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LT1249

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: Current amplifier is in linear mode with 0V input common mode.

Note 3: Multiplier Gain Constant: K =

Note 4: Maximum GTDR output voltage is internally clamped for higher

VCC voltages.

TYPICAL PERFORMANCE CHARACTERISTICS

FREQUENCY (Hz)

100

–20

100

10k

100k

1249 G01

10M

–20

–40

–60

–80

–100

–120

PHASE

GAIN

Voltage Amplifier Open-Loop

Gain and Phase

FREQUENCY (Hz)

400

350

300

250

200

150

100

–20

–40

–60

–80

–100

–120

–140

100k

10k

1249 G02

10M

Transconductance of

Current Amplifier

IAC (VAOUT – 1.5)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Reference

Reference Output Voltage

TA = 25°C, Measured at VSENSE Pin

7.39

7.5

7.6

Reference Output Voltage Worst Case

All Line, Temperature

7.32

7.5

7.68

Reference Output Voltage Line Regulation

VLOCKOUT < VCC < VMAX

–20

Multiplier

Multiplier Output Current

IAC = 100µA, VAOUT = 5V

µA

Multiplier Output Current Offset

RAC = 1M from IAC to GND

– 0.05

– 0.5

µA

Multiplier Max Output Current (IM(MAX))IAC = 450µA, VAOUT = 7V (Note 2)

– 375

– 250

– 150

µA

Multiplier Max Output Voltage (IM(MAX) • RMOUT)IAC = 450µA, VAOUT = 7V (Note 2)

– 1.25

– 1.1

– 0.96

Multiplier Gain Constant (Note 3)

0.035

V–2

IAC Input Resistance

IAC from 50µA to 1mA

Ω

Oscillator

Oscillator Frequency

100

125

kHz

Control Pin (CAOUT) Threshold

Duty Cycle = 0

1.3

1.8

2.3

Synchronization Frequency Range

Synchronizing Pulse Low

≤ 0.35V on CAOUT

127

160

kHz

Gate Driver

Max GTDR Output Voltage

0mA Load, 18V < VCC < VMAX (Note 4)

17.5

GTDR Output High

– 200mA Load, 11.5V

≤ VCC ≤ 15V

VCC – 3.0

GTDR Output Low (Device Unpowered)

VCC = 0V, 50mA Load (Sinking)

0.9

1.5

GTDR Output Low (Device Active)

200mA Load (Sinking)

0.5

Peak GTDR Current

10nF from GTDR to GND

GTDR Rise and Fall Time

1nF from GTDR to GND

GTDR Max Duty Cycle

ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the operating temperature

range, otherwise specifications are at TA = 25°C. Maximum operating voltage (VMAX) = 25V, VCC = 18V, IAC = 100µA, CAOUT = 3.5V,

VAOUT = 5V, no load on any outputs, unless otherwise noted.

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