be as high as 1.6mA.
Note 5: Guaranteed by design and characterization.
4
_______________________________________________________________________________________
±±5ꢀ, ±28-Tap, Low-Drift Digital Potentiometers
Typical Operating Characteristics
(V
= +15V, V = -15V, V
= +5V, V = V , V = V , T = +25°C, unless otherwise noted.)
CC H DD L SS A
DD
SS
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
WIPER RESISTANCE vs. INPUT CODE
WIPER RESISTANCE vs. INPUT CODE
0.15
0.10
0.05
0
1100
1075
1050
1025
1000
975
3000
V
V
= +5V
= -5V
DD
SS
CONDITIONS OF NOTE 2
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
CONDITIONS OF NOTE 2
50kΩ
-0.05
-0.10
-0.15
-0.20
-0.25
950
925
100kΩ
900
875
850
-40
-15
10
35
60
85
0
16 32 48 64 80 96 112 128
INPUT CODE
0
16 32 48 64 80 96 112 128
INPUT CODE
TEMPERATURE (°C)
MIDSCALE SWITCHING TRANSIENT
(CODE 63 TO CODE 64)
W-TO-L RESISTANCE CHANGE
vs. INPUT CODE
DIGITAL SUPPLY CURRENT
vs. TEMPERATURE
MAX5436 toc06
100
90
80
70
60
50
40
30
20
10
0
40
35
30
25
20
15
10
100kΩ
CS
2V/div
50kΩ
V
W-L
100mV/div
C
= 20pF
WIPER
0
16 32 48 64 80 96 112 128
INPUT CODE
-40
-15
10
35
60
85
100ns/div
TEMPERATURE (°C)
VARIABLE-RESISTOR DNL
vs. INPUT CODE (50kΩ)
VARIABLE-RESISTOR DNL
vs. INPUT CODE (100kΩ)
VARIABLE-RESISTOR INL
vs. INPUT CODE (50kΩ)
0.10
0.08
0.06
0.04
0.02
0
0.10
0.08
0.06
0.04
0.02
0
0.30
0.25
0.20
0.15
0.10
0.05
0
CONDITIONS OF NOTE 2
CONDITIONS OF NOTE 2
CONDITIONS OF NOTE 2
-0.02
-0.04
-0.06
-0.08
-0.10
-0.02
-0.04
-0.06
-0.08
-0.10
-0.05
-0.10
0
16 32 48 64 80 96 112 128
INPUT CODE
0
16 32 48 64 80 96 112 128
INPUT CODE
0
16 32 48 64 80 96 112 128
INPUT CODE
_______________________________________________________________________________________
5
±±5ꢀ, ±28-Tap, Low-Drift Digital Potentiometers
Typical Operating Characteristics (continued)
(V
= +15V, V = -15V, V
= +5V, V = V , V = V , T = +25°C, unless otherwise noted.)
