Data Sheet

ADRF6520

Rev. 0 | Page 7 of 29

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

24 OPP1

23 OPM1

22 COM

21 VGN1

20 VGN2

19 COM

18 OPM2

17 OPP2

1

2

3

4

5

6

7

8

INP1

INM1

COM

CFLT1

CFLT2

COM

INM2

INP2

ADRF6520

TOP VIEW

(Not to Scale)

NOTES

1. EXPOSED PAD. CONNECT THE EXPOSED

PAD TO A LOW IMPEDANCE GROUND PAD.

Figure 2. Pin Configuration

Table 4. Pin Function Descriptions

Pin No.

Mnemonic

Description

1, 2

INP1, INM1

Channel 1 Differential Inputs, 100 Ω Differential Input Impedance.

3, 6, 19, 22

COM

Analog Common. Connect COM to an external circuit common using the lowest possible impedance.

4, 5

CFLT1, CFLT2

Averaging Capacitors for RMS Detectors. The user can leave these pins open for the fastest response time

and the least amount of rms averaging.

7, 8

INM2, INP2

Channel 2 Differential Inputs, 100 Ω Differential Input Impedance.

9

RST

SPI Reset to Default Bit Values. This pin is active low. Pull the pin high under nonactive conditions. The

10

SCLK

11

SDIO

12, 13, 28, 29

VPS

Analog Positive Supply Voltage: 3.15 V to 3.45 V.

15, 26

CHP2, CHP1

DC Offset Correction Loop Capacitors. Connect the capacitors to a circuit common.

16

VRMS

RMS Detector Output. The output transfer function is 1 V/V rms × (CH1_RMS + CH2_RMS), where CH1_RMS

is the differential rms voltage of the input of the Channel 1 filter, and CH2_RMS is the differential rms

voltage of the input of the Channel 2 filter. The user can leave the pin open if not using the rms detector;

there is no need to terminate this pin. Load this pin with at least 1 kΩ to ground; values lower than this

prevent the detector output from reaching its full-scale value.

17, 18

OPP2, OPM2

Channel 2 Differential Outputs. These outputs have a 20 Ω differential output impedance.

20, 21

VGN2, VGN1

VGA2 and VGA1 Analog Gain Control. These pins operate from 0 V to 1.5 V with 30 mV/dB gain scaling.

23, 24

OPM1, OPP1

Channel 2 Differential Outputs. These outputs have a 20 Ω differential output impedance.

25

ENBL

Chip Enable. Pull this pin high to enable the chip. Voltages on ENBL of less than 1.6 V disable the device.

30

COMD

Digital Common. Connect this pin to an external circuit common using the lowest possible impedance.

31

VPSD

Digital Positive Supply Voltage: 3.15 V to 3.45 V.

32

CS

Chip Select Bar to Enable SPI Programming. CS is an SPI programming pin and is active low. The TTL levels

EP

Exposed Ground Pad. Connect the exposed pad to a low impedance ground pad.