UMS CHT4012-98F

CHT4012-98F
RoHS COMPLIANT
DC-6GHz 6-BIT DIGITAL ATTENUATOR
GaAs Monolithic Microwave IC
Description
The CHT4012-98F is a DC-6GHz monolithic
6 bit digital attenuator with a LSB = 0.5dB
offering a high dynamic range and a high
accuracy, the RMS amplitude error is
typically as low as 0.3dB. The circuit provides
low insertion loss 2.5dB associated to input
and output return losses better than 14dB. A
CMOS and TTL compatible interface is
available on chip.
The circuit is mainly dedicated to defence
and space systems and is also well suited for
a wide range of microwave applications and
systems.
The circuit is manufactured with a pHEMT
process, 0.25µm gate length and electron
beam gate lithography.
It is available in chip form
Main Features
Frequency :
0.1GHz-6GHz
■ Broadband performances: DC-6GHz
■ Insertion Loss (state 0): 2.5dB
■ RMS attenuation error: 0.3dB
■ RMS phase variation: 1deg
■ DC bias: V+=5V and V-=-5V
■ No decoupling capacitance on Input and
Output RF accesses
■ Chip size 2.41x1.41x0.1mm
Main Characteristics
Tamb.= +25°C
Symbol
Freq
IL
Rms_att_er
Rms_phivar
Parameter
Frequency range
Insertion Loss
RMS of attenuation error
RMS of phase variation (0.1 to 6GHz)
Ref. : DSCHT40121069 - 10 Mar 11
1/14
Min
DC
Typ
2.5
0.3
1
Max
6
Unit
GHz
dB
dB
°
Specifications subject to change without notice
United Monolithic Semiconductors S.A.S.
Route Départementale 128 - BP46 - 91401 Orsay Cedex France
Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
CHT4012-98F
DC-6GHz 6-BIT DIGITAL ATTENUATOR
Main Characteristics
Tamb.= +25°C
Symbol
Freq
Parameter
Min
Operating frequency
IL
Typ
DC
Max
Unit
6
GHz
Insertion Loss
2.5
dB
S11
Input Return Loss
-16
dB
S22
Output Return Loss
-14
dB
Input power at 1dB gain compression
20
dBm
P1dB
Dyn
Dynamic
31.5
dB
LSB
Attenuator elementary step
0.5
dB
-0.5/+0.5
dB
0.3
dB
-5 / +1
°
1
°
V
Att_er
Rms_att_er
Phivar
Rms_phivar
Attenuation error
RMS of attenuation error
Phase variation (0.1 to 6GHz)
RMS of phase variation (0.1 to 6GHz)
V+
Positive supply voltage
5
V-
Negative supply voltage
-5
-4
V
Vctrl_L
Control voltage low level
0
0.4
V
Vctrl_H
Control voltage high level
7
V
I_V+
Positive supply DC current
5
mA
I_V-
Negative supply DC current
5
mA
2.4
These values are representative of measurements in test fixture
Ref. : DSCHT40121069 - 10 Mar 11
2/14
Route Départementale 128, BP46 - 91401 ORSAY Cedex - FRANCE
Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
Specifications subject to change without notice
DC-6GHz 6-BIT DIGITAL ATTENUATOR
CHT4012-98F
Definitions
n: Attenuator state index with 0 ≤ n ≤ 63
Phase_S21(n):
Measured phase of S21 in degree at attenuation state n
dB_S21(n):
Measured magnitude of S21 in dB at attenuation stateni
Attenuation Error (Att_err)
Att_err(n)= dB_S21 (n) - dB_S21(0) –0.5xn (dB)
The translation of Att_err(i) from dB to linear is given by: Att_err_lin(n) = 10
Att _ err ( n )
20
Phase variation (Phivar)
Phivar(n) = Phase_S21(n) - Phase_S21(0) (°)
RMS Attenuation Error (Rms_att)
Rms_att = 20 log 1
1 63
. (1 Att _ err _ lin(n))2
64 n 0
(dB)
RMS Phase variation (Rms_Phivar)
63
( Phi var( n))2
Rms_Phivar =
n 0
64
(°)
Absolute Maximum Ratings (1)
Tamb.= +25°C
Symbol
Values
Unit
V+
Maximum positive bias voltage
8
V
V-
Minimum negative bias voltage
-8
V
Ai
CTRL voltage (Vctrl _low, Vctrl _high)
-2, 8
V
Pin
Maximum Input power
23
dBm
Tj
Junction temperature
175
°C
Ta
Operating temperature range
-40 to +85
°C
Storage temperature range
-55 to +150
°C
Tstg
(1)
Parameter
Operation of this device above anyone of these parameters may cause permanent damage.
