Maxim Integrated Producs MAX1044EPA, MAX1044C/D, MAX1044CSA, MAX1044CPA Datasheet

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19-4667; Rev 1; 7/94

Switched-Capacitor Voltage Converters

_______________General Description

The MAX1044 and ICL7660 are monolithic, CMOS switched-capacitor voltage converters that invert, double, divide, or multiply a positive input voltage. They are pin compatible with the industry-standard ICL7660 and LTC1044. Operation is guaranteed from 1.5V to 10V with no external diode over the full temperature range. They deliver 10mA with a 0.5V output drop. The MAX1044 has a BOOST pin that raises the oscillator frequency above the audio band and reduces external capacitor size requirements.

The MAX1044/ICL7660 combine low quiescent current and high efficiency. Oscillator control circuitry and four power MOSFET switches are included on-chip. Applications include generating a -5V supply from a +5V logic supply to power analog circuitry. For applications requiring more power, the MAX660 delivers up to 100mA with a voltage drop of less than 0.65V.

________________________Applications

-5V Supply from +5V Logic Supply Personal Communications Equipment Portable Telephones

Op-Amp Power Supplies

EIA/TIA-232E and EIA/TIA-562 Power Supplies

Data-Acquisition Systems

Hand-Held Instruments

Panel Meters

__________Typical Operating Circuit

CAP+

V+

 

INPUT

 

SUPPLY

 

 

 

 

VOLTAGE

MAX1044

ICL7660

CAP-

NEGATIVE

VOUT OUTPUT

VOLTAGE

GND

NEGATIVE VOLTAGE CONVERTER

____________________________Features

Miniature µMAX Package

1.5V to 10.0V Operating Supply Voltage Range

98% Typical Power-Conversion Efficiency

Invert, Double, Divide, or Multiply Input Voltages

BOOST Pin Increases Switching Frequencies (MAX1044)

No-Load Supply Current: 200µA Max at 5V

No External Diode Required for Higher-Voltage Operation

______________Ordering Information

PART

TEMP. RANGE

PIN-PACKAGE

MAX1044CPA

0°C to +70°C

8 Plastic DIP

MAX1044CSA

0°C to +70°C

8 SO

MAX1044C/D

0°C to +70°C

Dice*

MAX1044EPA

-40°C to +85°C

8 Plastic DIP

Ordering Information continued at end of data sheet.

* Contact factory for dice specifications.

_________________Pin Configurations

TOP VIEW

(N.C.) BOOST

1

 

8

V+

CAP+

2

MAX1044

7

OSC

 

 

 

 

GND

3

ICL7660

6

LV

 

CAP-

4

 

5

VOUT

 

 

DIP/SO/µMAX

 

 

 

 

V+ AND CASE

 

 

 

N.C.

8

OSC

 

 

 

1

 

7

 

CAP+

2

ICL7660

 

LV

 

 

6

 

GND

 

5

VOUT

 

3

 

 

 

 

4

 

 

( ) ARE FOR ICL7660

CAP-

TO-99

 

________________________________________________________________ Maxim Integrated Products 1

MAX1044/ICL7660

Call toll free 1-800-998-8800 for free samples or literature.

MAX1044/ICL7660

Switched-Capacitor Voltage Converters

ABSOLUTE MAXIMUM RATINGS

Supply Voltage (V+ to GND, or GND to VOUT)....................

10.5V

Input Voltage on Pins 1, 6, and 7 .........

-0.3V

≤ VIN ≤ (V+ + 0.3V)

LV Input Current ..................................................................

 

 

20µA

Output Short-Circuit Duration (V+ ≤ 5.5V)..................

 

Continuous

Continuous Power Dissipation (TA = +70°C)

 

727mW

Plastic DIP (derate 9.09mW/°C above +70°C) ............

SO (derate 5.88mW/°C above +70°C).........................

 

471mW

µMAX (derate 4.1mW/°C above +70°C) ......................

 

330mW

CERDIP (derate 8.00mW/°C above +70°C)

.................640mW

TO-99 (derate 6.67mW/°C above +70°C)....................

533mW

Operating Temperature Ranges

 

MAX1044C_ _ /ICL7660C_ _ ..............................

0°C to +70°C

MAX1044E_ _ /ICL7660E_ _ ............................

- 40°C to +85°C

MAX1044M_ _ /ICL7660M_ _ ........................

- 55°C to +125°C

Storage Temperature Range ............................

- 65°C to + 150°C

Lead Temperature (soldering, 10sec) .............................

