Digital Step Attenuator
31.5 dB, 0.5 dB Step
6 Bit, Serial Control Interface, Dual Supply Voltage
Product Features
• Dual Supply Voltage: V
DD
=+3V, V
SS
=-3V
• Immune to latch up
• Excellent accuracy, 0.1 dB Typ
• Serial control interface
• Fast switching control frequency, 1 MHz typ.
• Low Insertion Loss
• High IP3, +52 dBm Typ
• Very low DC power consumption
• Excellent return loss, 20 dB Typ
• Small size 4.0 x 4.0 mm
Typical Applications
• Base Station Infrastructure
• Portable Wireless
• CATV & DBS
• MMDS & Wireless LAN
• Wireless Local Loop
• UNII & Hiper LAN
• Power amplifier distortion canceling loops
50Ω DC-2400 MHz
DAT-31R5-SN+
DAT-31R5-SN
+ RoHS compliant in accordance
with EU Directive (2002/95/EC)
The +Suffix identifies RoHS Compliance. See our web site for
RoHS Compliance methodologies and qualifications.
General Description
The DAT-31R5-SN is a 50Ω RF digital step attenuator that offers an attenuation range up to 31.5 dB in
0.5 dB steps. The control is a 6-bit serial interface, operating on dual supply voltage: V
DD
=+3V, V
SS
=-3V.
The DAT-31R5-SN is produced using a unique CMOS process on silicon, offering the performance of
GaAs, with the advantages of conventional CMOS devices.
Simplified Schematic
RF Input
16dB
8dB
4dB
2dB
1dB
0.5dB
RF Out
Digital Serial Control
REV. C
M112685
DAT-31R5-SN
070819
Page 1 of 12
Digital Step Attenuator
RF Electrical Specifications, DC-2400 MHz, T
AMB
=25°C, V
DD
=+3V, V
SS
=-3V
Parameter
Accuracy @
0.5 dB
Attenuation Setting
1-2.4
DC-1
Accuracy @
1 dB
Attenuation Setting
1-2.4
Accuracy @
2 dB
Attenuation Setting
DC-1
1-2.4
DC-1
1-2.4
DC-1
1-2.4
DC-1
Accuracy @
16 dB
Attenuation Setting
1-2.4
DC-1
1-2.4
DC-2.4
DC-2.4
DC-1
1-2.4
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0.05
0.05
0.15
0.07
0.15
0.03
0.15
0.1
0.15
1.3
1.6
+52
+24
1.2
1.2
—
—
0.05
0.02
Freq. Range
(GHz)
DC-1
Min.
—
Typ.
0.03
DAT-31R5-SN+
DAT-31R5-SN
Max.
0.1
0.15
0.1
0.15
0.15
0.25
0.2
0.25
0.2
0.25
0.3
0.3
1.9
2.4
—
—
1.5
1.5
Units
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dBm
dBm
—
—
Accuracy @
4 dB
Attenuation Setting
Accuracy @
8 dB
Attenuation Setting
Insertion Loss
(note1)
@ all attenuator set to 0dB
Input IP3
(note 2)
(at Min. and Max. Attenuation)
Input Power @ 0.2dB Compression*
(at Min. and Max. Attenuation)
VSWR
Notes:
1. I. Loss values are de-embedded from test board Loss (test board’s Insertion Loss: 0.10dB @100MHz, 0.35dB @1000MHz,
0.60dB @2400MHz, 0.75dB @4000MHz)
2. Input IP3 and 1dB compression degrades below 1 MHz
DC Electrical Specifications
Parameter
V
DD
, Supply Voltage
V
SS
, Supply Voltage
I
DD
(I
SS
), Supply Current
Control Input Low
Control Input High
Control Current
Min.
2.7
-3.3
—
—
0.7xV
DD
—
Typ.
3
-3
—
—
—
—
Max.
3.3
-2.7
100
0.3xV
DD
—
1
Units
V
V
μA
V
V
μA
Switching Specifications
Parameter
Switching Speed, 50% Control to 0.5dB
of Attenuation Value
Switching Control Frequency
Min.
—
—
Typ.
1.0
1.0
Max.
—
—
Units
μSec
MHz
Absolute Maximum Ratings
Parameter
Operating Temperature
Storage Temperature
V
DD
V
SS
Voltage on any input
ESD, HBM
ESD, MM
Input Power
Ratings
-40°C to 85°C
-55°C to 100°C
-0.3V Min., 4V Max.
-4V Min., 0.3V Max.
-0.3V Min., V
DD
+0.3V Max.
