3

LTC1340

ELECTRICAL CHARACTERISTICS

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Charge Pump Start-Up Time

q

1.2

5

ms

200

Charge Pump Frequency

(Note 3)

q

2.5

4

MHz

range.

Note 1: C grade device specifications are guaranteed over the 0

°C to 70°C

temperature range. In addition, C grade device specifications are assured

over the – 40

°C to 85°C temperature range by design or correlation, but

are not production tested.

9.4

9.3

9.2

9.1

9.0

8.9

4.9

4.8

4.7

4.6

4.5

4.4

1340 G04

TEMPERATURE (

°C)

–50

0

–25

25

50

75

100

125

Output High Voltage vs

Temperature

0.5

0.4

0.3

0.2

0.1

0

1340 G05

TEMPERATURE (

°C)

–50

0

–25

25

50

75

100

125

SUPPLY VOLTAGE (V)

2.5

3.5

3.0

4.5

4.0

5.5

6.0

5.0

6.5

1340 G06

2100

2050

2000

1950

1900

1850

1800

DC Transfer Curve

INPUT VOLTAGE (V)

0

12

11

10

9

8

7

6

5

4

3

2

1

0

1

23

4

1340 G01

56

TEMPERATURE (

°C)

–50

0

0.60

0.55

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

1340 G03

–25

25

50

75

100

125

FREQUENCY (kHz)

1

20

10

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

180

144

108

72

36

0

–36

–72

–108

–144

–180

–216

10

100

1000

1340 G02

PHASE

GAIN

Gain and Phase Shift vs

Frequency

Input Offset Voltage vs

Temperature

Output Low Voltage vs

Temperature

Transconductance vs

Supply Voltage

Note 2: The charge pump output ripple is not tested but is correlated with

a PCB ground plane and high quality, low ESR, low ESL metalized

polyester 0.1

µF capacitors.

Note 3: The internal oscillator typically runs at 2MHz, but the charge pump

refreshes the output on both phases of the clock, resulting in an effective

4MHz operating frequency.