Analog Devices AD6122 Manual page 4

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