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GNDDIG

VCCDIG

CHIP_EN

VCCMIX

NC

NC

NC

NC

NC

MIXinp

MIXinn

VCCMIX

1

2

3

4

5

6

7

8

9

10

11

12

25

26

27

28

29

30

31

32

33

34

35

36

VCCBBI

ADC_CM( 1.5V)

~

ADC_CM( 1.5V)

~

C1

0.1 F

m

C11

0.1 F

m

C12

0.1 F

m

C2

C8

C3

C6

1000pF

1000pF

10pF

10pF

10pF

10pF

10pF

0.1 F

m

AGND

BBIoutp

BBIoutn

LOip

LOin

NC

BBQoutp

BBQoutn

AGND

VCCBBQ

VCCLO

VCC

VCC

VCC

VCC

VCC

BBIN

BBQN

LON

U1

TRF3710

RFin

R1

30kW

To ADCQ

ToSYNTHESIZER

To ADCI

BBIP

BBQP

LOP

C10

VCC

VCC

CHIP_EN

10pF

C9

C5

LDB21

C4

C7

B1

ADC INTERFACE

TRF3710

SLWS199 – AUGUST 2007

Figure 36. TRF3710 Application Schematics

The RF input port and the RF LO port require differential input paths. Single ended RF inputs to these ports can

be converted with an RF balun that is centered at the band of interest. Linearity performance of the TRF3710 is

dependant on the amplitude and phase balance of the RF balun; hence, care should be taken with the selection

of the balun device and with the RF layout of the device. The recommended RF balun devices are listed in

Table 5.

Table 5. RF Balun Devices

MANUFACTURER

PART NUMBER

FREQUENCY RANGE (MHz)

UNBALANCE

BALANCE

IMPEDANCE

IMPEDANCE

Murata

LDB211G8005C-001

1800 ±100 MHz

50

Ω

50

Ω

Murata

LDB211G9005C-001

1900 ±100 MHz

50

Ω

50

Ω

The TRF3710 has an integrated ADC driver buffer that allows direct connection to an Analog-to-Digital Converter

(ADC) without additional active circuitry. The common mode voltage generated by the ADC can be directly

supplied to the TRF3710 through the VCMI/Q pins (pins 24, 37). Otherwise, a nominal common mode voltage of

1.5 V should be applied to those pins. The TRF3710 device can operate with a common mode voltage from 1.5

V to 2.8 V without any impairment to the output performance. Figure 37 illustrates the degradation of the output

compression point as the common mode voltage exceeds those values.

22

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