LTC6990

3

Rev. D

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ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

fOUT

Output Frequency

Recommended Range: RSET = 50k to 800k

Extended Range: RSET = 25k to 800k

0.488

0.488

1000

2000

kHz

kHz

∆fOUT

Frequency Accuracy (Note 4)

Recommended Range

RSET = 50k to 800k

l

±0.8

±1.5

±2.2

%

%

Extended Range

RSET = 25k to 800k

l

±2.4

±3.2

%

%

∆fOUT/∆T

Frequency Drift Over Temperature

l

±0.005

%/°C

∆fOUT/∆V+

Frequency Drift Over Supply

V+ = 4.5V to 5.5V

V+ = 2.25V to 4.5V

l

l

0.23

0.06

0.55

0.16

%/V

%/V

Long-Term Frequency Stability

(Note 11)

90

ppm/√kHr

Period Jitter (Note 10)

NDIV = 1

0.38

%P-P

NDIV = 2

0.22

0.027

%P-P

%RMS

NDIV = 128

0.022

0.004

%P-P

%RMS

Duty Cycle

NDIV = 1, RSET = 25k to 800k

NDIV > 1, RSET = 25k to 800k

l

l

47

48

50

50

53

52

%

%

BW

Frequency Modulation Bandwidth

0.4•fOUT

kHz

tS

Frequency Change Settling Time

(Note 9)

tMASTER = tOUT/NDIV

6•tMASTER

µs

Analog Inputs

VSET

Voltage at SET Pin

l

0.97

1.00

1.03

V

∆VSET/∆T

VSET Drift Over Temperature

l

±75

µV/°C

∆VSET/∆V+

VSET Drift Over Supply

–150

µV/V

∆VSET/∆ISET VSET Droop with ISET

–7

Ω

RSET

Frequency-Setting Resistor

Recommended Range

Extended Range

l

l

50

25

800

800

kΩ

kΩ

VDIV

DIV Pin Voltage

l

0

V+

V

∆VDIV/V+

DIV Pin Valid Code Range (Note 5) Deviation from Ideal VDIV/V+ = (DIVCODE + 0.5)/16 l

±1.5

%

DIV Pin Input Current

l

±10

nA

Power Supply

V+

Operating Supply Voltage Range

l

2.25

5.5

V

Power-On Reset Voltage

RSET = 25k to 800k

l

1.95

V

IS

Supply Current

RL = ∞, NDIV = 1, RSET = 50k

V+ = 5.5V

V+ = 2.25V

l

l

235

145

283

183

µA

µA

RL = ∞, NDIV = 1 RSET = 800k

V+ = 5.5V

V+ = 2.25V

l

l

71

59

105

92

µA

µA

RL = ∞, NDIV = 128, RSET = 50k

V+ = 5.5V

V+ = 2.25V

l

l

137

106

180

145

µA

µA

RL = ∞, NDIV = 128, RSET = 800k

V+ = 5.5V

V+ = 2.25V

l

l

66

56

100

90

µA

µA

The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. Test conditions are V+ = 2.25V to 5.5V, OE = V+, DIVCODE = 0 to 15

(NDIV = 1 to 128), RSET = 50k to 800k, RLOAD = 5k, CLOAD = 5pF unless otherwise noted.