LTC1966 Linear Technology, LTC1966 Datasheet - Page 8

• Manufacturer Part Number: LTC1966
• Description: SIGMA RMS-to-DC Converter
• Manufacturer: Linear Technology

PI FU CTIO S
LTC1966
GND (Pin 1): Ground. A power return pin.
IN1 (Pin 2): Differential Input. DC coupled (polarity is
irrelevant).
IN2 (Pin 3): Differential Input. DC coupled (polarity is
irrelevant).
V
V
RMS averaging is accomplished with a single shunt ca-
pacitor from this node to OUT RTN. The transfer function
is given by:
8
SS
OUT
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U
V
(Pin 4): Negative Voltage Supply. GND to – 5.5V.
OUT
(Pin 5): Output Voltage. This is high impedance. The
–
U
OUT RTN
U
Average IN
2
–
IN
1
2
OUT RTN (Pin 6): Output Return. The output voltage is
created relative to this pin. The V
not balanced and this pin should be tied to a low imped-
ance, both AC and DC. Although it is typically tied to GND,
it can be tied to any arbitrary voltage, V
(V
OUT RTN = GND.
V
ENABLE (Pin 8): An Active-Low Enable Input. LTC1966 is
debiased if open circuited or driven to V
operation, pull to GND, a logic low or even V
DD
DD
(Pin 7): Positive Voltage Supply. 2.7V to 5.5V.
– Max Output). Best results are obtained when
OUT
and OUT RTN pins are
SS
DD
< OUT RTN <
. For normal
SS
.
sn1966 1966fas