+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

(Circuit of Figure 1, V+ = 5.0V, LV pin = 0V, BOOST pin = open, ILOAD = 0mA, TA = TMIN to TMAX, unless otherwise noted.)

PARAMETER

CONDITIONS

MAX1044

ICL7660

UNITS

MIN TYP MAX

MIN TYP MAX

 

 

 

 

 

 

 

 

 

 

 

 

 

RL = ∞ ,

TA = +25°C

30

200

80

175

 

 

pins 1 and 7

TA = 0°C to +70°C

 

200

 

225

 

Supply Current

no connection,

TA = -40°C to +85°C

 

200

 

250

µA

 

LV open

 

 

 

 

 

 

 

TA = -55°C to +125°C

 

200

 

250

 

 

 

 

 

 

 

RL = ∞ , pins 1 and 7 = V+ = 3V

10

 

 

 

 

Supply Voltage

RL = 10kΩ , LV open

 

 

 

3.0

10.0

V

Range (Note 1)

RL = 10kΩ , LV to GND

 

1.5

10

1.5

3.5

 

 

 

IL = 20mA,

TA = +25°C

65

100

55

100

 

 

TA = 0°C to +70°C

 

130

 

120

 

 

fOSC = 5kHz,

 

 

 

 

TA = -40°C to +85°C

 

130

 

140

 

 

LV open

 

 

 

Output Resistance

 

TA = -55°C to +125°C

 

150

 

150

Ω

fOSC = 2.7kHz (ICL7660),

TA = +25°C

 

325

 

250

 

 

 

 

 

fOSC = 1kHz (MAX1044),

TA = 0°C to +70°C

 

325

 

300

 

 

V+ = 2V, IL = 3mA,

TA = -40°C to +85°C

 

325

 

300

 

 

LV to GND

 

 

 

 

 

 

 

TA = -55°C to +125°C

 

400

 

400

 

 

 

 

 

 

Oscillator Frequency

COSC = 1pF,

V+ = 5V

5

 

10

 

kHz

LV to GND (Note 2)

V+ = 2V

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power Efficiency

RL = 5kΩ , TA = +25°C, fOSC 5kHz, LV open

95 98

 

95 98

 

%

Voltage Conversion Efficiency

RL = ∞ , TA = +25°C, LV open

97.0 99.9

 

99.0 99.9

 

%

Oscillator Sink or

VOSC = 0V or V+, LV open

Pin 1 = 0V

 

3

 

 

µA

Source Current

Pin 1 = V+

 

20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Oscillator Impedance

TA = +25°C

V+ = 2V

1.0

 

1.0

 

V+ = 5V

100

 

100

 

 

 

 

 

Note 1: The Maxim ICL7660 and MAX1044 can operate without an external output diode over the full temperature and voltage ranges. The Maxim ICL7660 can also be used with an external output diode in series with pin 5 (cathode at VOUT) when replacing the Intersil ICL7660. Tests are performed without diode in circuit.

Note 2: fOSC is tested with COSC = 100pF to minimize the effects of test fixture capacitance loading. The 1pF frequency is correlated to this 100pF test point, and is intended to simulate pin 7’s capacitance when the device is plugged into a test socket with no external capacitor. For this test, the LV pin is connected to GND for comparison to the original manufacturer’s device, which automatically connects this pin to GND for (V+ > 3V).

2 _______________________________________________________________________________________

Maxim Integrated Producs MAX1044EPA, MAX1044C/D, MAX1044CSA, MAX1044CPA Datasheet

Switched-Capacitor Voltage Converters

__________________________________________Typical Operating Characteristics

(V+ = 5V; CBYPASS = 0.1µF; C1 = C2 = 10µF; LV = open; OSC = open; TA = +25°C; unless otherwise noted.)

OUTPUT VOLTAGE and OUTPUT RIPPLE

OUTPUT VOLTAGE and OUTPUT RIPPLE

OUTPUT VOLTAGE and OUTPUT RIPPLE

vs. LOAD CURRENT

vs. LOAD CURRENT

vs. LOAD CURRENT

OUTPUT VOLTAGE (V)

-2.0

 

 

 

 

 

 

 

 

 

1

400

 

 

-5.0

 

 

 

 

 

 

 

2

800

 

 

-10

 

 

 

 

 

 

 

 

 

 

VOLTAGE

 

 

MAX1044Fig-

350

 

 

-4.5

 

 

OUTPUT VOLTAGE

 

MAX1044Fig-

720

 

