ST RHF350 User Manual

RHF350

Rad-hard 550 MHz low noise operational amplifier

Preliminary data

Features

■ Bandwidth: 550 MHz (unity gain)

■ Quiescent current: 4.1 mA

■ Slew rate: 940 V/µs

■ Input noise: 1.5 nV/√ Hz

■ Distortion: SFDR = -66 dBc (10 MHz, 1V

■ 2.8 V

minimum output swing on 100 Ω load

pp

for a +5 V supply

■ 5 V power supply

■ 300 krad MIL-STD-883 1019.7 ELDRS free

pp

NC

IN -

)

IN +

-VCC

Pin connections

(top view)

1

4

compliant

■ SEL immune at 125° C, LET up to

110 MEV.cm²/mg

■ SET characterized, LET up to

The upper metallic lid is not electrically connected to any

pins, nor to the IC die inside the package.

110 MEV.cm²/mg

■ QMLV qualified under SMD 5962-0723201

■ Mass: 0.45 g

Description

The RHF350 is a current feedback operational

Applications

■ Communication satellites

■ Space data acquisition systems

■ Aerospace instrumentation

■ Nuclear and high energy physics

■ Harsh radiation environments

■ ADC drivers

amplifier that uses very high speed
complementary technology to provide a
bandwidth of up to 410 MHz while drawing only

4.1 mA of quiescent current. With a slew rate of
940 V/µs and an output stage optimized for
driving a standard 100 Ω load, this circuit is highly
suitable for applications where speed and power­saving are the main requirements. The device is a
single operator available in a Flat-8 hermetic
ceramic package, saving board space as well as
providing excellent thermal and dynamic
performance.

Table 1. Device summary

Order code SMD pin Quality level Package

RHF350K1 - Engineering model Flat-8 Gold RHF350K1 -

RHF350K-01V 5962F0723201VXC QMLV-Flight Flat-8 Gold 5962F0723201VXC -

Lead

finish

Marking EPPL Packing

8

NC

+VCC

OUT

NC

5

Strip pack

Note: Contact your ST sales office for information on the specific conditions for products in QML-Q versions.

July 2011 Doc ID 15604 Rev 3 1/20

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.

www.st.com

20

Contents RHF350

Contents

1 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3

2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Power supply considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.1 Single power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4 Noise measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.1 Measurement of the input voltage noise eN . . . . . . . . . . . . . . . . . . . . . . . 13

4.2 Measurement of the negative input current noise iNn . . . . . . . . . . . . . . . 13

4.3 Measurement of the positive input current noise iNp . . . . . . . . . . . . . . . . 13

5 Intermodulation distortion product . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6 Inverting amplifier biasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

7 Active filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

8 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

8.1 Ceramic Flat-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2/20 Doc ID 15604 Rev 3

RHF350 Absolute maximum ratings and operating conditions

1 Absolute maximum ratings and operating conditions

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

V

T

T

R

R

P

Supply voltage

CC

V

Differential input voltage

id

Input voltage range

V

in

Operating free-air temperature range -40 to + 85 °C

oper

Storage temperature -65 to +150 °C

stg

Maximum junction temperature 150 °C

T

j

Flat-8 thermal resistance junction to ambient 50 °C/W

thja

Flat-8 thermal resistance junction to case 30 °C/W

thjc

Flat-8 maximum power dissipation

max

= 150° C

T

j

HBM: human body model

pins 1, 4, 5, 6, 7 and 8
pins 2 and 3

MM: machine model

ESD

pins 1, 4, 5, 6, 7 and 8
pins 2 and 3

CDM: charged device model

pins 1, 4, 5, 6, 7 and 8
pins 2 and 3

Latch-up immunity 200 mA

1. All voltages values are measured with respect to the ground pin.

2. Differential voltage are non-inverting input terminal with respect to the inverting input terminal.

3. The magnitude of input and output voltage must never exceed VCC +0.3 V.

4. Short-circuits can cause excessive heating. Destructive dissipation can result from short-circuits on all
amplifiers.

5. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a

1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations
while the other pins are floating.

6. This is a minimum value.
Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between
two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of
connected pin combinations while the other pins are floating.

7. Charged device model: all pins and package are charged together to the specified voltage and then
discharged directly to the ground through only one pin.

(1)

(3)

(6)

6V

(2)

+/-0.5 V

+/-2.5 V

(4)

(T

= 25° C) for

(5)

amb

830 mW

2

kV

0.5

200

V

60

(7)

1.5

kV

1.5

Table 3. Operating conditions

Symbol Parameter Value Unit

V

V

Supply voltage 4.5 to 5.5 V

CC

+1.5 V to

-V

Common mode input voltage

icm

+V

CC

CC

-1.5 V

V

Doc ID 15604 Rev 3 3/20

Electrical characteristics RHF350

2 Electrical characteristics

Table 4. Electrical characteristics for VCC = ±2.5 V, (unless otherwise specified)

Symbol Parameter Test conditions

Temp.

