LT5538IDD-PBF LINER [Linear Technology], LT5538IDD-PBF Datasheet - Page 10

• Manufacturer Part Number: LT5538IDD-PBF
• Description: 40MHz to 3.8GHz RF Power Detector with 75dB Dynamic Range
• Manufacturer: LINER [Linear Technology]

APPLICATIONS INFORMATION
LT5538
ENBL (ENABLE) PIN OPERATION
A simplifi ed circuit schematic of the ENBL Pin is shown
in Figure 5. The enable voltage necessary to turn on the
LT5538 is 1V. The current drawn by the ENBL pin varies
with the voltage applied at the pin. When the ENBL volt-
age is 3V, the ENBL current is typically 100 μA. When the
ENBL voltage is 5V, the ENBL current is increased to 200
TEST CIRCUIT
40MHz to 2.7GHz
10
REF DES
C1
C2, C10
C4, C5
C8
R1
R4
L1
VALUE
0.1μF
100pF
1nF
1pF
56
4.99k
1.5nH
INPUT
RF
SIZE
0603
0402
0603
0402
0402
0402
0402
1pF
C8
PART NUMBER
AVX 0603ZC104KAT
AVX 0402YC101KAT
AVX 0402ZC102K
AVX 0402YA1ROCAT
VISHAY, CRCW040256ROFKED
VISHAY, CRCW04024K99FKED
TOKO, LL1005-FH2IN5S
ENABLE
1.5nH
L1
Figure 5. Simplifi ed Schematic of the Enable Circuit
56Ω
R1
4.99k
Figure 6. Evaluation Board Circuit Schematic
R4
1nF
C4
1nF
C5
V
ENBL
CC
1
2
3
4
ENBL
IN
IN
GND
42k
+
–
μA. To disable or turn off the chip, this voltage should be
below 0.3V. It is important that the voltage applied to the
ENBL pin should never exceed V
Otherwise, the supply current may be sourced through the
upper ESD protection diode connected at the ENBL pin.
Under no circumstances should voltage be applied to the
ENBL Pin before the supply voltage is applied to the V
pin. If this occurs, damage to the IC may result.
3.6GHz to 3.8GHz
NOTE: Replace L
LT5538
9
REF DES
C4, C11
C8
C5
5538 F05
CAP
CAP
5538 TC01
OUT
42k
V
CC
+
–
8
7
6
5
C2
100pF
VALUE
12pF
0.7pF
OPEN
1
with C
C1
0.1μF
C9
OPT
11.
SIZE
0402
0402
R5
O
C6
OPT
C10
100pF
5V
PART NUMBER
MURATA, GRM155C1H120JZ01B
MURATA, GJR155C1HR70BB01
C7
OPT
V
CC
OUT
by more than 0.3V.
5538f
CC