Datasheet

AD9228 Data Sheet
Rev. E | Page 42 of 56
CW
POWER DOWN ENABLE (0-1V = DISABLE POWER)
EXTERNAL VARIABLE GAIN DRIVE
VARIABLE GAIN CIRCUIT
(0-1.0V DC)
R319
10k
12
JP301
GND
VG
R320
39k
VG
AVDD_5V
HILO PIN HI GAIN RANGE = 2.25V-5.0V LO GAIN RANGE = 0-1.0V
R315
10k
L310
120nH
C322
0.018µF
C317
0.018µF
R316
274
R317
274
C312
0.1µF
C325
0.1µF
C313
0.1µF
C314
0.1µF
L309
120nH
C318
22pF
C321
0.1µF
C320
0.1µF
C316
0.1µF
R318
10k
C323
22pF
C319
0.1µF
C324
0.1µF
INH4 INH3
AVDD_5V AVDD_5V
C326
10µF
C315
10µF
OPTIONAL VGA DRIVE CIRCUIT FOR CHANNEL C AND CHANNEL D
C311
0.1µF
R312
10k
R313
10k
DNP
C303
DNP
L304
0
R303
DNP
L308
0
24 17 20 23 18 22 19 21
R304
DNP
L306
0
L305
0
L302
0
L303
0
L307
0
C308
0.1µF
C307
0.1µF
C306
0.1µF
C305
0.1µF
R310
187
R309
187
R308
187
R307
187
C302
DNP
L301
0
C301
DNP
R305
374
R306
374
CH_C CH_D CH_D CH_C
AVDD_5V
AVDD_5V
AVDD_5V
C304
DNP
R301
DNP
R302
DNP
31
10
26
25
14
27
3 6 4 5 1 8
32
9
15
16
VG
28
13
29
12
30
11
2 7
COM1
COM2
ENBL
ENBV
GAIN
HILO
INH1 INH2 LMD1 LMD2 LON1 LON2
LOP1
LOP2
MODE
NC
RCLMP
VCM1
VCM2
VIN1
VIN2
VIP1
VIP2
VOH1 VOH2
VOL1 VOL2
VPS1 VPS2
VPSV
AD8332
COMM COMM
R311
10k
DNP
R314
10k
DNP
C310
0.1µF
C309
1000pF
RCLAMP PIN HILO PIN = LO = ±50mV HILO PIN = H = ±75mV
05727-017
MODE PIN POSITIVE GAIN SLOPE = 0-1.0V NEGATIVE GAIN SLOPE = 2.25V-5.0V
U301
POPULATE L301-L308 WITH 0

RESISTORS OR DESIGN YOUR
OWN FILTER.
DNP: DO NOT POPULATE
Figure 75. Evaluation Board Schematic, Optional DUT Analog Input Drive and SPI Interface Circuit