AD8345(REV0) データシートの表示（PDF） - Analog Devices
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AD8345 Datasheet PDF : 16 Pages
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AD8345
Pin No.
1, 2
3, 9, 13, 14
4
5, 6
7
8
10
11
12
15, 16
PIN FUNCTION DESCRIPTIONS
Mnemonic
IBBP, IBBN
COM3
COM1
LOIN, LOIP
VPS1
ENBL
COM2
VOUT
VPS2
QBBN, QBBP
Function
Equivalent
Circuit
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.
Circuit A
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 @ VS = 5 V)
Circuit B
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. Circuit C
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
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 level of 1.2 V p-p. Inputs are not
self-biasing so external biasing circuitry must be used in ac-coupled applications.
Circuit D
Circuit A
EQUIVALENT CIRCUITS
VPS2
BUFFER
TO MIXER
CORE
INPUT
CURRENT
MIRROR
VPS2
ENBL
100k⍀
100k⍀
100k⍀
TO BIAS FOR
STARTUP/
SHUTDOWN
Circuit A
VPS1
LOIN
LOIP
PHASE
SPLITTER
CONTINUES
Circuit B
Figure 1. Equivalent Circuits
Circuit C
VPS2
40⍀
40⍀
VOUT
Circuit D
–4–
REV. 0
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