Ref. : DSCHT40121069 - 10 Mar 11
3/14
Route Départementale 128, BP46 - 91401 ORSAY Cedex - FRANCE
Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
Specifications subject to change without notice
CHT4012-98F
DC-6GHz 6-BIT DIGITAL ATTENUATOR
Typical on-wafer Sij parameters at State 0
Tamb.= +25°C, V+ = +5V, V-=-5V
Freq
S11
PhS11
S12
(GHz)
(dB)
(°)
(dB)
0.2
-20.21
0.1
-1.69
0.4
-20.33
-9.2
-1.75
0.6
-20.90
-20.2
-1.81
0.8
-20.77
-32.0
-1.87
1.0
-20.75
-40.7
-1.90
1.2
-20.45
-48.7
-1.93
1.4
-20.59
-54.5
-1.97
1.6
-20.92
-61.5
-2.03
1.8
-21.15
-69.9
-2.07
2.0
-21.24
-77.4
-2.11
2.2
-21.34
-84.7
-2.15
2.4
-21.48
-90.7
-2.21
2.6
-21.80
-94.9
-2.25
2.8
-22.62
-100.6
-2.30
3.0
-23.17
-106.8
-2.35
3.2
-23.97
-113.1
-2.40
3.4
-24.56
-120.1
-2.44
3.6
-25.40
-123.3
-2.49
3.8
-26.78
-125.4
-2.54
4.0
-28.80
-125.6
-2.59
4.2
-31.95
-128.2
-2.62
4.4
-35.79
-128.9
-2.69
4.6
-42.02
-100.1
-2.74
4.8
-42.57
-39.9
-2.79
5.0
-34.86
-19.8
-2.84
5.2
-30.17
-9.9
-2.89
5.4
-27.13
-7.3
-2.96
5.6
-24.54
-5.9
-3.03
5.8
-22.91
-7.6
-3.07
6.0
-21.40
-11.8
-3.14
6.2
-20.12
-17.1
-3.21
6.4
-18.82
-22.2
-3.28
6.6
-17.69
-24.7
-3.35
6.8
-16.78
-28.2
-3.41
7.0
-16.01
-30.9
-3.49
7.2
-15.35
-34.9
-3.56
7.4
-14.54
-38.7
-3.65
7.6
-13.93
-42.1
-3.71
7.8
-13.18
-46.1
-3.77
8.0
-12.71
-48.8
-3.87
Ref. : DSCHT40121069 - 10 Mar 11
PhS12
(°)
-5.6
-9.9
-14.2
-18.3
-22.5
-26.7
-30.9
-35.2
-39.4
-43.7
-47.8
-52.0
-56.1
-60.3
-64.5
-68.7
-72.8
-76.9
-81.0
-85.1
-89.3
-93.4
-97.6
-101.7
-105.9
-109.9
-114.1
-118.3
-122.5
-126.6
-130.6
-134.8
-138.9
-143.1
-147.2
-151.4
-155.5
-159.5
-163.6
-167.8
4/14
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Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
S21
(dB)
-1.69
-1.75
-1.82
-1.88
-1.90
-1.94
-1.98
-2.04
-2.07
-2.11
-2.15
-2.21
-2.25
-2.30
-2.35
-2.40
-2.44
-2.49
-2.54
-2.60
-2.63
-2.69
-2.72
-2.79
-2.84
-2.90
-2.95
-3.02
-3.08
-3.14
-3.21
-3.27
-3.35
-3.41
-3.49
-3.56
-3.63
-3.71
-3.77
-3.87
PhS21
(°)
-5.6
-9.9
-14.1
-18.3
-22.6
-26.8
-31.0
-35.3
-39.6
-43.8
-47.8
-52.1
-56.3
-60.4
-64.6
-68.7
-72.9
-76.9
-81.1
-85.2
-89.3
-93.5
-97.6
-101.8
-105.9
-110.1
-114.1
-118.4
-122.6
-126.6
-130.8
-134.9
-139.1
-143.1
-147.3
-151.4
-155.6
-159.6
-163.8
-168.0
S22
(dB)
-20.37
-20.27
-20.25
-19.96
-19.67
-19.33
-19.26
-19.21
-19.08
-18.96
-18.86
-18.60
-18.46
-18.30
-18.26
-18.19
-17.92
-17.75
-17.59
-17.52
-17.34
-17.22
-17.00
-16.68
-16.44
-16.17
-16.03
-15.72
-15.40
-15.05
-14.69
-14.38
-14.00
-13.77
-13.35
-13.05
-12.73
-12.36
-12.13
-11.82
PhS22
(°)
-0.3
