THS4521 datasheet(18/66 Pages) TI2

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6.9 Typical Characteristics: 3-V to 5-V Supply Range (continued)

at Vs+ = 3 V and 5 V, Vs– = GND, Vocm is open, 50-Ω single-ended input to differential output, gain = 2 V/V, Rload = 500 Ω,

and TA ≈ 25°C (unless otherwise noted)

Frequency (MHz)

100

1000

-4

-3.5

-3

-2.5

-2

-1.5

-1

-0.5

0.5

D043

+5 V, 100 mVpp

+5 V, 1 Vpp

+3 V, 100 mVpp

+3 V, 1 Vpp

Figure 6-43. Common-Mode, Small- and Large-Signal Response

(Vocm pin driven)

Time (ns)

1.25

1.5

1.75

2.25

2.5

2.75

3 V Small Signal

3 V Large Signal

5 V Small Signal

5 V Large Signal

D044

Figure 6-44. Common-Mode, Small- and Large-Step Response

(Vocm pin driven)

Frequency (Hz)

100

1000

100

10k

100k

10M

D045

+5 V Vocm driven

+5 V Vocm floating

+3 V Vocm driven

+3 V Vocm floating

Vocm input either driven to mid-supply by low impedance

source, or allowed to float and default to mid-supply

Figure 6-45. Output Common-Mode Noise

Vocm Input Voltage (V)

0.8

1.2

1.6

2.4

2.8

3.2

3.6

-10

-8

-6

-4

-2

D046

+5 V supply

+3 V supply

Average Vocm output offset of 37 units, Standard deviation

< 2.5 mV, see Figure 7-3

Figure 6-46. Vocm Offset vs Vocm Setting

Vocm (V)

0.85

1.35

1.85

2.35

2.85

3.35

3.85

100

D047

+3 V supply

+5 V supply

Single-ended to differential gain of 2 (see Figure 7-1), PSRR

for negative supply to differential output (1-kHz simulation)

Figure 6-47. –PSRR vs Vocm Approaching Vs–

Vocm (V)

0.85

1.35

1.85

2.35

2.85

3.35

3.85

100

D048

+3 V supply

+5 V supply

Single-ended to differential gain of 2 (see Figure 7-1), PSRR

for positive supply to differential output (1-kHz simulation)

Figure 6-48. +PSRR vs Vocm Approaching Vs+

THS4541

SLOS375B – AUGUST 2014 – REVISED FEBRUARY 2024

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