9
LT1204
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
Disabled and Shutdown Supply
Current vs Supply Voltage
Settling Time to 1mV
vs Output Step
Enabled Supply Current
vs Supply Voltage
SETTLING TIME (µs)
0
OUTPUT STEP (V)
2
6
10
16
1205 G25
–2
–6
–10
4
8
12
20
0
4
8
–4
–8
V
S
= ±15V
R
F
= R
G
= 1k
218
6
10
14
SUPPLY VOLTAGE (±V)
0
12
SUPPLY CURRENT (mA)
13
15
16
17
22
19
4
8
10 18
1204 G26
14
20
21
18
26
12
14
16
25°C
125°C
–55°C
SUPPLY VOLTAGE (±V)
0
0
SUPPLY CURRENT (mA)
1
15
16
17
22
19
4
8
10 18
1204 G27
2
20
21
18
26
12
14
16
25°C
125°C
–55°C
–55°C, 25°C, 125°C
I
SHDN
U
S
A
O
PP
L
IC
AT
I
WU
U
I FOR ATIO
specified over a very wide range of conditions. An advan-
tage of the current feedback topology used in the LT1204
is well-controlled frequency response. In all cases of the
performance table, the peaking is 0.1dB or less. If more
peaking can be tolerated, larger bandwidths can be
obtained by lowering the feedback resistor. For gains of
2 or less, the 0.1dB bandwidth is greater than 30MHz for
all loads and supply voltages.
At high gains (low values of R
G
) the disabled output
resistance drops slightly due to loading of the internal
buffer amplifier as discussed in Multiplexer Expansion.
Logic Inputs
The logic inputs of the LT1204 are compatible with all 5V
logic. All pins have ESD protection (>2kV), and shorting
them to 12V or 15V will cause excessive currents to flow.
Limit the current to less than 50mA when driving the logic
above 6V.
Power Supplies
The LT1204 will operate from ±5V (10V total) to ±15V
(30V total) and is specified over this range. It is not
necessary to use equal value supplies, however, the offset
voltage and inverting input bias current will change. The
offset voltage changes about 600µV per volt of supply
mismatch. The inverting bias current changes about 2.5µA
per volt of supply mismatch. The power supplies should
be bypassed with quality tantalum capacitors.
Feedback Resistor Selection
The small-signal bandwidth of the LT1204 is set by the
external feedback resistors and internal junction capaci-
tors. As a result the bandwidth is a function of the supply
voltage, the value of the feedback resistor, the closed-
loop gain and the load resistor. These effects are outlined
in the resistor selection guide of the Typical AC Perfor-
mance table. Bandwidths range as high as 95MHz and are
Small-Signal Rise Time, A
V
= 2
1204 AI01
V
S
= ±15V
R
L
= 150Ω
R
F
= 1k
R
G
= 1k
