LTC2348-16

25

234816fa

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

±5V RANGE

FREQUENCY (Hz)

10

100

1k

10k

100k

50

60

70

80

90

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

FREQUENCY (kHz)

0

10

20

30

40

50

–180

–160

–140

–120

–100

–80

–60

–40

–20

0

234816 F07c

Shown in Figure 7a

–15V

15V

LTC2348-16

234816 F08

ONLY CHANNELS 0 AND 1 SHOWN FOR CLARITY

0.1µF

0.1µF

0.1µF

47µF

REFIN

REFBUF

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

15V

15V

LTC2348-16

234816 F09

ONLY CHANNEL 0 SHOWN FOR CLARITY

TRUE BIPOLAR

+10V

0V

–10V

+10V

0V

–10V

UNIPOLAR

–

+

0.1µF

0.1µF

0.1µF

47µF

AMPLIFIER

REFIN

REFBUF

OPTIONAL

LOWPASS FILTER

IN+

IN–

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

applicaTions inForMaTion