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参数资料
| 型号： | E5551A-DOW |
| 英文描述： | Transponder |
| 中文描述： | 转发 |
| 文件页数： | 15/21页 |
| 文件大小： | 157K |
| 代理商： | E5551A-DOW |
e5551
Rev. A2, 19-Apr-00
3 (21)
Coil 1
Coil 2
Modulator
Analog
front
end
POR
Input register
Write
decoder
Bitrate
generator
Memory
(264 bit EEPROM)
Controller
Test logic
Mode register
HV generator
V
Test pads
DD
VSS
Figure 4. Block diagram e5551
Power-On Reset (POR)
The power-on reset is a delay reset which is triggered
when supply voltage is applied.
Mode Register
The mode register stores the mode data from EEPROM
block 0. It is continually refreshed at the start of every
block. This increases the reliability of the device (if the
originally loaded mode information is false, it will be
corrected by subsequent refresh cycles).
Modulator
The modulator consists of several data encoders in two
stages, which may be freely combined to obtain the
desired modulation. The basic types of modulation are:
D PSK: phase shift: 1) every change; 2) every ‘1’;
3) every rising edge (carrier: fc/2, fc/4 or fc/8)
D FSK: 1) f1 = rf/8 f2 = rf/5; 2) f1 = rf/8, f2 = rf/10
D Manchester: rising edge = H; falling edge = L
D Biphase: every bit creates a change, a data ‘H’ creates
an additional mid-bit change
Note: The following modulation type combinations will
not work:
D Stage1 Manchester or Biphase, stage2 PSK2, at any
PSK carrier frequency (because the first stage output
frequency is higher than the second stage strobe
frequency)
D Stage1 Manchester or Biphase and stage2 PSK with
bitrate = rf/8 and PSK carrier frequency = rf/8 (for the
same reason as above)
D Any stage1 option with any PSK for bitrates rf/50 or
rf/100 if the PSK carrier frequency is not an integer
multiple of the bitrate (e.g., br = rf/50, PSKcf = rf/4,
because 50/4 = 12.5). This is because the PSK carrier
frequency must maintain constant phase with respect
to the bit clock.
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