LT6350 Datasheet, PDF (1/28 Pages) Linear Technology – Low Noise Single-Ended to Differential Converter/ADC Driver

LT6350
FEATURES
Low Noise
Single-Ended to Differential
Converter/ADC Driver
DESCRIPTION
n _{Rail-to-Rail Input and Outputs}
n _{Fast Settling Time: 240ns, 0.01%, 8VP-P Output Step}
n _{1.9nV/√Hz Input-Referred Op Amp Noise}
n _{High Impedance Input}
n _{–3dB Bandwidth: 33MHz}
n _{2.7V to 12V Supply Operation}
n _{No External Gain-Resistors Required}
n _{4.8mA Supply Current}
n _{Low Power Shutdown}
n _{Low Distortion (HD2/HD3): –102dBc/–97dBc at}
100kHz, V_OUTDIFF = 4V_P-P
n _{Low Offset Voltage: ±400μV Max}
n _{High DC Linearity: <±1LSB, 16-Bit, 8VP-P}
n _{Low Input Current Noise: 1.1pA/√Hz}
n _{3mm × 3mm 8-Pin DFN and 8-Lead MSOP Packages}
APPLICATIONS
n _{16-Bit and 18-Bit SAR ADC Drivers}
n _{Single-Ended to Differential Conversion}
n _{Differential Line Driver}
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.
Protected by U.S. Patents including 5610557, 6344773.
The LT^®6350 is a rail-to-rail input and output low noise
single-ended to differential converter/ADC driver featuring
fast settling time. It converts a high or low impedance,
single-ended input signal to a low impedance, balanced,
differential output suitable for driving high performance
differential succesive approximation register (SAR) ADCs.
The two op amp topology features very low noise op amps,
that can support SNR >110dB in a 1MHz bandwidth.
The input op amp is trimmed for constant low input-referred
voltage offset over the input range to prevent V_OS steps
from degrading distortion.
On a single 5V supply, the outputs can drive ADCs from
55mV to 4.945V on each input. With the addition of a
negative supply, the LT6350 can drive ADCs from 0V to
4.945V on each input. Output common mode voltage is
set by applying a voltage to the +IN2 pin.
The LT6350 draws 4.8mA from a 5V supply and consumes
just 60μA in shutdown mode.
The LT6350 is available in a compact 3mm × 3mm, 8-pin
leadless DFN package and also in an 8-pin MSOP package
and operates over a –40°C to 125°C temperature range.
TYPICAL APPLICATION
ADC Driver: Single-Ended Input to Differential Output
5V
V_IN
0V to 4V
+–
0.1μF ^249Ω
+IN1 SHDN
V⁺
+
–
LT6350 ^–
+
–IN1
+IN2
V^–
OUT2
OUT1
5V
2200pF
A_IN–
LTC2393-16
A_IN+
499Ω
2V
–5V
0.1μF
249Ω
0.1μF
6350 TA01
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
0
20kHz Sine Wave,
–1dBFS 8192-Point FFT
V⁺ = 5V, V^– = –5V
V_OUTDIFF = 7.3V_P-P
V_+IN2 = 2.05V
SNR = 94.9dB
SINAD = 93.8dB
THD = –100.2dB
SFDR = 102.2dB
100 200 300 400 500
FREQUENCY (kHz)
6350 TA02
6350f
1