AD9874
PIN CONFIGURATION
42 41 40
48 47 46 45 44 43
39 38 37
MXOP
MXON
GNDF
IF2N
1
2
3
4
5
6
7
8
9
GNDL
FREF
GNDS
SYNCB
GNDH
FS
36
35
34
33
32
31
30
29
28
27
26
25
PIN 1
IDENTIFIER
IF2P
AD9874
VDDF
GCP
TOP VIEW
DOUTB
DOUTA
CLKOUT
VDDH
VDDD
PE
(Not to Scale)
GCN
VDDA
GNDA 10
11
VREFP
VREFN 12
13 14 15 16 17 18 19 20 21 22 23 24
PIN FUNCTION DESCRIPTIONS
Pin Mnemonic Description
Pin Mnemonic Description
1
2
3
4
5
6
7
8
MXOP
MXON
GNDF
IF2N
IF2P
VDDF
GCP
Mixer Output, Positive.
Mixer Output, Negative.
27
28
29
30
VDDH
Positive Power Supply for Digital Interface.
Clock Output for SSI Port.
Data Output for SSI Port.
Data Output for SSI Port (Inverted) or
SPI Port.
Frame Sync for SSI Port.
Ground for Digital Interface.
Resets SSI and Decimator Counters;
Active Low.
Substrate Ground.
Reference Frequency Input for Both
Synthesizers.
Ground for LO Synthesizer.
Ground for LO Synthesizer Charge Pump.
LO Synthesizer Charge Pump Output
Current Charge Pump.
Positive Power Supply for LO Synthesizer
Charge Pump.
CLKOUT
DOUTA
DOUTB
Ground for Front End of ADC.
Second IF Input (to ADC), Negative.
Second IF Input (to ADC), Positive.
Positive Power Supply for Front End of ADC.
Filter Capacitor for ADC Full-Scale Control.
Full-Scale Control Ground.
Positive Power Supply for ADC Back End.
Ground for ADC Back End.
Voltage Reference, Positive.
Voltage Reference, Negative.
Reference Resistor: Requires 100 kΩ to
GNDA.
Positive Power Supply for Clock Synthesizer.
Clock Synthesizer Charge Pump Output
Current.
31
32
33
FS
GNDH
SYNCB
GCN
9
VDDA
GNDA
VREFP
VREFN
RREF
34
35
GNDS
FREF
10
11
12
13
36
37
38
GNDL
GNDP
IOUTL
14
15
VDDQ
IOUTC
39
VDDP
40
41
VDDL
CXVM
Positive Power Supply for LO Synthesizer.
External Filter Capacitor; DC Output of
LNA.
LO Input to Mixer and LO Synthesizer,
Negative.
LO Input to Mixer and LO Synthesizer,
Positive.
External Bypass Capacitor for LNA Power
Supply.
Ground for Mixer and LNA.
External Capacitor for Mixer V-I Con-
verter Bias.
First IF Input (to LNA).
16
GNDQ
Ground for Clock Synthesizer Charge
Pump.
Positive Power Supply for Clock Synthesizer.
Ground for Clock Synthesizer.
Sampling Clock Input/Clock VCO Tank,
Positive.
Sampling Clock Input/Clock VCO Tank,
Negative.
17
18
19
VDDC
GNDC
CLKP
42
43
44
LON
LOP
20
CLKN
CXVL
21
22
23
24
25
26
GNDS
GNDD
PC
PD
PE
Substrate Ground.
45
46
GNDI
CXIF
Ground for Digital Functions.
Clock Input for SPI Port.
Data I/O for SPI Port.
Enable Input for SPI Port.
Positive Power Supply for Internal Digital
Function.
47
48
IFIN
VDDI
Positive Power Supply for LNA and Mixer.
VDDD
–6–
REV. A