Datasheet
LM97593
V
IN
A-
V
IN
A+
13
14
24
23
22
V
IN
B-
V
IN
B+
15
16
17
0.1 PF
0.1
PF
10 PF
0.1 PF
0.1
PF
10 PF
0.1
PF
REMOVE GND & POWER PLANES
FROM UNDER THESE COMPONENTS
& SIGNALS AS MUCH AS POSSIBLE
V
COM
B
V
RP
B
V
RN
B
V
COM
A
V
RP
A
V
RN
A
V
IN_A
0.01
PF
T3
M/A-COM PART NO.
ETK4-2T
CLC5526
DVGA
1
2
3
4
5
1 nF
1 nF
0.01
PF
0.01
PF
L1
A
C1
A
C2
A
C3
A
500Ö
500Ö
REMOVE GND & POWER PLANES
FROM UNDER THESE COMPONENTS
& SIGNALS AS MUCH AS POSSIBLE
27
26
V
IN_B
T3
M/A-COM PART NO.
ETK4-2T
CLC5526
DVGA
1
2
3
4
5
1 nF
1 nF
0.01
PF
0.01
PF
L1
B
C1
B
C2
B
C3
B
500Ö
500Ö
BANDPASS FILTER
0.1
PF
0.01
PF
BANDPASS FILTER
AGAIN[2:0]
3
BGAIN[2:0]
3
40, 41, 42
127, 126, 125
Note:
Æ PCB parasitics may require component value adjustment.
Æ See LM97593 (%XVHU¶VJXLGHIRUFRPSOHWHGHWDLOV.
A/R
A/R
150 MHz 250 MHz
L1 43 nH 22 nH
C1
43 pF
18 pF
C2
43 pF
18 pF
C3 -
0.5 pF
FILTER COMPONENT VALUES
FREQUENCY
LM97593
SNWS019B –JULY 2007–REVISED APRIL 2013
www.ti.com
Figure 86. Application Circuit
POWER SUPPLY CONSIDERATIONS
The power supply pins should be bypassed with a 10 µF capacitor and with a 0.1 µF ceramic chip capacitor near
each power pin. Leadless chip capacitors are preferred because they have low series inductance.
The LM97593 is sensitive to power supply noise. Accordingly, the noise on the analog supply pins should be
kept below 100 mV
P-P
.
No pin should ever have a voltage on it that is in excess of the supply voltages, not even on a transient basis. Be
especially careful of this during power turn on and turn off.
The V
DR
pin provides power for the output drivers and should be operated from a supply equivalent to V
D
.
LAYOUT AND GROUNDING
A proper grounding and proper routing of all signals are essential to ensure accurate conversion. Maintaining
separate analog and digital areas of the board, with the LM97593 between these areas, is required to achieve
specified performance.
The ground return for the data outputs (DRGND) carries the ground current for the output drivers. The output
current can exhibit high transients that could add noise to the conversion process. To prevent this from
happening, the DRGND pins should NOT be connected to system ground in close proximity to any of the
LM97593's other ground pins.
54 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated
Product Folder Links: LM97593