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ADF4360-6 Scheda tecnica(PDF) 7 Page - Analog Devices

Il numero della parte ADF4360-6
Spiegazioni elettronici  50 MHz to 1000 MHz Quadrature Demodulator
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

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AD8348
Rev. A | Page 7 of 28
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
LOIP 1
LOIN
28
VPOS1 2
COM1
27
IOPN 3
QOPN
26
IOPP 4
QOPP
25
VCMO 5
ENVG
24
IAIN 6
QAIN
23
COM3 7
COM3
22
IMXO 8
QMXO
21
COM2 9
VPOS3
20
IFIN 10
MXIN
19
IFIP 11
MXIP
18
VPOS2 12
VGIN
17
IOFS 13
QOFS
16
VREF 14
ENBL
15
AD8348
TOP VIEW
(Not to Scale)
Figure 2. 28-Lead TSSOP Pin Configuration
Table 3. Pin Function Descriptions—28-Lead TSSOP
Pin No.
Mnemonic
Description
Equivalent
Circuit
1, 28
LOIP, LOIN
LO Inputs. For optimum performance, these inputs should be ac-coupled and driven
differentially. Differential drive from single-ended sources can be achieved via a balun.
To obtain a broadband 50 Ω input impedance, connect a 60.4 Ω shunt resistor between
LOIP and LOIN. Typical input drive level is equal to −10 dBm.
A
2, 12, 20
VPOS1, VPOS2,
VPOS3
Positive Supply for LO, IF, and Biasing and Baseband Sections, Respectively. These pins
should be decoupled with 0.1 μF and 100 pF capacitors.
3, 4, 25, 26
IOPN, IOPP,
QOPP, QOPN
I- and Q-Channel Differential Baseband Outputs. Typical output swing is equal to 2 V p-p
differential. The dc common-mode voltage level on these pins is set by the voltage on VCMO.
B
5
VCMO
Baseband DC Common-Mode Voltage. The voltage applied to this pin sets the dc
common-mode levels for all the baseband outputs and inputs (IMXO, QMXO, IOPP, IOPN,
QOPP, QOPN, IAIN, and QAIN). This pin can be connected either to VREF or to a reference
voltage from another device (typically an ADC).
C
6, 23
IAIN, QAIN
I- and Q-Channel Baseband Amplifier Inputs. The single-ended signals on these pins are
referenced to VCMO and must have a dc bias equal to the dc voltage on the VCMO pin. If
IMXO (QMXO) is dc-coupled to IAIN (QAIN), biasing will be provided by IMXO (QMXO). If
an ac-coupled filter is placed between IMXO and IAIN, these pins can be biased from the
source driving VCMO through a 1 kΩ resistor. The gain from IAIN/QAIN to the differential
outputs (IOPP/IOPN and QOPP/QOPN) is 20 dB.
D
7, 22
COM3
Ground for Biasing and Baseband Sections.
8, 21
IMXO, QMXO
I- and Q-Channel Mixer Baseband Outputs. These are low impedance (40 Ω) outputs whose
bias levels are set by the voltage applied to the VCMO pin. These pins are typically connected
to IAIN and QAIN, respectively, either directly or through a filter. Each output can drive a
maximum current of 2.5 mA.
H
9
COM2
IF Section Ground.
10, 11
IFIN, IFIP
IF Inputs. IFIN should be ac-coupled to ground. The single-ended IF input signal should
be ac-coupled into IFIP. The nominal differential input impedance of these pins is 200 Ω.
For a broadband 50 Ω input impedance, a minimum-loss L pad should be used; RSERIES = 174 Ω,
RSHUNT = 57.6 Ω. This provides a 200 Ω source impedance to the IF input. However, the AD8348
does not necessarily require a 200 Ω source impedance, and a single shunt 66.7 Ω resistor
can be placed between IFIP and IFIN.
E
13, 16
IOFS, QOFS
I- and Q-Channel Offset Nulling Inputs. DC offsets on the I-channel mixer output (IMXO)
can be nulled by connecting a 0.1 μF capacitor from IOFS to ground. Driving IOFS with a
fixed voltage (typically a DAC calibrated such that the offset at IOPP/IOPN is nulled) can
extend the operating frequency range to include dc. The QOFS pin can likewise be used
to null offsets on the Q-channel mixer output (QMXO).
F
14
VREF
Reference Voltage Output. This output voltage (1 V) is the main bias level for the device
and can be used to externally bias the inputs and outputs of the baseband amplifiers.
The typical maximum drive current for this output is 2 mA.
G


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