RHF1201_11 datasheet(23/34 Pages) STMICROELECTRONICS

23 / 34 page

RHF1201

Electrical characteristics (unchanged after 300 kRad)

Doc ID 12585 Rev 5

23/34

Figure 50.

Differential implementation using a balun

Figure 51.

Single-to-differential implementation with op-amps

With (Vout-diff) = (2R2/R1) x (Vin-single) and the following conditions on resistors:

R1/(R1+R2) = R3/(R3+R4) and R4/(R6+R4) = (R5+R2)/R1 (refer to the RHF310-330-350

datasheet for the choice of R2).

Some applications may require a single-ended input, which can easily be achieved with the

configuration shown in Figure 52. However, with this type of configuration a degradation in

the rated performance of the RHF1201 may occur, compared to a differential configuration.

To avoid this, a sufficiently decoupled DC reference should be used to bias the RHF1201

inputs. One may also use an AC-coupled analog input and set the DC analog level with a

high value resistor R (10 k

Ω to 100 kΩ) connected to a proper DC source.

AM04545

100 nF* ceramic

(as close as

possible to

INCM pin)

100 pF

ADT1 -1

1:1

Analog input signal

Ω track

Short track

470 nF* ceramic

(as close as possible

to the transformer)

External

INCM

(optional)

*the use of a ceramic technology is

preferable for a large bandwidth

stability of the capacitor

VIN

VINB

INCM

RHF1201

REFM

REFP

Ground

(50

Ω output)

AM06134

External INCM

(optional)

VIN

VINB

INCM

RHF1201

REFM

REFP

Ground

RHF310

RHF330

RHF350

Vin - single

GND

INCM

-Vinpp x R2/R1

GND

Riso

0 V

INCM

RHF310

RHF330

RHF350

Vinpp

+Vinpp x R2/R1

1 V

2 Vpp

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