LTC1758-2 データシートの表示（PDF） - Linear Technology

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LTC1758-2

RF Power Controllers with 250kHz Control Loop Bandwidth and 40dB Dynamic Range

Linear Technology 

LTC1758-1/LTC1758-2

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

temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, SHDN = TXEN = VIN, unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP

MAX

SHDN, TXEN, BSEL Input Current

SHDN, TXEN or BSEL = 3.6V

q 10

25

50

PCTL Input Voltage Control Range

PCTL Input Voltage Range

PCTL Input Resistance

VIN = 3V to 6V, RLOAD = 400Ω

VIN = 3V, RLOAD = 400Ω (Note 7)

SHDN = LO, TXEN = LO

q0

q

q 50

2

2.4

90

140

PCTL Input Filter

350

Autozero Range

VIN = 2.7V, RLOAD = 400Ω (Note 4)

q

400

Autozero Settling Time (tS)

tS, Shutdown to Enable (Autozero), VIN = 2.7V (Note 10) q

50

RF Input Frequency Range

(Note 6)

q 850

2000

RF Input Power Range

900MHz (Note 6)

1800MHz (Note 6)

– 26

16

– 24

16

RF Input Impedance

BSEL Timing

Referenced to VIN, SHDN = LO, TXEN = LO

t1, Setup Time Prior to TXEN Asserted High

t2, Hold Time After TXEN is Asserted Low

q 100

200

350

200

200

UNITS

µA

V

V

kΩ

kHz

mV

µs

MHz

dBm

dBm

Ω

ns

ns

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

of a device may be impaired.

Note 2: The LTC1758-1 and LTC1758-2 are guaranteed to meet

performance specifications from 0°C to 70°C. Specifications over the

– 30°C to 85°C operating temperature range are assured by design,

characterization and correlation with statistical process controls.

Note 3: Slew rate is measured open loop. The slew time at VPCA or VPCB is

measured between 1V and 2V.

Note 4: Maximum DAC zero-scale offset voltage that can be applied to

PCTL.

Note 5: This is the time from TXEN rising edge 50% switch point to

VPCA/B = 1V.

Note 6: Guaranteed by design. This parameter is not production tested.

Note 7: Includes maximum DAC offset voltage and maximum control

voltage.

Note 8: Bandwidth is calculated using the 10% to 90% rise time:

BW = 0.35/rise time

Note 9: Measured 1µs after TXEN = HI.

Note 10: 50% switch point, SHDN HI = VIN, TXEN HI = VIN.

TYPICAL PERFOR A CE CHARACTERISTICS

RF Detector Characteristics

at 900MHz

10000

VIN = 3V TO 4.4V

1000

100

–30°C

10

75°C

25°C

1

–26 –20 –14 –8 –2 4

RF INPUT POWER (dBm)

10 16

1758 G01

RF Detector Characteristics

at 1800MHz

10000

VIN = 3V TO 4.4V

1000

100

–30°C

10

25°C

75°C

1

–24 –20 –16 –12 –8 –4 0 4 8

RF INPUT POWER (dBm)

12 16

1758 G02

3

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