LTC6404IUD-2#PBF Linear Technology, LTC6404IUD-2#PBF Datasheet - Page 16

• Manufacturer Part Number: LTC6404IUD-2#PBF
• Description: IC AMP/DRIVER DIFF 16-QFN
• Manufacturer: Linear Technology
• Type: ADC Driverr

Specifications of LTC6404IUD-2#PBF

• Applications: Data Acquisition
• Mounting Type: Surface Mount
• Package / Case: 16-WQFN Exposed Pad
• Current - Supply: 30.4mA
• Operating Temperature: -40°C ~ 85°C
• Output Type: Differential, Rail-to-Rail
• Number Of Circuits: 1
• Current - Output / Channel: 85mA
• Amplifier Type: Differential
• Voltage - Supply, Single/dual (±): 2.7 V ~ 5.5 V, ±1.35 V ~ 2.75 V
• -3db Bandwidth: 600MHz
• Slew Rate: 700 V/µs
• Gain Bandwidth Product: 900MHz
• Current - Input Bias: 23µA
• Voltage - Input Offset: 500µV
• Number Of Channels: 1
• Number Of Elements: 1
• Power Supply Requirement: Single
• Common Mode Rejection Ratio: 60dB
• Voltage Gain Db: 90dB
• Unity Gain Bandwidth Product (typ): 900MHz
• Input Resistance: 1@3V@-40C TO 85CMohm
• Single Supply Voltage (typ): 3/5V
• Dual Supply Voltage (typ): Not RequiredV
• Power Supply Rejection Ratio: 60dB
• Rail/rail I/o Type: Rail to Rail Output
• Single Supply Voltage (min): 2.7V
• Single Supply Voltage (max): 5.25V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 16
• Package Type: QFN EP
• No. Of Amplifiers: 1
• Input Offset Voltage: 2mV
• Gain Db Max: 2dB
• Bandwidth: 900MHz
• Supply Voltage Range: 2.7V To 5.25V
• Supply Current: 30.4mA
• Amplifier Case Style: QFN
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIONS INFORMATION
LTC6404-2
Noise Considerations
The LTC6404-2’s input referred voltage noise is on the
order of 1.5nV/√Hz. Its input referred current noise is on
the order of 3pA/√Hz. In addition to the noise generated
by the amplifi er, the feedback resistors also contribute
noise. A noise model is shown in Figure 9. The output
noise generated by both the amplifi er and the feedback
components is governed by the equation:
A plot of this equation, and a plot of the noise generated
by the feedback components for the LTC6404-2 is shown
in Figure 10.
16
e
no
=
2 • e
e
ni
• 1+
nRI
•
R
R
R
R
F
I
e
F
I
ncm
2
2
V
V
2
+
–
+ 2 • I
+ 2 • e
(
1
2
3
4
n
SHDN
V
V
V
nRF
e
e
+
–
OCM
nR11
• R
nRI2
16
V
V
5
SHDN
2
+
–
2
2
F
Figure 9. Noise Model of the LTC6404-2
NC
NC
)
i
i
e
n
n
R
R
2
ni
2
2
I2
I1
2
+
15
6
IN
IN
R
R
+
–
V
+
–
F2
F1
OCM
e
e
nRF2
nRF1
14
7
2
2
OUT
OUT
–
+
The LTC6404-2’s input referred voltage noise contributes
the equivalent noise of a 140Ω resistor. When the feedback
network is comprised of resistors whose values are less
than this, the LTC6404-2’s output noise is voltage noise
dominant (See Figure 10.):
Feedback networks with R
400Ω will result in output noise which is resistor noise
and amplifi er current noise dominant.
Lower R
noise at the penalty of increased distortion due to increased
loading of the feedback network on the output. Higher
13
8
e
e
OUTF
OUTF
no
no
LTC6404-2
V
+
–
+
V
V
–
–
64042 F09
F
e
V
V
V
V
ni
resistor values (<200Ω) always result in lower
–
+
+
–
2 •
12
11
10
9
• 1+
(
I
n
V
V
V
R
R
+
–
–
• R
F
I
F
e
nof
)
2
2
+ 1+
F
e
no
values greater than about
2
R
R
F
I
• 4 • k • T • R
F
64042f