Data Sheet

HMC558A

Rev. 0 | Page 5 of 15

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

HMC558A

TOP VIEW

(Not to Scale)

9

8

7

GND

RF

GND

1

2

3

GND

LO

GND

45

6

12

11

10

NOTES

1. NIC = NO INTERNAL CONNECTION.

2. EXPOSED PAD. CONNECT THE EXPOSED PAD TO A LOW

IMPEDANCE THERMAL AND ELECTRICAL GROUND PLANE.

Figure 2. Pin Configuration

Table 4. Pin Function Descriptions

Pin No.

Mnemonic

Description

1, 3, 4, 6, 7, 9

GND

Ground. See Figure 6 for the ground interface schematic.

2

LO

Local Oscillator Port. This pin is ac-coupled and matched to 50 Ω. See Figure 4 for the LO interface schematic.

5

IF

DC-Coupled IF. For applications not requiring operation to dc, dc block this port externally using a series

capacitor whose value is chosen to pass the necessary IF frequency range. For operation to dc, this pin

must not source or sink more than 3 mA of current, or device nonfunction and possible device failure may

result. See Figure 5 for the IF interface schematic.

8

RF

RF Port. This pin is ac-coupled internally and matched to 50 Ω. See Figure 3 for the RF interface schematic.

10, 11, 12

NIC

No Internal Connection. These pins can be grounded.

EPAD

Exposed Pad. Connect the exposed pad to a low impedance thermal and electrical ground plane.

INTERFACE SCHEMATICS

RF

Figure 3. RF Interface

LO

Figure 4. LO Interface

IF

Figure 5. IF Interface

GND

Figure 6. Ground Interface