ST RHF310 User Manual

RHF310

Rad-hard 400 µA high-speed operational amplifier

Preliminary data

Features

■ OptimWatt

consumption and low 400 μA quiescent
current

Bandwidth: 120 MHz (gain = 2)

■

■ Slew rate: 115 V/μs

■ Specified on 1 kΩ

■ Input noise: 7.5 nV/√ Hz

■ Tested with 5 V power supply

■ 300 krad MIL-STD-883 1019.7 ELDRS free

compliant

■ SEL immune at 125° C, LET up to

110 MEV.cm

■ SET characterized, LET up to

110 MEV.cm

■ QMLV qualified under SMD 5962-0723301

■ Mass: 0.45 g

TM

device featuring ultra-low 2 mW

(a)

2

/mg

2

/mg

Applications

■ Low-power, high-speed systems

■ Communication and space equipment

■ Harsh radiation environments

■ ADC drivers

Table 1. Device summary

Pin connections

(top view)

1

NC

IN -

IN +

-VCC

4

The upper metallic lid is not electrically connected to any

pins, nor to the IC die inside the package.

8

NC

+VCC

OUT

NC

5

Description

The RHF310 is a very low power, high-speed
operational amplifier. A bandwidth of 120 MHz is
achieved while drawing only 400 µA of quiescent
current. This low-power characteristic is
particularly suitable for high-speed battery
powered devices requiring dynamic performance.
The RHF310 is a single operator available in a
Flat-8 package, saving board space as well as
providing excellent thermal performance.

Order code SMD pin

RHF310K1 -

Quality

level

Engineering

model

Package

Flat-8 Gold RHF310K1 -

Lead

finish

Marking EPPL Packing

RHF310K-01V 5962F0723301VXC QMLV-Flight Flat-8 Gold 5962F0723101VXC -

Note: Contact your ST sales office for information on the specific conditions for products in die form and

QML-Q versions.

a. OptimWattTM is an STMIcroelectronics registered trademark that applies to products with specific features that optimize

energy efficiency.

July 2011 Doc ID 15577 Rev 3 1/22

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

Strip pack

www.st.com

22

Contents RHF310

Contents

1 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 4

2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3 Power supply considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.1 Single power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4 Noise measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.1 Measurement of the input voltage noise eN . . . . . . . . . . . . . . . . . . . . . . . 14

4.2 Measurement of the negative input current noise iNn . . . . . . . . . . . . . . . 14

4.3 Measurement of the positive input current noise iNp . . . . . . . . . . . . . . . . 14

5 Intermodulation distortion product . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6 Bias of an inverting amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

7 Active filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

8 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

8.1 Ceramic Flat-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

2/22 Doc ID 15577 Rev 3

RHF310 List of figures

List of figures

Figure 1. Frequency response, positive gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 2. Frequency response vs. capa-load. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 3. Output amplitude vs. load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 4. Input voltage noise vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 5. Distortion at 1 MHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 6. Distortion at 10 MHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 7. Positive slew rate on 1 kW load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 8. Negative slew rate on 1 kW load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 9. Quiescent current vs. V
Figure 10. I
Figure 11. I

sink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

source. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 12. Bandwidth vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 13. CMR vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 14. SVR vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 15. Slew rate vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 16. R
Figure 17. I
Figure 18. V
Figure 19. V
Figure 20. I
Figure 21. I

vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

OL

vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

bias

vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

io

and VOL vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

OH

vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

out

vs. temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

CC

Figure 22. Circuit for power supply bypassing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 23. Circuit for +5 V single supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 24. Noise model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 25. Inverting summing amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 26. Compensation of the input bias current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 27. Low-pass active filtering, Sallen-Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 28. Ceramic Flat-8 package mechanical drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

CC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Doc ID 15577 Rev 3 3/22

Absolute maximum ratings and operating conditions RHF310

1 Absolute maximum ratings and operating conditions

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

V

V

V

T

R

R

P

Supply voltage

CC

(voltage difference between -VCC and +VCC pins)

Differential input voltage

id

Input voltage range

in

Storage temperature -65 to +150 °C

stg

Maximum junction temperature 150 °C

T

j

Thermal resistance junction to ambient area 50 °C/W

thja

Thermal resistance junction to case 40 °C/W

thjc

Maximum power dissipation

max

for T

=150°C

j

HBM: human body model

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

ESD

MM: machine model

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

CDM: charged device model (all pins)

Latch-up immunity 200 mA

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

2. Differential voltage is the 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 circuit on
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 ground through only one pin. This is done for all pins.

Table 3. Operating conditions

(1)

(3)

(6)

(2)

(5)

(4)

(at T

amb

(7)

=25°C)

6V

±0.5 V

±2.5 V

830 mW

2

kV

0.5

200

V

60

1.5 kV

Symbol Parameter Value Unit

V

V

T

1. Tj must never exceed +150°C. P = (Tj - T
must dissipate in the application.

Supply voltage 4.5 to 5.5 V

CC

Common-mode input voltage

icm

Operating free-air temperature range

amb

4/22 Doc ID 15577 Rev 3

amb

/ R

(1)

= (Tj - T

thja

case

+1.5 V to

-V

CC

-1.5 V

+V

CC

-55 to +125 °C

) / R

with P the power that the RHF310

thjc

V

RHF310 Electrical characteristics

2 Electrical characteristics

Table 4. Electrical characteristics for VCC = ±2.5 V, T

amb

= 25° C

(unless otherwise specified)

