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LT6236 Datasheet, PDF (1/24 Pages) Linear Technology – Rail-to-Rail Output 215MHz, 1.1nV/√Hz Op Amp/SAR ADC Driver
FEATURES
n Low Noise: 1.1nV/√Hz
n Low Supply Current: 3.5mA/Amp Max
n Low Offset Voltage: 350μV Max
n Fast Settling Time: 570ns to 18-Bit, 2VP-P Output
n Low Distortion: THD = –116.8dB at 2kHz
n Wide Supply Range: 3V to 12.6V
n Output Swings Rail-to-Rail
n 215MHz Gain-Bandwidth Product
n Specified Temperature Range: –40°C to 125°C
n LT6236 Shutdown to 10μA Max
n LT6236 in Low Profile (1mm) ThinSOT™ Package
n Dual LT6237 in 3mm × 3mm 8-Lead DFN and 8-Lead
MSOP Packages
APPLICATIONS
n 16-Bit and 18-Bit SAR ADC Drivers
n Active Filters
n Low Noise, Low Power Signal Processing
LT6236/LT6237
Rail-to-Rail Output
215MHz, 1.1nV/√Hz
Op Amp/SAR ADC Driver
DESCRIPTION
The LT®6236/LT6237 are single/dual low noise, rail-to-rail
output op amps that feature 1.1nV/√Hz input referred noise
voltage density and draw only 3.5mA of supply current per
amplifier. These amplifiers combine very low noise and
supply current with a 215MHz gain bandwidth product
and a 70V/μs slew rate. Low noise, fast settling time and
low offset voltage make this amplifier optimal to drive
low noise, high speed SAR ADCs. The LT6236 includes a
shutdown feature that can be used to reduce the supply
current to less than 10μA.
This amplifier family has an output that swings within
50mV of either supply rail to maximize the signal dynamic
range in low supply applications and is specified on 3.3V,
5V and ±5V supplies.
The LT6236/LT6237 are upgrades to the LT6230/LT6231,
offering similar performance with reduced wideband noise
beyond 100kHz.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
TYPICAL APPLICATION
Differentially Driving a SAR ADC
VS+= 6V
IN+ +
1/2 LT6237
–
–
1/2 LT6237
IN– +
VS–= –2V
LOWPASS FILTERS
38.3Ω
49.9Ω
270pF
38.3Ω
270pF
49.9Ω
IN+
LTC2389-18
IN–
18-BIT
2.5Msps
623637 TA01a
LT6237 Driving LTC2389-18 fIN = 2kHz,
–1dBFS, 32768-Point FFT
0
–10
VOUT = 7.3VP-P
–20
–30
HD2 = –129.5dBc
HD3 = –118.7dBc
SFDR = 117.7dB
–40
THD = –116.8dB
–50
SNR = 99.7dB
–60
SINAD = 98.9dB
–70
–80
–90
–100
–110
–120
–130
–140
–150
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
FREQUENCY (MHz)
62367 TA01b
623637f
1