 

-9

 

 

 

 

 

 

 

 

 

 

OUTPUT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTPUT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(mVpRIPPLEOUTPUT-p)

 

-4.0

 

 

 

A

 

 

 

 

640

(mVpRIPPLEOUTPUT-p)

 

-8

VOLTAGE

 

 

 

-1.5

 

 

 

 

 

 

 

 

 

 

300

VOLTAGEOUTPUT(V)

A: MAX1044 with

 

 

B

 

 

VOLTAGEOUTPUT(V)

A: MAX1044 with

 

 

A: MAX1044 with

 

 

 

 

 

 

-3.5

 

 

 

 

560

-7

 

 

-0.5

 

 

 

LV = GND

 

100

 

 

 

 

 

 

 

 

 

 

BOOST = V+

 

 

LV = OPEN

 

BOOST = V+

 

 

 

BOOST = V+

 

 

 

 

 

 

 

250

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-3.0

B: ICL7660

 

 

 

 

 

 

480

 

 

-6

B: ICL7660

 

 

 

 

B: ICL7660

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C: MAX1044 with

 

 

 

 

 

 

 

 

 

C: MAX1044 with

 

 

-1.0

C: MAX1044 with

 

 

 

 

 

 

200

 

 

-2.5

 

 

 

C

 

400

 

 

-5

 

 

 

 

 

 

 

 

 

 

BOOST = OPEN

 

 

 

 

 

 

BOOST = OPEN

 

 

 

BOOST = OPEN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

150

 

 

-2.0

 

 

 

 

 

 

 

 

320

 

 

-4

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

OUTPUT

C

 

 

 

 

 

 

 

 

 

V+ = 2V

 

 

 

 

-1.5

 

 

 

 

V+ = 5V

 

 

240

 

 

-3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-1.0

 

 

B

 

 

 

 

 

 

 

 

-2

RIPPLE

 

 

 

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

160

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

50

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-1

 

 

 

 

 

 

 

 

 

A

 

OUTPUT RIPPLE

 

 

-0.5

 

 

A

 

 

 

 

 

80

 

 

 

 

A

 

 

0

 

 

 

 

 

0

 

 

 

 

 

OUTPUT RIPPLE

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

1

2

3

4

5

6

7

8

9

10

 

 

 

0

5

10

15

20

25

30

35

40

 

 

 

0

5

10

15

20

25

 

 

 

 

 

 

-Fig 3

A

 

 

 

 

 

 

B

 

 

MAX1044

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

 

V+ = 10V

LV = OPEN

30 35 40

700

 

630

 

560

-p)

 

490

(mVp

 

420

RIPPLE

350

 

280

OUTPUT

210

 

140

 

70

 

0

 

LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA)

EFFICIENCY and SUPPLY CURRENT

EFFICIENCY and SUPPLY CURRENT

EFFICIENCY and SUPPLY CURRENT

vs. LOAD CURRENT

vs. LOAD CURRENT

vs. LOAD CURRENT

EFFICIENCY (%)

100

 

 

 

 

 

 

 

 

 

4

10

 

 

100

 

 

 

 

 

 

 

5

50

 

 

100

90

EFFICIENCY

 

 

 

 

 

 

MAX1044-Fig

9

 

 

90

EFFICIENCY

 

 

 

 

A

MAX1044-Fig

45

 

 

90

80

 

 

 

 

 

 

 

8

 

 

80

 

 

 

 

 

 

B

 

40

 

 

80

 

 

 

 

 

 

 

 

 

 

CURRENTSUPPLY(mA)

 

A: MAX1044 with

 

 

 

 

CURRENTSUPPLY(mA)

 

70

 

 

 

 

 

 

 

 

 

 

7

 

70

 

 

C

 

 

35

 

70

 

 

 

 

 

 

 

 

 

 

EFFICIENCY(%)

BOOST = V+

 

 

 

 

EFFICIENCY(%)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

60

 

 

 

 

 

 

 

 

 

 

6

60

B: ICL7660

 

 

 

 

 

 

30

60

50

 

 

 

 

 

 

 

 

 

 

5

 

 

50

C: MAX1044 with

 

 

 

 

 

25

 

 

50

 

 

 

 

 

 

 

 

 

 

 

 

BOOST = OPEN

 

 

 

 

 

 

 

40

 

 

 

 

SUPPLY CURRENT

 

4

 

 

40

 

 

 

 

SUPPLY CURRENT

20

 

 

40

30

 

 

 

 

 

 

 

