LTC6605CDJC-7#PBF Linear Technology, LTC6605CDJC-7#PBF Datasheet - Page 16

• Manufacturer Part Number: LTC6605CDJC-7#PBF
• Description: IC FILTER 7MHZ DUAL 22-DFN
• Manufacturer: Linear Technology

Specifications of LTC6605CDJC-7#PBF

• Filter Type: Antialiasing
• Frequency - Cutoff Or Center: 5MHz
• Number Of Filters: 2
• Max-order: 2nd
• Voltage - Supply: 2.7 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 22-DFN
• No. Of Amplifiers: 2
• Input Offset Voltage: 1mV
• Gain Db Max: 14dB
• Bandwidth: 7MHz
• Supply Voltage Range: 2.7V To 5.25V
• Supply Current: 33.1mA
• Amplifier Case Style: DFN
• No. Of Pins: 22
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LTC6605-7
APPLICATIONS INFORMATION
For split power supplies, it is recommended that addi-
tional high quality X5R or X7R, 0.1μF capacitors be used
to bypass pin V
minimal routing.
For driving heavy differential loads (< 200Ω), additional
bypass capacitance may be needed between V
optimal performance. Keep in mind that small geometry
(e.g., 0603) surface mount ceramic capacitors have a much
higher self-resonant frequency than do leaded capacitors,
and perform best in high speed applications.
The V
quality ceramic capacitor (at least 0.01μF). In split-sup-
ply applications, the V
ground or directly hard wired to ground.
Stray parasitic capacitances to any unused input pins
should be kept to a minimum to prevent deviations from the
ideal frequency response. The best approach is to remove
the solder pads for the unused component pins and strip
away any ground plane underneath. Floating unused pins
does not reduce the reliability of the part.
At the output, always keep in mind the differential nature
of the LTC6605-7, because it is important that the load
impedances seen by both outputs (stray or intended) be
16
OCM
pins should be bypassed to ground with a high
+
to ground and V
OCM
pin can be either bypassed to
–
to ground, again with
+
and V
–
for
as balanced and symmetric as possible. This will help pre-
serve the balanced operation that minimizes the generation
of even-order harmonics and maximizes the rejection of
common mode signals and noise.
Driving ADCs
The LTC6605-7’s rail-to-rail differential output and adjust-
able output common mode voltage make it ideal for inter-
facing to differential input ADCs. These ADCs are typically
supplied from a single-supply voltage which can be as
low as 3V (2.7V minimum), and have an optimal common
mode input range near mid-supply. The LTC6605-7 makes
interfacing to these ADCs easy, by providing antialiasing,
single-ended to differential conversion and common mode
level shifting.
The sampling process of ADCs creates a transient that is
caused by the switching in of the ADC sampling capaci-
tor. This momentarily “shorts” the output of the amplifi er
as charge is transferred between amplifi er and sampling
capacitor. The amplifi er must recover and settle from this
load transient before the acquisition period has ended, for
a valid representation of the input signal. The LTC6605-7
will settle quickly from these periodic load impulses. The
RC network between the outputs of the driver decouples
66057f