LT6604 Linear Technology Corporation, LT6604 Datasheet - Page 8

• Manufacturer Part Number: LT6604
• Description: Dual Very Low Noise, Differential Ampli?er And 5mhz Lowpass Filter
• Manufacturer: Linear Technology Corporation

LT6604-5
+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 limit 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 Pins V
Pin 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
R
R
R
R
V
V
IN
IN
OCMA
IN
IN
pin is internally biased at mid
MIDB
–
+INA
–INA
+INB
–INB
NC
NC
NC
NC
NC
NC
. For dual supply operation,
V
–
+
+
V
–
V
–
806Ω
806Ω
806Ω
806Ω
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 PCB. If V
Exposed Pad to V
V
V
400Ω
400Ω
400Ω
400Ω
V
V
+
+
–
–
A
B
11k
11k
11k
11k
NC
V
–
+ –
V
+ –
V
–
–
V
V
400Ω
400Ω
400Ω
400Ω
OCM
OCM
+
–
B
FILTER STAGE
FILTER STAGE
+
+
LOWPASS
LOWPASS
–
.
–
is separate from ground, tie the
66045 BD
–
. The Exposed Pad must be
NC
–OUTA
NC
+OUTA
NC
V
V
NC
NC
–OUTB
NC
+OUTB
NC
+
–
A
66045f