LTC2668 datasheet(25/40 Pages) LINER

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LTC2348-16

234816fa

For more information www.linear.com/LTC2348-16

±5V RANGE

IN+ = IN– = 1VP–P SINE

IN+ = IN– = 24VP–P SINE

OP–AMPS SLEW fIN > 30kHz

FREQUENCY (Hz)

100

10k

100k

100

110

120

CMRR vs Input Frequency

234816 F07b

Figure 7b. CMRR vs Input Frequency. Circuit Shown in Figure 7a

SNR = 89.5dB

THD = –120dB

SINAD = 89.5dB

SFDR = 122dB

±5V RANGE

FULLY DIFFERENTIAL DRIVE (IN– = –IN+)

FREQUENCY (kHz)

–180

–160

–140

–120

–100

–80

–60

–40

–20

234816 F07c

Figure 7c. IN+/IN– = 450mV 2kHz Fully Differential Sine,

0V ≤ VCM ≤ 24V, 32k Point FFT, fSMPL = 100ksps. Circuit

Shown in Figure 7a

–15V

15V

LTC2348-16

234816 F08

ONLY CHANNELS 0 AND 1 SHOWN FOR CLARITY

0.1µF

47µF

–10.24V ≤ VS1 ≤ 10.24V

–10.24V ≤ VS2 ≤ 10.24V

VS1 – VS2

RSENSE

ISENSE =

IN0+

IN0–

IN1+

IN1–

VCC

REFIN

REFBUF

VEE

ISENSE

RSENSE

VS2

VS1

Figure 8. Simultaneously Sense Voltage (CH0) and

Current (CH1) Over a Wide Common Mode Range

Buffering Single-Ended Analog Input Signals

While the circuit shown in Figure 6a is capable of buffering

single-ended input signals, the circuit shown in Figure 9 is

preferable when the single-ended signal reference level is

inherently low impedance and doesn't require buffering.

This circuit eliminates one driver and lowpass filter, reduc-

ing part count, power dissipation, and SNR degradation

due to driver noise. Using the recommended driver and

filter combinations in Table 2, the performance of this

circuit with single-ended input signals is on par with the

performance of the circuit in Figure 6a.

–15V

15V

LTC2348-16

234816 F09

ONLY CHANNEL 0 SHOWN FOR CLARITY

TRUE BIPOLAR

+10V

–10V

+10V

–10V

UNIPOLAR

–

0.1µF

47µF

IN0+

IN0–

AMPLIFIER

VCC

REFIN

REFBUF

VEE

OPTIONAL

LOWPASS FILTER

CFILT

RFILT

IN+

IN–

Figure 9. Buffering Single-Ended Input Signals. See Table 2 For Recommended Amplifier and Filter Combinations

applicaTions inForMaTion

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