AD6122
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
3
4
5
31
32
1
PD2
Power-Down 2
Modulator Power-Down Control Input; CMOS Compat-
ible; HIGH = Modulator Off , LOW = Modulator On.
Connects to Emitter of External PNP Pass Transistor
and VCC.
LDOE
LDOB
LDOC
Low Dropout Regulator Pass
Transistor Emitter Connection
Low Dropout Regulator Pass
Transistor Base
Low Dropout Regulator Pass
Transistor Collector
Connects to Base of External PNP Pass Transistor.
2
Connects to Collector of External PNP Pass Transistor.
6
7
3, 4
5
LDOGND
DGND
Low Dropout Regulator Ground
Digital Ground
Ground.
Ground.
8
9
6
7
8
9
LOIPP
LOIPN
DVCC
TXOPP
TXOPN
TXVCC
IFGND
IFINN
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”
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.
10
11
12
13
14
15
16
17
18
19
20
21
10
11
12, 13
14
15
16
17
18
19
20
IFINP
MODOPN
MODOPP
QIPP
QIPN
MODCMREF
Q Input “Negative”
Modulator Common-Mode
Reference Out
Connects to CDMA Baseband Converter Tx DAC
Common-Mode Reference Input.
22
23
24
21
22
23, 24
25
IIPN
IIPP
IFGND
NC
I Input “Negative”
I Input “Positive”
Ground
Connects to I “Negative” Output of Baseband IC.
Connects to I “Positive” Output of Baseband IC.
Connects to IF Ground.
No Connect
25
26
26
27
IFVCC
REFOUT
IF VCC
Gain Control Reference Output
Connects to Decoupled Output of LDO Regulator.
Provides 1.23 V Voltage Reference Output for DAC in
CDMA Baseband Converter and REFIN.
27
28
28
29
REFIN
VGAIN
Gain Control Reference Input
Gain Control Voltage Input
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.
–4–
REV. B