HMC629LP4 Datasheet, PDF (4/8 Pages) Hittite Microwave Corporation – 3 dB LSB GaAs MMIC 4-BIT DIGITAL ATTENUATOR, DC - 6 GHz

HMC629LP4 / 629LP4E
v07.0410
3 dB LSB GaAs MMIC 4-BIT
DIGITAL ATTENUATOR, DC - 6 GHz
Parameter
Typ.
Min. serial period, t_SCK
Control set-up time, t_CS
Control hold-time, t_CH
LE setup-time, t_LN
Min. LE pulse width, t_LEW
Min LE pulse spacing, t_LES
Serial clock hold-time from LE, t_CKN
Hold Time, t_PH.
Latch Enable Minimum Width, t_LEN
Setup Time, t_PS
100 ns
20 ns
20 ns
10 ns
10 ns
630 ns
10 ns
0 ns
10 ns
2 ns
Timing Diagram (Latched Parallel Mode)
Parallel Mode (Direct Parallel Mode & Latched Parallel Mode)
Note: The parallel mode is enabled when P/S is set to low.
Direct Parallel Mode - The attenuation state is changed by the Control Voltage Inputs directly. The LE (Latch Enable)
must be at a logic high to control the attenuator in this manner.
Latched Parallel Mode - The attenuation state is selected using the Control Voltage Inputs and set while the LE is in
the Low state. The attenuator will not change state while LE is Low. Once all Control Voltage Inputs are at the desired
states the LE is pulsed. See timing diagram below for reference.
Power-Up States
If LE is set to logic LOW at power-up, the logic state of
PUP1 and PUP2 determines the power-up state of the
part per PUP truth table. If the LE is set to logic HIGH
at power-up, the logic state of D3-D0 determines
the power-up state of the part per truth table. The
attenuator latches in the desired power-up state
approximately 200 ms after power-up.
Power-On Sequence
The ideal power-up sequence is: GND, Vdd, digital
inputs, RF inputs. The relative order of the digital
inputs are not important as long as they are powered
after Vdd / GND
Bias Voltage
Vdd (Vdc)
5
Control Voltage Table
Idd (Typ.) (mA)
2.0
State
Low
High
Vdd = +3V
0 to 0.5V @ <1 µA
2 to 3V @ <1 µA
Vdd = +5V
0 to 0.8V @ <1 µA
2 to 5V @ <1 µA
PUP Truth Table
LE
PUP1
PUP2
Attenuation State
0
0
0
45 dB
0
1
0
45 dB
0
0
1
45 dB
0
1
1
Insertion Loss
1
X
X
0 to 45 dB
Note: Power-Up with LE= 1 provides direct parallel operation with
D0 - D3.
Truth Table
Control Voltage Input
D3
D2
D1
D0
Attenuation State
High High High High
Reference
I.L.
High
High
High
Low
3 dB
High
High
Low
High
6 dB
High
Low
High
High
12 dB
Low
High
High
High
24 dB
Any combination of the above states will provide an attenuation
approximately equal to the sum of the bits selected.
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: [phone] Fax: [phone] Order On-line at www.hittite.com
Application Support: Phone: [phone] or [e-mail]
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