LTC6362
1
6362fa
TYPICAL APPLICATION
FEATURES DESCRIPTION
Precision, Low Power
Rail-to-Rail Input/Output
Differential Op Amp/SAR
ADC Driver
The LTC
®
6362 is a low power, low noise differential op
amp with rail-to-rail input and output swing that has been
optimized to drive low power SAR ADCs. The LTC6362
draws only 1mA of supply current in active operation, and
features a shutdown mode in which the current consump-
tion is reduced to 70μA.
The amplifier may be configured to convert a single-
ended input signal to a differential output signal, and is
capable of being operated in an inverting or noninverting
configuration.
Low offset voltage, low input bias current, and a stable
high impedance configuration make this amplifier suit-
able for use not only as an ADC driver but also earlier in
the signal chain, to convert a precision sensor signal to
a balanced (differential) signal for processing in noisy
industrial environments.
The LTC6362 is available in an 8-lead MSOP package and
also in a compact 3mm × 3mm 8-pin leadless DFN pack-
age, and operates with guaranteed specifications over a
–40°C to 125°C temperature range.
DC-Coupled Interface from a Ground-Referenced
Single-Ended Input to an LTC2379-18 SAR ADC
APPLICATIONS
n
1mA Supply Current
n
Single 2.8V to 5.25V supply
n
Fully Differential Input and Output
n
200μV Max Offset Voltage
n
260nA Max Input Bias Current
n
Fast Settling: 550ns to 18-Bit, 8V
P-P
Output
n
Low Distortion: –116dBc at 1kHz, 8V
P-P
n
Rail-to-Rail Inputs and Outputs
n
3.9nV/√Hz Input-Referred Noise
n
180MHz Gain-Bandwidth Product
n
34MHz –3dB Bandwidth
n
Low Power Shutdown: 70µA
n
8-Lead MSOP and 3mm × 3mm 8-Lead DFN Packages
n
16-Bit and 18-Bit SAR ADC Drivers
n
Single-Ended-to-Differential Conversion
n
Low Power Pipeline ADC Driver
n
Differential Line Drivers
n
Battery-Powered Instrumentation
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.
–
–
+
+
5V
3.9nF
3.9nF
3.9nF
A
IN
+
V
REF
V
DD
5V
LTC2379-18
SAR ADC
2.5V
GND
A
IN
–
18-BIT
1.6Msps
6362 TA01a
35.7Ω
35.7Ω
LTC6362
V
OCM
0.1µF
V
IN
1k
1k 1k
SHDN
LTC6362 Driving LTC2379-18
f
IN
= 2kHz, –1dBFS, 16384-Point FFT
FREQUENCY (kHz)
0
–150
–140
–120
–100
–80
–40
100
200
500 600 700
–20
–60
–130
–110
–90
–10
–50
–30
–70
300
400
800
6362 TA01b
V
S
= 5V, 0V
V
OUTDIFF
= 8.9V
P-P
HD2 = –116.0dBc
HD3 = –114.9dBc
SFDR = 110.1dB
THD = –108.0dB
SNR = 101.2dB
SINAD = 99.9dB