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20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373

Order On-line at www.hittite.com

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General Description

Features

Functional Diagram

The HMC600LP4(E) Logarithmic Detector/Controller

converts RF signals at its input, to a proportional DC

voltage at its output. The HMC600LP4(E) employs

a successive compression topology which delivers

extremely high dynamic range and conversion accuracy

over a wide input frequency range. As the input power

is increased, successive amplifiers move into saturation

one by one creating an accurate approximation of the

logarithm function. The output of a series of square law

detectors is summed, converted into voltage domain

and buffered to drive the LOGOUT output. For detection

mode, the LOGOUT pin is shorted to the VSET input,

and will provide a nominal logarithmic slope of 19mV/dB

and an intercept of -95 dBm. The HMC600LP4(E) can

also be used in the controller mode where an external

voltage is applied to the VSET pin, to create an AGC or

APC feedback loop.

Wide Dynamic Range: up to 75 dB

Flexible Supply Voltage: +2.7V to +5.5V

Power-Down Mode

Excellent Stability over Temperature

Compact 4x4mm Leadless SMT Package

Typical Applications

The HMC600LP4 / HMC600LP4E is ideal for IF and

RF applications in:

• Cellular/PCS/3G

• WiMAX, WiBro & Fixed Wireless

• Power Monitoring & Control Circuitry

• Receiver Signal Strength Indication (RSSI)

• Automatic Gain & Power Control

Parameter

Typ.

Typ.

Typ.

Typ.

Typ.

Typ.

Typ.

Typ.

Units

Input Frequency

50

100

500

900

1900

2500

3500

4000

MHz

±3 dB Dynamic Range

74

74

74

74

70

66

51

48

dB

±3 dB Dynamic Range Center

-30

-30

-30

-30.5

-31.0

-31.0

-27

-23.5

dBm

±1 dB Dynamic Range

64

64

64

65

62

59

44

41

dB

Output Slope

19.6

19.5

19.4

19.2

19.1

19.5

21.0

22.3

mV/dB

Output Intercept

-96

-96

-96

-96

-95

-93

-79

-72

dBm

-2.7

-2.8

-3.6

-4.8

-6.9

-7.4

-8.3

-12.9

mdB/°C

[1] Detector mode measurements; LOGOUT (Pin 17) is shorted to VSET (Pin 16).

Parameter

Conditions

Min.

Typ.

Max.

Units

RF Input (INP)

Return Loss

F = 50 - 4000 MHz, Zo = 50Ω, See plot

10

dB

LOGOUT Interface

Open Loop Impedance

16

kΩ

Current Drive (Source)

0.4

mA

75 dB LOGARITHMIC

DETECTOR / CONTROLLER 50 - 4000 MHz

v02.0909