LT1256CS datasheet(4/24 Pages) LINER

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LT1251/LT1256

SIG AL A PLIFIER DC CHARACTERISTICS

°C ≤ TA ≤ 70°C, VS = ±5V, VCM = 0V, VFS = 2.5V, IC = IFS = NULL = Open, Pins 5,10 = GND, unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

AVOL

Large-Signal Voltage Gain

VO = – 3V to 3V, RL = 150Ω

VO = – 2.75V to 2.75V, RL = 150Ω

ROL

Transresistance,

∆VOUT/∆IIN–

VO = – 3V to 3V, RL = 150Ω

0.75

1.8

Ω

VO = – 2.75V to 2.75V, RL = 150Ω

0.75

Ω

VOUT

Maximum Output Voltage Swing

No Load

±4.0

±4.2

RL = 150Ω

±3.0

±3.5

±2.75

VS = ±15V, No Load

±14.0

±14.2

VS = 5V, VCM = 2.5V, (Note 6)

1.2

3.8

Maximum Output Current

VS = ±5V

±30

±40

VS = 5V, VCM = VO = 2.5V

±20

±30

Supply Current

VC = VFS = 2.5V

13.5

17.0

VC = VFS = 1.25V

7.5

9.5

VC = VFS = 0V

1.3

1.8

VC = VFS = 2.5V, VS = ±15V

14.5

18.5

VC = VFS = 0V, VS = ±15V

1.4

2.0

CO TROL A D FULL SCALE A PLIFIER CHARACTERISTICS

°C ≤ TA ≤ 70°C, VS = ±5V, VFS = 2.5V, IC = IFS = NULL = Open, Pins 5,10 = GND, unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Control Amplifier Input Offset Voltage

Pin 4 to Pin 3

515

Full-Scale Amplifier Input Offset Voltage

Pin 11 to Pin 12

515

Control Amplifier Input Resistance

100

Ω

Full-Scale Amplifier Input Resistance

100

Ω

Control Amplifier Input Bias Current

– 750

– 300

Full-Scale Amplifier Input Bias Current

– 750

– 300

Internal Control Resistor

TA = 25°C

3.75

6.25

Ω

RFS

Internal Full-Scale Resistor

TA = 25°C

456

Ω

Resistor Temperature Coefficient

0.2

°C

Control Path Bandwidth

Small Signal, VC = 100mV, (Note 7)

MHz

Control Path Rise and Fall Time

Small Signal, VC = 100mV, (Note 7)

Control Path Transition Time

0% to 100%

150

Control Path Propagation Delay

Small Signal,

∆VC = 100mV

VC from 0% or 100%

The q denotes specifications which apply over the specified operating

temperature range.

Note 1: A heat sink may be required depending on the power supply

voltage.

Note 2: Commercial grade parts are designed to operate over the

temperature range of – 40

°C to 85°C but are neither tested nor guaranteed

beyond 0

°C to 70°C. Industrial grade parts specified and tested over

–40

°C to 85°C are available on special request. Consult factory.

Note 3: TJ is calculated from the ambient temperature TA and the power

dissipation PD according to the following formulas:

LT1251CN/LT1256CN:

TJ = TA + (PD • 70°C/W)

LT1251CS/LT1256CS:

TJ = TA + (PD • 100°C/W)

Note 4: Differential gain and phase are measured using a Tektronix

TSG120YC/NTSC signal generator and a Tektronix 1780R Video

Measurement Set. The resolution of this equipment is 0.1% and 0.1

°. Five

identical amplifier stages were cascaded giving an effective resolution of

0.02% and 0.02

°.

Note 5: Differential gain and phase are best when the control is set at 0%

or 100%. See the Typical Performance Characteristics curves.

Note 6: Tested with RL = 150Ω to 2.5V to simulate an AC coupled load.

Note 7: Small-signal control path response is measured driving RC (Pin 5)

to eliminate peaking caused by stray capacitance on Pin 4.

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