(1)

Min. Typ. Max. Unit

DC performance

+125°C TBD TBD

V

Input offset voltage

io

-55°C TBD TBD

+125°C TBD

I

ib+

Non-inverting input bias
current

-55°C TBD

+125°C TBD

I

Inverting input bias current

ib-

-55°C TBD

+125°C TBD

CMR

Common mode rejection ratio
20 log (ΔV

/ΔVio)

ic

ΔV

= ±1 V

ic

-55°C TBD

+125°C 67

SVR

Supply voltage rejection ratio
20 log (ΔV

CC

/ΔV

out

)

ΔV

= 3.5 V to 5 V

CC

-55°C 67

PSRR

Power supply rejection ratio

/ΔV

20 log (ΔV

CC

out

)

ΔV

=200mVpp at 1 kHz +25°C 51 dB

CC

+125°C TBD

I

CC

Supply current No load

-55°C TBD

mV+25°C 0.35 0.8 4

μA+25°C 12 35

μA+25°C 1 20

dB+25°C 54 60

dB+25°C 68 81

mA+25°C 4.1 4.9

Dynamic performance and output characteristics

ΔV

= ±1 V,

R

Bw Small signal -3 dB bandwidth

Transimpedance

OL

out

= 1k Ω

R

L

= 100 Ω, AV = +1 +25°C 550

R

L

= 100 Ω, AV = +2 +25°C 390

R

L

R

= 100 Ω, AV = +10 +25°C 125

L

R

= 100 Ω, AV = -2

L

4/20 Doc ID 15604 Rev 3

+125°C TBD

kΩ+25°C 170 270

-55°C TBD

MHz

+125°C TBD

+25°C 250 370

-55°C TBD

RHF350 Electrical characteristics

Table 4. Electrical characteristics for VCC = ±2.5 V, (unless otherwise specified) (continued)

Symbol Parameter Test conditions

V

= 2 Vpp,

SR Slew rate

out

AV = +2, RL = 100 Ω

Temp.

(1)

Min. Typ. Max. Unit

+25°C 940 V/μs

+125°C 1.5

V

High level output voltage RL = 100 Ω

OH

+25°C 1.55 1.65

-55°C 1.5

1. T

< T

< T

min

amb

done on 50 units in the SO-8 plastic package.

Table 5. Closed-loop gain and feedback components

: worst case of the parameter on a standard sample across the temperature range. The evaluation is

max

Gain (V/V) + 1 - 1 + 2 - 2 + 10 - 10

R

(Ω) 820 300 300 300 300 300

fb

V

Doc ID 15604 Rev 3 5/20

Electrical characteristics RHF350

Figure 1. Frequency response, positive gain Figure 2. Flatness, gain = +1

25

20

Gain=+10, Rfb=300Ω, Rg=33

15

10

Gain=+4, Rfb=300Ω, Rg=100

5

Gain=+2, Rfb=300Ω, Rg=300

0

Gain=+1, Rfb=820

-5

Gain (dB)

-10

-15

-20

Small Signal
Vcc=+5V

-25

-30
1M 10M 100M 1G

Load=100

Ω

Ω

Ω

Ω

Ω

Frequency (Hz)

0.4

0.2

0.0

Gain (dB)

-0.2

Small Signal
Vcc=+5V
Gain=+1

-0.4

1M 10M 100M 1G

Load=100

Ω

Frequency (Hz)

Figure 3. Flatness, gain = +2 Figure 4. Flatness, gain = +4

6.4

6.2

12.2

12.0

6.0

Gain (dB)

5.8

Small Signal
Vcc=+5V
Gain=+2

5.6

1M 10M 100M 1G

Load=100

Ω

11.8

Gain (dB)

11.6

Small Signal
Vcc=+5V
Gain=+4

11.4

Load=100

1M 10M 100M 1G

Frequency (Hz)

Figure 5. Flatness, gain = +10 Figure 6. Slew rate

20.2

20.0

19.8

Small Signal
Vcc=+5V
Gain=+10
Load=100

Ω

Gain (dB)

19.6

19.4

1M 10M 100M 1G

Frequency (Hz)

1.50

1.25

1.00

0.75

0.50

Output Response (V)

0.25

0.00

-2ns -1ns 0s 1ns 2ns

Gain=+2
Vcc=+5V
Load=100

Ω

Frequency (Hz)

Ω

Time (ns)

6/20 Doc ID 15604 Rev 3