THS4521 datasheet(29/71 Pages) TI2

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THS452x

S-

OCM

IN+

Optional;

installedto

balance

impedanceseen

at V

IN+

OCM Control

PD Control

OUT-

OUT+

S+

0.22 F

THS4521, THS4522, THS4524

www.ti.com

SBOS458H – DECEMBER 2008 – REVISED JUNE 2015

Feature Description (continued)

8.3.6 Typical Performance Variation With Supply Voltage

The THS4521, THS4522, and THS4524 family of devices provide excellent performance across the specified

power-supply range of 2.5 V to 5.5 V with only minor variations. The input and output voltage compliance ranges

track with the power supply in nearly a 1:1 correlation. Other changes can be observed in slew rate, output

current drive, open-loop gain, bandwidth, and distortion. Table 6 shows the typical variation to be expected in

these key performance parameters.

8.3.7 Single-Supply Operation

To facilitate testing with common lab equipment, the THS4521EVM allows for split-supply operation; most of the

characterization data presented in this data sheet is measured using split-supply power inputs. The device can

easily be used with a single-supply power input without degrading performance.

Figure 61 shows a dc-coupled single-supply circuit with single-ended inputs. This circuit can also be applied to

differential input sources.

Figure 61. THS4521 DC-Coupled Single-Supply With Single-Ended Inputs

The input common-mode voltage range of the THS4521, THS4522, and THS4524 family is designed to include

the negative supply voltage. in the circuit shown in Figure 61, the signal source is referenced to ground. VOCM is

set by an external control source or, if left unconnected, the internal circuit defaults to midsupply. Together with

the input impedance of the amplifier circuit, RIT provides input termination, which is also referenced to ground.

Note that RIT and optional matching components are added to the alternate input to balance the impedance at

signal input.

Table 6. Typical Performance Variation Versus Power-Supply Voltage

PARAMETER

VS = 5 V

VS = 3.3 V

VS = 2.5 V

–3-dB Small-signal bandwidth

145 MHz

135 MHz

125 MHz

Slew rate (2-V step)

490 V/

μs

420 V/

μs

210 V/

μs

Second harmonic

–85 dBc

–84 dBc

Harmonic distortion at 1 MHz, 2 VPP, RL = 1 kΩ

Third harmonic

–91 dBc

–90 dBc

–88 dBc

Open-loop gain (dc)

119 dB

116 dB

115 dB

Linear output current drive

55 mA

35 mA

24 mA

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THS4521 Datasheet(PDF) 29 Page - Texas Instruments

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