參數(shù)資料
型號(hào)： AD8347ARUZ
廠商： ANALOG DEVICES INC
元件分類(lèi)： 調(diào)制器/解調(diào)器
英文描述： 800 MHz - 2700 MHz RF/MICROWAVE QUADRAPHASE DEMODULATOR
封裝： MO-153AE, RU-28, TSSOP-28
文件頁(yè)數(shù)： 25/28頁(yè)
文件大?。?/td> 623K
代理商： AD8347ARUZ
AD8347
Rev. A | Page 6 of 28
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
RFIN
VREF
RFIP
VPS2
IMXO
COM3
IOPP
IOFS
IOPN
VCMO
VPS1
LOIN
IAIN
COM2
VDT2
QMXO
QOPP
QOFS
QOPN
VAGC
COM3
VGIN
ENBL
LOIP
COM1
VDT1
QAIN
VPS3
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
AD8347
TOP VIEW
(Not to Scale)
02675-002
Figure 2. 28-Lead TSSOP Pin Configuration
Table 3. Pin Function Descriptions
Equiv.
Circuit
Pin No.
Mnemonic
Description
1, 28
LOIN, LOIP
A
LO Input. For optimum performance, these inputs are differentially driven. Typical input drive level is
equal to 8 dBm. To improve the match to a 50 Ω source, connect a 200 Ω shunt resistor between LOIP
and LOIN. A single-ended drive is possible, but slightly increases LO leakage.
2
VPS1
Positive Supply for LO Section. Decouple VPS1 with 0.1 μF and 100 pF capacitors.
3, 4
IOPN, IOPP
B
I-Channel Differential Baseband Output. Typical output swing is equal to 760 mV p-p differential in
AGC mode. The common-mode level on these pins is programmed by the voltage on VCMO.
5
VCMO
C
Baseband Amplifier Common-Mode Voltage. The voltage applied to this pin sets the output common-
mode level of the baseband amplifiers. This pin can either be connected to VREF (Pin 14) or to a
reference voltage from another device (typically an ADC).
6
IAIN
D
I-Channel Baseband Amplifier Input. This pin, which has a high input impedance, should be biased to
VREF (approximately 1 V). If IAIN is connected directly to IMXO, biasing is provided by IMXO. If an ac-
coupled filter is placed between IMXO and IAIN, this pin can be biased from VREF through a 1 kΩ
resistor. The gain from IAIN to the differential outputs IOPN/IOPP is 30 dB.
7, 23
COM3
Ground for Biasing and Baseband Sections.
8, 22
IMXO, QMXO
B
I-Channel and Q-Channel Baseband Mixer/VGA Outputs. Low impedance outputs with bias levels equal to
VREF. IMXO and QMXO are typically connected to IAIN and QAIN, respectively, either directly or through
filters. These outputs have a maximum current limit of about 1.5 mA. This allows for a 600 mV p-p swing into
a 200 Ω load. This corresponds to an input level of 40 dBm @ a maximum gain of 39.5 dB. At lower output
levels, IMXO and QMXO can drive a lower load resistance, subject to the same current limit.
9
COM2
RF Section Ground.
10, 11
RFIN, RFIP
E
RF Input. RFIN must be ac-coupled to ground. The RF input signal should be ac-coupled into RFIP. For
a broadband 50 Ω input impedance, connect a 200 Ω resistor from the signal side of the RFIP coupling
capacitor to ground. Note that RFIN and RFIP are not interchangeable differential inputs. RFIN is the
ground reference for the input system.
12
VPS2
Positive Supply for RF Section. Decouple VPS2 with 0.1 μF and 100 pF capacitors.
13, 16
IOFS, QOFS
F
I-Channel and Q-Channel Offset Nulling Inputs. To null the dc offset on the I-channel and Q-channel
mixer outputs (IMXO, QMXO), connect a 0.1 μF capacitor from these pins to ground. Alternately, a
forced voltage of approximately 1 V on these pins disables the offset compensation circuit.
14
VREF
G
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 VREF pin should be
decoupled with a 0.1 μF capacitor to ground.
15
ENBL
H
Chip Enable Input. Active high.
17
VGIN
C
Gain Control Input. The voltage on this pin controls the gain on the RF and baseband VGAs. The gain
control is applied in parallel to all VGAs. The gain control voltage range is from 0.2 V to 1.2 V and
corresponds to a gain range from +39.5 dB to 30 dB. This is the gain to the output of the baseband
VGAs (that is, QMXO and IMXO). There is an additional 30 dB of gain in the baseband amplifiers. Note
that the gain control function has a negative sense (that is, increasing control voltage decreases gain).
In AGC mode, connect this pin directly to VAGC.
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