LT1469
Dual 90MHz, 22V/µs
16-Bit Accurate Operational Amplifier
FEATURES
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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 and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
90MHz Gain Bandwidth, f = 100kHz
Maximum Input Offset Voltage: 125μV
Settling Time: 900ns (A
V
= –1, 150μV, 10V Step)
22V/μs Slew Rate
Low Distortion: –96.5dB for 100kHz, 10V
P-P
Maximum Input Offset Voltage Drift: 3μV/°C
Maximum Inverting Input Bias Current: 10nA
Minimum DC Gain: 300V/mV
Minimum Output Swing into 2k: ±12.8V
Unity-Gain Stable
Input Noise Voltage: 5nV/√Hz
Input Noise Current: 0.6pA/√Hz
Total Input Noise Optimized for 1kΩ < R
S
< 20kΩ
Specified at ±5V and ±15V Supplies
APPLICATIONS
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Precision Instrumentation
High Accuracy Data Acquisition Systems
16-Bit DAC Current-to-Voltage Converter
ADC Buffer
Low Distortion Active Filters
Photodiode Amplifiers
TYPICAL APPLICATION
16-Bit DAC I-to-V Converter and Reference Inverter for Bipolar Output Swing (V
OUT
= –10V to 10V)
15V
V
REF
Bipolar Multiplying Mode (LTC1597)
Signal-to-(Noise + Distortion)
40
SIGNAL/(NOISE + DISTORTION) (dB)
50
60
70
80
500kHz FILTER
90
100
110
10
–15V
1469 TA01
+
1/2 LT1469
–
15pF
2.4μs SETTLING TIME
TO 1LSB ON 20V STEP
DAC INPUT CODE = ALL ZEROS
V
REF
= 20V
P-P
15pF
12k
16 BITS
DAC INPUTS
12k
LTC1597
12k
12k
+
–
1/2 LT1469
R
LPF
V
OUT
C
LPF
80kHz FILTER
30kHz
FILTER
100
1k
10k
FREQUENCY (Hz)
100k
1469 TA01a
1469fa
1
LINER [ LINEAR TECHNOLOGY ]
