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SPT561AIJ

WIDEBAND, LOW DISTORTION DRIVER AMPLIFIER

Signal Processing Technologies 

WIDEBAND, LOW DISTORTION DRIVER AMPLIFIER

General Description

The SPT561 is a wideband DC coupled, amplifier that combines high

output drive and low distortion. At an output of +24dBm (10Vpp into

50Ω), the -3dB bandwidth is 150MHz. As illustrated in the table

below, distortion performance remains excellent even when amplify-

ing high-frequency signals to high output power levels.

With the output current internally limited to 250mA, the SPT561 is

fully protected against shorts to ground and can, with the addition of a

series limiting resistor at the output, withstand shorts to the ±15V

supplies.

The SPT561 has been designed for maximum flexibility in a wide

variety of demanding applications. The two resistors comprising the

feedback network set both the gain and the output impedance,

without requiring the series backmatch resistor needed by most op

amps. This allows driving into a matched load without dropping half

the voltage swing through a series matching resistor. External

compensation allows user adjustment of the frequency response.

The SPT561 is specified for both maximally flat frequency response

and 0% pulse overshoot compensations.

The combination of wide bandwidth, high output power, and low

distortion, coupled with gain, output impedance and frequency

response flexibility, makes the SPT561 ideal for waveform generator

applications. Excellent stability driving capacitive loads yields supe-

rior performance driving ADC’s, long transmission lines, and SAW

devices.

The SPT561 is constructed using thin film resistor/bipolar transistor

technology, and is available in the following versions:

SPT561AIJ -25°C to +85°C 24-pin Ceramic DIP

SPT561AMJ -55°C to +125°C 24-pin Ceramic DIP, features

burn-in and hermetic testing

Features

s 150MHz bandwidth at +24dBm output

s Low distortion (2nd/3rd:

-59/-62dBc @ 20MHz and 10dBm)

s Output short circuit protection

s User-definable output impedance, gain,

and compensation

s Internal current limiting

s Direct replacement for CLC561

Applications

s Output amplification

s Arbitrary waveform generation

s ATE systems

s Cable/line driving

s Function generators

s SAW drivers

s Flash A/D driving and testing

Frequency Response vs. Output Power

16

Po = 10dBm

14

Vo = 2Vpp

12

Po = 24dBm

Vo = 10Vpp

10

Po = 27.5dBm

Vo = 15Vpp

8

Po = 18dBm

Vo = 5Vpp

6

0

40

80

120

160

200

Frequency (MHz)

Block Diagram

Output

Power

10dBm

18dBm

24dBm

Typical Distortion Performance

20MHz

2nd 3rd

50MHz

2nd 3rd

100MHz

2nd 3rd

-59 -62 -52 -60 -35 -49

-52 -48 -45 -46 -30 -36

-50 -41 -36 -32 -40 -30

V+ 8

+

V- 18

-

5

10

15

20

4 +VCC

19 Compensation

23 Vo

21 -VCC

All undesignated

pins are internally

unconnected. May

be grounded if

desired.

4755 Forge Road, Colorado Springs, Colorado 80907, USA

Phone: (719) 528-2300 FAX: (719) 528-2370 Website: http://www.spt.com E-Mail: sales@spt.com

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