 

 

 

3

 

 

30

 

 

 

 

 

V+ = 5V

 

15

 

 

30

20

 

 

 

 

 

 

 

 

 

 

2

 

 

20

 

 

 

 

 

 

10

 

 

20

 

 

 

 

 

 

V+ = 2V

 

 

 

 

 

 

 

 

LV = OPEN

 

 

 

10

 

 

 

 

 

 

 

1

 

 

10

 

 

 

 

 

 

5

 

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LV = GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

0

 

 

0

 

 

 

 

 

 

 

 

0

 

 

0

0

1

2

3

4

5

6

7

8

9

10

 

 

 

0

5

10

15

20

25

30

35

40

 

 

 

 

B, C

A

-Fig 6

MAX1044

 

EFFICIENCY

 

 

A: MAX1044 with

 

 

BOOST = V+

 

B: ICL7660

 

C: MAX1044 with

 

 

BOOST = OPEN

 

 

 

SUPPLY CURRENT

V+ = 10V

LV = OPEN

0

5

10

15

20

25

30

35

40

50

 

45

 

40

(mA)

35

30

CURRENT

 

25

SUPPLY

20

15

10

5

0

LOAD CURRENT (mA)

LOAD CURRENT (mA)

LOAD CURRENT (mA)

EFFICIENCY

OSCILLATOR FREQUENCY

OSCILLATOR FREQUENCY

vs. OSCILLATOR FREQUENCY

vs. EXTERNAL CAPACITANCE

vs. SUPPLY VOLTAGE

(%)EFFICIENCY

100

100µF=C2C1,

10µF=C2C1,

1µF=C2C1,

 

 

7

100,000

 

 

 

 

8

100,000

 

 

 

 

 

 

 

 

9

90

OSCILLATOR

MAX1044-Fig

(Hz)FREQUENCYOSCILLATOR

10,000

 

 

MAX1044 with

MAX1044-Fig

(Hz)FREQUENCYOSCILLATOR

 

 

 

 

 

 

 

 

MAX1044-Fig

 

 

 

 

 

 

 

 

 

 

BOOST -V+

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

80

 

 

 

 

 

 

 

1000

 

 

 

 

 

10,000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

70

 

 

 

 

 

 

 

100

ICL7660 and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

60

 

 

 

 

 

 

 

MAX1044 with

 

 

 

 

 

FROM TOP TO BOTTOM AT 5V

 

 

 

 

 

 

 

 

 

 

 

BOOST = OPEN

 

 

 

 

 

 

 

 

 

 

 

 

EXTERNAL

 

 

10

 

 

 

 

 

1000

 

MAX1044, BOOST = V+, LV = GND

 

 

50

 

 

 

 

 

 

 

 

 

 

 

MAX1044, BOOST = V+, LV = OPEN

 

 

 

 

 

HCMOS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ICL7660, LV = GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

ICL7660, LV = OPEN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX1044, BOOST = OPEN, LV = GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

30

 

 

 

 

 

 

 

0.1

 

 

 

 

 

100

 

MAX1044, BOOST = OPEN, LV = OPEN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

101

 

102

103

104

105

6x105

 

1

10

100

1000

10,000 100,000

1

2

3

4

5

6

7

8

9

10

 

 

 

OSCILLATOR FREQUENCY (Hz)

 

 

 

 

COSC (pF)

 

 

 

 

 

SUPPLY VOLTAGE (V)

 

 

 

MAX1044/ICL7660

_______________________________________________________________________________________ 3

MAX1044/ICL7660

Switched-Capacitor Voltage Converters

____________________________Typical Operating Characteristics (continued)

(V+ = 5V; CBYPASS = 0.1µF; C1 = C2 = 10µF; LV = open; OSC = open; TA = +25°C; unless otherwise noted.)

 

 

OSCILLATOR FREQUENCY

 

 

 

 

QUIESCENT CURRENT

 

 

 

 

 

vs. TEMPERATURE

 

 

 

 

vs. OSCILLATOR FREQUENCY

 

 

100

 

 

 

 

 

 

10

 

10,000

 

 

 

 

 

11

 

 

 

 

 

A: MAX1044 with

-Fig

 

 

 

 

 

 

 

-Fig

(kHz)FREQUENCYOSCILLATOR

 

 

 

 

MAX1044

(µA)CURRENTQUIESCENT

 

 

 

 

 

 

MAX1044

80

 

 

 

BOOST = V+

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B: ICL7600

 

 

 

1000

 

 

 

