LTC1968 High precision broadband RMS-DC RMS converter 15MHZ frequency

High precision broadband RMS-DC RMS Converter (LTC196X)

Chip features Product Application:

The LTC1968 is an RMS to DC converter. The benefits of the LTC1968 proprietary architecture over traditional logarithmic antilogarithmic RMS to DC converters are higher linearity and accuracy, bandwidth independent of amplitude, and improved temperature stability. The LTC1968 uses single-ended or differential input signals and accurately supports a peak factor of up to 4, rail-to-rail common-mode input range. The differential input range is 1Vpp and provides unprecedented linearity. The LTC1968 allows perturbed system calibration at any input voltage. The LTC1968 has a rail-to-rail output with a separate output reference pin that provides flexible reference level offset. Single power supply operating from 4.5V to 5.5V. Low power off mode reduces the supply current to 0.1uA. The LTC196X series RMS converter can be used for true RMS digital multimeter design and AC/DC mixed truth measurement.
.

Chip parameters:

1, high-precision true root mean square DC conversion: LF to 500kHz (to 15MHz-3dB bandwidth)

2, high linearity: 0.02% linearity allows system calibration.

3. Use Delta-Sigma conversion technology.

4, flexible signal input mode to be tested: differential or single-ended input, support AC-DC coupling input and level bias.

5, input signal amplitude range:

6, flexible output: rail to rail output, independent output reference pin allows level offset

6, power supply voltage range: + -2.5V or +5V

7, operating temperature range: -40℃ to +125℃

8. Ultra-low turn-off current: 0.1uA
Technical index

1, power supply voltage :+5V/+-2.5V DC (typical current value within 10mA)

2, input amplitude range: 0-500 mVrms

3, frequency range: LF-500kHZ(15MHZ input -3dB error)

4, the chip inside the single-ended, differential input, and voltage bias input channels are led out for secondary development.

5, compatible with LTC1966/7/8, can be secondary development, with metal shell shield

Measured parameter

support three different input modes, and single or dual power supply configuration

 

 

1, Figure 9a input :LTC1968 +-2.5V power supply IN1 single-end input AC; Jumper cap J4 connects pins 2 and 3 (VSS end); Jumper cap J2 no need to connect; J5 short-circuit; J3, J7, and J8 are disconnected. (Note that the power supply voltage from J1 input plus or minus 2.5V, plus or minus 5V will cause the chip to burn out).

2, Figure 9b input :LTC1968 single-source +5V power supply IN1 single-end input AC; Jumper cap J4 connects pins 1 and 2 (GND end); Jumper cap J2 connects pins 1 and 2 (equivalent to access 1/2VCC voltage); J5, J3, J7, and J8 are disconnected. (Note that the power supply impulse J1 VCC input +5V voltage).

2, Figure 9c input :LTC1968 single-source +5V power supply IN1 single-end input AC+DC; Jumper cap J4 connects pins 1 and 2 (GND end); Jumper cap J2 connects pins 2 and 3 (equivalent to grounding through capacitance); J3 short-circuit; J5, J7, and J8 are disconnected. (Note that the power supply impulse J1 VCC input +5V voltage).