参数资料
型号: LTC6405CMS8E#PBF
厂商: LINEAR TECHNOLOGY CORP
元件分类: 模拟信号调理
英文描述: SPECIALTY ANALOG CIRCUIT, PDSO8
封装: LEAD FREE, PLASTIC, MSOP-8
文件页数: 5/24页
文件大小: 281K
代理商: LTC6405CMS8E#PBF
LTC6405
13
6405fa
APPLICATIONS INFORMATION
Figure 1. DC Test Circuit
+
1
SHDN
5
6
–IN
7
+OUT
8
+OUTF
16
15
+IN
VTIP
NC
14
–OUT
13
–OUTF
V–OUTF
RF
CF
V+OUTF
V–OUT
V+OUT
2
V+
3
V
V+
V
V+
V
4
VOCM
VSHDN
VVOCM
VOCM
12
V
11
V+
10
V+
9
V
CF
V
6405 F01
LTC6405
SHDN
0.1μF
0.01μF
VCM
RF
RI
RBAL
100k
RBAL
100k
+
VINP
+
VINM
V–IN
V+IN
VOUTCM
V+
0.1μF
V
0.1μF
1.25pF
0.1μF
0.01μF
50Ω
(RI, RF: 0.1% RESISTORS)
*TO OPTIMIZE THE HIGH FREQUENCY PERFORMANCE FOR THE PIN CONFIGURATION OF THE LTC6405
IN THE SMALL MSOP PACKAGE, A FEEDBACK RESISTANCE OF AT LEAST 300Ω IS RECOMMENDED.
PACKAGE
MSOP*
QFN
DEFAULT VALUES
CF
1.0pF
1.8pF
RI
300Ω
200Ω
RF
300Ω
200Ω
Functional Description
The LTC6405 is a small outline, wideband, low noise, and
low distortion fully-differential amplier with accurate
output phase balancing. The LTC6405 is optimized to
drive low voltage, single-supply, differential input analog-
to-digital converters (ADCs). The LTC6405 input common
mode range is rail-to-rail, while the output common mode
voltage is independently adjustable by applying a voltage
on the VOCM pin. The output voltage swing extends from
near-ground to 4V, to be compatible with a wide range of
ADC converter input requirements. This makes the LTC6405
ideal for level shifting signals with a wide common mode
range for driving 12-bit to 16-bit single supply, differential
input ADCs. The differential output allows for twice the
signal swing in low voltage systems when compared to
single-ended output ampliers. The balanced differential
nature of the amplier also provides even-order harmonic
distortion cancellation, and less susceptibility to common
mode noise (like power supply noise). The LTC6405 can be
used as a single ended input to differential output amplier,
or as a differential input to differential output amplier.
The LTC6405 output common mode voltage, dened as the
average of the two output voltages, is independent of the
input common mode voltage, and is adjusted by applying
a voltage on the VOCM pin. If the pin is left open, there
is an internal resistive voltage divider, which develops a
potential of 2.5V (if the supply is 5V). It is recommended
that a high quality ceramic cap is used to bypass the VOCM
pin to a low impedance ground plane. The LTC6405’s
internal common mode feedback path forces accurate
output phase balancing to reduce even order harmonics,
and centers each individual output about the potential set
by the VOCM pin.
V
OUTCM = VOCM =
V+OUT + V–OUT
2
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