-8.8
-18.0
-27.4
-35.5
-41.9
-48.4
-55.4
-60.8
-65.8
-70.0
-74.1
-78.1
-81.8
-84.9
-88.0
-90.8
-93.7
-95.7
-97.8
-99.0
-100.4
-101.1
-102.1
-103.6
-104.5
-105.6
-107.0
-108.7
-109.6
-111.4
-112.5
-114.3
-116.3
-117.8
-120.4
-122.3
-124.7
-127.3
-129.9
Specifications subject to change without notice
DC-6GHz 6-BIT DIGITAL ATTENUATOR
CHT4012-98F
Typical Measurements in test fixture:
[S] parameters
T= +25°C, V+ = +5V, V- = -5V
S21 versus Frequency
Attenuator state 0
S11 versus Frequency
All attenuator states
Ref. : DSCHT40121069 - 10 Mar 11
S22 versus Frequency
All attenuator states
5/14
Route Départementale 128, BP46 - 91401 ORSAY Cedex - FRANCE
Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
Specifications subject to change without notice
CHT4012-98F
DC-6GHz 6-BIT DIGITAL ATTENUATOR
Typical Measurements in test fixture:
Attenuator performances: Attenuation error
T= +25°C, V+ = +5V, V- = -5V
Attenuation error versus frequency
All attenuator states
Attenuation error versus Attenuator state
0.1GHz < Freq. < 6GHz
RMS Attenuation error
Attenuation versus Attenuator state
0.1GHz < Freq. < 6GHz
Ref. : DSCHT40121069 - 10 Mar 11
6/14
Route Départementale 128, BP46 - 91401 ORSAY Cedex - FRANCE
Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
Specifications subject to change without notice
DC-6GHz 6-BIT DIGITAL ATTENUATOR
CHT4012-98F
Typical Measurements in test fixture:
Attenuator performances: Phase variation
T= +25°C, V+ = +5V, V- = -5V
RMS of Phase variation
Phase variation versus Frequency
All attenuator states
Ref. : DSCHT40121069 - 10 Mar 11
Phase variation versus Attenuator state
0.1GHz < Freq. < 6GHz
7/14
Route Départementale 128, BP46 - 91401 ORSAY Cedex - FRANCE
Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
Specifications subject to change without notice
CHT4012-98F
DC-6GHz 6-BIT DIGITAL ATTENUATOR
Typical Measurements in test fixture:
Attenuator performances: Phase variation
T= +25°C, V+ = +5V, V- = -5V
Variation of the Gain versus Frequency
Attenuator states: 0 / 1/ 2 / 4 / 8 / 16 / 32 / 63
Input power: -5 to 22dBm
Ref. : DSCHT40121069 - 10 Mar 11
Variation of the gain versus Input power
Attenuator states: 0 / 1/ 2 / 4 / 8 / 16 / 32 / 63
Frequency: 0.25GHz to 6GHz
8/14
Route Départementale 128, BP46 - 91401 ORSAY Cedex - FRANCE
Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
Specifications subject to change without notice
DC-6GHz 6-BIT DIGITAL ATTENUATOR
CHT4012-98F
Mechanical dimensions and pad allocation
Chip thickness = 100µm +/- 10µm.