DD
SS
CC
H
DD
L
SS
A
VOLTAGE-DIVIDER DNL
vs. INPUT CODE (100kΩ)
VARIABLE-RESISTOR INL
vs. INPUT CODE (100kΩ)
VOLTAGE-DIVIDER DNL
vs. INPUT CODE (50kΩ)
0.010
0.008
0.006
0.004
0.002
0
0.25
0.010
CONDITIONS OF NOTE 2
0.008
0.006
0.004
0.002
0
0.20
0.15
0.10
0.05
0
-0.002
-0.004
-0.006
-0.008
-0.010
-0.002
-0.004
-0.006
-0.008
-0.010
-0.05
-0.10
-0.15
0
16 32 48 64 80 96 112 128
INPUT CODE
0
16 32 48 64 80 96 112 128
INPUT CODE
0
16 32 48 64 80 96 112 128
INPUT CODE
VOLTAGE-DIVIDER INL
vs. INPUT CODE (50kΩ)
VOLTAGE-DIVIDER INL
vs. INPUT CODE (100kΩ)
WIPER FREQUENCY RESPONSE
AT MIDSCALE (100kΩ)
0.05
0.04
0.03
0.02
0.01
0
0.05
0.04
0.03
0.02
0.01
0
0
V
= 1.5V
P-P
WIPER
H
C
-2
-4
= 20pF
-6
-8
-10
-12
-14
-16
-18
-20
-0.01
-0.02
-0.03
-0.04
-0.05
-0.01
-0.02
-0.03
-0.04
-0.05
0
16 32 48 64 80 96 112 128
INPUT CODE
0
16 32 48 64 80 96 112 128
INPUT CODE
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
AMPLIFIER SMALL-SIGNAL
FREQUENCY RESPONSE
AMPLIFIER OUTPUT
vs. OUTPUT LOAD CURRENT
AMPLIFIER INPUT-REFERRED OFFSET
vs. TEMPERATURE
5
0
14.000
13.999
13.998
13.997
13.996
13.995
0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
-1.4
-1.6
-1.8
-2.0
V
= 50mV
V = +13V
IN
IN
P-P
UNITY GAIN
GAIN SETTING 1.077
-5
-10
-15
-20
0.01
0.1
1
10
100
1000
0
2
4
6
8
10
-40
-15
10
35
60
85
FREQUENCY (kHz)
LOAD CURRENT (mA)
TEMPERATURE (°C)
6
_______________________________________________________________________________________
±±5ꢀ, ±28-Tap, Low-Drift Digital Potentiometers
Pin Description
PIN
NAME
DESCRIPTION
MAX5436/
MAX5438
1
MAX5437/
MAX5439
1
SCLK
DIN
Serial Clock Input
Serial Data Input
2
3
2
3
CS
Chip Select
—
4
4
SHDN
GND
Amplifier Shutdown
Analog and Digital Ground
5
5
6
V
Negative Analog Supply. Bypass with a 0.1µF capacitor to GND.
Amplifier Output
SS
—
—
—
6
7
OUT
IN-
8
Amplifier Negative Input
9
IN+
Amplifier Positive Input
10
11
12
13
14
V
Positive Analog Supply. Bypass with a 0.1µF capacitor to GND.
High Terminal of Resistor
DD
7
H
8
W
L
Wiper Terminal of Resistor
9
Low Terminal of Resistor
10
V
Digital Supply. Bypass with a 0.1µF capacitor to GND.
CC
Adjustable Gain Amplifier
The MAX5436/MAX5438 are used with the MAX427 to
make a digitally adjustable gain circuit as shown in
Figure 4. The normal feedback resistor is replaced with
the MAX5436/MAX5438 in a variable-resistor configura-
tion so that the gain of the circuit can be digitally con-
trolled. The MAX5437/MAX5439 can use the internal
high-voltage amplifier to make this digitally adjustable
gain circuit.
Detailed Description
Digital Interface Operation
The MAX5436–MAX5439 use a 3-wire SPI/QSPI/
MICROWIRE-compatible serial data interface to control
the wiper position. This write-only interface contains
three inputs: chip select (CS), data in (DIN), and serial
clock (SCLK). When CS is taken low, data from DIN is
synchronously loaded into the serial shift register on the
rising edge of each SCLK pulse (Figure 2). The 8-bit
data word requires 8 clock pulses to input the serial
data. Note that the first bit of the data word, D7, is
unused and should be ignored. Therefore, the second
rising edge of SCLK loads the MSB. After all the data
bits have been shifted in, they are latched into the
potentiometer control register when CS transitions from
low to high, the wiper position is then updated. Note
that if CS is not kept low during the entire data stream,
the data will be corrupted and the device will need to
be reloaded.
LCD Biasing Control Applications
The MAX5436–MAX5439 are ideal for LCDs that require
separate voltage for contrast control in addition to the
main supply voltage. Figure 5a shows the MAX5436–
MAX5439 being used for LCD contrast control along with
the MAX629, which provides the LCD supply voltage. A
similar circuit with an additional buffer circuit is shown in
Figure 5b.
Applications Information
Power-Up Sequencing
The MAX5436–MAX5439 have been designed so that
any of the supplies can turn on first without causing any
unwanted crowbar currents to flow. Note that both digital
and analog supplies are required to power up the wiper
and uncommitted amplifier (MAX5437/MAX5439 only).
