Datasheet

AD9287 Data Sheet
Rev. E | Page 40 of 52
CW
POWER DOWN ENABLE (0V TO 1V = DISABLE POWER)
EXTERNAL VARIABLE GAIN DRIVE
VARIABLE GAIN CIRCUIT
(0V TO 1.0V DC)
R319
10kΩ
1
2
JP301
GND
VG
R320
39kΩ
VG
AVDD_5V
HILO PIN HI GAIN RANGE = 2.25V TO 5.0V LO GAIN RANGE = 0V TO 1.0V
R315
10kΩ
L310
120nH
C322
0.018µF
C317
0.018µF
R316
274Ω
R317
274Ω
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
10kΩ
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
10kΩ
R313
10kΩ
DNP
C303
DNP
L304
0Ω
R303
DNP
L308
0Ω
24 17 20 23 18 22 19 21
R304
DNP
L306
0Ω
L305
0Ω
L302
0Ω
L303
0Ω
L307
0Ω
C308
0.1µF
C307
0.1µF
C306
0.1µF
C305
0.1µF
R310
187Ω
R309
187Ω
R308
187Ω
R307
187Ω
C302
DNP
L301
0Ω
C301
DNP
R305
374Ω
R306
374Ω
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
10kΩ
DNP
R314
10kΩ
DNP
C310
0.1µF
C309
1000pF
RCLAMP PIN HILO PIN = LO = ±50mV HILO PIN = H = ±75mV
MODE PIN POSITIVE GAIN SLOPE = 0V TO 1.0V NEGATIVE GAIN SLOPE = 2.25V TO 5.0V
U301
POPULATE L301 TO L308 WITH
0Ω RESISTORS OR DESIGN
YOUR OWN FILTER.
DNP: DO NOT POPULATE
05966-017
Figure 64. Evaluation Board Schematic, Optional DUT Analog Input Drive and SPI Interface Circuit