7-bit 0.25 dB Digital Step Attenuator

150 MHz to 4000 MHz

Glitch-Free

13

Rev1 March 2012

IDTF1950

DATASHEET

Pin # Pin Name Pin Function

1

DO

Parallel Control – 0.25 dB attenuation step. Pull high for 0.25 dB Attenuation.

2

Main Supply. Use 3.3V or 5V. Current is < 1 mA.

3

Pull low for parallel mode. Pull high or leave unconnected for serial mode.

4

GND

Connect directly to paddle ground or as close as possible to pin with thru via.

5

RF1

Device RF input or output (bi-directional). Must AC couple to this pin.

6

GND

Connect directly to paddle ground or as close as possible to pin with thru via.

7

GND

Connect directly to paddle ground or as close as possible to pin with thru via.

8

GND

Connect directly to paddle ground or as close as possible to pin with thru via.

9

GND

Connect directly to paddle ground or as close as possible to pin with thru via.

10

GND

Connect directly to paddle ground or as close as possible to pin with thru via.

11

GND

Connect directly to paddle ground or as close as possible to pin with thru via.

12

GND

Connect directly to paddle ground or as close as possible to pin with thru via.

13

GND

Connect directly to paddle ground or as close as possible to pin with thru via.

14

RF2

Device RF input or output (bi-directional). Must AC couple to this pin.

15

GND

Connect directly to paddle ground or as close as possible to pin with thru via.

16

LE

Latch Enable. Serial Data latched into active register on rising edge.

17

CLK

Serial Clock Input

18

DATA

Serial Data Input

19

D6

Parallel Control – 16 dB attenuation step. Pull high for 16 dB Attenuation.

20

D5

Parallel Control – 8 dB attenuation step. Pull high for 8 dB Attenuation.

21

D4

Parallel Control – 4 dB attenuation step. Pull high for 4 dB Attenuation.

22

D3

Parallel Control – 2 dB attenuation step. Pull high for 2 dB Attenuation.

23

D2

Parallel Control – 1 dB attenuation step. Pull high for 1 dB Attenuation.

24

D1

Parallel Control – 0.5 dB attenuation step. Pull high for 0.5 dB Attenuation.

EP

Exposed

Paddle

Connect to Ground with multiple vias for good thermal relief.