RF pads (1, 14) = 122 x 100µm²
DC and control pads (2, 4, 6, 7, 8, 9, 10, 13, 12, 15, 16) = 100 x 100µm²
Pin number
1
2
4
6
7
8
9
10
13
14
3, 5
11
12, 15, 16
Pad name
IN
A1
A2
A3
A4
A5
A6
VV+
OUT
V+
GND
Description
Input RF:
Attenuator bit 1
Attenuator bit 2
Attenuator bit 3
Attenuator bit 4
Attenuator bit 5
Attenuator bit 6
-5V supply voltage: interface
+5V supply voltage: interface (1)
Output RF
NC
NC (1)
NC
(1)
Pin n°11 is internally connected to Pin n°13. Each one of these pins can be indifferently
used to supply the control interface with +5V
Ref. : DSCHT40121069 - 10 Mar 11
9/14
Route Départementale 128, BP46 - 91401 ORSAY Cedex - FRANCE
Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
Specifications subject to change without notice
CHT4012-98F
DC-6GHz 6-BIT DIGITAL ATTENUATOR
Bonding recommendations
Port
Connection
IN (1)
OUT (14)
Inductance (Lbonding) = 0.3nH
one wire: diameter 25µm, length 0.4mm
DC and Interface pads
Inductance (Lbonding) = 0.8nH
one wire: diameter 25µm, length 1.0mm
Recommended assembly diagram
Note:
An external capacitance is requested to protect the device from any external DC voltage that
might be present on the RF accesses.
Ref. : DSCHT40121069 - 10 Mar 11
10/14
Route Départementale 128, BP46 - 91401 ORSAY Cedex - FRANCE
Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
Specifications subject to change without notice
DC-6GHz 6-BIT DIGITAL ATTENUATOR
CHT4012-98F
Bonding recommendations
Pin number
2
4
6
7
8
9
10
13
Pad name
A1
A2
A3
A4
A5
A6
VV+
Value
0V / 3.3V or 0V / 5V
0V / 3.3V or 0V / 5V
0V / 3.3V or 0V / 5V
0V / 3.3V or 0V / 5V
0V / 3.3V or 0V / 5V
0V / 3.3V or 0V / 5V
-5V
+5V
NOTE:
Control voltages of the attenuator bits are both CMOS and TTL compatible
Ref. : DSCHT40121069 - 10 Mar 11
11/14
Route Départementale 128, BP46 - 91401 ORSAY Cedex - FRANCE
Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
Specifications subject to change without notice
CHT4012-98F
DC-6GHz 6-BIT DIGITAL ATTENUATOR
Attenuator control table
Voltage to apply on the pads A1 to A6:
state
A6
A5
A4
A3
A2
A1
state
0
Att
(dB)
0
A6
A5
A4
A3
A2
A1
33
Att
(dB)
16.5
0
0
0
0
0
0
3.3
0
0
0
0
3.3
1
0.5
0
0
0
0
0
3.3
34
17
3.3
0
0
0
3.3
0
2
1
0
0
0
0
3.3
0
35
17.5
3.3
0
0
0
3.3
3.3
3
1.5
0
0
0
0
3.3
3.3
36
18
3.3
0
0
3.3
0
0
4
2
0
0
0
3.3
0
0
37
18.5
3.3
0
0
3.3
0
3.3
5
2.5
0
0
0
3.3
0
3.3
38
19
3.3
0
0
3.3
3.3
0
6
3
0
0
0
3.3
3.3
0
39
19.5
3.3
0
0
3.3
3.3
3.3
7
3.5
0
0
0
3.3
