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LT6604IUFF-15#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LT6604-15
7
660415fb
PIN FUNCTIONS
+INA and –INA (Pins 2, 4): Channel A Input Pins. Signals
can be applied to either or both input pins through identi-
cal external resistors, R
IN
. The DC gain from differential
inputs to the differential outputs is 536/R
IN
.
V
OCMA
(Pin 6): DC Common Mode Reference Voltage
for the 2nd Filter Stage in Channel A. Its value programs
the common mode voltage of the differential output of
the fi lter. Pin 6 is a high impedance input, which can be
driven from an external voltage reference, or Pin 6 can be
tied to Pin 34 on the PC board. Pin 6 should be bypassed
with a 0.01µF ceramic capacitor unless it is connected to
a ground plane.
V
–
(Pins 7, 24, 31, 32, 35): Negative Power Supply Pin
(can be ground).
V
MIDB
(Pin 8): The V
MIDB
pin is internally biased at mid-
supply, see Block Diagram. For single supply operation
the V
MIDB
pin should be bypassed with a quality 0.01µF
ceramic capacitor to ground. For dual supply operation,
Pin 8 can be bypassed or connected to a high quality DC
ground. A ground plane should be used. A poor ground
will increase noise and distortion. Pin 8 sets the output
common mode voltage of the 1st Filter Stage in channel B.
It has a 5.5k impedance, and it can be overridden with
an external low impedance voltage source.
+INB and –INB (Pins 10, 12): Channel B Input Pins. Signals
can be applied to either or both input pins through identi-
cal external resistors, R
IN
. The DC gain from differential
inputs to the differential outputs is 536/R
IN
.
V
OCMB
(Pin 14): Is the DC Common Mode Reference
Voltage for the 2nd Filter Stage in Channel B. Its value
programs the common mode voltage of the differential
output of the fi lter. Pin 14 is a high impedance input, which
can be driven from an external voltage reference, or Pin
14 can be tied to Pin 8 on the PC board. Pin 14 should
be bypassed with a 0.01µF ceramic capacitor unless it is
connected to a ground plane.
V
+
A and V
+
B (Pins 25, 17): Positive Power Supply Pins
for Channels A and B. For a single 3.3V or 5V supply (Pins
7, 24, 31, 32 and 35 grounded) a quality 0.1µF ceramic
bypass capacitor is required from the positive supply pin
(Pins 25, 17) to the negative supply pin (Pins 7, 24, 31,
32 and 35). The bypass should be as close as possible to
the IC. For dual supply applications, bypass the negative
supply pins to ground and Pins 25 and 17 to ground with
a quality 0.1µF ceramic capacitor.
+OUTB and –OUTB (Pins 19, 21): O u t p u t P i n s . P i n s 19 a n d
21 are the fi lter differential outputs for channel B. With a
typical short-circuit current limit greater than ±40mA each
pin can drive a 100 and/or 50pF load to AC ground.
+OUTA and –OUTA (Pins 27, 29): Output Pins. Pins 27 and
29 are the fi lter differential outputs for channel A. With a
typical short-circuit current limit greater than ±40mA each
pin can drive a 100 and/or 50pF load to AC ground.
V
MIDA
(Pin 34): The V
MIDA
pin is internally biased at mid-
supply, see Block Diagram. For single supply operation
the V
MIDA
pin should be bypassed with a quality 0.01µF
ceramic capacitor to ground. For dual supply operation,
Pin 34 can be bypassed or connected to a high quality DC
ground. A ground plane should be used. A poor ground
will increase noise and distortion. Pin 34 sets the output
common mode voltage of the 1st stage fi lter stage in chan-
nel A. It has a 5.5k impedance, and it can be overridden
with an external low impedance voltage source.
Exposed Pad (Pin 35): V
–
. The Exposed Pad must be
soldered to the PCB.
