THS4524MDBTREP datasheet(28/48 Pages) NSC

28 / 48 page

THS452x

S-

OCM

IN+

Optional;

installedto

balance

impedanceseen

at V

IN+

OCM Control

PD Control

OUT-

OUT+

S+

0.22 F

S+

OCM

S-

100kW

EXT

Tointernal

circuit

OCM

EXT

V )

50k

OCM

S+

S-

THS4524-EP

SBOS609A – JUNE 2012 – REVISED AUGUST 2013

www.ti.com

Figure 63 represents the VOCM input. The internal

Single-Supply Operation

VOCM circuit has typically 23 MHz of –3 dB bandwidth,

To facilitate testing with common lab equipment, the

which is required for best performance, but it is

THS4524EVM allows for split-supply operation; most

intended to be a dc bias input pin. A 0.22-

μF bypass

of the characterization data presented in this data

capacitor is recommended on this pin to reduce

sheet is measured using split-supply power inputs.

noise. The external current required to overdrive the

The device can easily be used with a single-supply

internal resistor divider is given approximately by the

power input without degrading performance.

formula in Equation 2:

Figure 64 shows a dc-coupled single-supply circuit

with single-ended inputs. This circuit can also be

applied to differential input sources.

where:

•

VOCM is the voltage applied to the VOCM pin

(2)

Figure 63. VOCM Input Circuit

Typical Performance Variation with Supply

Voltage

Figure 64. THS4524 DC-Coupled Single-Supply

with Single-Ended Inputs

The THS4524 provides excellent performance across

the specified power-supply range of 2.5 V to 5.5 V

The input common-mode voltage range of the

with only minor variations. The input and output

THS4524 is designed to include the negative supply

voltage compliance ranges track with the power

voltage. in the circuit shown in Figure 64, the signal

supply in nearly a 1:1 correlation. Other changes can

source is referenced to ground. VOCM is set by an

be observed in slew rate, output current drive, open-

external control source or, if left unconnected, the

loop gain, bandwidth, and distortion. Table 3 shows

internal circuit defaults to midsupply. Together with

the typical variation to be expected in these key

the input impedance of the amplifier circuit, RIT

performance parameters.

provides input termination, which is also referenced to

ground.

Note that RIT and optional matching components are

added

the

alternate

input

balance

the

impedance at signal input.

Table 3. 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

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

xxxSecond harmonic

–85 dBc

–84 dBc

xxxThird harmonic

–91 dBc

–90 dBc

–88 dBc

Open-loop gain

119 dB

116 dB

115 dB

Linear output current drive

55 mA

35 mA

24 mA

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