参数资料
| 型号： | NB6L239MNEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 3/6页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL BBG NB6L239MND |
| 设计资源： | NB6L239MNEVB Gerber Files |
| 标准包装： | 1 |
| 系列： | * |
NB6L239MNEVB
SMAGND V EE /GND
MR
SELA0 SELA1
V CC
Digital Oscilloscope
or Frequency Counter
Signal Generator
QA
OUT
OUT
CLK
CLK
V BBAC
QA
QB
QB
50 W
50 W
50 W
50 W
Trigger Out
Trigger
EN
SELB0
SELB1
50 W
Figure 3. Evaluation Board
Board Layout
The evaluation board is constructed with Rogers material
with 50 W trace impedances designed to minimize noise,
achieve high bandwidth and minimize crosstalk.
Layer Stack
L1 Signal (top) (Rogers)
L2 SMA Ground
L3 V CC and V EE (positive and negative power supply)
L4 Signal (bottom)
Control and Select Pins
The Control / Select pins, MR, SELXn and EN, can be
accessed via the appropriate SMA connector. These pins can
also be manually controlled by using the H/L switch. When
using the switch, the SMA connector should be left open.
When using the SMA connector, the switch must be in the
“OPEN” position.
The SELXn and EN device pins have internal pulldown
resistors. The NB6L239 evaluation board was designed to
take advantage of this attribute. When the SELXn and EN
switch is in the logic LOW position, the input pin “floats” to
a logic LOW owing to the pulldown resistor; a logic LOW
voltage is not forced on the pin. In the HIGH position, the
switch forces the SELXn and EN pin to the positive power
supply rail , a logic HIGH.
The MR device pin has an internal pullup resistor. When
the MR switch is in the logic HIGH position, the input pin
“floats” to a logic HIGH owing to the pullup resistor; a logic
HIGH voltage is not forced on the pin. In the LOW position,
the switch forces the MR pin to the negative power supply
rail, a logic LOW.
V BB = V BBAC
V BB labeled on the board is actually V BBAC per the data
sheet.
V T
The V T pin can be set to V CC , V EE (239) GND (239S),
V BB or SMAGND by using a jumper.
V EE / GND
V EE is the negative supply for the NB6L239. GND is the
negative supply for NB6N239S.
http://onsemi.com
3
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