_______________________________________________________________________________________
7
±±5ꢀ, ±28-Tap, Low-Drift Digital Potentiometers
DATA WORD
D7
D6
D5
D4
D3
D2
D1
D0
Don’t Care
(MSB)
(LSB)
First Bit
Loaded
Last Bit Loaded
Figure 1. Serial Data Format
WIPER POSITION UPDATED
CS
SCLK
DIN
MSB LOADED
D6
LAST BIT LOADED
D7
D5
D4
D3
D2
D1
D0
MSB
LSB
TIME
Figure 2. Serial Interface Timing Diagram
CS
t
CSW
t
CS1
t
CSS
t
CP
t
t
CSH
CH
t
t
CL
CSO
SCLK
t
DS
t
DH
DIN
Figure 3. Detailed Serial Interface Timing Diagram
8
_______________________________________________________________________________________
±±5ꢀ, ±28-Tap, Low-Drift Digital Potentiometers
+15V
V
S
MAX427
V
O
-15V
R2
L
H
MAX5436–
MAX5439
R1
W
V /V = 1 + R /R
O
S
2
1
Figure 4. Noninverting Amplifier
V
BATT
DC/DC CONVERTER
(SIMPLIFIED)
FIXED 28V IN
V
OUT
(LCD BIAS)
CONTROL
LCD
PANEL
MAX5436–
MAX5439
16V TO 26V CONTRAST ADJUST
MAX629
MICROCONTROLLER/MICROPROCESSOR
Figure 5a. Simplified LCD Contrast Control Circuit
V
BATT
DC/DC CONVERTER
(SIMPLIFIED)
FIXED 28V IN
V
OUT
(LCD BIAS)
CONTROL
LCD
PANEL
MAX629
MAX5437/
MAX5439
16V TO 26V CONTRAST ADJUST
MICROCONTROLLER/MICROPROCESSOR
Figure 5b. Simplified LCD Contrast Control Circuit with Buffer
_______________________________________________________________________________________
9
±±5ꢀ, ±28-Tap, Low-Drift Digital Potentiometers
Functional Diagrams
V
V
CC
CC
H
H
R
R
R
R
128
7
7-BIT
LATCH
7
128
7
7-BIT
LATCH
7
W
DECODE
W
DECODE
7-BIT
SHIFT
REGISTER
7-BIT
SHIFT
REGISTER
DIN
DIN
L
L
MAX5437/
MAX5439
V
V
V
V
DD
DD
SS
SS
MAX5436/
MAX5438
SCLK
CS
SCLK
CS
POR
POR
CLOCK
LOGIC
CLOCK
LOGIC
OUT
GND
GND
IN+ IN-
SHDN
Chip Information
TRANSISTOR COUNT: 2556
PROCESS: BiCMOS
10 ______________________________________________________________________________________
±±5ꢀ, ±28-Tap, Low-Drift Digital Potentiometers
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
e
4X S
10
10
INCHES
DIM MIN
MAX
MILLIMETERS
MIN
-
MAX
1.10
0.15
0.95
3.05
3.00
3.05
3.00
5.05
0.70
A
-
0.043
0.006
0.037
0.120
0.118
0.120
0.118
0.199
A1
A2
D1
D2
E1
E2
H
0.002
0.030
0.116
0.114
0.116
0.114
0.187
0.05
0.75
2.95
2.89
2.95
2.89
4.75
0.40
H
ÿ 0.50±0.1
0.6±0.1
L
0.0157 0.0275
0.037 REF
L1
b
0.940 REF
0.007
0.0106
0.177
0.090
0.270
1
1
e
0.0197 BSC
0.500 BSC
0.6±0.1
c
0.0035 0.0078
0.0196 REF
0.200
BOTTOM VIEW
E2
0.498 REF
S
TOP VIEW
D2
α
0∞
6∞
0∞
6∞
GAGE PLANE
A2
c
A
E1
b
L
α
A1
D1
L1
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 10L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0061
I
1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, ±20 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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