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LTC1966

sn1966 1966fas

The q denotes specifications which apply over the full operating

temperature range, otherwise specifications are TA = 25°C. VDD = 5V, VSS = – 5V, VOUTRTN = 0V, CAVE = 10µF, VIN = 200mVRMS,

VENABLE = 0.5V unless otherwise noted.

ELECTRICAL CHARACTERISTICS

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: The inputs (IN1, IN2) are protected by shunt diodes to VSS and

VDD. If the inputs are driven beyond the rails, the current should be limited

to less than 10mA.

Note 3: The LTC1966 output (VOUT) is high impedance and can be

overdriven, either sinking or sourcing current, to the limits stated.

Note 4: The LTC1966C/LTC1966I are guaranteed functional over the

operating temperature range of – 40

°C to 85°C.

Note 5: The LTC1966C is guaranteed to meet specified performance from

°C to 70°C. The LTC1966C is designed, characterized and expected to

meet specified performance from – 40

°C to 85°C but is not tested nor QA

sampled at these temperatures. The LTC1966I is guaranteed to meet

specified performance from – 40

°C to 85°C.

Note 6: High speed automatic testing cannot be performed with

CAVE = 10µF. The LTC1966 is 100% tested with CAVE = 22nF. Correlation

tests have shown that the performance limits above can be guaranteed

with the additional testing being performed to guarantee proper operation

of all the internal circuitry.

Note 7: High speed automatic testing cannot be performed with 60Hz

inputs. The LTC1966 is 100% tested with DC and 10kHz input signals.

Measurements with DC inputs from 50mV to 350mV are used to calculate

the four parameters: GERR, VOOS, VIOS and linearity error. Correlation tests

have shown that the performance limits above can be guaranteed with the

additional testing being performed to guarantee proper operation of all

internal circuitry.

Note 8: The LTC1966 is inherently very linear. Unlike older log/antilog

circuits, its behavior is the same with DC and AC inputs, and DC inputs are

used for high speed testing.

Note 9: The power supply rejections of the LTC1966 are measured with

DC inputs from 50mV to 350mV. The change in accuracy from VDD = 2.7V

to VDD = 5.5V with VSS = 0V is divided by 2.8V. The change in accuracy

from VSS = 0V to VSS = –5.5V with VDD = 5.5V is divided by 5.5V.

Note 10: Previous generation RMS-to-DC converters required nonlinear

input stages as well as a nonlinear core. Some parts specify a “DC reversal

error,” combining the effects of input nonlinearity and input offset voltage.

The LTC1966 behavior is simpler to characterize and the input offset

voltage is the only significant source of “DC reversal error.”

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Output Characteristics

OVR

Output Voltage Range

VSS

VDD

ZOUT

Output Impedance

(Note 12)

Ω

CMRRO

Output Common Mode Rejection

(Note 13)

200

µV/V

VOMAX

Maximum Differential Output Swing

Accuracy = 2%, DC Input (Note 14)

1.0

1.05

0.9

PSRRO

Power Supply Rejection

VDD Supply (Note 9)

250

1000

µV/V

VSS Supply (Note 9)

500

µV/V

Frequency Response

f1P

1% Additional Error (Note 15)

CAVE = 10µF6

kHz

f10P

10% Additional Error (Note 15)

CAVE = 10µF20

kHz

f–3dB

±3dB Frequency (Note 15)

800

kHz

Power Supplies

VDD

Positive Supply Voltage

2.7

5.5

VSS

Negative Supply Voltage

(Note 16)

– 5.5

IDD

Positive Supply Current

IN1 = 20mV, IN2 = 0V

155

170

µA

IN1 = 200mV, IN2 = 0V

158

µA

ISS

Negative Supply Current

IN1 = 20mV, IN2 = 0V

µA

Shutdown Characteristics

IDDS

Supply Currents

VENABLE = 4.5V

0.5

µA

ISSS

Supply Currents

VENABLE = 4.5V

–1

–0.1

µA

IIH

ENABLE Pin Current High

VENABLE = 4.5V

– 0.3

– 0.05

µA

IIL

ENABLE Pin Current Low

VENABLE = 0.5V

–2

–1

– 0.1

µA

VTH

ENABLE Threshold Voltage

VDD = 5V, VSS = – 5V

2.4

VDD = 5V, VSS = GND

2.1

VDD = 2.7V, VSS = GND

1.3

VHYS

ENABLE Threshold Hysteresis

0.1

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