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AD8345-EVAL

140 MHz to 1000 MHz quadrature modulator

Analog Devices 

AD8345

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

IBBP 1

IBBN 2

COM3 3

COM1 4

LOIN 5

LOIP 6

VPS1 7

ENBL 8

AD8345

TOP VIEW

(Not to Scale)

16 QBBP

15 QBBN

14 COM3

13 COM3

12 VPS2

11 VOUT

10 COM2

9 COM3

Figure 2. Pin Configuration

Table 3. Pin Function Descriptions

Pin No. Mnemonic Description

1, 2

IBBP, IBBN I Channel Baseband Differential Input Pins. These high impedance inputs should be

dc-biased to approximately 0.7 V. Nominal characterized ac swing is 0.6 V p-p on each

pin (0.4 V to 1 V). This gives a differential drive of 1.2 V p-p. Inputs are not self-biasing, so

external biasing circuitry must be used in ac-coupled applications.

3, 9, 13, 14 COM3

Ground Pin for Input V-to-I Converters and Mixer Core.

4

COM1

Ground Pin for the LO Phase Splitter and LO Buffers.

5, 6

LOIN, LOIP Differential LO Drive Pins. Internal dc bias (approximately 1.8 V @ VS = 5 V) is supplied.

Pins must be ac-coupled. Single-ended or differential drive is permissible.

7

VPS1

Power Supply Pin for the Bias Cell and LO Buffers. This pin should be decoupled using

local 1000 pF and 0.01 μF capacitors.

8

ENBL

Enable Pin. A high level enables the device; a low level puts the device in sleep mode.

10

COM2

Ground Pin for the Output Stage of Output Amplifier.

11

VOUT

50 Ω DC-Coupled RF Output. Pin should be ac-coupled.

12

VPS2

Power Supply Pin for Baseband Input Voltage to Current Converters and Mixer Core.

This pin should be decoupled using local 1000 pF and 0.01 μF capacitors.

15, 16

QBBN, QBBP

Q Channel Baseband Differential Input Pins. Inputs should be dc-biased to approxi-

mately 0.7 V. Nominal characterized ac swing is 0.6 V p-p on each pin (0.4 V to 1 V). This

gives a differential drive level of 1.2 V p-p. Inputs are not self-biasing, so external biasing

circuitry must be used in ac-coupled applications.

Equivalent Circuit

Circuit A

Circuit B

Circuit C

Circuit D

Circuit A

Rev. B | Page 5 of 20

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