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LT1204

HARA TERISTICS

TYPICALPERFOR

Disabled and Shutdown Supply

Current vs Supply Voltage

Settling Time to 1mV

vs Output Step

Enabled Supply Current

vs Supply Voltage

SETTLING TIME (

µs)

1205 G25

–2

–6

–10

–4

–8

VS = ±15V

RF = RG = 1k

218

SUPPLY VOLTAGE (

±V)

1204 G26

°C

125

°C

–55

°C

SUPPLY VOLTAGE (

±V)

1204 G27

°C

125

°C

–55

°C

–55

°C, 25°C, 125°C

ISHDN

APPLICATI

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 RG) 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 600

µV per volt of supply

mismatch. The inverting bias current changes about 2.5

µA

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, AV = 2

1204 AI01

VS = ±15V

RL = 150Ω

RF = 1k

RG = 1k

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