Symbol Parameter Test conditions Min. Typ. Max. Unit

DC performance

+125°C -6.5 +6.5

V

Input offset voltage

io

-55°C -6.5 +6.5

+125°C 15

Non-inverting input bias current

I

ib+

-55°C 15

+125°C 7

Inverting input bias current

I

ib-

-55°C 7

+125°C 55

CMR

SVR

Common mode rejection ratio
20 log (ΔV

/ΔVio)

ic

Supply voltage rejection ratio

/ΔV

20 log (ΔV

CC

out

)

ΔVic = ±1 V

-55°C 55

+125°C 50

ΔVCC= 3.5V to 5V

-55°C 50

mV+25°C -6.5 1.7 +6.5

μA+25°C 3.1 12

μA+25°C 0.1 5

dB+25°C 57 61

dB+25°C 65 82

PSRR

I

Power supply rejection ratio
20 log (ΔVCC/ΔV

Supply current No load

CC

out

)

Dynamic performance and output characteristics

R

Transimpedance

OL

Small signal -3 dB bandwidth on
1k Ω load

Bw

Gain flatness at 0.1 dB

=200mVpp at

ΔV

CC

1kHz

+25°C 50 dB

+125°C 600

µA+25°C 400 530

-55°C 600

+125°C 500

ΔV

= ±1 V,

out

RL = 1 kΩ

kΩ+25°C 600 1450

-55°C 500

Rfb = 3 kΩ, AV = +1 +25°C 230

R

= 510 Ω, AV = +10 +25°C 26

fb

+125°C 70

Rfb = 3 kΩ, AV = +2

+25°C 70 120

MHz

-55°C 70

=20mV

V

out

AV = +2, RL = 1k Ω

pp

+25°C 25

Doc ID 15577 Rev 3 5/22

Electrical characteristics RHF310

Table 4. Electrical characteristics for VCC = ±2.5 V, T

amb

= 25° C

(unless otherwise specified) (continued)

Symbol Parameter Test conditions Min. Typ. Max. Unit

= 2 Vpp,

V

SR Slew rate

V

V

High level output voltage RL = 100 Ω

OH

Low level output voltage RL = 100 Ω

OL

(1)

I

sink

I

out

(2)

I

source

Output to GND

Noise and distortion

eN Equivalent input noise voltage

(3)

out

= +2, RL = 100 Ω

A

V

+25°C 115 V/μs

+125°C 1.5

+25°C 1.55 1.65

-55°C 1.5

+125°C -1.5

+25°C -1.66 -1.55

-55°C -1.5

+125°C 70

Output to GND

+25°C 70 110

-55°C 70

+125°C 60

+25°C 60 100

-55°C 60

F = 100 kHz +25°C 7.5 nV/√ Hz

V

V

mA

Equivalent positive input noise

(3)

current

F = 100 kHz +25°C 13 pA/√ Hz

iN

Equivalent negative input noise

(3)

current

F = 100 kHz +25°C 6 pA/√ Hz

AV = +2, V
RL = 100 Ω

SFDR Spurious free dynamic range

F = 1 MHz +25°C -87

F = 10 MHz +25°C -55

1. See Figure 10 for more details.

2. See Figure 11 for more details.

3. See Chapter 5 on page 15.

Table 5. Closed-loop gain and feedback components

Gain (V/V) + 2 - 2 + 4 - 4 + 10 - 10

(Ω) 1.2k 1k 150 300 100 180

R

fb

= 2 Vpp,

out

+25°C

dBc

6/22 Doc ID 15577 Rev 3

RHF310 Electrical characteristics

01234

-80

-70

-60

-50

-40

-30

-20

-10

0

H2

H3

Vcc=5V
F=10MHz
Load=1k

Ω

H2 and H3 (dBc)

Output (Vp-p)

Figure 1. Frequency response, positive gain Figure 2. Frequency response vs. capa-load

24
22
20
18
16
14
12
10

8
6
4

Gain (dB)

2
0

-2

-4

Small Signal

-6

Vcc=5V

-8

-10
1M 10M 100M

Load=1k

Ω

Gain=+10

Gain=+4

Gain=+2

Gain=+1

Frequency (Hz)

10

8

C-Load=10pF
R-iso=33 ohms

6

4

R-iso

R-iso

C-Load

C-Load

C-Load=22pF
R-iso=47ohms

Vout

Vout

1k

1k

2

0

Vin

Vin

+

-2

Gain (dB)

-4

+

-

-

3k

3k

3k

3k

-6

Gain=+2, Vcc=5V,

Gain=+2, Vcc=5V,

-8

Small Sig nal

Small Sig nal

-10
1M 10M 100M

Frequency (Hz)

C-Load=4.7pF
R-iso=0

Figure 3. Output amplitude vs. load Figure 4. Input voltage noise vs. frequency

4.0

3.5

Gain=32dB
Rg=12ohms
Rfb=510ohms
non-inverting input in short-circuit
Vcc=5V

3.0

2.5

Max output amplitude (Vp-p)

2.0
10 100 1k 10k 100k

Load (ohms)

Figure 5. Distortion at 1 MHz Figure 6. Distortion at 10 MHz

-20

Vcc=5V

-30

F=1MHz

Ω

Load=1k

-40

-50

-60

-70

H2

H2 and H3 (dBc)

-80

-90

-100
01234

H3

Output (Vp-p)

Doc ID 15577 Rev 3 7/22