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LT1228

1228fd

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. Transconductance Amplifier, Pins 1, 2, 3, 5. ±5V ≤ VS ≤ ±15V,

ISET = 100µA, VCM = 0V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VOS

Input Offset Voltage

ISET = 1mA, TA = 25°C

±0.5

±5

±10

Input Offset Voltage Drift

µV/°C

IOS

Input Offset Current

TA = 25°C

200

500

Input Bias Current

TA = 25°C

0.4

µA

Input Noise Voltage Density

f = 1kHz

nV/√Hz

RIN

Input Resistance-Differential Mode

VIN ≈ ±30mV

200

kΩ

Input Resistance-Common Mode

VS = ±15V, VCM = ±12V

VS = ±5V, VCM = ±2V

1000

MΩ

MΩ

CIN

Input Capacitance

Input Voltage Range

VS = ±15V, TA = 25°C

VS = ±15V

±13

±12

±14

VS = ±5V, TA = 25°C

VS = ±5V

±3

±2

±4

CMRR

Common Mode Rejection Ratio

VS = ±15V, VCM = ±13V, TA = 25°C

VS = ±15V, VCM = ±12V

100

VS = ±5V, VCM = ±3V, TA = 25°C

VS = ±5V, VCM = ±2V

100

PSRR

Power Supply Rejection Ratio

VS = ±2V to ±15V, TA = 25°C

VS = ±3V to ±15V

100

Transconductance

ISET = 100µA, IOUT = ±30µA, TA = 25°C

0.75

1.00

1.25

µA/mV

Transconductance Drift

–0.33

%/°C

IOUT

Maximum Output Current

ISET = 100µA

100

130

µA

IOL

Output Leakage Current

ISET = 0µA (+IIN of CFA), TA = 25°C

0.3

µA

VOUT

Maximum Output Voltage Swing

VS = ±15V , R1 = ∞

VS = ±5V , R1 = ∞

±13

±3

±14

±4

Output Resistance

VS = ±15V, VOUT = ±13V

VS = ±5V, VOUT = ±3V

MΩ

Output Capacitance (Note 3)

VS = ±5V

Supply Current, Both Amps

ISET = 1mA

THD

Total Harmonic Distortion

VIN = 30mVRMS at 1kHz, R1 = 100k

0.2

Small-Signal Bandwidth

R1 = 50Ω, ISET = 500µA

MHz

Small-Signal Rise Time

R1 = 50Ω, ISET = 500µA, 10% to 90%

Propagation Delay

R1 = 50Ω, ISET = 500µA, 50% to 50%

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: A heat sink may be required depending on the power supply voltage.

Note 3: This is the total capacitance at Pin 1. It includes the input capacitance

of the current feedback amplifier and the output capacitance of the

transconductance amplifier.

Note 4: Slew rate is measured at ±5V on a ±10V output signal while operating

on ±15V supplies with RF = 1k, RG = 110Ω and RL = 400Ω. The slew rate is

much higher when the input is overdriven, see the Applications Information

section.

Note 5: Rise time is measured from 10% to 90% on a ±500mV output signal

while operating on ±15V supplies with RF = 1k, RG = 110Ω and RL = 100Ω.

This condition is not the fastest possible, however, it does guarantee the

internal capacitances are correct and it makes automatic testing practical.

Note 6: AC parameters are 100% tested on the ceramic and plastic DIP

packaged parts (J and N suffix) and are sample tested on every lot of the SO

packaged parts (S suffix).

Note 7: NTSC composite video with an output level of 2V.

Note 8: Back to back 6V Zener diodes are connected between Pins 2 and 3

for ESD protection.

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