LT1469_15 Datasheet, PDF (1/20 Pages) Linear Technology – Dual 90MHz, 22V/s 16-Bit Accurate Operational Amplifier

LT1469
Dual 90MHz, 22V/µs
16-Bit Accurate Operational Amplifier
FEATURES
n _{90MHz Gain Bandwidth, f = 100kHz}
n _{Maximum Input Offset Voltage: 125µV}
n _{Settling Time: 900ns (AV = –1, 150µV, 10V Step)}
n _{22V/µs Slew Rate}
n _{Low Distortion: –96.5dB for 100kHz, 10VP-P}
n _{Maximum Input Offset Voltage Drift: 3µV/°C}
n _{Maximum Inverting Input Bias Current: 10nA}
n _{Minimum DC Gain: 300V/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 1kΩ < RS < 20kΩ}
n _{Specified at ±5V and ±15V Supplies}
APPLICATIONS
n _{Precision Instrumentation}
n _{High Accuracy Data Acquisition Systems}
n _{16-Bit DAC Current-to-Voltage Converter}
n _{ADC Buffer}
n _{Low Distortion Active Filters}
n _{Photodiode Amplifiers}
DESCRIPTION
The LT^®1469 is a dual, precision high speed operational
amplifier with 16-bit accuracy and 900ns settling to 150µV
for 10V steps. This unique blend of precision and AC
performance makes the LT1469 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 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 LT1469 improves large signal
performance compared to other precision op amps in
applications such as active filters and instrumentation
amplifiers.
The LT1469 is available in a space saving 4mm × 4mm
leadless package, as well as in small outline and DIP pack-
ages. A single version, the LT1468, is also available.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
V_REF
16 BITS
DAC INPUTS
16-Bit DAC I-to-V Converter and Reference Inverter for Bipolar Output Swing (V_OUT = –10V to 10V)
15V
Bipolar Multiplying Mode (LTC1597)
Signal-to-(Noise + Distortion)
+
1/2 LT1469
–
15pF
2.4µs SETTLING TIME
TO 1LSB ON 20V STEP
40
DAC INPUT CODE = ALL ZEROS
50 V_REF = 20V_P-P
60
12k 12k
LTC1597
12k 12k
15pF
–
1/2 LT1469
+
–15V
R_LPF
V_OUT
C_LPF
1469 TA01
70
80
90
100
110
10
500kHz FILTER
80kHz FILTER
30kHz
FILTER
100
1k
10k
100k
FREQUENCY (Hz)
1469 TA01a
1469fb
1