AD8349

Rev. 0 | Page 6 of 28

PIN CONFIGURATION AND FUNCTIONAL DESCRIPTIONS

AD8349

TOP VIEW

(Not to Scale)

IBBP

1

IBBN

2

COM1

3

COM1

4

LOIN

5

QBBP

QBBN

COM3

COM3

VPS2

15

14

13

12

LOIP

6

VPS1

7

ENOP

8

VOUT

COM3

COM2

11

10

9

16

Figure 2

Table 3. Pin Function Descriptions

Pin No.

Mnemonic

Description

Equivalent

Circuit

1, 2,

15, 16

IBBP, IBBN,

QBBN, QBBP

Differential In-Phase and Quadrature Baseband Inputs. These high impedance inputs must be

dc-biased to approximately 400 mV dc, and must be driven from a low impedance source.

Nominal characterized ac signal swing is 600 mV p-p on each pin (100 mV to 700 mV). This

results in a differential drive of 1.2 V p-p with a 400 mV dc bias. These inputs are not self-biased

and must be externally biased.

Circuit A

3, 4

COM1

Common Pin for LO Phase Splitter and LO Buffers. COM1, COM2, and COM3 should all be

connected to a ground plane via a low impedance path.

5, 6

LOIN, LOIP

Pins must be ac-coupled. Single-ended drive is possible with degradation in performance.

Circuit B

7

VPS1

Positive Supply Voltage (4.75 V to 5.25 V) for the LO Bias-Cell and Buffer. VPS1 and VPS2 should

be connected to the same supply. To ensure adequate external bypassing, connect 0.1 µF and

100 pF capacitors between VPS1 and ground.

8

ENOP

Output Enable. This pin can be used to enable or disable the RF output. Connect to high logic

level for normal operation. Connect to low logic level to disable output.

Circuit C

9

COM2

Common Pin for the Output Amplifier. COM1, COM2, and COM3 should all be connected to a

ground plane via a low impedance path.

10, 13,

14

COM3

Common Pin for Input V-to-I Converters and Mixer Cores. COM1, COM2, and COM3 should all

be connected to a ground plane via a low impedance path.

11

VOUT

Device Output. Single-ended, 50 Ω internally biased RF output. Pin must be ac-coupled to the

load.

Circuit D

12

VPS2

Positive Supply Voltage (4.75 V to 5.25 V) for the Baseband Input V-to-I Converters, Mixer Core,

Band Gap Reference, and Output Amplifer. VPS1 and VPS2 should be connected to the same

supply. To ensure adequate external bypassing, connect 0.1 µF and 100 pF capacitors between

VPS2 and ground.