500V
100V
+24dBm
Page 2 of 12
Digital Step Attenuator
Pin Description
Function
C16
RF in
Data
Clock
LE
V
DD
N/C
N/C
V
DD
GND
GND
V
SS
V
DD
RF out
C8
C4
C2
GND
C1
C0.5
GND
Pin
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Paddle
Description
DAT-31R5-SN+
DAT-31R5-SN
Pin Configuration (Top View)
C1
C2
17
RF in port (Note 1)
Serial Interface data input (Note 3)
Serial Interface clock input
Latch Enable Input (Note 2)
Positive Supply Voltage
Not connected
Not connected
Positive Supply Voltage
Ground connection
Ground connection
Negative Supply Voltage
Positive Supply Voltage
RF out port (Note 1)
Control for attenuation bit, 8 dB (Note 4)
Control for attenuation bit, 4 dB (Note 4)
Control for attenuation bit, 2 dB (Note 4)
Ground Connection
Control for attenuation bit, 1 dB (Note 4)
Control for attenuation bit, 0.5 dB (Note 4)
Paddle ground (Note 5)
C16
RFin
Data
Clock
LE
1
20
19
18
16
15
C4
Control for Attenuation bit, 16dB (Notes 3,4)
GND
C0.5
C8
RFout
VDD
VSS
GND
2
3
4
2x2mm
Paddle
ground
10
6
7
14
13
12
11
5
8
9
Notes:
1. Both RF ports must be held at 0VDC or DC blocked with an external series capacitor.
2. Latch Enable (LE) has an internal 100KΩ resistor to V
DD
.
3. Place a 10KΩ resistor in series, as close to pin as possible to avoid freq. resonance.
4. Refer to Power-up Control Settings.
5. The exposed solder pad on the bottom of the package (See Pin configuration) must
be grounded for proper device operation.
GND
VDD
VDD
N/C
N/C
Page 3 of 12
Digital Step Attenuator
Typical Performance Curves
8
7
6
5
(dB)
DAT-31R5-SN+
DAT-31R5-SN
1
0.9
0.8
0.7
0.6
(dB)
INSERTION LOSS (Ref) @ +25°C, +85°C, -45°C
+85°C
+25°C
-45°C
ATTENUATION (0.5dB) @ +25°C, +85°C, -45°C
4
3
2
0.5
0.4
0.3
0.2
-45°C
+25°C
+85°C
1
0
0
500
1000
1500
2000
2500
3000
3500
4000
Frequency (MHz)
0.1
0
0
500
1000
1500
2000
2500
3000
3500
4000
Frequency (MHz)
1.5
1.4
1.3
1.2
1.1
ATTENUATION (1dB) @ +25°C, +85°C, -45°C
2.5
2.4
2.3
2.2
2.1
(dB)
ATTENUATION (2dB) @ +25°C, +85°C, -45°C
(dB)
1
2
1.9
0.9
0.8
0.7
0.6
0.5
0
500
1000
1500
2000
2500
3000
3500
4000
Frequency (MHz)
-45°C
+25°C
+85°C
1.8
1.7
1.6
1.5
0
500
1000
1500
2000
2500
3000
-45°C
+25°C
+85°C
3500
4000
Frequency (MHz)
4.5
4.4
4.3
4.2
4.1
ATTENUATION (4dB) @ +25°C, +85°C, -45°C
9
8.8
8.6
8.4
8.2
(dB)
ATTENUATION (8dB) @ +25°C, +85°C, -45°C
(dB)
4
3.9
3.8
3.7
3.6
3.5
0
500
1000
1500
2000
2500
3000
3500
4000
Frequency (MHz)
-45°C
+25°C
+85°C
8
7.8
7.6
7.4
7.2
7
0
500
1000
1500
2000
2500
3000
3500
4000
Frequency (MHz)
-45°C
+25°C
+85°C
Page 4 of 12
Digital Step Attenuator
Typical Performance Curves
17
16.8
16.6
16.4
16.2
31
-45°C
+25°C
+85°C
DAT-31R5-SN+
DAT-31R5-SN
32
ATTENUATION (16dB) @ +25°C, +85°C, -45°C
ATTENUATION (31.5dB) @ +25°C, +85°C, -45°C
30
-45°C
+25°C
+85°C
(dB)
(dB)
16
15.8
15.6
15.4
15.2
15
0
500
1000
1500
2000
2500
3000
3500
4000
Frequency (MHz)
29
28
27
26
0
500
1000
1500
2000
2500
3000
3500
4000
Frequency (MHz)
50
RETURN LOSS IN S11 (REF) @ +25°C, +85°C, -45°C
50
RETURN LOSS OUT S22 (REF) @ +25°C, +85°C, -45°C
-45°C
+25°C
+85°C
40
-45°C
+25°C
+85°C
(dB)
40
30
(dB)
30
20
20
10
10
0
0
500
1000
1500
2000
2500
3000
3500
4000
Frequency (MHz)
0
0
500
1000
1500
2000
2500
3000
3500
4000
Frequency (MHz)
RETURN LOSS IN S11(Major Attenuation Steps) @ +25°C
60
50
40
(dB)
60
50
40
30
20
10
0
RETURN LOSS OUT S22 (Major Attenuation Steps) @+25°C
ATT=0dB
ATT=0.5dB
ATT=1dB
ATT=2dB
ATT=4dB
ATT=8dB
ATT=16dB
ATT=31.5dB
20
10
0
0
500
1000
1500
2000
2500
3000
3500
4000
Frequency (MHz)
(dB)
30
ATT=0dB
ATT=0.5dB
ATT=1dB
ATT=2dB
ATT=4dB
ATT=8dB
ATT=16dB
ATT=31.5dB
0
500
1000
1500
2000
2500
3000
3500
4000
Frequency (MHz)
Page 5 of 12
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