Providing a cost reduction and a small-footprint due to miniaturization of balanced signal SW

July 16, 2009

New Japan Radio releases the NJG1663K44, X-SP4T Switch for balanced signals

July 16, 2009 - New Japan Radio Co., Ltd. has introduced to the market, the NJG1663K44, X-SP4T *1 Switch for balanced signals *2, which is suitable for switch of balance signal using in a cellular phone and data communication card.

[Background of development]

In a receiving circuits block for a cellular phone, received signals past through antenna are shifted to balanced signals in switching of balanced dual band filter *3 and output and handled in RF-IC *4.

The balanced signals from switching of balanced dual band filter are output at a pair of signal lines, so a switch for the balanced signals which is ease to switch four pairs of signal lines are required in case of terminals with 4-bands. And so, New Japan Radio Co., Ltd developed NJG1663K44 to be ease to switch the balanced signals.

[Features]

The NJG1663K44 consists of 2 circuits of SP4T switches and logic circuits, and synchronizes 2 circuits of built-in SP4T by a logic circuit and makes the 4 lines of balanced signal switched.

NJG1663K44

1.Providing the alleviation of burdens for PCB design due to X-Style switch
The NJG1663K44 contributes the alleviation of burdens for PCB design due to X-Style *5 switch, which makes external signal lines not cross on a PCB (Printed Circuit Board).
The NJG1663K44 adopts EQFN16-44, small and thin package. Compared with the size using two existed SP4T switches (NJG11519KC1), the NJG1663K44 is around 69% of smaller in surface ratio and around 40% of lower in height ration and realizes small-footprint of PCB.
2.Low phase error between balanced signals within ±5deg
No external phase compensation is required due to a feature of low phase error between balanced signals within ±5deg.

[Others]

Notes
*1 :X-SP4T
New Japan Radio Co., Ltd. regards the balanced signals switch as [X-Switch].Means cross single pole four throw.
*2 :Balanced signals
Mean differential, which is used a pair of signal lines for data transmission and the signals are showed by a potential difference between the signal lines. The balanced signals are not influence by ground level and have high common mode rejection ration compared with the unbalanced signals.
*3 :Balanced dual band filter
Filter combined band pass filter and balun (Balanced to Unbalanced Transformer).
*4 :RF-IC
Radio Frequency Transceiver Integrated Circuits.
*5 :X-Style
Style that crosses the signal inside of IC and not outside of IC (on a PCB).

[Products List]

Product Name NJG1663K44
Function X(Cross)-SP4T Switch for balanced signals
Applications Cellular phone, Data Communication Card
Packaging QFN16-44
NJG1663K44

[Features & Characteristics]

[Schedule]

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