Datasheet

AD9229
Rev. B | Page 28 of 40
HILO PIN HI GAIN RANGE = 2.25V TO 5.0V LO GAIN RANGE = 0V TO 1.0V
AD8332
ENBV
ENBL
HILO
VCM1
VIN1
VIP1
COM1
LOP1
25
26
27
28
29
30
31
32
LON1 VPS1 INH1 LMD1 LMD2 INH2 VPS2 LON2
1 2 3 4 5 6 7 8
RCLMP
GAIN
MODE
VCM2
VIN2
VIP2
COM2
LOP2
16
15
14
13
12
11
10
9
COMM
VOH1
VOL1
VPSV
NC
VOL2
VOH2
COMM
24 23 22 21 20 19 18 17
R304
187Ω
R311
10kΩ
DNP
R314
10kΩ
R315
274Ω
C317
10μF
C318
0.1μF
C325
0.1μF
C326
0.1μF
C321
18nF
R312
10Ω
R307
187Ω
R306
187Ω
R309
187Ω
R305
374Ω
R308
374Ω
R318
DNP
R320
DNP
R321
DNP
C305
DNP
C306
DNP
R319
DNP
C303
DNP
C304
DNP
L305
DNP
L306
DNP L307
DNP
L308
DNP
L309
DNP
L310
DNP L311
DNP
L312
DNP
C313
0.1μF
C315
0.1μF
C307
0.1μF
C308
0.1μF
C309
0.1μF
C310
0.1μF
CH_CCH_D CH_D CH_C
C314
0.1μF
AVDD_VGA
AVDD_VGA AVDD_VGA
R316
274Ω
C322
18nF
C323
22pF
C324
22pF
L313
120nH
L314
120nH
C327
0.1μF
C328
0.1μF
INH4 INH3
R311
10kΩ
DNP
R317
10kΩ
DNP
C320
10μF
C319
0.1μF
C316
0.1μF
AVDD_VGA
VG
R310
100kΩ
DNP
C312
0.1μF
C311
1nF
DNP : DO NOT POPULATE
MODE PIN POSITIVE GAIN SLOPE = 0V TO 1.0V NEGATIVE GAIN SLOPE = 2.25V TO 5.0V
RCLAMP PIN HILO PIN = LO = ± 50mV HILO PIN = HI = ± 75mV
EXT VG
JP301
12
VG
GND
AVDD_VGA
R302
10kΩ
R303
39kΩ
CW
VG
EXTERNAL VARIABLE GAIN DRIVE
VARIABLE GAIN CIRCUIT (0V TO 1.0V DC)
OPTIONAL VGA DRIVE CIRCUIT FOR CHANNELS C AND D
POWER-DOWN ENABLE (0V TO 1V = DISABLE POWER)
044181-003
U301
AVDD_VGA
POPULATE L305 TO L312
WITH 0Ω RESISTORS OR
DESIGN YOUR OWN FILTER
Figure 50. Evaluation Board Schematic, Optional DUT Analog Input Drive