LT6604-15
8
660415fb
BLOCK DIAGRAM
–
+
–
+
V
OCM
–
–
+
+
V
OCM
536Ω
536Ω
200Ω
200Ω
200Ω
200Ω
V
+
A
V
+
B
V
–
11k
11k
OP AMP
PROPRIETARY
LOWPASS
FILTER STAGE
V
IN
–
B
V
IN
+
B
V
IN
+
A
V
IN
–
A
R
IN
R
IN
R
IN
R
IN
660415 BD
V
OCMB NCNC V
+
B
NC
+OUTA
–OUTA
NC
NC
V
+
A
NC
V
–
NC
NC
+OUTB
NC
–OUTB
V
–
V
–
V
MIDA
V
OCMA
V
MIDB
V
–
NC
NC
1
2
3
4
5
6
7
8
9
NC
NC
NC
+INA
–INA
+INB
–INB
NC
NC
–
+
–
+
V
OCM
–
–
+
+
V
OCM
536Ω
536Ω
200Ω
200Ω
200Ω
200Ω
V
–
11k
11k
OP AMP
PROPRIETARY
LOWPASS
FILTER STAGE
10
11
12
13
14 15 16 17
18
19
20
21
22
23
24
25
26
27
28
29
30
31323334
LT6604-15
9
660415fb
APPLICATIONS INFORMATION
Interfacing to the LT6604-15
Note: The LT6604-15 contains two identical fi lters. The
following applications information only refers to one fi lter.
The two fi lters are independent except that they share the
same negative supply voltage V
–
. The two fi lters can be
used simultaneously by replicating the example circuits.
The referenced pin numbers correspond to the A channel
fi lter
The LT6604-15 channel requires two equal external re-
sistors, R
IN
, to set the differential gain to 536/R
IN
. The
inputs to the fi lter are the voltages V
IN
+
and V
IN
–
presented
to these external components, Figure 1. The difference
between V
IN
+
and V
IN
–
is the differential input voltage. The
average of V
IN
+
and V
IN
–
i s t h e c o m m o n m o d e i n p u t v o l t a g e .
Similarly, the voltages V
OUT
+
and V
OUT
–
appearing at Pins
27 and 29 of the LT6604-15 are the fi lter outputs. The dif-
ference between V
OUT
+
and V
OUT
–
is the differential output
voltage. The average of V
OUT
+
and V
OUT
–
is the common
mode output voltage. Figure 1 illustrates the LT6604-15
operating with a single 3.3V supply and unity passband
gain; the input signal is DC coupled. The common mode
input voltage is 0.5V, and the differential input voltage is
2V
P-P
. The common mode output voltage is 1.65V, and the
differential output voltage is 2V
P-P
for frequencies below
15MHz. The common mode output voltage is determined
by the voltage at V
OCM
. Since V
OCM
is shorted to V
MID
,
the output common mode is the mid-supply voltage. In
addition, the common mode input voltage can be equal
to the mid-supply voltage of V
MID
.
Figure 2 shows how to AC couple signals into the LT6604-15.
In this instance, the input is a single-ended signal. AC cou-
pling allows the processing of single-ended or differential
signals with arbitrary common mode levels. The 0.1µF
coupling capacitor and the 536 gain setting resistor
form a high pass fi lter, attenuating signals below 3kHz.
Larger values of coupling capacitors will proportionally
reduce this highpass 3dB frequency.
–
+
536
536
0.01µF
0.1µF
3.3V
–
+
V
IN
–
V
IN
+
25
27
4
34
6
2
29
7
660415 F01
V
OUT
+
V
OUT
–
V
t
3
2
1
V
IN
+
V
IN
–
V
t
3
2
1
V
OUT
+
LT6604-15
V
OUT
–
0 0
1/2
–
+
536
536
0.01µF
0.1µF
0.1µF
0.1µF
3.3V
–
+V
IN
+
25
1/2
27
4
34
6
2
29
7
660415 F02
V
OUT
+
V
OUT
–
V
3
2
2
1
V
t
1
0
0
–1
V
IN
+
LT6604-15
V
OUT
+
V
OUT
–
Figure 1
Figure 2
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT6604IUFF-15#PBF

Mfr. #:
Buy LT6604IUFF-15#PBF
Manufacturer:
Analog Devices Inc.
Description:
Differential Amplifiers Dual Differential Amplifier and 15MHz Lowpass Filter
Lifecycle:
New from this manufacturer.
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