ADL5902

Data Sheet

Rev. B | Page 8 of 28

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

NOTES

1. NC = NO CONNECT.

2. THE EXPOSED PAD IS COMM AND SHOULD

HAVE BOTH A GOOD THERMAL AND GOOD

ELECTRICAL CONNECTION TO GROUND.

TADJ/PWDN

NC

VPOS

COMM

VREF

VTGT

VPOS

COMM

PIN 1

INDICATOR

12

11

10

1

3

49

2

ADL5902

TOP VIEW

(Not to Scale)

Figure 2. Pin Configuration

Table 3. Pin Function Descriptions

Pin No.

Mnemonic

Description

1

TADJ/PWDN

This is a dual function pin used for controlling the amount of nonlinear intercept temperature compensation at

voltages <2.5 V and/or for shutting down the device at voltages >4 V. If the shutdown function is not used, this pin

can be connected to the VREF pin through a voltage divider. See Figure 41 for an equivalent circuit.

2

NC

No Connect. Do not connect this pin.

3, 10

VPOS

Supply for the Device. Connect this pin to a 5 V power supply. Pin 3 and Pin 10 are not internally connected;

therefore, both must connect to the source.

4, 9, EPAD

COMM

System Common Connection. Connect these pins via low impedance to system common. The exposed paddle

is also COMM and must have both a good thermal and good electrical connection to ground.

5

CLPF

Connection for RMS Averaging Capacitor. Connect a ground-referenced capacitor to this pin. A resistor can be

connected in series with this capacitor to modify loop stability and response time. See Figure 43 for an

equivalent circuit.

6

VOUT

Output. In measurement mode, this pin is connected to VSET. In controller mode, this pin can drive a gain

control element. See Figure 43 for an equivalent circuit.

7

VSET

The voltage applied to this pin sets the decibel value of the required RF input voltage that results in zero

current flow in the loop integrating capacitor pin, CLPF. This pin controls the variable gain amplifier (VGA) gain

such that a 50 mV change in VSET changes the gain by approximately 1 dB. See Figure 42 for an equivalent circuit.

8

TEMP

Temperature Sensor Output of 1.4 V at 25°C with a Coefficient of 5 mV/°C. See Figure 38 for an equivalent circuit.

11

VREF

General-Purpose Reference Voltage Output of 2.3 V at 25°C. See Figure 39 for an equivalent circuit.

12

VTGT

The voltage applied to this pin determines the target power at the input of the RF squaring circuit. The intercept

voltage is proportional to the voltage applied to this pin. The use of a lower target voltage increases the crest

factor capacity; however, this can affect the system loop response. See Figure 44 for an equivalent circuit.

13

NC

No Connect. Do not connect this pin.

14

INHI

RF Input. The RF input signal is normally ac-coupled to this pin through a coupling capacitor. See Figure 37 for

an equivalent circuit.

15

INLO

RF Input Common. This pin is normally ac-coupled to ground through a coupling capacitor. See Figure 37 for

an equivalent circuit.

16

NC

No Connect. Do not connect this pin.