LT6604-2.5 Linear Technology, LT6604-2.5 Datasheet - Page 8

• Manufacturer Part Number: LT6604-2.5
• Description: Dual Very Low Noise Differential Amplifier and 2.5MHz Lowpass Filter
• Manufacturer: Linear Technology

LT6604-2.5
+OUTA, – 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 greater than ±40mA, each pin
can drive a 100Ω and/or 50pF load to AC ground.
V
supply, see Block Diagram. For single supply operation
the V
ceramic capacitor to V
34 can be bypassed or connected to a high quality DC
BLOCK DIAGRAM
PIN FUNCTIONS
8
MIDA
MIDA
(Pin 34): The V
pin should be bypassed with a quality 0.01μF
V
V
V
V
IN
IN
IN
IN
MIDA
+
–
+
–
–
A
B
A
B
. For dual supply operation, Pin
R
R
R
R
V
V
pin is internally biased at mid-
IN
IN
OCMA
IN
IN
MIDB
+INA
–INA
+INB
–INB
NC
NC
NC
NC
NC
NC
V
–
+
+
V
–
V
–
1580Ω
1580Ω
1580Ω
1580Ω
OCM
OCM
OP AMP
OP AMP
–
–
+
+
V
V
MIDA
OCMB
NC
NC
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 of the fi lter in chan-
nel A. It has a 5.5kΩ impedance, and it can be overridden
with an external low impedance voltage source.
Exposed Pad (Pin 35): V
soldered to the PCB. If V
the Exposed Pad to V
V
V
800Ω
800Ω
800Ω
800Ω
V
V
+
+
–
–
A
B
11k
11k
11k
11k
NC
V
–
+ –
V
+ –
V
–
–
V
V
800Ω
800Ω
800Ω
800Ω
OCM
OCM
+
–
B
FILTER STAGE
FILTER STAGE
+
+
LOWPASS
LOWPASS
–
.
–
660025 BD
–
. The Exposed Pad must be
is separate from ground, tie
NC
–OUTA
NC
+OUTA
NC
V
V
NC
NC
–OUTB
NC
+OUTB
NC
+
–
A
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