FEATURES
s 90MHz Gain Bandwidth, f = 100kHz
s 22V/µs Slew Rate
s Settling Time: 900ns (AV = –1, 150µV, 10V Step)
s Low Distortion, – 96.5dB for 100kHz, 10VP-P
s Maximum Input Offset Voltage: 75µV
s Maximum Input Offset Voltage Drift: 2µV/°C
s Maximum (–) Input Bias Current: 10nA
s Minimum DC Gain: 1000V/mV
s Minimum Output Swing into 2k: ±12.8V
s Unity Gain Stable
s Input Noise Voltage: 5nV/√Hz
s Input Noise Current: 0.6pA/√Hz
s Total Input Noise Optimized for 1k < RS < 20k
s Specified at ±5V and ±15V
U
APPLICATIONS
s 16-Bit DAC Current-to-Voltage Converter
s Precision Instrumentation
s ADC Buffer
s Low Distortion Active Filters
s High Accuracy Data Acquisition Systems
s Photodiode Amplifiers
LT1468
90MHz, 22V/µs
16-Bit Accurate
Operational Amplifier
DESCRIPTIO
The LT®1468 is a precision high speed operational ampli-
fier with 16-bit accuracy and 900ns settling to 150µV for
10V signals. This unique blend of precision and AC perfor-
mance makes the LT1468 the optimum choice for high
accuracy applications such as DAC current-to-voltage
conversion and ADC buffers. The initial accuracy and drift
characteristics of the input offset voltage and inverting
input bias current are tailored for inverting applications.
The 90MHz gain bandwidth ensures high open-loop gain
at frequency for reducing distortion. In noninverting appli-
cations such as an ADC buffer, the low distortion and DC
accuracy allow full 16-bit AC and DC performance.
The 22V/µs slew rate of the LT1468 improves large-signal
performance in applications such as active filters and
instrumentation amplifiers compared to other precision
op amps.
The LT1468 is manufactured on Linear Technology’s
complementary bipolar process.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
16-Bit DAC I-to-V Converter
DAC 16
INPUTS
6k
LTC ®1597
20pF
–
LT1468
+
2k
VOUT
50pF
OFFSET: VOS + IB (6kΩ) < 1LSB
OPTIONAL NOISE FILTER
SETTLING TIME TO 150µV = 1.7µs
SETTLING LIMITED BY 6k AND 20pF TO COMPENSATE DAC OUTPUT CAPACITANCE
1468 TA01
Total Harmonic Distortion vs Frequency
– 80
VS = ±15V
AV = 2
– 90
RL = 2k
VOUT = 10VP-P
– 100
– 110
– 120
– 130
100
1k 10k
FREQUENCY (Hz)
100k
1468 TA02
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