LTC6360CMS8E#PBF Linear Technology, LTC6360CMS8E#PBF Datasheet - Page 11

• Manufacturer Part Number: LTC6360CMS8E#PBF
• Manufacturer: Linear Technology

Specifications of LTC6360CMS8E#PBF

• Lead Free Status / Rohs Status: Supplier Unconfirmed

operaTion
The LTC6360 is a low noise amplifier suitable for driving
single-ended high performance successive approximation
register (SAR) ADCs. The LTC6360 uses a single ampli-
fier with negative charge pump topology as shown in the
Block Diagram.
The output can swing from –0.48V to 4.91V. The ampli-
fier is designed to drive a series 10Ω resistor and 330pF
capacitor filter network to ground, although larger load
capacitances can be driven.
An on-chip low noise charge pump generates a small
negative voltage (typically –0.6V) at the CPO pin. This
negative voltage is normally connected to the amplifier’s
output stage via the CPI pin, allowing the output to swing
to true zero on a single 5V supply. Compared to typical
rail-to-rail output amplifiers that can only swing to within
a few hundred millivolts of ground, the LTC6360 provides
improved linearity and increased functionality for applica-
tions that benefit from a true zero output swing.
The LTC6360 features a low noise amplifier that can
support a signal-to-noise ratio of 110dB over a 3MHz
noise bandwidth.
Basic Connections
Shown in Figure 2 is a typical application for the LTC6360
as a unity gain driver. The amplifier’s two inputs (+IN and
–IN) can accommodate a voltage range of 0V to 4.25V on
+
–
V
V
0V TO 4V
IN
IN
4V
0V
Figure 2. Unity Gain Driver.
+IN
–IN
+
–
SHDN
5V
OUT
10
LTC6360
330pF
CHARGE
PUMP
V
CPI
OUT
V
CC
0.1µF
V
0.1µF
DD
CPO
4V
GND
6360 F02
0V
1µF
10µF
5V
a single 5V rail. This provides a simple interface for 5V
ADCs with a 4.096V full-scale range.
Noninverting gain (shown in Figure 3) and inverting gain
(shown in Figure 4) configurations are also possible. For
best DC precision, R
lel combination of R
capacitor to reduce its noise contribution.
+
–
+
–
Figure 3. Noninverting Gain Configuration.
V
V
IN
R
R
IN
Figure 4. Inverting Gain Configuration
R
R
S
S
G
G
+IN
+IN
–IN
–IN
–
+
–
+
C
F
S
S
R
C
R
C
F
F
and R
F
F
should be made equal to the paral-
SHDN
SHDN
5V
5V
OUT
OUT
R
R
LTC6360
LTC6360
FILT
G
FILT
C
C
FILT
FILT
. R
CHARGE
CHARGE
PUMP
PUMP
S
V
V
CPI
CPI
OUT
OUT
can be bypassed with a
V
V
CC
CC
0.1µF
0.1µF
V
V
0.1µF
0.1µF
DD
DD
LTC6360
CPO
CPO
GND
GND
6360 F04
6360 F03
11
1µF
1µF
10µF
10µF
5V
5V
6360f