Datasheet

250MHz to 4000MHz Dual,
Analog Voltage Variable Attenuator
MAX19790
8
Pin Description
Pin Configuration/Functional Diagram
GND
GND
GND
GND
CTRL
GND
V
CC
GND
GND
GND
GND
V
CC
GND
IN_B
GND
*EXPOSED PAD.
GND
1 2 3 4 5 6 7 8 9
10
11
12
13
14
15
16
17
18
192021222324252627
28
29
ATTEN_B
ATTEN_A
30
31
32
33
34
35
36
V
CC
GND GND GND GND GND
OUT_A
GND
GND GND GND GND GND GND GND GND GND
THIN QFN
TOP VIEW
GND
IN_A
OUT_B
ATTENUATION-
CONTROL
CIRCUITRY
*EP
+
MAX19790
PIN NAME FUNCTION
1, 3, 4, 6, 7, 9, 10,
12, 14–28, 30, 31,
33, 34, 36
GND Ground. Connect to the board’s ground plane using low-inductance layout techniques.
2 OUT_A
Attenuator A Output. Internally matched to 50I over the operating frequency band. This pin,
if used, requires a DC block. If this attenuator is not used, the pin can be left unconnected.
5, 13, 32 V
CC
Power Supply. Bypass to GND with capacitors and resistors as shown in the Typical
Application Circuit.
8 IN_A
Attenuator A Input. Internally matched to 50I over the operating frequency band. This pin,
if used, requires a DC block. If this attenuator is not used, the pin can be left unconnected.
11 CTRL
Analog Attenuator Control Input. V
CC
must be present unless using a current-limiting resis-
tor, as noted in the Applications Information section. Limit voltages applied to this pin to a
+1.0V to +4.0V range with V
CC
present to ensure device reliability.
29 OUT_B
Attenuator B Output. Internally matched to 50I over the operating frequency band. This pin,
if used, requires a DC block. If this attenuator is not used, the pin can be left unconnected.
35 IN_B
Attenuator B Input. Internally matched to 50I over the operating frequency band. This pin,
if used, requires a DC block. If this attenuator is not used, the pin can be left unconnected.
— EP
Exposed Pad. Internally connected to GND. Solder evenly to the board’s ground plane for
proper operation.