LT1468_1 Datasheet, PDF (1/16 Pages) Linear Technology – 90MHz, 22V/μs 16-Bit Accurate Operational Amplifi er

FEATURES
n _{90MHz Gain Bandwidth, f = 100kHz}
n _{22V/μs Slew Rate}
n _{Settling Time: 900ns (AV = –1, 150μV, 10V Step)}
n _{Low Distortion, – 96.5dB for 100kHz, 10VP-P}
n _{Maximum Input Offset Voltage: 75μV}
n _{Maximum Input Offset Voltage Drift: 2μV/°C}
n _{Maximum (–) Input Bias Current: 10nA}
n _{Minimum DC Gain: 1000V/mV}
n _{Minimum Output Swing into 2k: ±12.8V}
n _{Unity Gain Stable}
n _{Input Noise Voltage: 5nV/√Hz}
n _{Input Noise Current: 0.6pA/√Hz}
n _{Total Input Noise Optimized for 1k < RS < 20k}
n _{Specified at ±5V and ±15V}
APPLICATIONS
n _{16-Bit DAC Current-to-Voltage Converter}
n _{Precision Instrumentation}
n _{ADC Buffer}
n _{Low Distortion Active Filters}
n _{High Accuracy Data Acquisition Systems}
n _{Photodiode Amplifiers}
LT1468
90MHz, 22V/µs
16-Bit Accurate
Operational Amplifier
DESCRIPTION
The LT^®1468 is a precision high speed operational amplifier
with 16-bit accuracy and 900ns settling to 150μV for 10V
signals. This unique blend of precision and AC performance
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 character-
istics 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 ap-
plications 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 a complementary bipolar
process. It is available in a space saving 3mm × 3mm lead-
less package, as well as small outline and DIP packages.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
16-Bit DAC I-to-V Converter
DAC ¹⁶
INPUTS
6k
LTC^®1597
20pF
–
LT1468
+
2k
V_OUT
50pF
OFFSET: V_OS + I_B (6kΩ) < 1LSB
SETTLING TIME TO 150μV = 1.7μs
OPTIONAL NOISE FILTER
SETTLING LIMITED BY 6k AND 20pF TO COMPENSATE DAC OUTPUT CAPACITANCE
1468 TA01
Total Harmonic Distortion vs Frequency
–80
V_S = ±15V
A_V = 2
–90
R_L = 2k
V_OUT = 10V_P-P
–100
–110
–120
–130
100
1k
10k
FREQUENCY (Hz)
100k
1468 TA02
1468fa
1