1 MHz to 4 GHz, 80 dB

Logarithmic Detector/Controller

Data Sheet

ADL5513

Rev. A

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FEATURES

Wide bandwidth: 1 MHz to 4 GHz

80 dB dynamic range (±3 dB)

Constant dynamic range over frequency

Sensitivity: −70 dBm

Low noise measurement/controller output (VOUT)

Pulse response time: 21 ns/20 ns (fall/rise)

Single-supply operation: 2.7 V to 5.5 V at 31 mA

Power-down feature: 1 mW at 5 V

Small footprint LFCSP

Fabricated using high speed SiGe process

APPLICATIONS

RF transmitter power amplifier linearization and gain/power

control

Power monitoring in radio link transmitters

RSSI measurement in base stations, WLAN, WiMAX, RADAR

FUNCTIONAL BLOCK DIAGRAM

2

1

4

3

I

V

I

V

DET

DET

DET

DET

DET

SLOPE

CONTROL

GAIN

BIAS

BAND GAP

REFERENCE

12

11

10

9

13

14

15

16

8

7

6

5

ADL5513

VOUT

VSET

COMM

TADJ

INHI

INLO

VPOS

VPOS

NC

NC

CLPF

NC

NC

NC

NC

NC

Figure 1.

GENERAL DESCRIPTION

The ADL5513 is a demodulating logarithmic amplifier, capable

of accurately converting an RF input signal to a corresponding

decibel-scaled output. It employs the progressive compression

technique over a cascaded amplifier chain, each stage of which

is equipped with a detector cell. The device can be used in either

measurement or controller modes. The ADL5513 maintains

accurate log conformance for signals up to 4 GHz. The input

dynamic range is typically 80 dB (referred to 50 Ω) with error less

than ±3 dB and 74 dB with error less than ±1 dB. The ADL5513

has 20 ns response time that enables RF burst detection to a

pulse rate of beyond 50 MHz. The device provides unprecedented

logarithmic intercept stability vs. ambient temperature conditions.

A supply of 2.7 V to 5.5 V is required to power the device. Current

consumption is 31 mA, and it decreases to 200 μA when the

device is disabled.

The ADL5513 can be configured to provide a control voltage to

a power amplifier or a measurement output from the VOUT pin.

Because the output can be used for controller applications,

special attention has been paid to minimize wideband noise. In

this mode, the setpoint control voltage is applied to the VSET pin.

The feedback loop through an RF amplifier is closed via VOUT,

the output of which regulates the amplifier output to a magni-

tude corresponding to VSET. The ADL5513 provides 0 V to

for controller applications. As a measurement device, VOUT

is externally connected to VSET to produce an output voltage,

The logarithmic slope is 21 mV/dB, determined by the VSET

interface. The intercept is −88 dBm (referred to 50 Ω, conti-

nuous wave input, 900 MHz) using the INHI input. These

parameters are very stable against supply and temperature

variations.

The ADL5513 is fabricated on a SiGe bipolar IC process and

is available in a 3 mm × 3 mm, 16-lead LFCSP package for the

−40°C to +125°C operating temperature range. A fully populated

evaluation board is available.