AD8345
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
IBBP
IBBN
COM3
COM1
LOIN
LOIP
VPS1
ENBL
1
2
3
4
5
6
7
8
16
QBBP
15
QBBN
14
COM3
AD8345
TOP VIEW
(Not to Scale)
13
COM3
12
VPS2
11
VOUT
10
COM2
9
COM3
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
1, 2
Mnemonic
IBBP, IBBN
Description
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.
Ground Pin for Input V-to-I Converters and Mixer Core.
Ground Pin for the LO Phase Splitter and LO Buffers.
Differential LO Drive Pins. Internal dc bias (approximately 1.8 V @ V
S
= 5 V) is supplied.
Pins must be ac-coupled. Single-ended or differential drive is permissible.
Power Supply Pin for the Bias Cell and LO Buffers. This pin should be decoupled using
local 1000 pF and 0.01 μF capacitors.
Enable Pin. A high level enables the device; a low level puts the device in sleep mode.
Ground Pin for the Output Stage of Output Amplifier.
50 Ω DC-Coupled RF Output. Pin should be ac-coupled.
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.
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
3, 9, 13, 14
4
5, 6
7
8
10
11
12
15, 16
COM3
COM1
LOIN, LOIP
VPS1
ENBL
COM2
VOUT
VPS2
QBBN, QBBP
00932-002
Circuit B
Circuit C
Circuit D
Circuit A
Rev. B | Page 5 of 20
AD [ ANALOG DEVICES ]