3.3
3.3
40
20
3.3
0
3.3
0
0
0
8
4
0
0
3.3
0
0
0
41
20.5
3.3
0
3.3
0
0
3.3
9
4.5
0
0
3.3
0
0
3.3
42
21
3.3
0
3.3
0
3.3
0
10
5
0
0
3.3
0
3.3
0
43
21.5
3.3
0
3.3
0
3.3
3.3
11
5.5
0
0
3.3
0
3.3
3.3
44
22
3.3
0
3.3
3.3
0
0
12
6
0
0
3.3
3.3
0
0
45
22.5
3.3
0
3.3
3.3
0
3.3
13
6.5
0
0
3.3
3.3
0
3.3
46
23
3.3
0
3.3
3.3
3.3
0
14
7
0
0
3.3
3.3
3.3
0
47
23.5
3.3
0
3.3
3.3
3.3
3.3
15
7.5
0
0
3.3
3.3
3.3
3.3
48
24
3.3
3.3
0
0
0
0
16
8
0
3.3
0
0
0
0
49
24.5
3.3
3.3
0
0
0
3.3
17
8.5
0
3.3
0
0
0
3.3
50
25
3.3
3.3
0
0
3.3
0
18
9
0
3.3
0
0
3.3
0
51
25.5
3.3
3.3
0
0
3.3
3.3
19
9.5
0
3.3
0
0
3.3
3.3
52
26
3.3
3.3
0
3.3
0
0
20
10
0
3.3
0
3.3
0
0
53
26.5
3.3
3.3
0
3.3
0
3.3
21
10.5
0
3.3
0
3.3
0
3.3
54
27
3.3
3.3
0
3.3
3.3
0
22
11
0
3.3
0
3.3
3.3
0
55
27.5
3.3
3.3
0
3.3
3.3
3.3
23
11.5
0
3.3
0
3.3
3.3
3.3
56
28
3.3
3.3
3.3
0
0
0
24
12
0
3.3
3.3
0
0
0
57
28.5
3.3
3.3
3.3
0
0
3.3
25
12.5
0
3.3
3.3
0
0
3.3
58
29
3.3
3.3
3.3
0
3.3
0
26
13
0
3.3
3.3
0
3.3
0
59
29.5
3.3
3.3
3.3
0
3.3
3.3
27
13.5
0
3.3
3.3
0
3.3
3.3
60
30
3.3
3.3
3.3
3.3
0
0
28
14
0
3.3
3.3
3.3
0
0
61
30.5
3.3
3.3
3.3
3.3
0
3.3
29
14.5
0
3.3
3.3
3.3
0
3.3
62
31
3.3
3.3
3.3
3.3
3.3
0
30
15
0
3.3
3.3
3.3
3.3
0
63
31.5
3.3
3.3
3.3
3.3
3.3
3.3
31
15.5
0
3.3
3.3
3.3
3.3
3.3
32
16
3.3
0
0
0
0
0
Ref. : DSCHT40121069 - 10 Mar 11
12/14
Route Départementale 128, BP46 - 91401 ORSAY Cedex - FRANCE
Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
Specifications subject to change without notice
DC-6GHz 6-BIT DIGITAL ATTENUATOR
CHT4012-98F
Note
Ref. : DSCHT40121069 - 10 Mar 11
13/14
Route Départementale 128, BP46 - 91401 ORSAY Cedex - FRANCE
Tel.: +33 (0) 1 69 33 03 08 - Fax: +33 (0) 1 69 33 03 09
Specifications subject to change without notice
CHT4012-98F
DC-6GHz 6-BIT DIGITAL ATTENUATOR
Recommended ESD management
Refer to the application note AN0020 available at http://www.ums-gaas.com for ESD
sensitivity and handling recommendations for the UMS products.
Ordering Information
Chip form:
CHT4012-98F/00
Information furnished is believed to be accurate and reliable. However United Monolithic Semiconductors
S.A.S. assumes no responsibility for the consequences of use of such information nor for any infringement of
patents or other rights of third parties which may result from its use. No license is granted by implication or
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Monolithic Semiconductors S.A.S.
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