LTC1051/LTC1053

10

10513fa

SYSTEM BUSY, ONLY ABORT COMMANDS ALLOWED

RANGE: 11dBV

STATUS: PAUSED

20dBV

15dB

/DIV

–100

CENTER: 10 000Hz

X: 5475Hz

BW: 95.485Hz

Y: –58.05dBV

SPAN: 10 000Hz

68dB

–

+

1/2

LTC1051

1051/53 F07

R1

100Ω

R2

10k

10kHz

0.1µF

0.1µF

50pF

5V

–5V

1051/53 G08

01k 2k3k

4k

5k

6k 7k

8k 9k 10k

NEGATIVE SWING

POSITIVE SWING

10

9

8

7

6

5

4

3

2

1

0

INVERTING CLOSED-LOOP GAIN

1

100

10

1051/53 G09

90

80

70

60

50

40

30

20

10

5. For unity-gain inverting configuration, all the alias

frequencies are 80dB to 84dB down from the output signal

(Figures 6a, 6b). Combined with excellent THD under wide

swing, the LTC1051/LTC1053 op amps make efficient

unity gain inverters.

For gain higher than –1, the “signal to alias” ratio de-

creases at an approximate rate of –6dB per decade of

closed-loop gain (Figure 9).

6. For closed-loop gains of –10 or higher, the “signal to

alias” ratio degrades when the value of the feedback gain

setting resistor increases beyond 50k. For instance, the

68dB value of Figure 7 decreases to 56dB if a (1k, 100k)

resistor set is used to set the gain of –100.

7. When the LTC1051/LTC1053 are used as noninverting

amplifiers, all the previous approximate rules of thumb

apply with the following exceptions: when the closed-loop

gain is 10(V/V) and below, the “signal to alias” ratio is 1dB

to 3dB less than the inverting case; when the closed-loop

gain is 100(V/V), the degradation can be up to 9dB,

especially when the input signal is much higher than the

8. The signal/alias ratio performance improves when the

op amp has bandlimited loop gain.

Figure 7. Output Voltage Spectrum of 1/2 LTC1051 Operating as an Inverting Amplifier with a Gain of –100 and

was 75 Down from the 10kHz Input Signal

Figure 8. Output Voltage Swing vs Load

Figure 9. Signal to Alias Ratio vs

Closed-Loop Gain

APPLICATIO S I FOR ATIO