 

 

 

 

 

A

 

 

C: MAX1044 with

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

60

 

 

 

BOOST = OPEN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

USING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EXTERNAL

 

 

 

 

 

40

 

 

 

 

 

 

 

 

 

CAPACITOR

 

 

 

 

 

20

 

 

 

 

 

 

 

 

10

 

 

 

USING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EXTERNAL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

HCMOS

 

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

OSCILLATOR

 

 

0

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

-50

-25

0

25

50

75

100

125

 

100

101

102

103

104

105

5x105

 

 

 

TEMPERATURE (°C)

 

 

 

 

OSCILLATOR FREQUENCY (Hz)

 

 

 

 

 

QUIESCENT CURRENT

 

 

 

 

 

QUIESCENT CURRENT

 

 

 

 

 

vs. SUPPLY VOLTAGE

 

 

 

500

 

vs. TEMPERATURE

 

 

 

2000

 

 

 

 

 

 

MAX1044-Fig 12

 

 

 

 

 

 

MAX1044-Fig 13

(µA)

1000

 

 

 

 

 

 

(µA)

400

 

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

 

CURRENT

100

 

 

B

 

 

 

 

CURRENT

300

 

 

 

MAX1044 with

 

 

 

C

 

 

 

 

 

 

 

BOOST = V+

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D

 

 

 

 

 

 

 

 

 

 

 

 

QUIESCENT

10

 

BOOST = OPEN, LV = GND;

 

 

QUIESCENT

200

 

 

 

 

 

 

1

 

 

 

100

 

 

 

 

 

 

 

 

 

A: MAX1044, BOOST = V+, LV = GND

 

 

 

 

 

 

 

 

 

 

 

 

B: MAX1044, BOOST = V+, LV = OPEN

 

 

 

 

 

 

 

 

 

 

 

C: ICL7660 and MAX1044 with

 

 

 

 

 

 

 

 

 

 

 

 

ABOVE 5V, MAX1044 ONLY

 

 

 

 

 

 

 

 

 

 

 

 

 

D: ICL7660 and MAX1044 with

 

 

 

ICL7660, MAX1044 with BOOST = OPEN

 

 

0.1

 

BOOST = OPEN, LV = OPEN

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 2 3 4 5 6 7 8 9 10

-50 -25

0

25 50 75 100 125

SUPPLY VOLTAGE (V)

 

TEMPERATURE (°C)

OUTPUT RESISTANCE

OUTPUT RESISTANCE

OUTPUT RESISTANCE

vs. OSCILLATOR FREQUENCY

vs. SUPPLY VOLTAGE

vs. TEMPERATURE

 

1000

 

 

 

 

14

 

200

 

900

 

 

 

EXTERNAL

-Fig

 

180

 

 

 

 

MAX1044

 

 

 

 

 

HCMOS

 

 

 

 

 

 

 

 

 

800

 

 

 

OSCILLATOR

)

160

 

 

 

 

 

 

 

 

 

 

(Ω

 

700

 

 

 

 

 

140

RESISTANCE (Ω)

 

 

 

 

 

OUTPUT RESISTANCE

600

C1, C2 = 100µF

C1, C2 = 10µF

 

 

 

120

500

C1, C2 = 1µF

 

 

100

400

 

 

80

300

 

 

60

200

 

 

40

 

 

 

 

 

 

 

 

100

 

 

 

 

 

 

20

 

0

 

 

 

 

 

 

0

 

101

 

102

103

104

105

 

 

FREQUENCY (Hz)

 

 

 

 

 

 

 

 

 

15

80

 

 

16

 

 

 

 

 

 

 

 

 

MAX1044-Fig

70

 

 

MAX1044-Fig

 

 

 

 

 

 

 

 

 

)

 

 

 

 

 

 

 

 

 

 

 

 

(Ω

 

 

 

 

 

 

 

 

 

 

 

 

 

RESISTANCE

60

ICL7660,

 

 

 

 

 

 

 

 

 

 

MAX1044 with

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

50

BOOST = OPEN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTPUT

40

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX1044 with

 

 

 

 

 

 

 

 

 

 

30

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BOOST = V+

 

 

 

 

 

 

 

 

 

 

 

 

 

1

2

3

4

5

6

7

8

9

10

20

 

 

 

-60

-40 -20

0

20 40 60 80 100 120 140

 

 

 

SUPPLY VOLTAGE (V)

 

 

 

 

 

TEMPERATURE (°C)

4 _______________________________________________________________________________________

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