LT1228
4
1228fd
ELECTRICAL CHARACTERISTICS The
l
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 = 100A, VCM = 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VOS
Input Offset Voltage
ISET = 1mA, TA = 25°C
l
±0.5
±5
±10
mV
Input Offset Voltage Drift
l
10
V/°C
IOS
Input Offset Current
TA = 25°C
l
40
200
500
nA
IB
Input Bias Current
TA = 25°C
l
0.4
1
5
A
en
Input Noise Voltage Density
f = 1kHz
20
nV/√Hz
RIN
Input Resistance-Differential Mode
VIN ≈ ±30mV
l
30
200
k
Input Resistance-Common Mode
VS = ±15V, VCM = ±12V
VS = ±5V, VCM = ±2V
l
50
1000
M
MΩ
CIN
Input Capacitance
3
pF
Input Voltage Range
VS = ±15V, TA = 25°C
VS = ±15V
l
±13
±12
±14
V
VS = ±5V, TA = 25°C
VS = ±5V
l
±3
±2
±4
V
CMRR
Common Mode Rejection Ratio
VS = ±15V, VCM = ±13V, TA = 25°C
VS = ±15V, VCM = ±12V
l
60
100
dB
VS = ±5V, VCM = ±3V, TA = 25°C
VS = ±5V, VCM = ±2V
l
60
100
dB
PSRR
Power Supply Rejection Ratio
VS = ±2V to ±15V, TA = 25°C
VS = ±3V to ±15V
l
60
100
dB
gm
Transconductance
ISET = 100A, IOUT = ±30A, TA = 25°C
0.75
1.00
1.25
A/mV
Transconductance Drift
l
–0.33
%/°C
IOUT
Maximum Output Current
ISET = 100A
l
70
100
130
A
IOL
Output Leakage Current
ISET = 0A (+IIN of CFA), TA = 25°C
l
0.3
3
10
A
VOUT
Maximum Output Voltage Swing
VS = ±15V , R1 = ∞
VS = ±5V , R1 = ∞
l
±13
±3
±14
±4
V
RO
Output Resistance
VS = ±15V, VOUT = ±13V
VS = ±5V, VOUT = ±3V
l
2
8
MΩ
Output Capacitance (Note 3)
VS = ±5V
6
pF
IS
Supply Current, Both Amps
ISET = 1mA
l
9
15
mA
THD
Total Harmonic Distortion
VIN = 30mVRMS at 1kHz, R1 = 100k
0.2
%
BW
Small-Signal Bandwidth
R1 = 50, ISET = 500A
80
MHz
tr
Small-Signal Rise Time
R1 = 50, ISET = 500A, 10% to 90%
5
ns
Propagation Delay
R1 = 50, ISET = 500A, 50% to 50%
5
ns
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 = 110 and RL = 400. 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 = 110 and RL = 100.
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.