Datasheet

4
LT1228
1228fc
I
B
Input Bias Current T
A
= 25°C 0.4 1 µA
● 5 µA
e
n
Input Noise Voltage Density f = 1kHz 20 nV/√Hz
R
IN
Input Resistance-Differential Mode V
IN
≈ ±30mV ● 30 200 kΩ
Input Resistance-Common Mode V
S
= ±15V, V
CM
= ±12V ● 50 1000 MΩ
V
S
= ±5V, V
CM
= ± 2V ● 50 1000 MΩ
C
IN
Input Capacitance 3pF
Input Voltage Range V
S
= ±15V, T
A
= 25°C ±13 ±14 V
V
S
= ±15V ● ±12 V
V
S
= ±5V, T
A
= 25°C ±3 ±4V
V
S
= ±5V ● ±2V
CMRR Common Mode Rejection Ratio V
S
= ±15V, V
CM
= ±13V, T
A
= 25°C 60 100 dB
V
S
= ±15V, V
CM
= ±12V ● 60 dB
V
S
= ±5V, V
CM
= ±3V, T
A
= 25°C 60 100 dB
V
S
= ±5V, V
CM
= ±2V ● 60 dB
PSRR Power Supply Rejection Ratio V
S
= ±2V to ±15V, T
A
= 25°C 60 100 dB
V
S
= ±3V to ±15V ● 60 dB
g
m
Transconductance I
SET
= 100µA, I
OUT
= ±30µA, T
A
= 25°C 0.75 1.00 1.25 µA/mV
Transconductance Drift ● –0.33 %/°C
I
OUT
Maximum Output Current I
SET
= 100µA ● 70 100 130 µA
I
OL
Output Leakage Current I
SET
= 0µA (+I
IN
of CFA), T
A
= 25°C 0.3 3 µA
● 10 µA
V
OUT
Maximum Output Voltage Swing V
S
= ±15V , R1 = ∞ ● ±13 ±14 V
V
S
= ±5V , R1 = ∞ ● ±3 ±4V
R
O
Output Resistance V
S
= ±15V, V
OUT
= ±13V ● 28 MΩ
V
S
= ±5V, V
OUT
= ±3V ● 28 MΩ
Output Capacitance (Note 3) V
S
= ±5V 6 pF
I
S
Supply Current, Both Amps I
SET
= 1mA ● 915 mA
THD Total Harmonic Distortion V
IN
= 30mV
RMS
at 1kHz, R1 = 100k 0.2 %
BW Small-Signal Bandwidth R1 = 50Ω, I
SET
= 500µA 80 MHz
t
r
Small-Signal Rise Time R1 = 50Ω, I
SET
= 500µA, 10% to 90% 5 ns
Propagation Delay R1 = 50Ω, I
SET
= 500µA, 50% to 50% 5 ns
E
LECTR
IC
AL C CHARA TERIST
ICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
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 R
F
= 1k, R
G
= 110Ω and R
L
= 400Ω. The
slew rate is much higher when the input is overdriven, see the applications
section.
Note 5: Rise time is measured from 10% to 90% on a ±500mV output
signal while operating on ±15V supplies with R
F
= 1k, R
G
= 110Ω and
R
L
= 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.
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. Transconductance Amplifier, Pins 1, 2, 3, 5. ±5V ≤ V
S
≤ ±15V, I
SET
=
100µA, V
CM
= 0V unless otherwise noted.