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AD6122 Folha de dados(PDF) 4 Page - Analog Devices

Nome de Peças AD6122
Descrição Electrónicos  CDMA 3 V Transmitter IF Subsystem with Integrated Voltage Regulator
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

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REV. B
AD6122
–4–
PIN FUNCTION DESCRIPTIONS
SSOP
LPCC
Pin #
Pin #
Pin Label
Description
Function
1
30
PD1
Power-Down 1
IF Amplifier Power-Down Control Input; CMOS Com-
patible; HIGH = Entire IC Powers Down, LOW = IF
Amplifiers On.
2
31
PD2
Power-Down 2
Modulator Power-Down Control Input; CMOS Compat-
ible; HIGH = Modulator Off , LOW = Modulator On.
3
32
LDOE
Low Dropout Regulator Pass
Connects to Emitter of External PNP Pass Transistor
Transistor Emitter Connection
and VCC.
4
1
LDOB
Low Dropout Regulator Pass
Connects to Base of External PNP Pass Transistor.
Transistor Base
5
2
LDOC
Low Dropout Regulator Pass
Connects to Collector of External PNP Pass Transistor.
Transistor Collector
6
3, 4
LDOGND
Low Dropout Regulator Ground
Ground.
7
5
DGND
Digital Ground
Ground.
8
6
LOIPP
Local Oscillator “Positive” Input
Connects to Local Oscillator; AC Coupled.
9
7
LOIPN
Local Oscillator “Negative” Input
Connects to Ground via Decoupling Capacitor.
10
8
DVCC
Digital VCC
Connects to Digital Supply.
11
9
TXOPP
Transmit Output “Positive”
Connects to Output Filter; AC Coupled.
12
10
TXOPN
Transmit Output “Negative”
Connects to Output Filter; AC Coupled.
13
11
TXVCC
Transmit Output VCC
Connects to LDO Output via Decoupling Network.
14
12, 13
IFGND
IF Ground
Ground.
15
14
IFINN
IF Input “Negative”
IF “Negative” Input from LC Roofing Filter.
16
15
IFINP
IF Input “Positive”
IF “Positive” Input from LC Roofing Filter.
17
16
MODOPN
Modulator “Negative” If Output
Output Modulator Output to LC Roofing Filter.
18
17
MODOPP
Modulator “Positive” Output
Modulator Output to LC Roofing Filter.
19
18
QIPP
Q Input “Positive”
Connects to Q “Positive” Output of Baseband IC.
20
19
QIPN
Q Input “Negative”
Connects to Q “Negative” Output of Baseband IC.
21
20
MODCMREF
Modulator Common-Mode
Connects to CDMA Baseband Converter Tx DAC
Reference Out
Common-Mode Reference Input.
22
21
IIPN
I Input “Negative”
Connects to I “Negative” Output of Baseband IC.
23
22
IIPP
I Input “Positive”
Connects to I “Positive” Output of Baseband IC.
24
23, 24
IFGND
Ground
Connects to IF Ground.
25
NC
No Connect
25
26
IFVCC
IF VCC
Connects to Decoupled Output of LDO Regulator.
26
27
REFOUT
Gain Control Reference Output
Provides 1.23 V Voltage Reference Output for DAC in
CDMA Baseband Converter and REFIN.
27
28
REFIN
Gain Control Reference Input
Accepts 1.23 V Reference Input from REFOUT or
External Reference.
28
29
VGAIN
Gain Control Voltage Input
Accepts Gain Control Input Voltage from External DAC.
Max Gain = 2.5 V; Min Gain = 0.5 V.


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